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I wonder if there is a way to verify data integrity of data folders from a data-recovered hard disk, both MySQL and PostgreSQL?

  • If you have enabled data-checksums in Postgres it will automatically verify that and you can use pg_verify_checksums manually before starting the instance – a_horse_with_no_name Jul 10 '19 at 5:47
  • @a_horse_with_no_name Unfortunately I have never used -data-checksums that apparently must only be set at the point of cluster creation. Thank you. – sandthorn Jul 10 '19 at 6:20
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    If you use a tool like pgbackrest it will automatically verify your backups. – a_horse_with_no_name Jul 10 '19 at 6:21
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    Check Percona Toolkit for checksumming MySQL. But you need checksums before the dump, too. – Rick James Jul 11 '19 at 14:21
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As far as I know, the only way in PostgreSQL is to run something like

pg_dumpall >/dev/null

which will scream if it encounters table corruption.

However, that won't test index integrity. For that, PostgreSQL v11 has the amcheck extension.

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