![]() In database version 11.2.0.4, Oracle has implemented a new algorithm for modifying components of the SGA memory, which has issue while changing the size of the stream pool size. 38 enqueue Streams AQ: enqueue blocked on low memory SQL> select component,currentsize/1024/1024,lastopertype,lastopertime from vsgadynamiccomponents Here we can see that streams pool got shrink-ed due to which it was in hung state. After digging, Oracle MOS portal helped me in this case. Almost 94% of time was spent on the “Streams AQ: enqueue blocked on low memory” wait event. The problem also reproduces when running an. EXPDP And IMPDP Slow Performance In 11gR2 and 12cR1 And Waits On. The slow Import Data Pump performance problem might also reproduce in other Oracle11g Releases (like: 11.2.0.3) or Oracle12c Release 12.1.0.1. And sometimes there may be Streams AQ: enqueue blocked on low memory errors in expdp log and alert log, but note that it may not be, but it is possible. Streams AQ: enqueue blocked on low memoryexpdp. The import with DataPump of tables into an Oracle11g Release 11.2.0.4 database takes almost 45 minutes, while the same import into Oracle10g Release 10.2.0.4 only take 2 minutes. Configuring Network Connectivity and Database Links. Setting Initialization Parameters Relevant to Streams. Datapump Expdp Or Impdp Slowdown Due To Frequent Waits On Streams AQ: Enqueue Blocked On Low Memory' (Doc ID 2386566.1) Two important information: Select shrinkphaseknlasg from XKNLASG Will return 1 if the stream pool is shrinking and return 0 if such action is finished. This chapter contains these topics: Configuring a Streams Administrator. The key information I got was this: If the size of the streamspool is being modified, then this can result in excessive waits for Streams AQ: enqueue blocked. This chapter provides instructions for preparing a database or a distributed database environment to use Streams. Cause: streamspoolsize is autotuned with. When the streams pool finishes shrinking, the value should return "0", but if it keeps returning "1", you may encounter this problem.How can I get the current SGA memory distribution on Oracle 10G? Something like this: AME SIZEMB RES - Maximum SGA Size 396 No Shared Pool Size 320 Yes Startup overhead in Shared Pool 32 No Streams Pool Size 32 Yes Java Pool Size 24 Yes Buffer Cache Size 16 Yes Granule Size 4 No Redo Buffers 2,79 No Fixed SGA Size 1,21 No Free SGA Memory Available 0 Large Pool Size 0 Yes. Streams AQ: enqueue blocked on low memory during data pump export. Check the stream pool size parameter SQL> show parameter streams NAME TYPE VALUE. The wait 'Streams AQ: enqueue blocked on low memory' indicates exhaustion of the streams pool. This value indicates that the streams pool is in the shrinking phase. Streams AQ: enqueue blocked on low memory processing issue in Oracle 1. If you encounter similar performance problems, please check whether the following query always returns "1". If you check the session, you’ll find it frequently waiting on Streams AQ: enqueue blocked on low memory, this is due to the BUG 27634991. In the Auto SGA environment (sga_target or memory_target is set), this problem may occur when the buffer cache load is high and the memory in the streams pool is being moved to the buffer cache. Sometimes you might find your export job, out of nowhere, starts taking a lot to finish, like if it normally takes 2 hours to end after 5 hours is still running and it’s not even at half the job done. Waiting events in the database will also prompt Streams AQ: enqueue blocked on low memoryĪnd sometimes there may be Streams AQ: enqueue blocked on low memory errors in expdp log and alert log, but note that it may not be, but it is possible. ![]() OUI-67301: The following patches have conflicts. ![]() > 1 Streams AQ: enqueue blocked on low memory 2 I get this warning applying Patch 21286665: EXPORT IS SLOW WAITING FOR 'STREAMS AQ: ENQUEUE BLOCKED ON LOW MEMORY' with OPatch 11.2.0.3.11 but the Patch finally didn't apply. SQL> select inst_id,event,count(1) from gv$session where wait_class# 6 group by inst_id,event order by 1,3
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