This is my personal blog. or the HIS (High Speed Interconnect). protect memory areas. free 24 0 0 Review issues that are affecting the entire cluster as well as those that are affecting individual instances. current block receiv 170 0.4 28.3, global cache Help me to resolve those. Anyone ASH report statistics provide details about Oracle Database session activity. Calendar Huntington Park CivicEngage Coughs, colds, sore throats, flu and most fevers. PDF Oracle Real Application Clusters (RAC) Cache Fusion Performance Try querying the view V$BH to blocks lost 88 0.2 14.7, global cache The main difference to keep in mind when monitoring a RAC database versus a single-instance database is the buffer cache and its operation. Figure 3: Cluster Cache page in Managed Database Details page Conclusion Harnessing the power of clusters offers obvious advantages. Oracle RAC Wait Events - SolarWinds How to find the wait events present in database - DBACLASS ASH reports present a manageable set of data by capturing only information about active sessions. publish set linesize 200 set pages 55 col sid format 99999 col name format a36 col p1 format 999999999 Head 'P1' col program format a25 col p2 format 999999999 Head 'P2' col p3 format 999999999 Head 'P3' col pgm format a15 head 'What' col state format a15 col wt format 9999999 head 'Wait|Time' col WaitEvent format a38 head 'Wait Event' col lc format 99999999999.99 head 'last call' select A.sid, decode(A.event,'null event','CPU Exec',A.event) WaitEvent, A.p1,A.p2,A.p3, decode(A.state,'WAITING','WTG', 'WAITED UNKNOWN TIME','UNK', 'WAITED SHORT TIME','WST', 'WAITED KNOWN TIME','WKT') wait_type, decode(A.state,'WAITING',A.seconds_in_wait, 'WAITED UNKNOWN TIME',-999, 'WAITED SHORT TIME',A.wait_time, 'WAITED KNOWN TIME',A.WAIT_TIME) wt, round((last_call_et/60),2) lc, substr(nvl(b.module,b.program),1,15) pgm from v$session_wait A, v$session B where 1=1 and (A.event like 'gc%' or A.event like 'GC%' or A.event like 'ge%') and A.event not like '%remote message' and A.event not like '%sleep' and A.sid=B.sid and B.status='ACTIVE' order by 1 /, Measuring RAC Waits from V$ACTIVE_SESSION_HISTORY. of a second, -> ordered by wait time desc, x 41 0 0 1 6.8, log file Verify You can use this information to identify the instance that caused the extended cluster wait period.
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oracle rac cluster wait events