Problem with PRAGMA NO-CACHE

Hi,
          I am having the following problem. Any help is greatly appreciated.
          I have a servlet which in its doPost method says..
          response.setHeader ("Pragma", "no-cache");
          The browser gets this page. Then the user goes from this page to another
          page.
          When the user then uses the "Back" button of the browser, the browser
          does not show a "Warning: This page has expired". Instead it displays the
          original page
          that the servlet had sent.
          My servlet works fine with WebSphere but not with WebLogic 4.5.1 and 5.1
          Anybody encounter this problem before?
          Am I doing something wrong? Do I need to do something extra for Weblogic so
          that
          the page does not get cached?
          Thanks,
          Ullas.
          ([email protected])

You try to delete the cache and retry once again. If this not solves your probelm then follow this url:
Inconsistant Cache (SXI_CACHE)
Cache Refresh
---Mohan

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Currently we display the current date (portal smart link) in the top region of each portal page. We have been having problems with the date not refreshing, rather old pages continue to be served up. I set up a database job using wvuxtil to send an XML document to invalidate all documents in the web cache under root at midnight. (The caching of every portal page is set to "content and definiton at system level" for 1440 min). This morning, the job ran but when checking the pages from a client machine, the date still displayed as yesterday's for SOME of the pages (not all)- clearing the clients IE cache made no difference. Logging on to the server, I accessed the relevant pages displaying yesterday's date on the client - and they showed the correct date on the server. Going back to the client machine, the dates are now correct ? Help anyone ? What should I be checking/looking at next ?
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Weblogic 8.1 SP2 + Sybase: Problem with Insufficient Procedure Cache Memory

Hi all,
Our Weblogic server(8.1, SP2) encountered a problem this week.
It connects to Sybase.
For a particular database query (which involves temporary tables), the DB seems to have run out of "Procedure Cache memory". And as a result, has thrown an exception.
What is a bit wierd is that, the Weblogic, slowly, seems to have exhausted all its DB resources, and all the subsequent database queries (even the simple ones) have failed due to some error or the other.
The weblogic required a re-start for it to acquire back its DB resources.
Has somebody faced a similar problem before, please?
On reading the Release Notes for WLS: 8.1, I see that the Service Packs SP4, SP5 seem to have a few bug fixes related to memory leaks (especially, in case a Prepared statement failed).
[Related CRs are CR233948, CR179600, CR183190].
Does this mean that an Upgrade to 8.1: SP5 or maybe even SP6 help, please?
Would welcome any kind of advice/suggestions.
Thanks you!!!!
Rhishi.

Rhishikesh Anandamoorthy wrote:
Hi Joe,
Thanks a lot for your reply.
I should have mentioned in my previous post that the DBA had indeed recommended
an increase to the Sybase's Procedure Cache Memory size. (We have a separate
DBA team out here, and I do not have DBA access to my database).
But I am a bit apprehensive on two counts:
1. From the DB logs, I see that the query which seems to have failed is something
which is fired day in and day out (though this involves the usage of temporary tables,
which might have filled up the Cache). I should also add that the "DB statistics" was
also being run (automatically) about the same time when the query failed. But again,
the "DB statistics" is run everyday. So, cant see much of a problem here.Nevertheless, it is an internal DBMS issue.
2. The CR179600 and CR183190 of the Weblogic Release Notes suggests that: "Under
certain statement failure conditions, cached statements are leaked without being
closed, which can lead to DBMS resource problems."
So, I am just wondering if this is indeed the actual cause. If so, it might mean
that there is a chance, though slight, that the problem might re-occur.
There seems to be a fix for this in SP5.I certainly advocate upgrading to 81sp6, but that issue had to do with Oracle,
which retains DBMS 'cursors' for each open prepared statement. This will have
no effect on a Sybase DBMS.
I can certainly upgrade to SP6. But, the application seems to have been pretty
stable with SP2 for the past 4 years.
I understand that an upgrade to SP6 may not be such a big change. But, it would
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And the webapp which the server supports is very critical to our customer
[which webapp is not? :-) ], and a server-restart again for this issue would
certainly not be acceptable.
So, would want to be doubly sure, if an upgrade is indeed the right way out.
Thank you!!!
Rhishi.In that case, I would stay comfortable with SP2 if you like. In my professional
opinion, at this time, it is a purely DBMS-side issue, based on the current
evidence. Note that the same WLS was fine for these same previous years. The
problem may have to do with a gradual or recent change in the load or size of
the DBMS.
Joe Weinstein at BEA Systems ( nee [email protected] 1988-1996 )

Problems with increasing/decreasing cache size when live

Hello,
I have configured multiple environments which I'm compacting sequentially and to achieve this I allocate a bigger cache to the env currently being compacted as follows:
Initialization:
DB_ENV->set_cachesize(gbytes, bytes, 1); // Initial cache size.
DB_ENV->set_cache_max(gbytes, bytes); // Maximum size.
While live, application decreases cache of current env when finished and then increases cache of next env using:
DB_ENV->set_cachesize(gbytes, obytes, 0); // Decrease cache size of current env to initial size
DB_ENV->set_cachesize(gbytes, obytes, 0); // Increase cache size of next env to max size.
When I print statistics about the memory pool using DB_ENV->memp_stat I can see that everyting is going normally:
memp_stat: env1 ncache= 8 cache_size=20973592 // env1 is current env
memp_stat: env2 ncache= 1 cache_size=20973592
and then after changing current env:
memp_stat: env1 ncache= 1 cache_size=20973592
memp_stat: env2 ncache= 8 cache_size=20973592 // env2 is now current env
But the problem is that over time memory is leaked (as if the extra memory of each env was not freed) and I'm totally sure that the problem comes from this code.
I'm running Berkeley DB 4.7.25 on FreeBSD.
Maybe some leak was fixed in newer versions and you could suggest to me a patch? or I don't use the API correctly?
Thanks!
Edited by: 894962 on Jan 23, 2012 6:40 AM

Hi,
Thanks for providing the information.
Unfortunately, I don't remember exact test case I was doing, so I did a new one with 32 env.
I set the following for each env:
- Initial cache=512MB/32
- Max=1GB
Before open, I do:
DBEnvironment->set_cachesize((u_int32_t)0, (u_int32_t)512*1024*1024/32, 1);
DBEnvironment->set_cache_max(1*1024*1024*1024, 0);
DBEnvironment->get_cache_max(&gbytes, &obytes); // gives gbytes=1 and obytes=0
After open, I have the following:
DBEnvironment->get_cache_max(&gbytes, &obytes); // gives gbytes=0 and obytes=9502720
memp_stat: cache_size=18644992 cache_ncache=1
So here, the values returned by memp_stat are normal but get_cache_max is strange. Then after increasing the cache to the strange value returned by get_cache_max (gbytes=0, obytes=9502720), I have the following:
DBEnvironment->get_cache_max(&gbytes, &obytes); // gives gbytes=0 and obytes=9502720
memp_stat: outlinks cache_size=27328512 cache_ncache=54
with cache_size being: ((ui64)sp->st_gbytes * GIGA + sp->st_bytes);.
So cache is actually increased...
I try to reproduce this case by opening 1 env as follows.
//Before open
DbEnv->set_cachesize(); 512MB, 1 cache
DbEnv->set_cache_max; 1GB
//After open
DbEnv->get_cachesize; 512MB, 1cache
DbEnv->get_caceh_max; 1GB
memp_stat: cache:512MB, ncache:1, cache_max:1GB
//Decrease the cache size
DbEnv->set_cachesize(); 9MB(9502720B), 1 cache
DbEnv->get_cachesize; 512MB, 1cache
DbEnv->get_caceh_max; 1GB
memp_stat: cache:512MB, ncache:1, cache_max:1GB
All the result is expected. Since when resizing the cache after DbEnv is open, it is rounded to the nearest multiple of the region size. Region size means the size of each region specified initially. Please refer to BDB doc: [http://docs.oracle.com/cd/E17076_02/html/api_reference/C/envset_cachesize.html|http://docs.oracle.com/cd/E17076_02/html/api_reference/C/envset_cachesize.html]. Here region size is 512MB/1cache = 512MB. And I don't think you can resize the cache smaller than 1 region.
Since you are opening 32 env at the same time with 512MB cache and 1GB maximum for each, when the env is open, whether it can allocate as much as that specified for the cache, is dependent on the system. I am guess the number 9502720 got from get_cache_max after opening the env is probably based on the system and app request, the cache size you can get when opening the env.
And for the case listed in the beginning of the post
While live, application decreases cache of current env when finished and then increases cache of next env using:
DB_ENV->set_cachesize(gbytes, obytes, 0); // Decrease cache size of current env to initial size
DB_ENV->set_cachesize(gbytes, obytes, 0); // Increase cache size of next env to max size.
When I print statistics about the memory pool using DB_ENV->memp_stat I can see that everyting is going normally:
memp_stat: env1 ncache= 8 cache_size=20973592 // env1 is current env
memp_stat: env2 ncache= 1 cache_size=20973592
and then after changing current env:
memp_stat: env1 ncache= 1 cache_size=20973592
memp_stat: env2 ncache= 8 cache_size=20973592 // env2 is now current envWhen env1 is finishing soon, what numbers do you set in set_cachesize to decrease the cache, including the number of caches and cache size?
When decreasing the cache, I do:
env->GetDbEnv()->set_cachesize((u_int32_t)0, (u_int32_t)20973592, 0);
I mean, in all cases I simply set cachesize to its original value (obtained after open through get_cachesize) when decreasing and set cachesize to its max value when increasing (obtained though get_cache_max; plus I do something like cacheMaxSize * 0.75 if < 500MB).I can reproduce this case. And I think the result is expected. When using DBEnv->set_cachesize() to resize the cache after env is opened, the ncache para is ignored. Please refer to BDB doc here: [http://docs.oracle.com/cd/E17076_02/html/api_reference/C/envset_cachesize.html|http://docs.oracle.com/cd/E17076_02/html/api_reference/C/envset_cachesize.html] . Hence I don't think you can decrease the cache size by setting the number of cache to 0.
Hope it helps.

Globle table data problem with pragma autonomous_tranaction

hi gurus,
i have two globle table both having   preserve row on commit
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in procedure
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i m calling function which have pragma autonomous_tranaction;
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Message was edited by: Ly-Na Phu

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Have a problem with Lightroom 5.4. Since the program crashed yesterday it won't launch, it comes up with the message "Lightroom encountered an error when reading its preview cache and needs to quit". " Lightroom will attempt to fix this problem net ti

Have a problem with Lightroom 5.4. Since the program crashed yesterday it won't launch, it comes up with the message "Lightroom encountered an error when reading its preview cache and needs to quit". " Lightroom will attempt to fix this problem next time it launches". Except that it doesn't, I keep getting the same message and the program closes. Does anyone know what I can do to repair it? Can't back up, can't do anything.

There are dozens of threads in this forum that describe the fix

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