Excessive Number of Open Cursors by the Wnnn Background Process
(Doc ID 2589563.1)
Last updated on JULY 20, 2024
Applies to:
Oracle Database - Enterprise Edition - Version 18.1.0.0.0 to 19.3.0.0.0 [Release 18]Information in this document applies to any platform.
Symptoms
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:
Changes
Cause
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In this Document
| Symptoms |
| Changes |
| Cause |
| Solution |
| References |