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Does FlashCache in writeback mode accelerate Standby which is only MOUNTED?

in Exadata General (MOSC) 5 commentsAnswered

Hi,

I'm migrating Oracle 19.14 database from Exadata X6 to X9 (fw: 23.1.2). This is warehouse DB with significant amount of redo generated (~300MB/s) which causes problems on X6 already (sometimes apply lag increases to hours).

For now, I'm testing redo apply speed on X9 using Standby database which is updated from backed up archivelogs (this database is not directly connected to database on X6 yet and does not use real-time apply). I see similar problems as on X6, i.e. "slow" redo apply - specifically when DB_LOST_WRITE_PROTECT is set to TYPICAL (as it is on X6). In ASH on this testing Standby I see "recovery read" and "checkpoint complete" as top wait event. I've increased number of db_writers - but it does not help.

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