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• Best tool to recover removed files

  - by plua

  Using Ubuntu 10.10, I have a startup script that automatically removes my 'working directory'. This is a simple folder on my Desktop where I place a bunch of files that I use throughout the day. These are temporary files I need to store just for that one session. In order to keep things clean, my startup script does: rm -rf /home/user/Desktop/workdir mkdir /home/user/Desktop/workdir Works great. Till the moment I had some important files there and forgot to move them before shutting down. A few (2-3) sessions ago this happened and I now realize I need to recover the "workdir" directory. But several new ones have been created and removed in the meantime. What is the best way to recover this - if possible? I read about tools like scalpel but it seems they will scan my whole HD. I know the name of the folder and would like to just look for this workdir folder. What is best?

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• What is the best C++ interview question?

  - by David Thielen

  If you could ask a C++ programmer one question to measure their C++ skills, what would it be? The question I think is best is: Can you call "delete this;" inside a member function? (I put this as a link so you can think it through first, then go to The Best C++ Interview Question – Ever! to see the correct answer.) I don't ask this because I expect most people to know the answer. If they did it would not be that useful a question. I ask to see if they can work their way to the correct answer and how they do so.

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• New Time Zone Patch DST V18 is available

  - by Mike Dietrich

  Sorry for not updating the blog more often at the moment - but more updates will come soon as I play around with Oracle Restart and single instance databases in ASM with Oracle 11.2. Just on the side there's a new time zone patch to DST V18 available since May 2012. You can download it via PATCH download from MOS with the patch number: 13417321 What do you think? Will Lufthansa operate a faster jet the other night? Will the jet stream be more powerful? Or a better type of fuel? Or is it just the travel portal which hasn't applied the correct time zone patches to catch DST change that night in the US whereas it happens two weeks later in Europe? Guess ... And please see the readme about how to apply the patch and our slides about why time zone patching may be important even in your environment RDBMS bug: Bug 13417321: DST 18 : HALF YEARLY DST PATCHES, MAY 2012 OJVM Bug 14112098 - dst changes for dstv18 (tzdata2012c) - need ojvm fix

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• 11.2.0.3 Pre-Upgrade Script Now Available!

  - by roy.swonger

  It took a little while because of upgrades to My Oracle Support, but the pre-upgrade script for Oracle Database 11.2.0.3 is now available for download. If you want the latest pre-upgrade script for any supported version of the database, simply go to MOS Note 884522.1 and download the script that corresponds to your destination release. This is a lot easier than downloading the entire kit in order to obtain the script!

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• Web Usage Policies at "Best Companies to Work For"

  - by Greg

  For any company that has made it onto a "Best Companies to Work For" list* in 2010 that hires programmers, what restrictions on web usage do they have in place? Does that company view unrestricted internet access as a benefit to their employees even if they might use it for non-work related reasons? If you can provide a link to back up this information, even better. (* I don't want to promote any specific publication, but they are easy enough to find.) My hypothesis is that a company that aspires to be one of the best needs to provide fairly unrestricted internet access and I'm trying to test it.

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• Guaranteed Restore Points as Fallback Method

  - by Mike Dietrich

  Thanks to the great audience yesterday in the Upgrade & Migration Workshop in Utrecht. That was really fun and I was amazed by our new facilities (and the  "wellness" lights surrounding the plenum room's walls). And another reason why I like to do these workshops is that often I learn new things from you So credits here to Rick van  Ek who has highlighted the following topic to me. Yesterday (and in some previous workshops) I did mention during the discussion about Fallback Strategies that you'll have to switch on Flashback Database beforehand to create a guaranteed restore point in case you'll encounter an issue during the database upgrade. I knew that we've made it possible since Oracle Database 11.2 to switch Flashback Database on without taking the database into MOUNT status (you could switch it off anyway while the database is open before in all releases). But before Oracle Database 11.2 that did require MOUNT status. SQL> create restore point rp1 guarantee flashback database ; create restore point rp1 guarantee flashback database * ERROR at line 1: ORA-38784: Cannot create restore point 'RP1'. ORA-38787: Creating the first guaranteed restore point requires mount mode when flashback database is off. But Rick did mention that I won't need to switch Flashback Database On to create a guaranteed restore point. And he's right - in older releases I would have had to go into MOUNT state to define the restore point which meant to restart the database. But in 11.2 that's no necessary anymore. And the same will apply when you upgrade your pre-11.2 database (e.g. an Oracle Database 10.2.0.4) to Oracle Database 11.2. As soon as you start your "old" not-yet-upgraded database in your 11.2 environment with STARTUP UPGRADE you can define a guaranteed restore point. If you tail the alert.log you'll see that the database will start the RVWR (Recovery Writer) background process - you'll just have to make sure that you'd define the values for db_recovery_file_dest_size and db_recovery_file_dest. SQL> startup upgrade ORACLE instance started. Total System Global Area  417546240 bytes Fixed Size                  2228944 bytes Variable Size             134221104 bytes Database Buffers          272629760 bytes Redo Buffers                8466432 bytes Database mounted. Database opened. SQL> create restore point grpt guarantee flashback database; Restore point created.SQL> drop restore point grpt; And don't forget to drop that restore point the sooner or later as it is guaranteed - and will fill up your Fast Recovery Area pretty quickly Just on the side: in any case archivelog mode is required if you'd like to work with restore points. - Mike

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• Should I use an interface when methods are only similar?

  - by Joshua Harris

  I was posed with the idea of creating an object that checks if a point will collide with a line: public class PointAndLineSegmentCollisionDetector { public void Collides(Point p, LineSegment s) { // ... } } This made me think that if I decided to create a Box object, then I would need a PointAndBoxCollisionDetector and a LineSegmentAndBoxCollisionDetector. I might even realize that I should have a BoxAndBoxCollisionDetector and a LineSegmentAndLineSegmentCollisionDetector. And, when I add new objects that can collide I would need to add even more of these. But, they all have a Collides method, so everything I learned about abstraction is telling me, "Make an interface." public interface CollisionDetector { public void Collides(Spatial s1, Spatial s2); } But now I have a function that only detects some abstract class or interface that is used by Point, LineSegment, Box, etc.. So if I did this then each implementation would have to to a type check to make sure that the types are the appropriate type because the collision algorithm is different for each different type match up. Another solution could be this: public class CollisionDetector { public void Collides(Point p, LineSegment s) { ... } public void Collides(LineSegment s, Box b) { ... } public void Collides(Point p, Box b) { ... } // ... } But, this could end up being a huge class that seems unwieldy, although it would have simplicity in that it is only a bunch of Collide methods. This is similar to C#'s Convert class. Which is nice because it is large, but it is simple to understand how it works. This seems to be the better solution, but I thought I should open it for discussion as a wiki to get other opinions.

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• Best practice Java - String array constant and indexing it

  - by Pramod

  For string constants its usual to use a class with final String values. But whats the best practice for storing string array. I want to store different categories in a constant array and everytime a category has been selected, I want to know which category it belongs to and process based on that. Addition : To make it more clear, I have a categories A,B,C,D,E which is a constant array. Whenever a user clicks one of the items(button will have those texts) I should know which item was clicked and do processing on that. I can define an enum(say cat) and everytime do if clickedItem == cat.A .... else if clickedItem = cat.B .... else if .... or even register listeners for each item seperately. But I wanted to know the best practice for doing handling these kind of problems.

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• Summer Upgrade Workshops are Open!

  - by roy.swonger

  The listing of upcoming events is located in the right sidebar of the main blog page, down below the flag counter. If you haven't checked out our schedule lately, you might be surprised at how active we will be with travel this summer. Coming up next week will be upgrade workshops in the USA (St. Louis and Minneapolis) followed by a pair in Canada (Toronto and Montreal) and then two in Europe (Brussels and Utrecht). Make your plans now to attend an upgrade workshop in your area. As you can see from the long list of planned events, it is very likely that Mike or I will be coming to your area sometime soon!

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• Too many heap subpools might break the upgrade

  - by Mike Dietrich

  Recently one of our new upcoming Oracle Database 11.2 reference customers did upgrade their production database - a huge EBS system - from Oracle 9.2.0.8 to Oracle Database 11.2.0.2. They've tested very well, we've optimized the upgrade process, the recompilation timings etc.  But once the live upgrade was done it did fail in the JAVA component piece with this error: begin if initjvmaux.startstep('CREATE_JAVA_SYSTEM') then * ORA-29553: classw in use: SYS.javax/mail/folder ORA-06512: at "SYS.INITJVMAUX", line 23 ORA-06512: at line 5 Support diagnosis was pretty quick - and refered to:Bug 10165223 - ORA-29553: class in use: sys.javax/mail/folder during database upgrade But how could this happen? Actually I don't know as we have used the same init.ora setup on test and production. The only difference: the prod system has more CPUs and RAM. Anyway, the bug names as workarounds to either decrease the SGA to less than 1GB or decrease the number of heap subpools to 1. Finally this query did help to diagnose the number of heap subpools: select count(distinct kghluidx) num_subpools from x$kghlu where kghlushrpool = 1; The result was 2 - so we did run the upgrade now with this parameter set: _kghdsidx_count=1 And finally it did work well. One sad thing:After the upgrade did fail Support did recommend to restore the whole database - which took an additional 3-4 hours. As the ORACLE SERVER component has been already upgraded successfully at the stage where the error did happen it would have been fine to go on with the manual upgrade and start catupgrd.sql script. It would have been detected that the ORACLE SERVER is upgraded already and just picked up the non-upgraded components. The good news:Finally I had one extra slide to add to our workshop presentation

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• Ghost in the machine

  - by GrumpyOldDBA

  Well it does relate to ghosts, in this case dbGhost, http://dbghost.com/    which is what this post is about. Ghost creates databases on the fly, something I personally don’t like too much, which it then compares to a “base” database to produce release scripts. ( The brief description ). As with all things sometimes all is not well and the server is left with a number of ghost created databases so I have to have a job to delete these every night before backups, it’s not difficult to code...(read more)

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• Automatic Maintenance Jobs in every PDB? New SPM Evolve Advisor Task in Oracle 12.1.0.2

  - by Mike Dietrich

  A customer checking out our slides from the OTN Tour in August 2014 asked me a finicky question the other day: "According to the documentation the Automatic SQL Tuning Advisor maintenance task gets executed only within the CDB$ROOT, but not within each PDB - but the slides are not clear here. So what is the truth?" Ok, that's good question. In my understanding all tasks will get executed within each PDB - that's why we recommend (based on experience) to break up the default maintenance windows when using Oracle Multitenant. Otherwise all PDBs will have the same maintenance windows, and guess what will happen when 25 PDBs start gathering object statistics at the same time ... The documentation indeed says: Automatic SQL Tuning Advisor data is stored in the root. It might have results about SQL statements executed in a PDB that were analyzed by the advisor, but these results are not included if the PDB is unplugged. A common user whose current container is the root can run SQL Tuning Advisor manually for SQL statements from any PDB. When a statement is tuned, it is tuned in any container that runs the statement. This sounds reasonable. But when we have a look into our PDBs or into the CDB_AUTOTASK_CLIENT view the result is different from what the doc says. In my environment I did create just two fresh empty PDBs (CON_ID 3 and 4): SQL> select client_name, status, con_id from cdb_autotask_client; CLIENT_NAME                           STATUS         CON_ID------------------------------------- ---------- ----------auto optimizer stats collection       ENABLED             1sql tuning advisor                    ENABLED             1auto space advisor                    ENABLED             1auto optimizer stats collection       ENABLED             4sql tuning advisor                    ENABLED             4auto space advisor                    ENABLED             4auto optimizer stats collection       ENABLED             3sql tuning advisor                    ENABLED             3auto space advisor                    ENABLED             3 9 rows selected. I haven't verified the reason why this is different from the docs but it may have been related to one change in Oracle Database 12.1.0.2: The new SPM Evolve Advisor Task ( SYS_AUTO_SPM_EVOLVE_TASK) for automatic plan evolution for SQL Plan Management. This new task doesn't appear as a stand-alone job (client) in the maintenance window but runs as a sub-entity of the Automatic SQL Tuning Advisor task. And (I'm just guessing) this may be one of the reasons why every PDB will have to have its own Automatic SQL Tuning Advisor task  Here you'll find more information about how to enable, disable and configure the new Oracle 12.1.0.2 SPM Evolve Advisor Task: Oracle Database 12.1.0.2 SQL Tuning Guide:Managing the SPM Evolve Advisor Task -Mike

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• The best AutoCAD 2010 Ubuntu alternative?

  - by onvas

  I'm looking for the best AutoCAD 2010 alternative for Ubuntu. Wine's support for the 2010 version isn't polished so I'm looking for Linux based similar programs. I know that this can be subjective so I'd like to know what's the best Ubuntu alternative which has the most similar, and significant features as that of AutoCAD 2010? I'm not familiar with the program because I'm researching this for my sister who is studying Aeronautical Engineering. Any help is appreciated. I'm using 12.04 64-bit on my ThinkPad R61i with 3.8GB memory and 160GB hard drive.

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• UPK at Oracle OpenWorld 2012!

  - by Karen Rihs

  Oracle OpenWorld 2012 September 30 – October 4, 2012 in San Francisco, CA We hope to see you at Oracle OpenWorld this year!  Please see the Focus On User Productivity Kit document for details of the many UPK sessions, hands-on labs, demonstrations, and networking opportunities available to you!  Be sure to stop by one of our two demo pods to say “hello”.  We’d love to hear about how you’re using UPK!

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• Finding the Best Spot in the Microwave [Video]

  - by Jason Fitzpatrick

  Where’s the best spot in the Microwave? In this video we see a neat hands-on demonstration with some LED lights that shows just how the microwave beam in your microwave works. In the above video from Smarter Ever Day they visit the National Electronics Museum and get a first person look at how microwaves work and why nearly every microwave you’ll ever own has a turn table. Best Spot in the Microwave? [YouTube] How to Make and Install an Electric Outlet in a Cabinet or DeskHow To Recover After Your Email Password Is CompromisedHow to Clean Your Filthy Keyboard in the Dishwasher (Without Ruining it)

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• Migration a database from 32bit to 64bit

  - by Mike Dietrich

  Database migrations from an 32bit environment to an 64bit environment keeping the same platform architecture (e.g. moving an Oracle 10.2.0.5 database from MS Windows XP 32bit to MS Windows Server 2003 64bit) does not happen that often anymore. But still we see them getting done. And there are a few things to note when doing such a move. First of all the important question is:Will you upgrade your database as part of this move - Yes or No? If you say "Yes" then you are almost done with that topic as we will take care of that bitnes move during the upgrade. The only thing you have to take care is OLAP in case you are using OLAP Option with Analytic Workspaces (AW) by yourself. Those store data in Binary LOBs - and in order to move AWs from 32bit to 64bit you have to export your AWs prior to the move - and import them later on. People who don't use OLAP don't have to take care on this. But if you say "No" (meaning: no upgrade actions involved - you keep your database version) then you have to make sure to invalidate all packages and stored code in the database before you shutdown your database in the 32bit environment and prior to moving it over. And the same rule as above for OLAP applies once you use the OLAP Option. In the source environment: startup upgrade;    -- [or startup migrate; -- for Oracle 9i] @?/rdbms/admin/utlirp.sqlshutdown immediate In the destination environment: startup upgrade @?/olap/admin/xumuts.plb --Only if OLAP Option is installed@?/rdbms/admin/utlrp.sql The script utlirp.sql will invalidate all packages and stored code, utlrp.sql will recompile - and xumuts.plb will rebuild the OLAP Analytic Workspaces in case you have the OLAP Option installed.

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• Best practice, or generally best way to set up web-hosting server, permissions, etc. [closed]

  - by Jagot

  Hi, I'm about to set up a server upon which a friend and I will be hosting web sites, and I'll be using Debian. I've set up a LAMP solution many times just to using for local testing purposes, but never for actual production use. I was wondering what are the best practices are in terms of setting the server up, in reference specifically to accessing the web root directory. A couple of the options I have seen: Set up a single user account on the server for us both to use and use a virtual host to point to the somewhere in the home directory, e.g. /home/webdev/www. Set each of us up a user account, and grant permissions in some way to /var/www (What would be the best way? Set up a new group?) I want to get this right when I first set this up as there won't be any going back for a while once our first site is up and running. Appreciate any guidance in advance.

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• The Best Websites for Listening to Podcasts and Learning How to Create Your Own

  - by Lori Kaufman

  Podcasts, or webcasts, are shows about many different topics that are broadcast over the web and broken up into parts, or episodes.  You subscribe to podcasts and new episodes are automatically delivered to you as they are released. We’ve collected the best websites for finding many different types of webcasts and for finding resources to help you in creating and producing your own podcasts. In the coming weeks, we will be publishing other articles about the best websites for educating and entertaining yourself online, such as sites for eBooks, audiobooks, movies and TV shows, documentaries, user-made videos, free online courses, news and information, and music (downloads, streaming, and radio). How to Make Your Laptop Choose a Wired Connection Instead of Wireless HTG Explains: What Is Two-Factor Authentication and Should I Be Using It? HTG Explains: What Is Windows RT and What Does It Mean To Me?

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• A follow up to yesterday

  - by GrumpyOldDBA

  As I have been asked,  here to tidy up yesterdays post is the procedure my startup procedure calls along with the logging table deployed in the DBA database. Just to muddy the water further I have routines for remotely calling the DBAMessages table through a remote server to send out email from a central server!! Just to explain that I have been ( previously ) limited to only using one Server to send email alerts for multiple Servers so I attempt to code to deal with all possible circumstances...(read more)

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• Join Us!! Live Webinar: Using UPK for Testing

  - by Di Seghposs

  Create Manual Test Scripts 50% Faster with Oracle User Productivity Kit  Thursday, March 29, 2012 11:00 am – 12:00 pm ET Click here to register now for this informative webinar. Oracle UPK enhances the testing phase of the implementation lifecycle by reducing test plan creation time, improving accuracy, and providing the foundation for reusable training documentation, application simulations, and end-user performance support—all critical assets to support an enterprise application implementation. With Oracle UPK: Reduce manual test plan development time - Accelerate the testing cycle by significantly reducing the time required to create the test plan. Improve test plan accuracy - Capture test steps automatically using Oracle UPK and import those steps directly to any of these testing suites eliminating many of the errors that occur when writing manual tests. Create the foundation for reusable assets - Recorded simulations can be used for other lifecycle phases of the project, such as knowledge transfer for training and support. With its integration to Oracle Application Testing Suite, IBM Rational, and HP Quality Center, Oracle UPK allows you to deploy high-quality applications quickly and effectively by providing a consistent, repeatable process for gathering requirements, planning and scheduling tests, analyzing results, and managing  issues. Join this live webinar and learn how to decrease your time to deployment and enhance your testing plans today! 

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• Is it appropriate to try to control the order of finalization?

  - by Strilanc

  I'm writing a class which is roughly analogous to a CancellationToken, except it has a third state for "never going to be cancelled". At the moment I'm trying to decide what to do if the 'source' of the token is garbage collected without ever being set. It seems that, intuitively, the source should transition the associated token to the 'never cancelled' state when it is about to be collected. However, this could trigger callbacks who were only kept alive by their linkage from the token. That means what those callbacks reference might now in the process of finalization. Calling them would be bad. In order to "fix" this, I wrote this class: public sealed class GCRoot { private static readonly GCRoot MainRoot = new GCRoot(); private GCRoot _next; private GCRoot _prev; private object _value; private GCRoot() { this._next = this._prev = this; } private GCRoot(GCRoot prev, object value) { this._value = value; this._prev = prev; this._next = prev._next; _prev._next = this; _next._prev = this; } public static GCRoot Root(object value) { return new GCRoot(MainRoot, value); } public void Unroot() { lock (MainRoot) { _next._prev = _prev; _prev._next = _next; this._next = this._prev = this; } } } intending to use it like this: Source() { ... _root = GCRoot.Root(callbacks); } void TransitionToNeverCancelled() { _root.Unlink(); ... } ~Source() { TransitionToNeverCancelled(); } but now I'm troubled. This seems to open the possibility for memory leaks, without actually fixing all cases of sources in limbo. Like, if a source is closed over in one of its own callbacks, then it is rooted by the callback root and so can never be collected. Presumably I should just let my sources be collected without a peep. Or maybe not? Is it ever appropriate to try to control the order of finalization, or is it a giant warning sign?

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• Let's do the Time Warp again!

  - by Mike Dietrich

  Once you start reading about Daylight Saving Time changes in MyOracleSupport you'll find still a lot of notes explaining this and that and back and forth. But sometimes there seems to be a bit too much information - and lacking clear instructions. Once a customer called that the "Time Zone Spaghetti" after reading MOS notes about DST for several hours ending up with the note where he has begun to read before still not clear what to do now I'm using usually the scripts from MOS Note:977512.1 as you'll just have to exchange the DST version you are upgrading to and it has everything you need to check and adjust the time zone data in the database - for instance after applying the DST V18 patch to your database's homes. As a reminder to myself when traveling I have stored a copy of the script part of that note here - and please note that this is not an official Oracle version. Always read and check the original MOS Note:977512.1 as it may have gotten changed in between and may contain changes or corrections and as it has a lot of more explainationary information than I could cover here. And credit to Gunter Vermeir from Oracle Support, who is the owner of that MOS Note and has compiled all that useful stuff together. DST_prepare.sql DST_adjust.sql

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• Best Smartphone: iPhone, Android?

  The best smartphone is either the Apple iPhone or the Google Android handset, according to a recent user survey.

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• MySQL: Best of Breed Database

  - by Bertrand Matthelié

  Oracle offers best of breed technology at every layer of the stack, from servers and storage to applications. Discover why MySQL is a best of breed database solution for: Web-based applications, including the next generation of highly demanding web, cloud, mobile and social application Distributed applications requiring a powerful and reliable embedded database Custom and departmental enterprise applications on Windows and other platforms Check out our Resource Center to get access to white papers and other resources. And, remember to register for MySQL Connect if you haven’t done so yet. You can still save US$ 300 over the on-site fee – Register Now!

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• Best Graphics card (Setup) for three, high-res monitors attached to desktop

  - by nomrasco

  I have been looking around a little bit, but most of the discussions are about problems with already existing systems (particular graphics card and setup etc.). I would like to ask what would be the best option for me if I want to build powerful desktop with triple monitor setup. I have one Dell UltraSharp U2713HM (27 inches, 2560x1440) and I was thinking about getting two more. Would it be possible to have those three working with ubuntu (kubuntu) on any graphics card out there today? What is the best option if it comes to choosing particular model? Should I use proprietary drivers or some open sourced ones? I am not a gamer. I mostly develop on my machines and running some computational tasks, but I would rather like to spend some more money and have setup where I don't see any lags :) thank You very much in advance! Darek

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