Database Tuning (MOSC)

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High waits on 'cursor: pin S wait on X' in 12c for a specific sql_id

edited Dec 23, 2019 11:18AM in Database Tuning (MOSC) 8 commentsAnswered

After the upgrade to12c, the performance of our DB degraded and when analyzed AWR, ADDM, ASH reports, all are pointing to one sql_id which is the major cause of the wait event mentioned here. Execute to parse ratio also went down to 5 times compared to 11g.  Any insight shared on this will be much appreciated.

Top 10 Foreground Events by Total Wait Time

EventWaitsTotal Wait Time (sec)Wait Avg(ms)% DB timeWait Class
cursor: pin S wait on X15,799619K39179.9751.0Concurrency
db file sequential read21,502,788174.3K8.1114.3User I/O
DB CPU 95.8K 7.9
library cache lock3,51449.6K

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