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980038 wrote:ever consider to implement connection pooling?
We have recently taken an upgrade from 10G to 11G. Since then, it seems when the number of connections exceeds 5000 to our database,
I suspect the culprit is the application; not the database.
Pl post OS details, along with exact versions of "10g" and "11g" - these are just marketing labels. If you have an AWR license, pl have the DBAs run an AWR report for when the database was unresponsive - such historical data is stored in the database for 30 days by default. The AWR report will likely point to the cause of this issue.