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Database slow after conversion to Oracle 19.18

in Database Administration (MOSC) 21 commentsAnswered ✓

Hi, good morning.

This is about converting Oracle 12.2.0.1 databases to Oracle 19.18.

Conversion is as follows. Use the same server, same OS (Oracle RH 7.9), same NAS volumes.

  • Full database export from the 12.2.0.1 database
  • Create Oracle 19.18 skeleton database using DBCA
  • Create all tablespaces in Oracle 19.18 database
  • Full database import into the Oracle 19.18 database from the 12.2.0.1 database export
  • Generate new stats for all non-system tables and indexes
  • Generate SYS stats for the new database.

The problem is, two out of the four major databases i have converted in this way, are painfully slow, especially using tools like Oracle Enterprise Manager 13cR5 or even Toad (slow to load).

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