OCI Object Cache leaking memory

I am performing a select that selects a column object (ie column of user defined type) from a table using OCI. It all works fine. However, the OCI client-side object cache just grows and grows and grows when this query is run regardless of the settings for ATTR_CACHE_MAX_SIZE and ATTR_CACHE_OPT_SIZE. I am not pinning the objects so there should be no reason why the cache should not age the objects out and free the memory. I see no such problems on non-object selects - the cache behaves fine unless I select object types (SQLT_NTY).
I can workaround the problem by calling OCICacheFree regularly - but I don't like the inelegance of that solution. If I don't do this however, OCI will cache and cache and cache until it has exhausted all the memory on my server !!
So anyone else see this problem ? Am I doing something wrong ? Is is an Oracle bug ?
Thanks for any help,
Steve

hi there,
i dunno if my problem is related to the above issue.
BUT.
Here is what I have:
- JBoss-3.2.1 running on Linux RedHat 9
- Oracle 9 running ... somewhere
Here is what I want:
- to regularly transfer big files from the client app thru JBoss/EJBs to Oracle
Here is what I tried:
- I tried BLOBs and CLOBs and etc. But the ARRAY choice appeared to be the best and has been working pretty fine till I started getting the problem I am gonna talk about here below.
Here is what I do (the code snippet of an EJB):
Connection conn = null;
CallableStatement stmt = null;
// some code
stmt = conn.prepareCall("begin SOME_PROCEDURE");
// some code
ArrayList data = new ArrayList();
ByteArrayInputStream is = new ByteArrayInputStream(fileContent);
ArrayDescriptor arrdesc = ArrayDescriptor.createDescriptor("RAW_VARRAY", ((JDCConnection)conn).getConnection());
ARRAY arr = new ARRAY(arrdesc, ((JDCConnection)conn).getConnection(), data.toArray());
((oracle.jdbc.OracleCallableStatement)stmt).setARRAY(2, arr);
// trying to execute the stmt
stmt.execute();
Where:
- RAW_ARRAY is a user-defined Oracle collection type. It is basically 'array[10240] of RAW'
- JDCConnection implements java.sql.Connection.
(JDCConnection was created to facilitate connection pooling inside JBoss, but I guess, yes I guess, that's not that relevant here).
Here is the PROBLEM:
- the code works pretty fine for a while
- BUT after some time, the code starts dumping the following exception:
java.sql.SQLException: OCI-21522: attempted to use an invalid connection in OCI (object mode only)
at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:169)
at oracle.jdbc.oci8.OCIDBAccess.check_error(OCIDBAccess.java:1609)
at oracle.jdbc.oci8.OCIDBAccess.getOracleTypeADT(OCIDBAccess.java:1745)
at oracle.jdbc.oracore.OracleTypeADT.initMetadata(OracleTypeADT.java:386)
at oracle.jdbc.oracore.OracleTypeADT.init(OracleTypeADT.java:344)
at oracle.sql.ArrayDescriptor.initPickler(ArrayDescriptor.java:1002)
at oracle.sql.ArrayDescriptor.<init>(ArrayDescriptor.java:132)
at oracle.sql.ArrayDescriptor.createDescriptor(ArrayDescriptor.java:97)
Can anybody let me know if you have any ideas of what's going on here?
Your help is badly needed, guys!
Many thx in advance!!
my best,
Kanat.

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Jaime

Jorth, maybe we are not well explained,
the normal operation of imapd process(one process) need no more that 200MB, when a user is linked to it.
Check my example:
================================================================================================================
PID USERNAME SIZE RSS STATE PRI NICE TIME CPU PROCESS/NLWP
874 root 610M 421M sleep 59 0 0:14:51 0.1% java/160
818 webservd 413M 285M sleep 59 0 0:16:43 0.3% webservd/95
607 root 326M 45M sleep 59 0 0:07:01 0.1% webservd/58
16719 mailsrv 283M 50M sleep 59 0 0:00:06 0.0% imapd/5
798 root 237M 37M sleep 59 0 0:04:04 0.1% ns-slapd/48
*16673 mailsrv 220M 97M sleep 59 0 0:00:06 0.0% imapd/6*
*16677 mailsrv 210M 42M sleep 59 0 0:00:05 0.0% imapd/5*
*16696 mailsrv 205M 36M sleep 59 0 0:00:04 0.0% imapd/5*
*16695 mailsrv 200M 38M sleep 59 0 0:00:04 0.0% imapd/6*
*16685 mailsrv 197M 38M sleep 59 0 0:00:08 0.0% imapd/5*
*16682 mailsrv 195M 40M sleep 59 0 0:00:04 0.0% imapd/5*
*16681 mailsrv 193M 46M sleep 59 0 0:00:04 0.0% imapd/5*
*16690 mailsrv 187M 52M sleep 59 0 0:00:03 0.1% imapd/6*
*16687 mailsrv 187M 40M sleep 59 0 0:00:05 0.0% imapd/5*
*902 icsuser 185M 24M sleep 59 0 0:00:05 0.0% cshttpd/2*
NPROC USERNAME SWAP RSS MEMORY TIME CPU
78 mailsrv 2439M 2329M 28% 0:11:53 0.5%
14 icsuser 1064M 233M 2.8% 0:06:55 0.0%
136 root 965M 727M 8.9% 2:15:20 50%
1 webservd 264M 326M 4.0% 0:16:43 0.3%
1 noaccess 90M 100M 1.2% 0:01:13 0.0%
Total: 237 processes, 1042 lwps, load averages: 1.91, 1.90, 1.89
================================================================================================================
When we run an aplication like OutLook to copy locally to the laptopn all the mail via IMAP, "ONE imapd process" eat more memory that need it and never released.
Example:
================================================================================================================
PID USERNAME SIZE RSS STATE PRI NICE TIME CPU PROCESS/NLWP
*16673 mailsrv 2856M 2534M sleep 59 0 0:00:06 45% imapd/6* <---------------this process eat memory and slow the system(CPU/RAM)
874 root 610M 421M sleep 59 0 0:14:51 0.1% java/160
818 webservd 413M 285M sleep 59 0 0:16:43 0.3% webservd/95
607 root 326M 45M sleep 59 0 0:07:01 0.1% webservd/58
16719 mailsrv 283M 50M sleep 59 0 0:00:06 0.0% imapd/5
798 root 237M 37M sleep 59 0 0:04:04 0.1% ns-slapd/48
*16677 mailsrv 210M 42M sleep 59 0 0:00:05 0.0% imapd/5*
*16696 mailsrv 205M 36M sleep 59 0 0:00:04 0.0% imapd/5*
*16695 mailsrv 200M 38M sleep 59 0 0:00:04 0.0% imapd/6*
*16685 mailsrv 197M 38M sleep 59 0 0:00:08 0.0% imapd/5*
*16682 mailsrv 195M 40M sleep 59 0 0:00:04 0.0% imapd/5*
*16681 mailsrv 193M 46M sleep 59 0 0:00:04 0.0% imapd/5*
*16690 mailsrv 187M 52M sleep 59 0 0:00:03 0.1% imapd/6*
*16687 mailsrv 187M 40M sleep 59 0 0:00:05 0.0% imapd/5*
*902 icsuser 185M 24M sleep 59 0 0:00:05 0.0% cshttpd/2*
NPROC USERNAME SWAP RSS MEMORY TIME CPU
78 mailsrv 2439M 2329M 80% 0:00:5 0.5%
78 mailsrv 2439M 2329M 10% 0:11:53 0.5%
14 icsuser 1064M 233M 2.8% 0:06:55 0.0%
136 root 965M 727M 8.9% 2:15:20 50%
1 webservd 264M 326M 4.0% 0:16:43 0.3%
Total: 237 processes, 1042 lwps, load averages: 1.91, 1.90, 1.89
===================================================================================================
The rest of the imapd process(29) in this moment just load 40-50MB(when those are free).
If we kill the process 16673 the user connect to the next imapd process and the problem persist whit the same patology: eat memory and CPU, and slow the system.
So, we think that is not normal and maybe we need patch the system to solve the problem.
We will to test the 64Bit version in this moment and we will post the results.
Thank
Jaime

OCI Object Cache leaking memory

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