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More checks for "large amount of dead tuples"

Nikolay Samokhvalov requested to merge nik-n-dead-tup-more-diagnostics into master

Edited the "large amount of dead tuples" section:

  • more actions to diagnose the autovacuum behavior,
  • how to check root cause of increased n_dead_tup (if there were a lot of DELETEs and UPDATEs happened recently)

The section still may be improved in terms of the list of possible actions to resolve the problem.

Edited by Nikolay Samokhvalov

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