streams aq enqueue blocked on low memory

#Streams aq enqueue blocked on low memory crack

SQL> ALTER SYSTEM SET streamspoolsize 150m SCOPEboth Restart the Database and then run the export backup. I checked the wait event after that and I could not find such wait event, so I guessed the issue should be fixed. We are going to change the memory for the streams pool using the below query. So I run statement in step 2 to complete it and I did begin to get value 0. I was surprised as we set the stream pool to 500M one day before and we still in the shrink action. I run the statement in step 1 and did get value 1. Will force to complete the stream pool shrink. 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. Alter system set events 'immediate trace name mman_create_def_request level 6'.Select shrink_phase_knlasg from X$KNLASG Will return 1 if the stream pool is shrinking and return 0 if such action is finished.I could not restart it as it is a production database, so I tried to find more and got below notes:ĭatapump Expdp Or Impdp Slowdown Due To Frequent Waits On ”Streams AQ: Enqueue Blocked On Low Memory' (Doc ID 2386566.1) Three patches were mentioned and I found all of them already were included in the latest PSU, so maybe I just need to restart the instance to observe the result. We modified it and when I checked and found the default value was TRUE, so in fact no need to modify it. 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. 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. Datapump - Export trs lent - Streams AQ : enqueue blocked on low memory. Alter system set '_disable_streams_pool_auto_tuning'=TRUE. Streams AQ: enqueue blocked on low memory processing issue in Oracle 1. Derrire cette petite phrase se cache peut tre une opportunit intressante pour.

Explicitly set the streams_pool_size to a fixed (large enough) value, 150 Mb or 300 Mb if needed.

The key information I got was this: If the size of the streams_pool is being modified, then this can result in excessive waits for 'Streams AQ: enqueue blocked on low memory'.Įvery occurrence for this event causes a 1 minutes delay.Īnd the suggested actions could be easily executed were: The impdp process came back to work after increasing the streams_pool_size.Our daily expdp backup job became abnormally and it would last more than one day, while in the past it just took about 40 minutes.įrom the v$session view I found the expdp related processes were waiting for event 'Streams AQ: enqueue blocked on low memory', and I also found the export speed was very very slow even the exported tables were empty.ĮXPDP And IMPDP Slow Performance In 11gR2 and 12cR1 And Waits On Streams AQ: Enqueue Blocked On Low Memory (Doc ID 1596645.1) Where a.indx = b.indx and a.indx = c.indx and lower(a.ksppinm) in ('_streams_pool_size','streams_pool_size') Īpós a alteração, o processo de import voltou ao normal. blocked due to flow control - Streams AQ: enqueue blocked on low memory. Which was to increase the parameter STREAMS_POOL_SIZE to the value returned by the query: select 'ALTER SYSTEM SET STREAMS_POOL_SIZE='||(max(to_number(trim(c.ksppstvl)))+67108864)||' SCOPE=SPFILE 'įrom sys.x$ksppi a, sys.x$ksppcv b, sys.x$ksppsv c PMgrp0 grant - gc assume - gc block recovery request - gc buffer. Que foi aumentar o valor do parâmetro STREAMS_POOL_SIZE para o valor da query:

Bug 17365043 : “STREAMS AQ: ENQUEUE BLOCKED ON LOW MEMORY” WHEN REDUCING STREAMS_POOL_SIZE.

What DataPump And Oracle RDBMS Parameters And Features Can Significantly Affect DataPump Performance ? (Doc ID 1611373.1).

Datapump Expdp Or Impdp Slowdown Due To Frequent Waits On ”Streams AQ: Enqueue Blocked On Low Memory” (Doc ID 2386566.1).

#Streams aq enqueue blocked on low memory crack

With theses three documents below I could crack this issue: Os três notes abaixo trouxeram a solução: Verificando o Grid Control ficou claro que a sessão de impdp estava “em espera” pelo evento Oracle StreamsAQ: enqueue blocked on low memory.Ĭhecking Grid Control it was clear that impdp process was in queuing state at Oracle event StreamsAQ: enqueue blocked on low memory After digging, Oracle MOS portal helped me in this case. This week my impdp process took longer then expected. Almost 94 of time was spent on the Streams AQ: enqueue blocked on low memory wait event. Ótimo ! Mais um problema para resolver 🙂 Essa semana o processo de importação de dados demorou muito mais do que o normal. Bug 27634991 - EXPDP FREQUENTLY WAITS ON STREAMS AQ: ENQUEUE BLOCKED ON LOW MEMORY - Unpublished Bug 26736110 - DATAPUMP METADATA EXPORT IS SLOW FOR.