Excessive Number of Open Cursors by the Wnnn Background Process
(Doc ID 2589563.1)
Last updated on SEPTEMBER 24, 2019
Applies to:Oracle Database - Enterprise Edition - Version 22.214.171.124.0 to 126.96.36.199.0 [Release 18]
Information in this document applies to any platform.
Each KTSJ module process is holding hundreds of opened cursors causing EM alerts for high cursor counts + memory. The sessions appear to remain open (session state ACTIVE), holding these cursors. This database has recently been upgraded to 18c.
The Wnnn and SMCo processes appear to remain active for weeks at a time, as we can see by grepping for the OS process id:
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