Ora 4031 Error
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ora 04031 unable to allocate 4096 bytes of shared memory ORA-04031 solution Oracle Error Tips by Burleson Consulting Updated February 24,Ora-04031 Solution
2016 Oracle docs note this about ORA-04031: ORA-04031: unable to allocate string bytes of shared memory Cause: More shared memory
Ora-04031 Unable To Allocate 4160 Bytes Of Shared Memory
is needed than was allocated in the shared pool. Action: If the shared pool is out of memory, either use the dbms_shared_pool package to pin large packages, reduce your use of shared memory, or increase the
Ora-04031: Unable To Allocate 65560 Bytes Of Shared Memory
amount of available shared memory by increasing the value of the INIT.ORA parameters "shared_pool_reserved_size" and "shared_pool_size". If the large pool is out of memory, increase the INIT.ORA parameter "large_pool_size". There are many valuable resources regarding shared pool sizing, and ORA-04031 is very commonly encountered in situations involving the sizing of large pools. Below is an excerpt from an the article, Oracle Concepts - Shared Pool and Multi-Threaded Server (MTS) in which ORA-04031 is ora 04031 oracle 11g r2 addressed and offered a resolution. If ORA-04031 is thrown, consider using the following select: select name, SUM(bytes) from V$SGASTAT where pool='LARGE POOL' group by ROLLUP(name); Though the number of bytes may vary, ORA-04031 is commonly thrown in operations with configured large pools. The exampled select above offers a summary of the number of bytes which will reveal the current pool size and you proximity to the maximum pool size which is specified within the LARGE_POOL_SIZE parameter. You will find that when the LARGE_POOL is increased up to 100%, ORA-04031 will typically be eliminated. To help you to understand more clearly the impact that large pool sizing can have in resolving ORA-04031, you may be interested in the statement below: Sizing the large pool can be complex. The large pool, if configured must be at least 600 kilobytes in size. Usually for most MTS applications 600k is enough. However, if PQO is also used in your Oracle8 environment then the size of the large pool will increase dramatically. The V$SGASTAT dynamic performance view has a new column in Oracle8, POOL. The POOL column in the V$SGASTAT view is used to contain the pool area where that particular type of object is being stored. By issuing a summation select against the V$SGA
SQL TuningSecurityOracle UNIXOracle LinuxMonitoringRemote supportRemote plansRemote servicesApplication Server ApplicationsOracle FormsOracle PortalApp UpgradesSQL ServerOracle ConceptsSoftware SupportRemote Support Development Implementation Consulting StaffConsulting PricesHelp Wanted! Oracle PostersOracle Books Oracle Scripts Ion Excel-DB Don ora 04031 unable to allocate 4096 bytes of shared memory java pool Burleson Blog
dde: problem key 'ora 4031' was completely flood controlled (0x6) ORA-04031: unable to allocate nn bytes of shared memory Oracle Database Tips by Burleson Consulting July 17, ora-04031 oracle 12c 2015 - Updated February 24, 2016 Question: I am getting the error ORA-04031 Cannot allocate shared memory. I've tried increasing my init.ora shared_pool_size, but to no avail. What are some http://www.dba-oracle.com/sf_ora_04031_unable_to_allocate_string_bytes_of_shared_memory.htm causes for the ORA-04031 error, and how do I fix it?Answer: The ORA-04031 error has many root causes. Also, see MOSC notes 146599.1 and 396940.1 for more details for resolving the ORA-04031 error: Heavy fragmentation of the shared pool - This can be fixed by increasing the shared_pool_size or doing a "alter system flush shared pool" or bouncing the instance. Too many http://www.dba-oracle.com/t_ora_04031_unable_to_allocate_shared_memory.htm pinned packages - If you have pinned lots of packages with dbms_shared_pool.keep, they have not leave enough room for new work. Ultimately the solution to a ORA-04031 error is adding RAM to shared_pool_size and/or shared_pool_reserved_size. In 11g and beyond , if using AMM, increase memory_max_size to resolve the ORA-04031 error. The Oracle documentation has these notes on the ORA-04031 error: ORA-04031: unable to allocate nn bytes of shared memory Cause: More shared memory is needed than was allocated in the shared pool. Action: If the shared pool is out of memory, either use the dbms_shared_pool package to pin large packages, reduce your use of shared memory, or increase the amount of available shared memory by increasing the value of the INIT.ORA parameters "shared_pool_reserved_size" and "shared_pool_size". If the large pool is out of memory, increase the INIT.ORA parameter "large_pool_size". The ORA-04031 error also happens when you are using automatic memory management (sga_max_size), and the memory specific is too small. ��Fundamentals Oracle Errors Performance Tuning ASM Datafiles & Tablespaces Exadata 5 Easy Step to Solve ORA-04031 with Oracle Support Provided Tool Are http://www.dbas-oracle.com/2013/05/5-Easy-Step-to-Solve-ORA-04031-with-Oracle-Support-Provided-Tool.html you still seeing "ORA-04031: unable to allocate 512 bytes of shared memory". Now Remote DBA need not to worry about this error because Oracle has introduced a very http://blog.tanelpoder.com/2009/06/04/ora-04031-errors-and-monitoring-shared-pool-subpool-memory-utilization-with-sgastatxsql/ good tool to Troubleshoot ORA-04031. You just need to upload alert log files and trace file having error details and an online tool will give a solution unable to immediately. Before going into detail, Let's first understand what is ORA-04031 ? when It arise ? and what is difference between ORA-04031 and ORA-04030 ? What is ORA-04031 ? and When it arise ? ORA-04031 is error message related to lack of available SGA memory component. When a process needs some memory from SGA and memory unable to allocate is not available in this situation ORA-04031 occurs. What is difference between ORA-04031 and ORA-04030 ? ORA-04031 is error message related to lack of available SGA memory component While RA-04030 is related to lack of available memory in PGA area. ORA-4031 error message look like this in Database Alert log files: Tue Sep 27 22:20:33 2011 Errors in file /u01/app/oracle/diag/rdbms/dbh/Dbh3/trace/Dbh3_j004_16488.trc (incident=72497): ORA-04031: unable to allocate 32 bytes of shared memory ("shared pool","select t.ts#,t.file#,t.block...","SQLA","tmp") Incident details in: /u01/app/oracle/diag/rdbms/dbh/Dbh3/incident/incdir_72497/DBH3_j004_16488_i72497.trc Tue Sep 27 22:20:43 2011 Dumping diagnostic data in directory=[cdmp_20110927222043], requested by (instance=3, osid=16488 (J004)), summary=[incident=72497]. Use ADRCI or Support Workbench to package the incident. See Note 411.1 at My Oracle Support for error and packaging details. ORA-4030 error message look like this in Database Alert log files: Wed Mar 27 13:35:52 2013 Errors in file /u01/app/orappdw1/diag/rdbms/dbh/DBH4/trace/DBH4_pz99_15585_DBMS_SQLDIAG_10053_20130327_132724.trc (incident=146193): ORA-04030: out of process memory when trying to allocate 8224 bytes (qesca subheap,qerjo hash table) Incident details in: /u01/app/orappdw1/diag/rdbms/dbh/DBH4/incident/incdir_146193/DBH4_pz99_15585_i146193.trc Use ADRCI or Support Workbench to package the incident. S
TPT scripts for solving real life performance problems → ORA-04031 errors and monitoring shared pool subpool memory utilization with sgastatx.sql by Tanel Poder Posted on June 4, 2009 Since Oracle 9.2 the shared pool can be "partitioned" into multiple parts. This was probably done for relieving shared pool latch contention for crappy applications (which use shared pool latches too much due bad cursor or connection management). The "partitions" are called shared pool subpools and there can be up to 7 subpools. Each subpool is protected by a separate shared pool latch and each subpool has its own freelists and LRU list. If you are interested in more details, a good starting point is this whitepaper by Oracle. There are few different ways for detecting how many subpools you have in use. The more convenient ones are here: You could query X$KGHLU which has a line for each shared pool subpool and (from 10g) also java pool if it's defined: SQL> select count(distinct kghluidx) num_subpools 2 from x$kghlu 3 where kghlushrpool = 1; NUM_SUBPOOLS ------------ 7 The "kghlushrpool" column, which is 1 for shared pool subheaps and 0 for java pool, isn't there in 9i (and in 9i the java pool apparently is not reported in x$kghlu anyway). The reason why I don't just count all matching lines from x$kghlu but use count distinct instead is that in Oracle 10.2.0.1 there are 4x more lines reported in this x$table. There's an additional concept called sub-sub-pool starting from 10.2 where each shared pool sub-pool is split futher into 4 areas (allocations with different expected lifetime/durations go into different sub-sub-pools, but the same sub-pool latch protects all activity in sub-sub pools too). But in 10.2.0.1 the x$kghlu reports all sub-sub-pools too for some reason. The whitepaper from Oracle mentioned above explains this in more detail. So from above output I see that in my instance all 7 shared pool subpools are in use. Oracle determines the number of needed subpools (during instance startup) based on your shared pool size and cpu_count. IIRC in 9.2 if you had 4 CPUs or more AND the shared_pool_size was bigger than 256 MB then 2 subpools were used, in 10g shared_pool_size had to be bigger for that, 512 MB I think and in 11g its 1GB. I don't recall the exact threshold values and that's not really important as you can see yourself how many subpools are in use with the above query. For sake of this experiment I set the _kghdsidx_count variable to 7, this parameter can be used to fo