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• MySQL Check and compare and if necessary create data.

  - by user2979677

  Hello I have three different tables Talk ID type_id YEAR NUM NUM_LETTER DATE series_id TALK speaker_id SCRIPREF DONE DOUBLE_SID DOUBLE_TYP LOCAL_CODE MISSING RESTRICTED WHY_RESTRI SR_S_1 SR_E_1 BCV_1 SR_S_2 SR_E_2 BCV_2 SR_S_3 SR_E_3 BCV_3 SR_S_4 SR_E_4 BCV_4 QTY_IV organisation_id recommended topic_id thumbnail mp3_file_size duration version Product_component id product_id talk_id position version Product id created product_type_id last_modified last_modified_by num_sold current_stock min_stock max_stock comment organisation_id series_id name subscription_type_id recipient_id discount_start discount_amount discount_desc discount_finish discount_percent voucher_amount audio_points talk_id price_override product_desc instant_download_status_id downloads instant_downloads promote_start promote_finish promote_desc restricted from_tape discontinued discontinued_reason discontinued_date external_url version I want to create a procedure that will check if select the id from talk and compare it with the id of product to see if there is a product id in the table and if there isn't then create it however my problem is that my tables talk and product can't talk, as id in talk is related to talk_id in product_component and id in product is related to product_id in product_component. Are there any ways for this to be done? I tried this, CREATE DEFINER=`sthelensmedia`@`localhost` PROCEDURE `CreateSingleCDProducts`() BEGIN DECLARE t_id INT; DECLARE t_restricted BOOLEAN; DECLARE t_talk CHAR(255); DECLARE t_series_id INT; DECLARE p_id INT; DECLARE done INT DEFAULT 0; DECLARE cur1 CURSOR FOR SELECT id,restricted,talk,series_id FROM talk WHERE organisation_id=2; DECLARE CONTINUE HANDLER FOR NOT FOUND SET done=1; UPDATE product SET restricted=TRUE WHERE product_type_id=3; OPEN cur1; create_loop: LOOP FETCH cur1 INTO t_id, t_restricted, t_talk, t_series_id; IF done=1 THEN LEAVE create_loop; END IF; INSERT INTO product (created,product_type_id,last_modified,organisation_id,series_id,name,restricted) VALUES (NOW(),3,NOW(),2,t_series_id,t_talk,t_restricted); SELECT LAST_INSERT_ID() INTO p_id; INSERT INTO product_component (product_id,talk_id,position) VALUES (p_id,t_id,0); END LOOP create_loop; CLOSE cur1; END Just wondering if anyone could help me.

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• I’m screwing up this LEFT JOIN

  - by Jason Shultz

  I'm doing a left join on several tables. What I want to happen is that it list all the businesses. Then, it looks through the photos, videos, specials and categories. IF there are photos, then the tables shows yes, if there are videos, it shows yes in the table. It does all that without any problems. Except for one thing. For every photo, it shows the business that many times. For example, if there are 5 photos in the DB for a business, it shows the business five times. Obviously, this is not what I want to happen. Can you help? function frontPageList() { $this->db->select('b.id, b.busname, b.busowner, b.webaddress, p.thumb, v.title, c.catname'); $this->db->from ('business AS b'); $this->db->where('b.featured', '1'); $this->db->join('photos AS p', 'p.busid = b.id', 'left'); $this->db->join('video AS v', 'v.busid = b.id', 'left'); $this->db->join('specials AS s', 's.busid = b.id', 'left'); $this->db->join('category As c', 'b.category = c.id', 'left'); return $this->db->get();

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• # how to split the column values using stored procedure

  - by user1444281

  I have two tables table 1 is SELECT * FROM dbo.TBL_WD_WEB_DECK WD_ID WD_TITLE ------------------ 1 2 and data in 2nd table is WS_ID WS_WEBPAGE_ID WS_SPONSORS_ID WS_STATUS ----------------------------------------------------- 1 1 1,2,3,4 Y I wrote the following stored procedure to insert the data into both the tables catching the identity of main table dbo.TBL_WD_WEB_DECK. WD_ID is related with WS_WEBPAGE_ID. I wrote the cursor in update action to split the WS_SPONSORS_ID column calling the split function in the cursor. But it is not working. The stored procedure is: ALTER procedure [dbo].[SP_Example_SPLIT] ( @action char(1), @wd_id int out, @wd_title varchar(50), @ws_webpage_id int, @ws_sponsors_id varchar(250), @ws_status char(1) ) as begin set nocount on IF (@action = 'A') BEGIN INSERT INTO dbo.TBL_WD_WEB_DECK(WD_TITLE)VALUES(@WD_TITLE) DECLARE @X INT SET @X = @@IDENTITY INSERT INTO dbo.TBL_WD_SPONSORS(WS_WEBPAGE_ID,WS_SPONSORS_ID,WS_STATUS) VALUES (@ws_webpage_id,@ws_sponsors_id,@ws_status) END ELSE IF (@action = 'U') BEGIN UPDATE dbo.TBL_WD_WEB_DECK SET WD_TITLE = @wd_title WHERE WD_ID = @WD_ID UPDATE dbo.TBL_WD_SPONSORS SET WS_STATUS = 'N' where WS_SPONSORS_ID not in (@ws_sponsors_id) and ws_webpage_id = @wd_id BEGIN /* Declaring Cursor to split the value in ws_sponsors_id column */ Declare @var int Declare splt cursor for /* used the split function and calling the parameter in that split function */ select * from iter_simple_intlist_to_tbl(@WS_SPONSORS_ID) OPEN splt FETCH NEXT FROM splt INTO @var WHILE (@@FETCH_STATUS = 0) begin if not exists(select * from dbo.TBL_WD_SPONSORS where WS_WEBPAGE_ID = @wd_id and WS_SPONSORS_ID = @var) begin insert into dbo.TBL_WD_SPONSORS (WS_WEBPAGE_ID,WS_SPONSORS_ID) values(@wd_id,@var) end end CLOSE SPONSOR DEALLOCATE SPONSOR END END END The result I want is if I insert the data in WD_ID and IN WS_SPONSORS_ID column the data in the WS_SPONSORS_ID column should split and I need to compare it with WD_ID. The result I need is: WD_ID WD_TITLE --------------------- 1 TEST 2 TEST1 3 WS_ID WS_WEBPAGE_ID WS_SPONSORS_ID WS_STATUS -------------------------------------------------------- 1 1 1 Y 2 1 2 N 3 1 3 Y If I pass the string in WS_SPONSORS_ID as 1,2,3 it has to split like the above. Can you help?

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• What are advantages of using a one-to-one table relationship? (MySQL)

  - by byronh

  What are advantages of using a one-to-one table relationship as opposed to simply storing all the data in one table? I understand and make use of one-to-many, many-to-one, and many-to-many all the time, but implementing a one-to-one relationship seems like a tedious and unnecessary task, especially if you use naming conventions for relating (php) objects to database tables. I couldn't find anything on the net or on this site that could supply a good real-world example of a one-to-one relationship. At first I thought it might be logical to separate 'users', for example, into two tables, one containing public information like an 'about me' for profile pages and one containing private information such as login/password, etc. But why go through all the trouble of using unnecessary JOINS when you can just choose which fields to select from that table anyway? If I'm displaying the user's profile page, obviously I would only SELECT id,username,email,aboutme etc. and not the fields containing their private info. Anyone care to enlighten me with some real-world examples of one-to-one relationships?

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• How to automatically remove Flash history/privacy trail? Or stop Flash from storing it?

  - by Arjan van Bentem

  Many people have heard about third-party cookies, and some browsers even block those by default. Some people may even be using Private Browsing modes. However, only few seem to realise that Adobe's Flash player also leaves a cross-browser trail on your local hard drive, and allows for sending cookie-like information back to the server, including third-party sites. And because it is a plugin, Flash does not take any of the browser's privacy settings into account. Sorry for the long post, but first some details about why using Flash raises a privacy concern, followed by the results of my tests: The Flash player keeps a cross-browser history of the domain names of the Flash-sites your computer has visited. Unlike your browser's history, this history is not limited to a certain number of days. History is also recorded while using so-called Private Browsing modes. It is stored on your hard drive (though, as described below, without going to Adobe's site you won't know what is stored). I am not sure if any date and time information is kept about each visit, but to see the domain names: right-click on some Flash content, open the settings dialog, and click the Help icon or click the Advanced button within the Privacy tab. This opens a browser to the help pages on Adobe.com, where one can click through to the Website Storage Settings panel. One can clear the existing list, but one cannot stop it from being recorded again. Flash allows for storing data on your local hard drive, using so-called Local Shared Objects (aka "Flash Cookies"). Just like HTTP cookies, this data can be sent back to the server, for tracking purposes. They are cross-browser, have no expiration date, and no user defined maximum lifetime can be set in the Flash preferences either. These not being HTTP cookies, they are (of course) not blocked by a browser's cookies preferences and are not removed when the normal HTTP cookies are deleted. Adobe has announced that version 10.1 will obey Private Browsing in most popular browsers, but unfortunately no word about also removing the data whenever normal cookies are deleted manually. And its implementation might be confusing: [..] if the browser is in normal browsing mode when the Flash Player instance is created, then that particular instance will forever be in normal browsing mode (private browsing is turned off). Accordingly, toggling private browsing on or off without refreshing the page or closing the private browsing window will not impact Flash Player. Local Shared Objects are not limited to the site you visit, and third-party storage is enabled by default. At the Global Storage Settings panel one can deselect the default Allow third-party Flash content to store data on your computer. Because of the cross-browser and expiration-less nature (and the fact that few people know about it), I feel that the cross-browser third-party Flash Cookies are more dangerous for visitor tracking than third-party normal HTTP cookies. They are even used to restore plain HTTP cookies that the user tried to delete: "All advertisers, websites and networks use cookies for targeted advertising, but cookies are under attack. According to current research they are being erased by 40% of users creating serious problems," says Mookie Tenembaum, founder of United Virtualities. "From simple frequency capping to the more sophisticated behavioral targeting, cookies are an essential part of any online ad campaign. PIE ["Persistent Identification Element"] will give publishers and third-party providers a persistent backup to cookies effectively rendering them unassailable", adds Tenembaum. [..] To justify this tracking mechanism, UV's Tenembaum said, "The user is not proficient enough in technology to know if the cookie is good or bad, or how it works." When selecting None (zero KB) for Specify the amount of disk space that website websites that you haven't yet visited can use to store information on your computer, and checking Never ask again then some sites do not work. However, the same site might work when setting it to None but without selecting Never ask again, and then choose Deny whenever prompted. Both options would result in zero KB of data being allowed, but the behaviour differs. The plugin also provides a Flash Player cache for Adobe-signed files. I guess these files are not an issue. So: how to automatically delete that information? On a Mac, one can find a settings.sol file and a folder for each visited Flash-website in: $HOME/Library/Preferences/Macromedia/Flash Player/macromedia.com/support/flashplayer/sys/ Deleting the settings.sol file and all the folders in sys, removes the trail from the settings panels. However, the actual Local Shared Ojects are elsewhere (see Wikipedia for locations on other operating systems), in a randomly named subfolder of: $HOME/Library/Preferences/Macromedia/Flash Player/#SharedObjects But then: how to remove this automatically? Simply removing the folders and the settings.sol file every now and then (like by using launchd or Windows' Task Scheduler) may interfere with active browsers. Or is it safe to assume that, given the cross-browser nature, the plugin would not care if things are removed while it is active? Only clearing during log-off may not work for those who hibernate all the time. Firefox users can install BetterPrivacy or Objection to delete the Local Shared Objects (for all others browsers as well). I don't know if that also deletes the trail of website domain names. Or: how to stop Flash from storing a history trail? Change of plans: I'm currently testing prohibiting Flash to write to its own sys and #SharedObjects folders. So far, Flash has not tried to restore permissions (though, when deleting the folders, Flash will of course recreate them). I've not encountered any problems but this may take some while to validate, using multiple browsers and sites. I've not yet found a log that reports errors. On a Mac: cd "$HOME/Library/Preferences/Macromedia/Flash Player/macromedia.com/support/flashplayer" rm -r sys/* chmod u-w sys cd "$HOME/Library/Preferences/Macromedia/Flash Player" # preserve the randomly named subfolders (only preserving the latest would suffice; see below) rm -r \#SharedObjects/*/* chmod -R u-w \#SharedObjects I guess the above chmods cannot be achieved on an old Windows system (I'm not sure about XP and Vista?). Though maybe on Windows one could replace the folders sys and #SharedObjects with dummy files with the same names? Anyone? Obviously, keeping Flash from storing those Local Shared Objects for all sites may cause problems. Some test results (Flash 10 on Mac OS X): When blocking the sys folder (even when leaving the #SharedObjects folder writable) then YouTube won't remember your volume settings while viewing multiple videos. Temporarily allowing write access to the blocked folders while visiting trusted sites (to only create folders for domains you like, maybe including references in settings.sol) solves that. This way, for YouTube, Flash could be allowed to write to sys/#s.ytimg.com and #SharedObjects/s.ytimg.com, while Flash could not create new folders for other domains. One may also need to make settings.sol read-only afterwards, or delete it again. When blocking both the sys and #SharedObjects folders, YouTube and Vimeo work fine (though they might not remember any settings). However, Bits on the Run refuses to even show the video player. This is solved by temporarily unblocking the #SharedObjects folder, to allow Flash to create a subfolder with some random name. Within this folder, it would create yet another folder for the current Flash website (content.bitsontherun.com). Removing that website-specific folder, and blocking both #SharedObjects and the randomly named subfolder, still seems to allow Bits on the Run to operate, even though it still cannot write anything to disk. So: the existence of the randomly named subfolder (even when write protected) is important for some sites. When I first found the #SharedObjects folder, it held many subfolders with random names, some created on the very same day. I wonder when Flash decides it wants a new folder, and how it determines (and remembers) that random name. For a moment I considered not blocking write access for sys and #SharedObjects, but explicitly creating read-only folders for well-known third-party tracking domains (like based on a list from, for example, AdBlock Plus). That way, any other domain could still create Local Shared Objects. But the list would be long, and the domains from AdBlock Plus are probably all third-party domains anyway, so disabling Allow third-party Flash content to store data on your computer might have the very same result. Any experience anyone? (Final notes: if the above links to the settings panels do not work in the future, then use the URL that is known to Flash player as a starting point: www.adobe.com/go/settingsmanager. See also "You Deleted Your Cookies? Think Again" at Wired.com -- which uses Flash cookies itself as well... For the very suspicious using Time Machine: you may want to exclude both folders, for each user, and remove the trace that is already on your backup.)

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• Unicenter Software Delivery 4 not able to connect to MS SQL 2000 Database after W2003 SP2 upgrade

  - by grub

  Hello Everyone Yesterday I installed the Windows Server 2003 Service Pack 2 on a Windows Server 2003 which has Unicenter Software Delivery 4 installed. Prior to the installation I disabled every CA service on the server (Brightstor, SDO , RCO, TNG) and the MS SQL 2000 service. After the installation of the SP2 I enabled the services again but the Unicenter Service is not able to connect to the MS SQL 2000 Database anymore. The database itself is up and running and I can connect to it with the Enterprise Manager. A dbcc checkdb doesnt return any errors on the Unicenter database. The Unicenter service throws the following error messages during startup: IM[1] 27/05 10:38:31,272 Installation Manager in init phase IM[1] 27/05 10:38:31,694 Process IM(L) - [004152] failed to open database SDDATA. dbopen() call failed. IM[1] 27/05 10:38:31,694 sqls error details: IM[1] 27/05 10:38:31,694 (null) IM[1] 27/05 10:38:32,069 ##EXCEPTION## TableError T@:PS_SQLS\isam_db.cxx:744. IM[1] 27/05 10:38:32,069 ##EXCEPTION## TableError C@:TaskmgrL\ASMTML.CXX:596. IM[1] 27/05 10:38:32,069 ##EXCEPTION## ErrorCode: 4711 in SDDATA:Isam::Isam. Process IM(L) - [004152] failed to open database SDDATA. dbopen() call failed. IM[1] 27/05 10:38:32,069 sqls error details: IM[1] 27/05 10:38:32,069 (null) IM[1] 27/05 10:38:32,069 returned 0. IM[1] 27/05 10:38:32,084 Persistent Storage could not be opened. Error cause is found in the ASM Event Log. Restart Task Manager. IM[1] 27/05 10:38:32,084 Failed to open database. IM[1] 27/05 10:38:32,084 Installation Manager ends> If I check the Unicenter configutation with *chkmib_l* the tool throws an exception and creates a small dump file. An Exception Occurred: Time: 27/05 09:49:38,928 Reason: ChkMIB_l.exe caused an UNKNOWN_EXCEPTION in module kernel32.dll at 7C82001B:77E4BEE7 Registers: EAX=0012F908 EBX=00000000 ECX=00000000 EDX=02410004 ESI=0012F998 EDI=0012F998 EBP=0012F958 ESP=0012F904 EIP=77E4BEE7 FLG=00000206 CS =7C82001B DS =B90023 SS =120023 ES =120023 FS =7C82003B GS =3F0000 Call Stack: 7C82001B:77E4BEE7 (0xE06D7363 0x00000001 0x00000003 0x0012F98C) kernel32.dll 7C82001B:77BB3259 (0x0012F9B8 0x2B017C50 0x2B024404 0x00B68C98) MSVCRT.dll 7C82001B:2B010C42 (0x00020003 0x010C00FE 0x003F0190 0x00B69050) PS.dll << SOFTWARE DELIVERY INSTANCE INFO >> TRIGGER 0(1) instances: JCE 0(1) instances: TM 0(1) instances: IM 0(1) instances: DM 0(1) instances: DPU 0(71) instances: NATF 0(1) instances: MIBCONV 0(0) instances: API 0(4) instances: DTSFT 0(0) instances: TNGPOP 0(0) instances: DGATE 0(0) instances: << FLUSHING MEMORY TRACES >> << STOP FLUSHING MEMORY TRACES >> I compared the configuration of the SDO service and the system configuration with another server on which the Windows Server 2003 SP2 is installed and SDO is working. The configuration is the same and the same driver and software versions are used. Do you have any idea what causes the connection issue? Should I deinstall the unicenter service and make a fresh installation on the server or should I remove the Windows Server 2003 SP2? I don't want to remove the SP2 because it's a requirement for WSUS3 SP2 and I really don't want to know how many possible exploits are possible in such an old system ;-) Thank you very much and have a nice day. Below you can find more detailed information about the system and the SDO service. psinfo output (system information) System information for \\CZZAAS1003: Uptime: 0 days 14 hours 38 minutes 50 seconds Kernel version: Microsoft Windows Server 2003, Multiprocessor Free Product type: Standard Edition Product version: 5.2 Service pack: 2 Kernel build number: 3790 Install date: 23.9.2004, 11:16:11s IE version: 6.0000 System root: C:\WINDOWS Processors: 2 Processor speed: 2.3 GHz Processor type: Intel(R) Xeon(TM) CPU Physical memory: 1024 MB Video driver: RAGE XL PCI Family (Microsoft Corporation) sdver output (Unicenter Software delivery version) Unicenter Software Delivery 4.0 SP1 I2 ENU [2901] Copyright 2004 Computer Associates International, Incorporated ms sql 2000 version and odbc driver version MS SQL 2000 Server Standard Edition Product Version: 8.00.760 (SP3) ODBC Driver: SQL Server - Version 2000.86.3959.00 complete Unicenter Software delivery service log file TRIGGER[1] 27/05 10:38:28,366 SD Trigger Agent has started NATF[1] 27/05 10:38:28,928 Initiation phase finished IM[1] 27/05 10:38:31,272 Installation Manager in init phase IM[1] 27/05 10:38:31,694 Process IM(L) - [004152] failed to open database SDDATA. dbopen() call failed. IM[1] 27/05 10:38:31,694 sqls error details: IM[1] 27/05 10:38:31,694 (null) IM[1] 27/05 10:38:32,069 ##EXCEPTION## TableError T@:PS_SQLS\isam_db.cxx:744. IM[1] 27/05 10:38:32,069 ##EXCEPTION## TableError C@:TaskmgrL\ASMTML.CXX:596. IM[1] 27/05 10:38:32,069 ##EXCEPTION## ErrorCode: 4711 in SDDATA:Isam::Isam. Process IM(L) - [004152] failed to open database SDDATA. dbopen() call failed. IM[1] 27/05 10:38:32,069 sqls error details: IM[1] 27/05 10:38:32,069 (null) IM[1] 27/05 10:38:32,069 returned 0. IM[1] 27/05 10:38:32,084 Persistent Storage could not be opened. Error cause is found in the ASM Event Log. Restart Task Manager. IM[1] 27/05 10:38:32,084 Failed to open database. IM[1] 27/05 10:38:32,084 Installation Manager ends TM[1] 27/05 10:38:32,116 Task Manager in init phase TM[1] 27/05 10:38:32,334 Process TM(L) - [006132] failed to open database SDDATA. dbopen() call failed. TM[1] 27/05 10:38:32,334 sqls error details: TM[1] 27/05 10:38:32,334 (null) TM[1] 27/05 10:38:32,381 ##EXCEPTION## TableError T@:PS_SQLS\isam_db.cxx:744. TM[1] 27/05 10:38:32,381 ##EXCEPTION## TableError C@:TaskmgrL\ASMTML.CXX:596. TM[1] 27/05 10:38:32,381 ##EXCEPTION## ErrorCode: 4711 in SDDATA:Isam::Isam. Process TM(L) - [006132] failed to open database SDDATA. dbopen() call failed. TM[1] 27/05 10:38:32,381 sqls error details: TM[1] 27/05 10:38:32,381 (null) TM[1] 27/05 10:38:32,381 returned 0. TM[1] 27/05 10:38:32,381 Persistent Storage could not be opened. Error cause is found in the ASM Event Log. Restart Task Manager. TM[1] 27/05 10:38:32,381 Failed to open database. TM[1] 27/05 10:38:32,381 Task Manager ends DM[1] 27/05 10:38:33,272 Dialogue Manager is now active API[1] 27/05 10:38:34,397 API Server Process in init phase API[1] 27/05 10:38:34,397 API - SDNLS_Init API[1] 27/05 10:38:34,397 API - connectEM API[1] 27/05 10:38:34,412 API - apiServ.init DM[1] 27/05 10:38:34,678 **AND** 1 Agents triggered API[1] 27/05 10:38:34,709 Process API(L) - [005680] failed to open database SDDATA. dbopen() call failed. API[1] 27/05 10:38:34,709 sqls error details: API[1] 27/05 10:38:34,709 (null) API[1] 27/05 10:38:34,756 ##EXCEPTION## TableError T@:PS_SQLS\isam_db.cxx:744. API[1] 27/05 10:38:34,756 ##EXCEPTION## TableError C@:MainAPIL\APISERVL.CXX:246. API[1] 27/05 10:38:34,756 ##EXCEPTION## ErrorCode: 4711 in SDDATA:Isam::Isam. Process API(L) - [005680] failed to open database SDDATA. dbopen() call failed. API[1] 27/05 10:38:34,756 sqls error details: API[1] 27/05 10:38:34,756 (null) API[1] 27/05 10:38:34,756 returned 0. API[1] 27/05 10:38:34,756 Open of the database failed. API[1] 27/05 10:38:34,756 API - apiServ.init complete API[1] 27/05 10:38:34,756 API - start_APIServer DM[1] 27/05 10:38:34,803 CZZAAR1037 DPU[1:CZZAAR1037] 27/05 10:38:35,772 DPU in init phase DPU[1:CZZAAR1037] 27/05 10:38:36,100 >> GetManagerData DPU[1:CZZAAR1037] 27/05 10:38:36,287 >> SetCompInfo DPU[1:CZZAAR1037] 27/05 10:38:36,334 >> GetContainerList DPU[1:CZZAAR1037] 27/05 10:38:36,350 getJobState 3 from 5b6ad DPU[1:CZZAAR1037] 27/05 10:38:36,350 getJobState 3 from 5b6ad DPU[1:CZZAAR1037] 27/05 10:38:36,350 getJobState 3 from 5b6b7 DPU[1:CZZAAR1037] 27/05 10:38:36,350 getJobState 3 from 5b6b7 DPU[1:CZZAAR1037] 27/05 10:38:36,350 getJobState 3 from 5b6c1 DPU[1:CZZAAR1037] 27/05 10:38:36,350 getJobState 3 from 5b6c1 DPU[1:CZZAAR1037] 27/05 10:38:36,366 getJobState 3 from 5b6cb DPU[1:CZZAAR1037] 27/05 10:38:36,366 getJobState 3 from 5b6cb DPU[1:CZZAAR1037] 27/05 10:38:36,366 getJobState 3 from 5b6f9 DPU[1:CZZAAR1037] 27/05 10:38:36,366 getJobState 3 from 5b6f9 DPU[1:CZZAAR1037] 27/05 10:38:36,366 getJobState 3 from 5b71a DPU[1:CZZAAR1037] 27/05 10:38:36,366 getJobState 3 from 5b71a DPU[1:CZZAAR1037] 27/05 10:38:36,366 getJobState 3 from 5b724 DPU[1:CZZAAR1037] 27/05 10:38:36,381 getJobState 3 from 5b724 DPU[1:CZZAAR1037] 27/05 10:38:36,397 getJobState 3 from 5b72e DPU[1:CZZAAR1037] 27/05 10:38:36,397 getJobState 3 from 5b72e DPU[1:CZZAAR1037] 27/05 10:38:36,397 getJobState 3 from 5b738 DPU[1:CZZAAR1037] 27/05 10:38:36,397 getJobState 3 from 5b738 DPU[1:CZZAAR1037] 27/05 10:38:36,397 getJobState 3 from 5b742 DPU[1:CZZAAR1037] 27/05 10:38:36,397 getJobState 3 from 5b742 DPU[1:CZZAAR1037] 27/05 10:38:36,397 getJobState 3 from 5b74c DPU[1:CZZAAR1037] 27/05 10:38:36,397 getJobState 3 from 5b74c DPU[1:CZZAAR1037] 27/05 10:38:36,397 getJobState 3 from 5b756 DPU[1:CZZAAR1037] 27/05 10:38:36,397 getJobState 3 from 5b756 DPU[1:CZZAAR1037] 27/05 10:38:36,397 getJobState 3 from 5b78a DPU[1:CZZAAR1037] 27/05 10:38:36,397 getJobState 3 from 5b78a DPU[1:CZZAAR1037] 27/05 10:38:36,397 getJobState 3 from 5b7af DPU[1:CZZAAR1037] 27/05 10:38:36,397 getJobState 3 from 5b7af DPU[1:CZZAAR1037] 27/05 10:38:36,522 >> SetCompAttr DPU[1:CZZAAR1037] 27/05 10:38:36,569 >> SetDetected DPU[1:CZZAAR1037] 27/05 10:38:36,584 disconnect DPU[1:CZZAAR1037] 27/05 10:38:36,584 getJobState 3 from 5b6ad DPU[1:CZZAAR1037] 27/05 10:38:36,584 getJobState 3 from 5b6b7 DPU[1:CZZAAR1037] 27/05 10:38:36,584 getJobState 3 from 5b6c1 DPU[1:CZZAAR1037] 27/05 10:38:36,584 getJobState 3 from 5b6cb DPU[1:CZZAAR1037] 27/05 10:38:36,584 getJobState 3 from 5b6f9 DPU[1:CZZAAR1037] 27/05 10:38:36,584 getJobState 3 from 5b71a DPU[1:CZZAAR1037] 27/05 10:38:36,584 getJobState 3 from 5b724 DPU[1:CZZAAR1037] 27/05 10:38:36,584 getJobState 3 from 5b72e DPU[1:CZZAAR1037] 27/05 10:38:36,584 getJobState 3 from 5b738 DPU[1:CZZAAR1037] 27/05 10:38:36,584 getJobState 3 from 5b742 DPU[1:CZZAAR1037] 27/05 10:38:36,584 getJobState 3 from 5b74c DPU[1:CZZAAR1037] 27/05 10:38:36,584 getJobState 3 from 5b756 DPU[1:CZZAAR1037] 27/05 10:38:36,584 getJobState 3 from 5b78a DPU[1:CZZAAR1037] 27/05 10:38:36,584 getJobState 3 from 5b7af DPU[1:CZZAAR1037] 27/05 10:38:36,584 DPU ends DM[1] 27/05 10:38:38,006 **AND** 0 Agents triggered JCE[1] 27/05 10:38:38,053 JCE starts DM[1] 27/05 10:38:38,287 CZZAAS1003 DPU[2:CZZAAS1003] 27/05 10:38:38,412 DPU in init phase DPU[2:CZZAAS1003] 27/05 10:38:38,647 >> GetManagerData DPU[2:CZZAAS1003] 27/05 10:38:38,756 >> SetCompInfo DPU[2:CZZAAS1003] 27/05 10:38:38,787 >> GetContainerList DM[1] 27/05 10:38:38,850 **AND** 1 Agents triggered DM[1] 27/05 10:38:38,928 CZZAAR1124 DPU[3:CZZAAR1124] 27/05 10:38:39,053 DPU in init phase DPU[3:CZZAAR1124] 27/05 10:38:39,272 >> GetManagerData DM[1] 27/05 10:38:39,334 **AND** 1 Agents triggered DPU[3:CZZAAR1124] 27/05 10:38:39,381 >> SetCompInfo DPU[3:CZZAAR1124] 27/05 10:38:39,412 >> GetContainerList DM[1] 27/05 10:38:39,412 CZZAAR1125 DPU[3:CZZAAR1124] 27/05 10:38:39,428 getJobState 3 from 5b88e DPU[3:CZZAAR1124] 27/05 10:38:39,428 getJobState 3 from 5b88e DPU[2:CZZAAS1003] 27/05 10:38:39,491 >> SetCompAttr DPU[3:CZZAAR1124] 27/05 10:38:39,522 >> SetCompAttr DPU[4:CZZAAR1125] 27/05 10:38:39,522 DPU in init phase DPU[3:CZZAAR1124] 27/05 10:38:39,584 >> SetDetected DPU[2:CZZAAS1003] 27/05 10:38:39,584 >> SetDetected DPU[3:CZZAAR1124] 27/05 10:38:39,584 disconnect DPU[3:CZZAAR1124] 27/05 10:38:39,600 getJobState 3 from 5b88e DPU[3:CZZAAR1124] 27/05 10:38:39,600 DPU ends DPU[2:CZZAAS1003] 27/05 10:38:39,631 disconnect DPU[2:CZZAAS1003] 27/05 10:38:39,631 DPU ends DPU[4:CZZAAR1125] 27/05 10:38:39,756 >> GetManagerData DPU[4:CZZAAR1125] 27/05 10:38:39,850 >> SetCompInfo DPU[4:CZZAAR1125] 27/05 10:38:39,881 >> GetContainerList DPU[4:CZZAAR1125] 27/05 10:38:39,897 getJobState 3 from 5b8a9 DPU[4:CZZAAR1125] 27/05 10:38:39,897 getJobState 3 from 5b8a9 DPU[4:CZZAAR1125] 27/05 10:38:39,991 >> SetCompAttr DPU[4:CZZAAR1125] 27/05 10:38:40,100 >> SetDetected DPU[4:CZZAAR1125] 27/05 10:38:40,116 disconnect DPU[4:CZZAAR1125] 27/05 10:38:40,116 getJobState 3 from 5b8a9 DPU[4:CZZAAR1125] 27/05 10:38:40,116 DPU ends DM[1] 27/05 10:38:40,741 **AND** 0 Agents triggered JCE[1] 27/05 10:38:42,756 JCE ends DM[1] 27/05 10:38:47,475 **AND** 0 Agents triggered DM[1] 27/05 10:38:54,241 **AND** 0 Agents triggered

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• The case of the phantom ADF developer (and other yarns)

  - by Chris Muir

  A few years of ADF experience means I see common mistakes made by different developers, some I regularly make myself.  This post is designed to assist beginners to Oracle JDeveloper Application Development Framework (ADF) avoid a common ADF pitfall, the case of the phantom ADF developer [add Scooby-Doo music here]. ADF Business Components - triggers, default table values and instead of views. Oracle's JDeveloper tutorials help with the A-B-Cs of ADF development, typically built on the nice 'n safe demo schema provided by with the Oracle database such as the HR demo schema. However it's not too long until ADF beginners, having built up some confidence from learning with the tutorials and vanilla demo schemas, start building ADF Business Components based upon their own existing database schema objects.  This is where unexpected problems can sneak in. The crime Developers may encounter a surprising error at runtime when editing a record they just created or updated and committed to the database, based on their own existing tables, namely the error: JBO-25014: Another user has changed the row with primary key oracle.jbo.Key[x] ...where X is the primary key value of the row at hand.  In a production environment with multiple users this error may be legit, one of the other users has updated the row since you queried it.  Yet in a development environment this error is just plain confusing.  If developers are isolated in their own database, creating and editing records they know other users can't possibly be working with, or all the other developers have gone home for the day, how is this error possible? There are no other users?  It must be the phantom ADF developer! [insert dramatic music here] The following picture is what you'll see in the Business Component Browser, and you'll receive a similar error message via an ADF Faces page: A false conclusion What can possibly cause this issue if it isn't our phantom ADF developer?  Doesn't ADF BC implement record locking, locking database records when the row is modified in the ADF middle-tier by a user?  How can our phantom ADF developer even take out a lock if this is the case?  Maybe ADF has a bug, maybe ADF isn't implementing record locking at all?  Shouldn't we see the error "JBO-26030: Failed to lock the record, another user holds the lock" as we attempt to modify the record, why do we see JBO-25014? : Let's verify that ADF is in fact issuing the correct SQL LOCK-FOR-UPDATE statement to the database. First we need to verify ADF's locking strategy.  It is determined by the Application Module's jbo.locking.mode property.  The default (as of JDev 11.1.1.4.0 if memory serves me correct) and recommended value is optimistic, and the other valid value is pessimistic. Next we need a mechanism to check that ADF is issuing the LOCK statements to the database.  We could ask DBAs to monitor locks with OEM, but optimally we'd rather not involve overworked DBAs in this process, so instead we can use the ADF runtime setting –Djbo.debugoutput=console.  At runtime this options turns on instrumentation within the ADF BC layer, which among a lot of extra detail displayed in the log window, will show the actual SQL statement issued to the database, including the LOCK statement we're looking to confirm. Setting our locking mode to pessimistic, opening the Business Components Browser of a JSF page allowing us to edit a record, say the CHARGEABLE field within a BOOKINGS record where BOOKING_NO = 1206, upon editing the record see among others the following log entries: [421] Built select: 'SELECT BOOKING_NO, EVENT_NO, RESOURCE_CODE, CHARGEABLE, MADE_BY, QUANTITY, COST, STATUS, COMMENTS FROM BOOKINGS Bookings'[422] Executing LOCK...SELECT BOOKING_NO, EVENT_NO, RESOURCE_CODE, CHARGEABLE, MADE_BY, QUANTITY, COST, STATUS, COMMENTS FROM BOOKINGS Bookings WHERE BOOKING_NO=:1 FOR UPDATE NOWAIT[423] Where binding param 1: 1206  As can be seen on line 422, in fact a LOCK-FOR-UPDATE is indeed issued to the database.  Later when we commit the record we see: [441] OracleSQLBuilder: SAVEPOINT 'BO_SP'[442] OracleSQLBuilder Executing, Lock 1 DML on: BOOKINGS (Update)[443] UPDATE buf Bookings>#u SQLStmtBufLen: 210, actual=62[444] UPDATE BOOKINGS Bookings SET CHARGEABLE=:1 WHERE BOOKING_NO=:2[445] Update binding param 1: N[446] Where binding param 2: 1206[447] BookingsView1 notify COMMIT ... [448] _LOCAL_VIEW_USAGE_model_Bookings_ResourceTypesView1 notify COMMIT ... [449] EntityCache close prepared statement ....and as a result the changes are saved to the database, and the lock is released. Let's see what happens when we use the optimistic locking mode, this time to change the same BOOKINGS record CHARGEABLE column again.  As soon as we edit the record we see little activity in the logs, nothing to indicate any SQL statement, let alone a LOCK has been taken out on the row. However when we save our records by issuing a commit, the following is recorded in the logs: [509] OracleSQLBuilder: SAVEPOINT 'BO_SP'[510] OracleSQLBuilder Executing doEntitySelect on: BOOKINGS (true)[511] Built select: 'SELECT BOOKING_NO, EVENT_NO, RESOURCE_CODE, CHARGEABLE, MADE_BY, QUANTITY, COST, STATUS, COMMENTS FROM BOOKINGS Bookings'[512] Executing LOCK...SELECT BOOKING_NO, EVENT_NO, RESOURCE_CODE, CHARGEABLE, MADE_BY, QUANTITY, COST, STATUS, COMMENTS FROM BOOKINGS Bookings WHERE BOOKING_NO=:1 FOR UPDATE NOWAIT[513] Where binding param 1: 1205[514] OracleSQLBuilder Executing, Lock 2 DML on: BOOKINGS (Update)[515] UPDATE buf Bookings>#u SQLStmtBufLen: 210, actual=62[516] UPDATE BOOKINGS Bookings SET CHARGEABLE=:1 WHERE BOOKING_NO=:2[517] Update binding param 1: Y[518] Where binding param 2: 1205[519] BookingsView1 notify COMMIT ... [520] _LOCAL_VIEW_USAGE_model_Bookings_ResourceTypesView1 notify COMMIT ... [521] EntityCache close prepared statement Again even though we're seeing the midtier delay the LOCK statement until commit time, it is in fact occurring on line 412, and released as part of the commit issued on line 419.  Therefore with either optimistic or pessimistic locking a lock is indeed issued. Our conclusion at this point must be, unless there's the unlikely cause the LOCK statement is never really hitting the database, or the even less likely cause the database has a bug, then ADF does in fact take out a lock on the record before allowing the current user to update it.  So there's no way our phantom ADF developer could even modify the record if he tried without at least someone receiving a lock error. Hmm, we can only conclude the locking mode is a red herring and not the true cause of our problem.  Who is the phantom? At this point we'll need to conclude that the error message "JBO-25014: Another user has changed" is somehow legit, even though we don't understand yet what's causing it. This leads onto two further questions, how does ADF know another user has changed the row, and what's been changed anyway? To answer the first question, how does ADF know another user has changed the row, the Fusion Guide's section 4.10.11 How to Protect Against Losing Simultaneous Updated Data , that details the Entity Object Change-Indicator property, gives us the answer: At runtime the framework provides automatic "lost update" detection for entity objects to ensure that a user cannot unknowingly modify data that another user has updated and committed in the meantime. Typically, this check is performed by comparing the original values of each persistent entity attribute against the corresponding current column values in the database at the time the underlying row is locked. Before updating a row, the entity object verifies that the row to be updated is still consistent with the current state of the database.  The guide further suggests to make this solution more efficient: You can make the lost update detection more efficient by identifying any attributes of your entity whose values you know will be updated whenever the entity is modified. Typical candidates include a version number column or an updated date column in the row.....To detect whether the row has been modified since the user queried it in the most efficient way, select the Change Indicator option to compare only the change-indicator attribute values. We now know that ADF BC doesn't use the locking mechanism at all to protect the current user against updates, but rather it keeps a copy of the original record fetched, separate to the user changed version of the record, and it compares the original record against the one in the database when the lock is taken out.  If values don't match, be it the default compare-all-columns behaviour, or the more efficient Change Indicator mechanism, ADF BC will throw the JBO-25014 error. This leaves one last question.  Now we know the mechanism under which ADF identifies a changed row, what we don't know is what's changed and who changed it? The real culprit What's changed?  We know the record in the mid-tier has been changed by the user, however ADF doesn't use the changed record in the mid-tier to compare to the database record, but rather a copy of the original record before it was changed.  This leaves us to conclude the database record has changed, but how and by who? There are three potential causes: Database triggers The database trigger among other uses, can be configured to fire PLSQL code on a database table insert, update or delete.  In particular in an insert or update the trigger can override the value assigned to a particular column.  The trigger execution is actioned by the database on behalf of the user initiating the insert or update action. Why this causes the issue specific to our ADF use, is when we insert or update a record in the database via ADF, ADF keeps a copy of the record written to the database.  However the cached record is instantly out of date as the database triggers have modified the record that was actually written to the database.  Thus when we update the record we just inserted or updated for a second time to the database, ADF compares its original copy of the record to that in the database, and it detects the record has been changed – giving us JBO-25014. This is probably the most common cause of this problem. Default values A second reason this issue can occur is another database feature, default column values.  When creating a database table the schema designer can define default values for specific columns.  For example a CREATED_BY column could be set to SYSDATE, or a flag column to Y or N.  Default values are only used by the database when a user inserts a new record and the specific column is assigned NULL.  The database in this case will overwrite the column with the default value. As per the database trigger section, it then becomes apparent why ADF chokes on this feature, though it can only specifically occur in an insert-commit-update-commit scenario, not the update-commit-update-commit scenario. Instead of trigger views I must admit I haven't double checked this scenario but it seems plausible, that of the Oracle database's instead of trigger view (sometimes referred to as instead of views).  A view in the database is based on a query, and dependent on the queries complexity, may support insert, update and delete functionality to a limited degree.  In order to support fully insertable, updateable and deletable views, Oracle introduced the instead of view, that gives the view designer the ability to not only define the view query, but a set of programmatic PLSQL triggers where the developer can define their own logic for inserts, updates and deletes. While this provides the database programmer a very powerful feature, it can cause issues for our ADF application.  On inserting or updating a record in the instead of view, the record and it's data that goes in is not necessarily the data that comes out when ADF compares the records, as the view developer has the option to practically do anything with the incoming data, including throwing it away or pushing it to tables which aren't used by the view underlying query for fetching the data. Readers are at this point reminded that this article is specifically about how the JBO-25014 error occurs in the context of 1 developer on an isolated database.  The article is not considering how the error occurs in a production environment where there are multiple users who can cause this error in a legitimate fashion.  Assuming none of the above features are the cause of the problem, and optimistic locking is turned on (this error is not possible if pessimistic locking is the default mode *and* none of the previous causes are possible), JBO-25014 is quite feasible in a production ADF application if 2 users modify the same record. At this point under project timelines pressure, the obvious fix for developers is to drop both database triggers and default values from the underlying tables.  However we must be careful that these legacy constructs aren't used and assumed to be in place by other legacy systems.  Dropping the database triggers or default value that the existing Oracle Forms  applications assumes and requires to be in place could cause unexpected behaviour and bugs in the Forms application.  Proficient software engineers would recognize such a change may require a partial or full regression test of the existing legacy system, a potentially costly and timely exercise, not ideal. Solving the mystery once and for all Luckily ADF has built in functionality to deal with this issue, though it's not a surprise, as Oracle as the author of ADF also built the database, and are fully aware of the Oracle database's feature set.  At the Entity Object attribute level, the Refresh After Insert and Refresh After Update properties.  Simply selecting these instructs ADF BC after inserting or updating a record to the database, to expect the database to modify the said attributes, and read a copy of the changed attributes back into its cached mid-tier record.  Thus next time the developer modifies the current record, the comparison between the mid-tier record and the database record match, and JBO-25014: Another user has changed" is no longer an issue. [Post edit - as per the comment from Oracle's Steven Davelaar below, as he correctly points out the above solution will not work for instead-of-triggers views as it relies on SQL RETURNING clause which is incompatible with this type of view] Alternatively you can set the Change Indicator on one of the attributes.  This will work as long as the relating column for the attribute in the database itself isn't inadvertently updated.  In turn you're possibly just masking the issue rather than solving it, because if another developer turns the Change Indicator back on the original issue will return.

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• MERGE Bug with Filtered Indexes

  - by Paul White

  A MERGE statement can fail, and incorrectly report a unique key violation when: The target table uses a unique filtered index; and No key column of the filtered index is updated; and A column from the filtering condition is updated; and Transient key violations are possible Example Tables Say we have two tables, one that is the target of a MERGE statement, and another that contains updates to be applied to the target.  The target table contains three columns, an integer primary key, a single character alternate key, and a status code column.  A filtered unique index exists on the alternate key, but is only enforced where the status code is ‘a’: CREATE TABLE #Target ( pk integer NOT NULL, ak character(1) NOT NULL, status_code character(1) NOT NULL,   PRIMARY KEY (pk) );   CREATE UNIQUE INDEX uq1 ON #Target (ak) INCLUDE (status_code) WHERE status_code = 'a'; The changes table contains just an integer primary key (to identify the target row to change) and the new status code: CREATE TABLE #Changes ( pk integer NOT NULL, status_code character(1) NOT NULL,   PRIMARY KEY (pk) ); Sample Data The sample data for the example is: INSERT #Target (pk, ak, status_code) VALUES (1, 'A', 'a'), (2, 'B', 'a'), (3, 'C', 'a'), (4, 'A', 'd');   INSERT #Changes (pk, status_code) VALUES (1, 'd'), (4, 'a');          Target                     Changes +-----------------------+    +------------------+ ¦ pk ¦ ak ¦ status_code ¦    ¦ pk ¦ status_code ¦ ¦----+----+-------------¦    ¦----+-------------¦ ¦  1 ¦ A  ¦ a           ¦    ¦  1 ¦ d           ¦ ¦  2 ¦ B  ¦ a           ¦    ¦  4 ¦ a           ¦ ¦  3 ¦ C  ¦ a           ¦    +------------------+ ¦  4 ¦ A  ¦ d           ¦ +-----------------------+ The target table’s alternate key (ak) column is unique, for rows where status_code = ‘a’.  Applying the changes to the target will change row 1 from status ‘a’ to status ‘d’, and row 4 from status ‘d’ to status ‘a’.  The result of applying all the changes will still satisfy the filtered unique index, because the ‘A’ in row 1 will be deleted from the index and the ‘A’ in row 4 will be added. Merge Test One Let’s now execute a MERGE statement to apply the changes: MERGE #Target AS t USING #Changes AS c ON c.pk = t.pk WHEN MATCHED AND c.status_code <> t.status_code THEN UPDATE SET status_code = c.status_code; The MERGE changes the two target rows as expected.  The updated target table now contains: +-----------------------+ ¦ pk ¦ ak ¦ status_code ¦ ¦----+----+-------------¦ ¦  1 ¦ A  ¦ d           ¦ <—changed from ‘a’ ¦  2 ¦ B  ¦ a           ¦ ¦  3 ¦ C  ¦ a           ¦ ¦  4 ¦ A  ¦ a           ¦ <—changed from ‘d’ +-----------------------+ Merge Test Two Now let’s repopulate the changes table to reverse the updates we just performed: TRUNCATE TABLE #Changes;   INSERT #Changes (pk, status_code) VALUES (1, 'a'), (4, 'd'); This will change row 1 back to status ‘a’ and row 4 back to status ‘d’.  As a reminder, the current state of the tables is:          Target                        Changes +-----------------------+    +------------------+ ¦ pk ¦ ak ¦ status_code ¦    ¦ pk ¦ status_code ¦ ¦----+----+-------------¦    ¦----+-------------¦ ¦  1 ¦ A  ¦ d           ¦    ¦  1 ¦ a           ¦ ¦  2 ¦ B  ¦ a           ¦    ¦  4 ¦ d           ¦ ¦  3 ¦ C  ¦ a           ¦    +------------------+ ¦  4 ¦ A  ¦ a           ¦ +-----------------------+ We execute the same MERGE statement: MERGE #Target AS t USING #Changes AS c ON c.pk = t.pk WHEN MATCHED AND c.status_code <> t.status_code THEN UPDATE SET status_code = c.status_code; However this time we receive the following message: Msg 2601, Level 14, State 1, Line 1 Cannot insert duplicate key row in object 'dbo.#Target' with unique index 'uq1'. The duplicate key value is (A). The statement has been terminated. Applying the changes using UPDATE Let’s now rewrite the MERGE to use UPDATE instead: UPDATE t SET status_code = c.status_code FROM #Target AS t JOIN #Changes AS c ON t.pk = c.pk WHERE c.status_code <> t.status_code; This query succeeds where the MERGE failed.  The two rows are updated as expected: +-----------------------+ ¦ pk ¦ ak ¦ status_code ¦ ¦----+----+-------------¦ ¦  1 ¦ A  ¦ a           ¦ <—changed back to ‘a’ ¦  2 ¦ B  ¦ a           ¦ ¦  3 ¦ C  ¦ a           ¦ ¦  4 ¦ A  ¦ d           ¦ <—changed back to ‘d’ +-----------------------+ What went wrong with the MERGE? In this test, the MERGE query execution happens to apply the changes in the order of the ‘pk’ column. In test one, this was not a problem: row 1 is removed from the unique filtered index by changing status_code from ‘a’ to ‘d’ before row 4 is added.  At no point does the table contain two rows where ak = ‘A’ and status_code = ‘a’. In test two, however, the first change was to change row 1 from status ‘d’ to status ‘a’.  This change means there would be two rows in the filtered unique index where ak = ‘A’ (both row 1 and row 4 meet the index filtering criteria ‘status_code = a’). The storage engine does not allow the query processor to violate a unique key (unless IGNORE_DUP_KEY is ON, but that is a different story, and doesn’t apply to MERGE in any case).  This strict rule applies regardless of the fact that if all changes were applied, there would be no unique key violation (row 4 would eventually be changed from ‘a’ to ‘d’, removing it from the filtered unique index, and resolving the key violation). Why it went wrong The query optimizer usually detects when this sort of temporary uniqueness violation could occur, and builds a plan that avoids the issue.  I wrote about this a couple of years ago in my post Beware Sneaky Reads with Unique Indexes (you can read more about the details on pages 495-497 of Microsoft SQL Server 2008 Internals or in Craig Freedman’s blog post on maintaining unique indexes).  To summarize though, the optimizer introduces Split, Filter, Sort, and Collapse operators into the query plan to: Split each row update into delete followed by an inserts Filter out rows that would not change the index (due to the filter on the index, or a non-updating update) Sort the resulting stream by index key, with deletes before inserts Collapse delete/insert pairs on the same index key back into an update The effect of all this is that only net changes are applied to an index (as one or more insert, update, and/or delete operations).  In this case, the net effect is a single update of the filtered unique index: changing the row for ak = ‘A’ from pk = 4 to pk = 1.  In case that is less than 100% clear, let’s look at the operation in test two again:          Target                     Changes                   Result +-----------------------+    +------------------+    +-----------------------+ ¦ pk ¦ ak ¦ status_code ¦    ¦ pk ¦ status_code ¦    ¦ pk ¦ ak ¦ status_code ¦ ¦----+----+-------------¦    ¦----+-------------¦    ¦----+----+-------------¦ ¦  1 ¦ A  ¦ d           ¦    ¦  1 ¦ d           ¦    ¦  1 ¦ A  ¦ a           ¦ ¦  2 ¦ B  ¦ a           ¦    ¦  4 ¦ a           ¦    ¦  2 ¦ B  ¦ a           ¦ ¦  3 ¦ C  ¦ a           ¦    +------------------+    ¦  3 ¦ C  ¦ a           ¦ ¦  4 ¦ A  ¦ a           ¦                            ¦  4 ¦ A  ¦ d           ¦ +-----------------------+                            +-----------------------+ From the filtered index’s point of view (filtered for status_code = ‘a’ and shown in nonclustered index key order) the overall effect of the query is:   Before           After +---------+    +---------+ ¦ pk ¦ ak ¦    ¦ pk ¦ ak ¦ ¦----+----¦    ¦----+----¦ ¦  4 ¦ A  ¦    ¦  1 ¦ A  ¦ ¦  2 ¦ B  ¦    ¦  2 ¦ B  ¦ ¦  3 ¦ C  ¦    ¦  3 ¦ C  ¦ +---------+    +---------+ The single net change there is a change of pk from 4 to 1 for the nonclustered index entry ak = ‘A’.  This is the magic performed by the split, sort, and collapse.  Notice in particular how the original changes to the index key (on the ‘ak’ column) have been transformed into an update of a non-key column (pk is included in the nonclustered index).  By not updating any nonclustered index keys, we are guaranteed to avoid transient key violations. The Execution Plans The estimated MERGE execution plan that produces the incorrect key-violation error looks like this (click to enlarge in a new window): The successful UPDATE execution plan is (click to enlarge in a new window): The MERGE execution plan is a narrow (per-row) update.  The single Clustered Index Merge operator maintains both the clustered index and the filtered nonclustered index.  The UPDATE plan is a wide (per-index) update.  The clustered index is maintained first, then the Split, Filter, Sort, Collapse sequence is applied before the nonclustered index is separately maintained. There is always a wide update plan for any query that modifies the database. The narrow form is a performance optimization where the number of rows is expected to be relatively small, and is not available for all operations.  One of the operations that should disallow a narrow plan is maintaining a unique index where intermediate key violations could occur. Workarounds The MERGE can be made to work (producing a wide update plan with split, sort, and collapse) by: Adding all columns referenced in the filtered index’s WHERE clause to the index key (INCLUDE is not sufficient); or Executing the query with trace flag 8790 set e.g. OPTION (QUERYTRACEON 8790). Undocumented trace flag 8790 forces a wide update plan for any data-changing query (remember that a wide update plan is always possible).  Either change will produce a successfully-executing wide update plan for the MERGE that failed previously. Conclusion The optimizer fails to spot the possibility of transient unique key violations with MERGE under the conditions listed at the start of this post.  It incorrectly chooses a narrow plan for the MERGE, which cannot provide the protection of a split/sort/collapse sequence for the nonclustered index maintenance. The MERGE plan may fail at execution time depending on the order in which rows are processed, and the distribution of data in the database.  Worse, a previously solid MERGE query may suddenly start to fail unpredictably if a filtered unique index is added to the merge target table at any point. Connect bug filed here Tests performed on SQL Server 2012 SP1 CUI (build 11.0.3321) x64 Developer Edition © 2012 Paul White – All Rights Reserved Twitter: @SQL_Kiwi Email: [email protected]

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• windows shell scripting through java

  - by GAURAV JAISWAL

  i am designing a desktop application like nero for removable media storage that also includes features of copyfast. i want to add an option of my own choice in the windows explorer right click menu. how can i do that? am i proceeding in the right direction?

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• Prevent Custom Entity being deleted from Entity Framework during Update Model Wizard

  - by rbg

  In Entity Framework v1 If you create a Custom Entity to map it to a Stored Procedure during FunctionImport and then Select "Update Model from Database" the Update Model Wizard removes the Custom Entity (as added Manually in the SSDL XML prior to functionImport) from the SSDL. Does anyone know if this limitation has been dealt with Entity Framework v4? I mean is there a way to prevent the Wizard from removing the Custom Entity from the Storage Schema (SSDL) during Model Update from Database????

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• Performing Breadth First Search recursively

  - by Nathan

  Let's say you wanted to implement a breadth-first search of a binary tree recursively. How would you go about it? Is it possible using only the call-stack as auxiliary storage?

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• Adobe AIR - file locked by air

  - by Neil

  Hello I am downloading and storing files locally in the app storage domain. For some reason one of the files gets locked by air. I found this by looking at process explorer. If I clear the browser cache the file never gets locked, only if it attempts to download the file but it exists in browser cache does air lock the damn file. Please can you help? Neil

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• Asp.net Membership Provider ValidateUser Fails...clear text password matches, what gives?

  - by Webjedi

  In my MVC application, I'm using a pretty vanilla implementation of Membership, however my call to Membership.ValidateUser(username,password)...fails...even though (using clear text storage for testing) I know they match. Anyone ever come across that before?

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• CherryPy sessions for same domain, different port

  - by detly

  Consider the script below. It will launch two subprocesses, each one a CherryPy app (hit Ctrl+C or whatever the KeyboardInterrupt combo is on your system to end them both). If you run it with CP 3.0 (taking care to change the 3.0/3.1 specific lines in "StartServer"), then visit: http://localhost:15002/ ...you see an empty dict. Then visit: http://localhost:15002/set?val=10 http://localhost:15002/ ...and you see the newly populated dict. Then visit: http://localhost:15012/ ...and go back to http://localhost:15002/ ...and nothing has changed. If you try the same thing with CP 3.1 (remember the lines in "StartServer"!), when you get to the last step, the dict is now empty. This happens in Windows and Debian, Python 2.5 and 2.6. You can try all sorts of things: changing to file storage, separating the storage paths... the only difference it makes is that the sessions might get merged instead of erased. I've read another post about this as well, and there's a suggestion there to put the session tools config keys in the app config rather than the global config, but I don't think that's relevant to this usage where the apps run independently. What do I do to get independent CherryPy applications to NOT interfere with each other? Note: I originally asked this on the CherryPy mailing list but haven't had a response yet so I'm trying here. I hope that's okay. import os, os.path, socket, sys import subprocess import cgi import cherrypy HTTP_PORT = 15002 HTTP_HOST = "127.0.0.1" site1conf = { 'global' : { 'server.socket_host' : HTTP_HOST, 'server.socket_port' : HTTP_PORT, 'tools.sessions.on' : True, # 'tools.sessions.storage_type': 'file', # 'tools.sessions.storage_path': '1', # 'tools.sessions.storage_path': '.', 'tools.sessions.timeout' : 1440}} site2conf = { 'global' : { 'server.socket_host' : HTTP_HOST, 'server.socket_port' : HTTP_PORT + 10, 'tools.sessions.on' : True, # 'tools.sessions.storage_type': 'file', # 'tools.sessions.storage_path': '2', # 'tools.sessions.storage_path': '.', 'tools.sessions.timeout' : 1440}} class Home(object) : def __init__(self, key): self.key = key @cherrypy.expose def index(self): return """\ <html> <body>Session: <br>%s </body> </html> """ % cgi.escape(str(dict(cherrypy.session))) @cherrypy.expose def set(self, val): cherrypy.session[self.key.upper()] = val return """\ <html> <body>Set %s to %s</body> </html>""" % (cgi.escape(self.key), cgi.escape(val)) def StartServer(conf, key): cherrypy.config.update(conf) print 'Starting server (%s)' % key cherrypy.tree.mount(Home(key), '/', {}) # Start the web server. #### 3.0 # cherrypy.server.quickstart() # cherrypy.engine.start() #### #### 3.1 cherrypy.engine.start() cherrypy.engine.block() #### def Main(): # Start first webserver proc1 = subprocess.Popen( [sys.executable, os.path.abspath(__file__), "1"]) proc2 = subprocess.Popen( [sys.executable, os.path.abspath(__file__), "2"]) proc1.wait() proc2.wait() if __name__ == "__main__": print sys.argv if len(sys.argv) == 1: # Master process Main() elif(int(sys.argv[1]) == 1): StartServer(site1conf, 'magic') elif(int(sys.argv[1]) == 2): StartServer(site2conf, 'science') else: sys.exit(1)

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• how to integrate openCV and ARtoolkit

  - by mehmet

  hi all, I need to use both openCV and ARtoolkit libraries in the same project. I'm trying to get frame by using arVideoGetImage() function in order to process for with openCV functions. however program throws a "System.AccessViolationException" error in the following line of face detection example: CvSeq *faces = cvHaarDetectObjects(img, cascade, storage, 1.1, 3, 0, cvSize( 40, 40 )); ARtoolkit and openCV are work perfectly separately. Anyone has able to work these two library together, or any suggestion?? thanks

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• Problem with core data migration mapping model

  - by dpratt

  I have an iphone app that uses Core Data to do storage. I have successfully deployed it, and now I'm working on the second version. I've run into a problem with the data model that will require a few very simple data transformations at the time that the persistent store gets upgraded, so I can't just use the default inferred mapping model. My object model is stored in an .xcdatamodeld bundle, with versions 1.0 and 1.1 next to each other. Version 1.1 is set as the active version. Everything works fine when I use the default migration behavior and set NSInferMappingModelAutomaticallyOption to YES. My sqlite storage gets upgraded from the 1.0 version of the model, and everything is good except for, of course, the few transformations I need done. As an additional experimental step, I added a new Mapping Model to the core data model bundle, and have made no changes to what xcode generated. When I run my app (with an older version of the data store), I get the following * Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'Object's persistent store is not reachable from this NSManagedObjectContext's coordinator' What am I doing wrong? Here's my code for to get the managed object model and the persistent store coordinator. - (NSPersistentStoreCoordinator *)persistentStoreCoordinator { if (_persistentStoreCoordinator != nil) { return _persistentStoreCoordinator; } _persistentStoreCoordinator = [[NSPersistentStoreCoordinator alloc] initWithManagedObjectModel:[self managedObjectModel]]; NSURL *storeUrl = [NSURL fileURLWithPath: [[self applicationDocumentsDirectory] stringByAppendingPathComponent: @"gti_store.sqlite"]]; NSError *error; NSDictionary *options = [NSDictionary dictionaryWithObjectsAndKeys: [NSNumber numberWithBool:YES], NSMigratePersistentStoresAutomaticallyOption, [NSNumber numberWithBool:YES], NSInferMappingModelAutomaticallyOption, nil]; if (![_persistentStoreCoordinator addPersistentStoreWithType:NSSQLiteStoreType configuration:nil URL:storeUrl options:options error:&error]) { NSLog(@"Eror creating persistent store coodinator - %@", [error localizedDescription]); } return _persistentStoreCoordinator; } - (NSManagedObjectModel *)managedObjectModel { if(_managedObjectModel == nil) { _managedObjectModel = [[NSManagedObjectModel mergedModelFromBundles:nil] retain]; NSDictionary *entities = [_managedObjectModel entitiesByName]; //add a sort descriptor to the 'Foo' fetched property so that it can have an ordering - you can't add these from the graphical core data modeler NSEntityDescription *entity = [entities objectForKey:@"Foo"]; NSFetchedPropertyDescription *fetchedProp = [[entity propertiesByName] objectForKey:@"orderedBar"]; NSSortDescriptor* sortDescriptor = [[[NSSortDescriptor alloc] initWithKey:@"index" ascending:YES] autorelease]; NSArray* sortDescriptors = [NSArray arrayWithObjects:sortDescriptor, nil]; [[fetchedProp fetchRequest] setSortDescriptors:sortDescriptors]; } return _managedObjectModel; }

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• Storing data to SequenceFile from Apache Pig

  - by asquithea

  Apache Pig can load data from Hadoop sequence files using the PiggyBank SequenceFileLoader: REGISTER /home/hadoop/pig/contrib/piggybank/java/piggybank.jar; DEFINE SequenceFileLoader org.apache.pig.piggybank.storage.SequenceFileLoader(); log = LOAD '/data/logs' USING SequenceFileLoader AS (...) Is there also a library out there that would allow writing to Hadoop sequence files from Pig?

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• How to map XMLType with JPA/Hibernate

  - by Moorthy

  How to persist XMLType column via JPA/Hibernate? As per oracle documentation, there are two ways in declaring storage clause for XMLType. They are, LOB and Object-Relational. I dont want to go with LOB. I have schema and register into database. I have not have example on how to design my Entity for XMLType. Does any one know please share it?

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• fastest way to sort the entries of a "smooth" 2D array

  - by Drew Wagner

  What is the fastest way to sort the values in a smooth 2D array? The input is a small filtered image: about 60 by 80 pixels single channel single or double precision float row major storage, sequential in memory values have mixed sign piecewise "smooth", with regions on the order of 10 pixels wide Output is a flat (about 4800 value) array of the sorted values, along with the indices that sort the original array.

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• Authorizing a computer to access a web application

  - by HackedByChinese

  I have a web application, and am tasked with adding secure sign-on to bolster security, akin to what Google has added to Google accounts. Use Case Essentially, when a user logs in, we want to detect if the user has previously authorized this computer. If the computer has not been authorized, the user is sent a one-time password (via email, SMS, or phone call) that they must enter, where the user may choose to remember this computer. In the web application, we will track authorized devices, allowing users to see when/where they logged in from that device last, and deauthorize any devices if they so choose. We require a solution that is very light touch (meaning, requiring no client-side software installation), and works with Safari, Chrome, Firefox, and IE 7+ (unfortunately). We will offer x509 security, which provides adequate security, but we still need a solution for customers that can't or won't use x509. My intention is to store authorization information using cookies (or, potentially, using local storage, degrading to flash cookies, and then normal cookies). At First Blush Track two separate values (local data or cookies): a hash representing a secure sign-on token, as well as a device token. Both values are driven (and recorded) by the web application, and dictated to the client. The SSO token is dependent on the device as well as a sequence number. This effectively allows devices to be deauthorized (all SSO tokens become invalid) and mitigates replay (not effectively, though, which is why I'm asking this question) through the use of a sequence number, and uses a nonce. Problem With this solution, it's possible for someone to just copy the SSO and device tokens and use in another request. While the sequence number will help me detect such an abuse and thus deauthorize the device, the detection and response can only happen after the valid device and malicious request both attempt access, which is ample time for damage to be done. I feel like using HMAC would be better. Track the device, the sequence, create a nonce, timestamp, and hash with a private key, then send the hash plus those values as plain text. Server does the same (in addition to validating the device and sequence) and compares. That seems much easier, and much more reliable.... assuming we can securely negotiate, exchange, and store private keys. Question So then, how can I securely negotiate a private key for authorized device, and then securely store that key? Is it more possible, at least, if I settle for storing the private key using local storage or flash cookies and just say it's "good enough"? Or, is there something I can do to my original draft to mitigate the vulnerability I describe?

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• progressIndicator does not update till about 10 seconds after awakeFromNib occures

  - by theprojectabot

  I have been trying to get this one section of my UI to immediatly up date when the document loads into view. The awakeFromNib fires the pasted code and then starts a timer to repeat every 10 seconds... I load a default storage location: ~/Movies... which shows up immediately.. yet the network location that is saved in the document that gets pulled from the XML only seems to show up after the second firing of the - (void)updateDiskSpaceDisplay timer. I have set breakpoints and know that the ivars that contain the values that are being put into the *fileSystemAttributes is the network location right when the awakeFromNib occurs... Im confused why it magically appears after the second time firing instead of immediately displaying the write values. - (void)updateDiskSpaceDisplay { // Obtain information about the file system used on the selected storage path. NSError *error = NULL; NSDictionary *fileSystemAttributes = [[NSFileManager defaultManager] attributesOfFileSystemForPath:[[[self settings] containerSettings] storagePath] error:&error]; if( !fileSystemAttributes ) return; // Get the byte capacity of the drive. long long byteCapacity = [[fileSystemAttributes objectForKey:NSFileSystemSize] unsignedLongLongValue]; // Get the number of free bytes. long long freeBytes = [[fileSystemAttributes objectForKey:NSFileSystemFreeSize] unsignedLongLongValue]; // Update the level indicator, and the text fields to show the current information. [totalDiskSpaceField setStringValue:[self formattedStringFromByteCount:byteCapacity]]; [totalDiskSpaceField setNeedsDisplay:YES]; [usedDiskSpaceField setStringValue:[self formattedStringFromByteCount:(byteCapacity - freeBytes)]]; [usedDiskSpaceField setNeedsDisplay:YES]; [diskSpaceIndicator setMaxValue:100]; [diskSpaceIndicator setIntValue:(((float) (byteCapacity - freeBytes) / (float) byteCapacity) * 100.0)]; [diskSpaceIndicator display:YES]; } thoughts? my awakeFromNib: - (void)awakeFromNib { [documentWindow setAcceptsMouseMovedEvents:YES]; [documentWindow setDelegate:self]; [self updateSettingsDisplay]; [self updateDiskSpaceDisplay]; [self setDiskSpaceUpdateTimer:[NSTimer scheduledTimerWithTimeInterval:10.0 target:self selector:@selector(updateDiskSpaceDisplay) userInfo:NULL repeats:YES]]; [self setUpClipInfoTabButtons]; [self performSelector:@selector(setupEngineController) withObject:NULL afterDelay:0.1]; }

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• MySQL: Will a column-oriented engine be available in MySQL 5.5?

  - by JakiT

  Will a column-oriented storage engine (e.g. InfiniDB) be available in the core release of MySQL 5.5? Meaning, not as a plugin but available with the core MySQL 5.5 bundle.

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• In C, Is a static variable stored on the stack or the heap??

  - by CVS26

  In C, Is a static variable stored on the stack or the heap?? I always thought that static vars are stored on the heap. (global lifetime) I Got this doubt while answering the following Q: http://stackoverflow.com/questions/2661369/storage-classes Please clarify...

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• Simplest database implementation

  - by MaX

  I am looking for a really simple database implementation; basically one with no complex parsing SQL engine. What I am looking for is something demonstrating B+ trees and ACID storage (Suitable for educational purposes). What I have found up-till now form my current searches was hamster-db. I am looking for something even simpler with a smaller code-base. If there is any such opensource project in your knowledge please let me know.

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• Detect base64 encoding in PHP?

  - by Ian Silber

  Is there some way to detect if a string has been base64_encoded() in PHP? We're converting some storage from plain text to base64 and part of it lives in a cookie that needs to be updated. I'd like to reset their cookie if the text has not yet been encoded, otherwise leave it alone.

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