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SQLPLUS and RMAN initial connection very slow

edited Aug 23, 2021 8:23AM in Database Administration (MOSC) 7 comments

Hi Community,

We have recently upgraded from 12c to 19c and have found a strange issue. Since the upgrade SQLPLUS and RMAN initial connection to database is very slow

We are connecting using

sqlplus / as sysdba = 2 seconds before upgrade, 30 seconds after upgrade

rman target / = 5-10 seconds before upgrade, 4-5 minutes after upgrade

This is not running commands this is purely the initial connection to get connected to the DB.

We have a ticket open with Oracle support but looking for any other advice.

The strange thing is we can see using process monitor (windows) there are clearly blocks of 30 second delays where noting happens when running RMAN command.

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