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  • Entity Framework Code First: Get Entities From Local Cache or the Database

    - by Ricardo Peres
    Entity Framework Code First makes it very easy to access local (first level) cache: you just access the DbSet<T>.Local property. This way, no query is sent to the database, only performed in already loaded entities. If you want to first search local cache, then the database, if no entries are found, you can use this extension method: 1: public static class DbContextExtensions 2: { 3: public static IQueryable<T> LocalOrDatabase<T>(this DbContext context, Expression<Func<T, Boolean>> expression) where T : class 4: { 5: IEnumerable<T> localResults = context.Set<T>().Local.Where(expression.Compile()); 6:  7: if (localResults.Any() == true) 8: { 9: return (localResults.AsQueryable()); 10: } 11:  12: IQueryable<T> databaseResults = context.Set<T>().Where(expression); 13:  14: return (databaseResults); 15: } 16: }

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  • Des chercheurs découvrent le premier malware à pratiquer l'overwrite, caché sous la forme d'un Adobe

    Des chercheurs découvrent le premier malware à pratiquer l'overwrite, caché sous la forme d'un Adobe Updater Un code malicieux vient d'être repéré pour la première fois par des spécialistes en sécurité informatique. En effet, des chercheurs viennent de découvrir un malware qui se substitue aux mises à jour de certaines applications. Habituellement, ce type de programmes ne pratique pas l'overwrite. Seuls les ordinateurs tournant sous Windows sont touchés. Le malware se cache sous la forme d'un updater pour les produits Adobe ou Java. Une variante imite Adobe Reader v.9 et overwrite AdobeUpdater.exe, lequel a pour mission de se connecter régulièrement auprès des serveurs d'Adobe pour vérifier si une nouvelle version ...

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  • How do I speed up and cache mmap file access over NFS on Linux?

    - by Zan Lynx
    The server and client are both 64-bit Ubuntu 10.04 LTS. The application in question is a custom app that uses mmap() for fast random file access. Its ideal state is when the entire file is cached in RAM. The network connections are really fast 10Gb Ethernet. It is a virtual server blade setup. It isn't the network connections slowing things down because everything performs superbly when using a virtual disk (iSCSI to the SAN). But when we run the application on a NFS home directory mount, performance goes to the dogs. It appears that the Linux kernel isn't caching anything. So it is reading every single disk block needed by mmap() accesses over and over and over again. The NFS mount is done through autofs, which has only default settings. /proc/mounts shows the NFS mount is done with the following options: rw,relatime,vers=3,rsize=131072,wsize=131072,namlen=255,hard,proto=tcp,timeo=600,retrans=2,sec=sys,mountaddr=192.168.11.52,mountvers=3,mountproto=tcp,addr=192.168.11.52 How can I make Ubuntu 10.04 cache the file instead of reloading it all the time?

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  • Tagging Objects in the AppFabric Cache

    In two of my previous entries I outlined functionality and patterns used in the AppFabric Cache.  In this entry I wanted to expand and look at another area of functionality that people have come to expect when working with cache technology.  This expectation is the ability to tag content with more information than just the key.  As you start to examine this expectation you will soon find yourself asking if the tagged data can be related to each other and finally if it is possible...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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  • Skipping nginx PHP cache for certain areas of a site?

    - by DisgruntledGoat
    I have just set up a new server with nginx (which I am new to) and PHP. On my site there are essentially 3 different types of files: static content like CSS, JS, and some images (most images are on an external CDN) main PHP/MySQL database-driven website which essentially acts like a static site dynamic PHP/MySQL forum It is my understanding from this question and this page that the static files need no special treatment and will be served as fast as possible. I followed the answer from the above question to set up caching for PHP files and now I have a config like this: location ~ \.php$ { try_files $uri =404; fastcgi_cache one; fastcgi_cache_key $scheme$host$request_uri; fastcgi_cache_valid 200 302 304 30m; fastcgi_cache_valid 301 1h; include /etc/nginx/fastcgi_params; fastcgi_pass unix:/var/run/php-fastcgi/php-fastcgi.socket; fastcgi_index index.php; fastcgi_param SCRIPT_FILENAME /srv/www/example$fastcgi_script_name; fastcgi_param HTTPS off; } However, now I want to prevent caching on the forum (either for everyone or only for logged-in users - haven't checked if the latter is feasible with the forum software). I've heard that "if is evil" inside location blocks, so I am unsure how to proceed. With the if inside the location block I would probably add this in the middle: if ($request_uri ~* "^/forum/") { fastcgi_cache_bypass 1; } # or possible this, if I'm able to cache pages for anonymous visitors if ($request_uri ~* "^/forum/" && $http_cookie ~* "loggedincookie") { fastcgi_cache_bypass 1; } Will that work fine, or is there a better way to achieve this?

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  • How to delete Chrome temp data (history, cookies, cache) using command line

    - by Dio Phung
    On Windows 7, I tried running this script but still cannot clear Chrome temp data. Can someone figure out what's wrong with the script? Where do Chrome store history and cache ? Thanks ECHO -------------------------------------- ECHO **** Clearing Chrome cache taskkill /F /IM "chrome.exe">nul 2>&1 set ChromeDataDir=C:\Users\%USERNAME%\AppData\Local\Google\Chrome\User Data\Default set ChromeCache=%ChromeDataDir%\Cache>nul 2>&1 del /q /s /f "%ChromeCache%\*.*">nul 2>&1 del /q /f "%ChromeDataDir%\*Cookies*.*">nul 2>&1 del /q /f "%ChromeDataDir%\*History*.*">nul 2>&1 set ChromeDataDir=C:\Users\%USERNAME%\Local Settings\Application Data\Google\Chrome\User Data\Default set ChromeCache=%ChromeDataDir%\Cache>nul 2>&1 del /q /s /f "%ChromeCache%\*.*">nul 2>&1 del /q /f "%ChromeDataDir%\*Cookies*.*">nul 2>&1 del /q /f "%ChromeDataDir%\*History*.*">nul 2>&1 ECHO **** Clearing Chrome cache DONE

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  • AppFabric named cache, what happens if you lose a cache host?

    - by Liam
    I'm getting my head around how app fabric clustering works and there's something I'm not sure about. Given a structure where we have one named cache, with two lead hosts and (say) three cache hosts and high availability turned off and the lead host(s) performing the management role. When one cache host goes down do you loose the data that was on that cache host? In this MSDN article it states: Data on the non-lead hosts would be lost (assuming high availability was not enabled), but the rest of the cluster could continue serving and storing data But I was unsure if redundancy is built into the system. Would you loose x amount of data or would one of the other cache hosts store this data also and pick up the slack?

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  • Infinispan equivalent to ehcache's copyOnRead and copyOnWrite

    - by waxwing
    Hi, I am planning to implement a cache solution into an existing web app. Nothing complicated: basically a concurrent map that supports overflowing to disk and automatic eviction. Clustering the cache could be requirement in the future, but not now. I like ehcache's copyOnRead and copyOnWrite features, because it means that I don't have to manually clone things before modifying something I take out of the cache. Now I have started to look at Infinispan, but I have not found anything equivalent there. Does it exist? I.e., the following unit tests should pass: @Test public void testCopyOnWrite() { Date date = new Date(0); cache.put(0, date); date.setTime(1000); date = cache.get(0); assertEquals(0, date.getTime()); } @Test public void testCopyOnRead() { Date date = new Date(0); cache.put(0, date); assertNotSame(cache.get(0), cache.get(0)); }

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  • Java Caching on distributed environment

    - by Naren
    Hi, I am supposed to create a simple replicated cache using java for internal purpose which will be used in a distributed environment. I have seen oracle has implemented Replicated Cache Service. http://wiki.tangosol.com/display/COH32UG/Replicated+Cache+Service The problem I am facing is while doing an update or remove, I acquire lock on other cache's to the point the cache get's updated and notifies others of the change. This is eventually going into a dead lock situation, while removing. Is there any strategy I should follow while updating or removing from cache's. Can I implement a replicated cache without having a primary cache?? Thanks, Naren

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  • wanting a good memory + disk caching solution

    - by brofield
    I'm currently storing generated HTML pages in a memcached in-memory cache. This works great, however I am wanting to increase the storage capacity of the cache beyond available memory. What I would really like is: memcached semantics (i.e. not reliable, just a cache) memcached api preferred (but not required) large in-memory first level cache (MRU) huge on-disk second level cache (main) evicted from on-disk cache at maximum storage using LRU or LFU proven implementation In searching for a solution I've found the following solutions but they all miss my marks in some way. Does anyone know of either: other options that I haven't considered a way to make memcachedb do evictions Already considered are: memcachedb best fit but doesn't do evictions: explicitly "not a cache" can't see any way to do evictions (either manual or automatic) tugela cache abandoned, no support don't want to recommend it to customers nmdb doesn't use memcache api new and unproven don't want to recommend it to customers

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  • Limit size of cache directory.

    - by M.A. Cape
    I have some questions about the cache directory in android. Does anyone knows the limit for each app's cache directory? Also what will happen if there is not enough disk space to cache data? All I know is when the device runs low on storage, the files here (cache directory)will be the ones that get deleted first and each app has its own cache directory. Now, are the files of other app's cache directory will be cleared to accommodate my app's request to add files in the cache dir when there is not enough storage?

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  • Are there any nasty side affects if i lock the HttpContext.Current.Cache.Insert method

    - by Ekk
    Apart from blocking other threads reading from the cache what other problems should I be thinking about when locking the cache insert method for a public facing website. The actual data retrieval and insert into the cache should take no more than 1 second, which we can live with. More importantly i don't want multiple thread potentially all hitting the Insert method at the same time. The sample code looks something like: public static readonly object _syncRoot = new object(); if (HttpContext.Current.Cache["key"] == null) { lock (_syncRoot) { HttpContext.Current.Cache.Insert("key", "DATA", null, DateTime.Now.AddMinutes(5), Cache.NoSlidingExpiration, CacheItemPriority.Normal, null); } } Response.Write(HttpContext.Current.Cache["key"]);

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  • Strategies for generating Zend Cache Keys

    - by emeraldjava
    ATM i'm manually generating a cache key based on the method name and parameters, then follow to the normal cache pattern. This is all done in the Controller and i'm calling a model class that 'extends Zend_Db_Table_Abstract'. public function indexAction() { $cache = Zend_Registry::get('cache'); $individualleaguekey = sprintf("getIndividualLeague_%d_%s",$leagueid,$division->code); if(!$leaguetable = $cache->load($individualleaguekey)) { $table = new Model_DbTable_Raceresult(); $leaguetable = $table->getIndividualLeague($leagueid,$division,$races); $cache->save($leaguetable, $individualleaguekey); } $this->view->leaguetable = $leaguetable; .... I want to avoid the duplication of parameters to the cache creation method and also to the model method, so i'm thinking of moving the caching logic away from my controller class and into model class packaged in './model/DbTable', but this seems incorrect since the DB model should only handle SQL operations. Any suggestions on how i can implement a clean patterned solution?

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  • What is safe to exclude for a full system backup?

    - by seb
    Hi, I'm looking for a list which paths/files are safe to exclude for a full system/home backup. Considering that I have a list of installed packages. /home/*/.thumbnails /home/*/.cache /home/*/.mozilla/firefox/*.default/Cache /home/*/.mozilla/firefox/*.default/OfflineCache /home/*/.local/share/Trash /home/*/.gvfs/ /tmp/ /var/tmp/ not real folders but can cause severe problems when 'restoring' /dev /proc /sys What about... /var/ in general? /var/backups/ - can get quite large /var/log/ - does not require much space and can help for later comparison /lost+found/

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  • MINSCN?Cache Fusion Read Consistent

    - by Liu Maclean(???)
    ????? ???Ask Maclean Home ???  RAC ? Past Image PI????, ?????????,???11.2.0.3 2 Node RAC??????????: SQL> select * from v$version; BANNER -------------------------------------------------------------------------------- Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production PL/SQL Release 11.2.0.3.0 - Production CORE 11.2.0.3.0 Production TNS for Linux: Version 11.2.0.3.0 - Production NLSRTL Version 11.2.0.3.0 - Production SQL> select * from global_name; GLOBAL_NAME -------------------------------------------------------------------------------- www.oracledatabase12g.com SQL> drop table test purge; Table dropped. SQL> alter system flush buffer_cache; System altered. SQL> create table test(id number); insert into test values(1); insert into test values(2); commit; /* ???? rowid??TEST????2????????? */ select dbms_rowid.rowid_block_number(rowid),dbms_rowid.rowid_relative_fno(rowid) from test; DBMS_ROWID.ROWID_BLOCK_NUMBER(ROWID) DBMS_ROWID.ROWID_RELATIVE_FNO(ROWID) ------------------------------------ ------------------------------------                                89233                                    1                                89233                                    1 SQL> alter system flush buffer_cache; System altered. Instance 1 Session A ??UPDATE??: SQL> update test set id=id+1 where id=1; 1 row updated. Instance 1 Session B ??x$BH buffer header?? ?? ??Buffer??? SQL> select state,cr_scn_bas from x$bh where file#=1 and dbablk=89233 and state!=0;      STATE CR_SCN_BAS ---------- ----------          1          0          3    1227595 X$BH ??? STATE????Buffer???, ???????: STATE NUMBER KCBBHFREE 0 buffer free KCBBHEXLCUR 1 buffer current (and if DFS locked X) KCBBHSHRCUR 2 buffer current (and if DFS locked S) KCBBHCR 3 buffer consistant read KCBBHREADING 4 Being read KCBBHMRECOVERY 5 media recovery (current & special) KCBBHIRECOVERY 6 Instance recovery (somewhat special) ????????????? : state =1 Xcurrent ? state=2 Scurrent ? state=3 CR ??? Instance 2  ?? ????????????? ,???? gc current block 2 way  ??Current Block ??? Instance 2, ?? Instance 1 ??”Current Block” Convert ? Past Image: Instance 2 Session C SQL> update test set id=id+1 where id=2; 1 row updated. Instance 2 Session D SQL> select state,cr_scn_bas from x$bh where file#=1 and dbablk=89233 and state!=0; STATE CR_SCN_BAS ---------- ---------- 1 0 3 1227641 3 1227638 STATE =1 ?Xcurrent block???? Instance 2 , ??? Instance 1 ??? GC??: Instance 1 Session B SQL> select state,cr_scn_bas from x$bh where file#=1 and dbablk=89233 and state!=0;      STATE CR_SCN_BAS ---------- ----------          3    1227641          3    1227638          8          0          3    1227595 ???????, ??????Instance 1??session A????TEST??SELECT??? ,????? 3? State=3?CR ? ??????1?: Instance 1 session A ?????UPDATE? session SQL> alter session set events '10046 trace name context forever,level 8:10708 trace name context forever,level 103: trace[rac.*] disk high'; Session altered. SQL> select * from test;         ID ----------          2          2 select state,cr_scn_bas from x$bh where file#=1 and dbablk=89233 and state!=0;       STATE CR_SCN_BAS ---------- ----------          3    1227716          3    1227713          8          0 ?????????v$BH ????CR????,?????SELECT??? CR????????,???????? ?????????? ??X$BH?????? , ?????CR??SCN Version???: 1227641?1227638?1227595, ?SELECT?????? 2???SCN version?CR? 1227716? 1227713 ???, Oracle????????? ?????????SELECT??????event 10708? rac.*???TRACE,??????TRACE??: PARSING IN CURSOR #140444679938584 len=337 dep=1 uid=0 oct=3 lid=0 tim=1335698913632292 hv=3345277572 ad='bc0e68c8' sqlid='baj7tjm3q9sn4' SELECT /* OPT_DYN_SAMP */ /*+ ALL_ROWS IGNORE_WHERE_CLAUSE NO_PARALLEL(SAMPLESUB) opt_param('parallel_execution_enabled', 'false') NO_PARALLEL_INDEX(SAMPLESUB) NO_SQL_TUNE */ NVL(SUM(C1),0), NVL(SUM(C2),0) FROM (SELECT /*+ NO_PARALLEL("TEST") FULL("TEST") NO_PARALLEL_INDEX("TEST") */ 1 AS C1, 1 AS C2 FROM "SYS"."TEST" "TEST") SAMPLESUB END OF STMT PARSE #140444679938584:c=1000,e=27630,p=0,cr=0,cu=0,mis=1,r=0,dep=1,og=1,plh=1950795681,tim=1335698913632252 EXEC #140444679938584:c=0,e=44,p=0,cr=0,cu=0,mis=0,r=0,dep=1,og=1,plh=1950795681,tim=1335698913632390 *** 2012-04-29 07:28:33.632 kclscrs: req=0 block=1/89233 *** 2012-04-29 07:28:33.632 kclscrs: bid=1:3:1:0:7:80:1:0:4:0:0:0:1:2:4:1:26:0:0:0:70:1a:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:4:3:2:1:2:0:3f:0:1c:86:2d:4:0:0:0:0:a2:3c:7c:b:70:1a:0:0:0:0:1:0:7a:f8:76:1d:1:2:dc:5:a9:fe:17:75:0:0:0:0:0:0:0:0:0:0:0:0:63:e5:0:0:0:0:0:0:10:0:0:0 2012-04-29 07:28:33.632578 : kjbcrc[0x15c91.1 76896.0][9] 2012-04-29 07:28:33.632616 : GSIPC:GMBQ: buff 0xba1e8f90, queue 0xbb79f278, pool 0x60013fa0, freeq 1, nxt 0xbb79f278, prv 0xbb79f278 2012-04-29 07:28:33.632634 : kjbmscrc(0x15c91.1)seq 0x2 reqid=0x1c(shadow 0xb4bb4458,reqid x1c)mas@2(infosz 200)(direct 1) 2012-04-29 07:28:33.632654 : kjbsentscn[0x0.12bbc1][to 2] 2012-04-29 07:28:33.632669 : GSIPC:SENDM: send msg 0xba1e9000 dest x20001 seq 24026 type 32 tkts xff0000 mlen x17001a0 2012-04-29 07:28:33.633385 : GSIPC:KSXPCB: msg 0xba1e9000 status 30, type 32, dest 2, rcvr 1 *** 2012-04-29 07:28:33.633 kclwcrs: wait=0 tm=689 *** 2012-04-29 07:28:33.633 kclwcrs: got 1 blocks from ksxprcv WAIT #140444679938584: nam='gc cr block 2-way' ela= 689 p1=1 p2=89233 p3=1 obj#=76896 tim=1335698913633418 2012-04-29 07:28:33.633490 : kjbcrcomplete[0x15c91.1 76896.0][0] 2012-04-29 07:28:33.633510 : kjbrcvdscn[0x0.12bbc1][from 2][idx 2012-04-29 07:28:33.633527 : kjbrcvdscn[no bscn <= rscn 0x0.12bbc1][from 2] *** 2012-04-29 07:28:33.633 kclwcrs: req=0 typ=cr(2) wtyp=2hop tm=689 ??TRACE???? ?????????TEST??????, ???????Dynamic Sampling?????,???????TEST?? CR???,???????’gc cr block 2-way’ ??: 2012-04-29 07:28:33.632654 : kjbsentscn[0x0.12bbc1][to 2] 12bbc1= 1227713  ???X$BH????CR???,kjbsentscn[0x0.12bbc1][to 2] ????? ? Instance 2 ???SCN=12bbc1=1227713   DBA=0x15c91.1 76896.0 ?  CR Request(obj#=76896) ??kjbrcvdscn????? [no bscn <= rscn 0x0.12bbc1][from 2] ,??? ??receive? SCN Version =12bbc1 ???Best Version CR Server Arch ??????????????????SELECT??: PARSING IN CURSOR #140444682869592 len=18 dep=0 uid=0 oct=3 lid=0 tim=1335698913635874 hv=1689401402 ad='b1a188f0' sqlid='c99yw1xkb4f1u' select * from test END OF STMT PARSE #140444682869592:c=4999,e=34017,p=0,cr=7,cu=0,mis=1,r=0,dep=0,og=1,plh=1357081020,tim=1335698913635870 EXEC #140444682869592:c=0,e=23,p=0,cr=0,cu=0,mis=0,r=0,dep=0,og=1,plh=1357081020,tim=1335698913635939 WAIT #140444682869592: nam='SQL*Net message to client' ela= 7 driver id=1650815232 #bytes=1 p3=0 obj#=0 tim=1335698913636071 *** 2012-04-29 07:28:33.636 kclscrs: req=0 block=1/89233 *** 2012-04-29 07:28:33.636 kclscrs: bid=1:3:1:0:7:83:1:0:4:0:0:0:1:2:4:1:26:0:0:0:70:1a:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:0:4:3:2:1:2:0:2:0:1c:86:2d:4:0:0:0:0:a2:3c:7c:b:70:1a:0:0:0:0:1:0:7d:f8:76:1d:1:2:dc:5:a9:fe:17:75:0:0:0:0:0:0:0:0:0:0:0:0:63:e5:0:0:0:0:0:0:10:0:0:0 2012-04-29 07:28:33.636209 : kjbcrc[0x15c91.1 76896.0][9] 2012-04-29 07:28:33.636228 : GSIPC:GMBQ: buff 0xba0e5d50, queue 0xbb79f278, pool 0x60013fa0, freeq 1, nxt 0xbb79f278, prv 0xbb79f278 2012-04-29 07:28:33.636244 : kjbmscrc(0x15c91.1)seq 0x3 reqid=0x1d(shadow 0xb4bb4458,reqid x1d)mas@2(infosz 200)(direct 1) 2012-04-29 07:28:33.636252 : kjbsentscn[0x0.12bbc4][to 2] 2012-04-29 07:28:33.636358 : GSIPC:SENDM: send msg 0xba0e5dc0 dest x20001 seq 24029 type 32 tkts xff0000 mlen x17001a0 2012-04-29 07:28:33.636861 : GSIPC:KSXPCB: msg 0xba0e5dc0 status 30, type 32, dest 2, rcvr 1 *** 2012-04-29 07:28:33.637 kclwcrs: wait=0 tm=865 *** 2012-04-29 07:28:33.637 kclwcrs: got 1 blocks from ksxprcv WAIT #140444682869592: nam='gc cr block 2-way' ela= 865 p1=1 p2=89233 p3=1 obj#=76896 tim=1335698913637294 2012-04-29 07:28:33.637356 : kjbcrcomplete[0x15c91.1 76896.0][0] 2012-04-29 07:28:33.637374 : kjbrcvdscn[0x0.12bbc4][from 2][idx 2012-04-29 07:28:33.637389 : kjbrcvdscn[no bscn <= rscn 0x0.12bbc4][from 2] *** 2012-04-29 07:28:33.637 kclwcrs: req=0 typ=cr(2) wtyp=2hop tm=865 ???, “SELECT * FROM TEST”??????’gc cr block 2-way’??:2012-04-29 07:28:33.637374 : kjbrcvdscn[0x0.12bbc4][from 2][idx 2012-04-29 07:28:33.637389 : kjbrcvdscn[no bscn ??Foreground Process? Remote LMS??got?? SCN=1227716 Version?CR, ??? ?????X$BH ?????scn??? ??????????Instance 1????2?SCN???CR?, ???????????Instance 1 Buffer Cache?? ??SCN Version ???CR ??????? ?????????: SQL> alter system set "_enable_minscn_cr"=false scope=spfile; System altered. SQL> alter system set "_db_block_max_cr_dba"=20 scope=spfile; System altered. SQL> startup force; ORA-32004: obsolete or deprecated parameter(s) specified for RDBMS instance ORACLE instance started. Total System Global Area 1570009088 bytes Fixed Size 2228704 bytes Variable Size 989859360 bytes Database Buffers 570425344 bytes Redo Buffers 7495680 bytes Database mounted. Database opened. ???? “_enable_minscn_cr”=false ? “_db_block_max_cr_dba”=20 ???RAC????, ??????: ?Instance 2 Session C ?update??????? ?????Instance 1 ????? ,????Instance 1?Request CR SQL> update test set id=id+1 where id=2; -- Instance 2 1 row updated. SQL> select * From test; -- Instance 1 ID ---------- 1 2 ??? Instance 1? X$BH?? select state,cr_scn_bas from x$bh where file#=1 and dbablk=89233 and state!=0;  STATE CR_SCN_BAS ---------- ---------- 3 1273080 3 1273071 3 1273041 3 1273039 8 0 SQL> update test set id=id+1 where id=3; 1 row updated. SQL> select * From test; ID ---------- 1 2 SQL> select state,cr_scn_bas from x$bh where file#=1 and dbablk=89233 and state!=0; STATE CR_SCN_BAS ---------- ---------- 3 1273091 3 1273080 3 1273071 3 1273041 3 1273039 8 0 ................... SQL> select state,cr_scn_bas from x$bh where file#=1 and dbablk=89233 and state!=0; STATE CR_SCN_BAS ---------- ---------- 3 1273793 3 1273782 3 1273780 3 1273769 3 1273734 3 1273715 3 1273691 3 1273679 3 1273670 3 1273643 3 1273635 3 1273623 3 1273106 3 1273091 3 1273080 3 1273071 3 1273041 3 1273039 3 1273033 19 rows selected. SQL> select state,cr_scn_bas from x$bh where file#=1 and dbablk=89233 and state!=0; STATE CR_SCN_BAS ---------- ---------- 3 1274993 ????? ???? “_enable_minscn_cr”(enable/disable minscn optimization for CR)=false ? “_db_block_max_cr_dba”=20 (Maximum Allowed Number of CR buffers per dba) 2? ??? ????? Instance 1 ??????????? ?? 19????CR?? “_enable_minscn_cr”?11g??????????,???Oracle????CR????SCN,?Foreground Process Receive????????????(SCN??)?SCN Version CR Block??????CBC?? SCN??????CR? , ?????????Buffer Cache??????? ????SCN Version?CR????,????? ?????????? ?????Snap_Scn ?? SCN?? ?????????Current SCN, ??????CR??????????????????????, ????Buffer Cache? ?????????? CR?????????, ?????? “_db_block_max_cr_dba” ???????, ???????????20 ,??????Buffer Cache?????19????CR?; ???”_db_block_max_cr_dba” ???????6 , ?????Buffer cache????????CR ???????6?? ??”_enable_minscn_cr” ??CR???MINSCN ??????, ?????????CR???????, ????? Foreground Process??????CR Request , ?? Holder Instance LMS ?build?? BEST CR ??, ?????????

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  • "No caching mode page present" when USB flash disk attached

    - by evgeny9
    When attaching a USB flash disk (NTFS formatted) to a laptop with Ubuntu Server 12.04 on board, I get following messages: [ 3572.355603] sd 2:0:0:0: [sdb] No Caching mode page present [ 3572.355640] sd 2:0:0:0: [sdb] Assuming drive cache: write through [ 3572.361599] sd 2:0:0:0: [sdb] No Caching mode page present [ 3572.361636] sd 2:0:0:0: [sdb] Assuming drive cache: write through I get them right in the terminal, so that I should press Ctrl+C to proceed with working (entering commands). Is it normal or do I have to setup Caching mode somehow? Thank you.

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  • ???????????I/O?SSD????!

    - by Yusuke.Yamamoto
    ????? ??:2010/11/25 ??:???? ?????????????????????I/O???????????????? Oracle Database 11g Release 2 ?????Database Smart Flash Cache?????????????????????????????????????????????????????? ???????????????????SSD????????????"?????(??)"???????????????????? Database Smart Flash Cache ???OLTP??+?????????????????OLTP??+OLTP???10????????? ????????? ????????????????? http://oracletech.jp/products/pickup/000076.html

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  • How do I fix a corrupt calendar cache?

    - by Blacklight Shining
    I was tailing /var/log/system.log and noticed a sudden wall of text. Looking closer, I saw it was an error CalendarAgent got while trying to save something: Nov 18 11:42:45 rainbow-dash.local CalendarAgent[12321]: CoreData: error: (11) Fatal error. The database at /Users/blackl/Library/Calendars/Calendar Cache is corrupted. SQLite error code:11, 'database disk image is malformed' Nov 18 11:42:45 rainbow-dash.local CalendarAgent[12321]: Core Data: annotation: -executeRequest: encountered exception = Fatal error. The database at /Users/blackl/Library/Calendars/Calendar Cache is corrupted. SQLite error code:11, 'database disk image is malformed' with userInfo = { NSFilePath = "/Users/blackl/Library/Calendars/Calendar Cache"; NSSQLiteErrorDomain = 11; } 2 messages repeated several times Nov 18 11:42:49 rainbow-dash.local CalendarAgent[12321]: [com.apple.calendar.store.log.subscription] [WARNING: CalSubscriptionSession :: persistError :: save failed] This entire sequence is repeated many times throughout the log. file said the file in question was a SQLite 3.x database, so I did a bit of searching and came up with a way to check those. blackl% cp -i ~/Library/Calendars/Calendar\ Cache /tmp blackl% sqlite3 /tmp/Calendar\ Cache SQLite version 3.7.12 2012-04-03 19:43:07 Enter ".help" for instructions Enter SQL statements terminated with a ";" sqlite> pragma integrity_check ; *** in database main *** Main freelist: Bad ptr map entry key=863 expected=(2,0) got=(5,21) On page 21 at right child: 2nd reference to page 863 This is followed by a few dozen lines like these: rowid <number> missing from index <name> and then: wrong # of entries in index <name> I'm at a bit of a loss as to what to do now—I couldn't find anything on how to fix the errors that I found. Also, it would probably be a good idea to disable Calendar Agent so it doesn't try to use the database while it's being fixed (that's why I copied it to /tmp before running sqlite3 on it.) How do I disable CalendarAgent and fix its cache?

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  • What is the best practice to cache images on Android?

    - by barmaleikin
    Hi guys, In my application I use SoftReference to cache images, it is working fine with active internet connection. And now I need to cache images, so I could use it in offline mode. What is the best way to implement it? Use complex solution with SoftReference and database? or maybe SoftReference and local storage (sdcard)? I would appreciate your advices. Thanks.

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