Hello everyone,
I’m going to rebuild a 900GB table using pg_repack. I’m hesitant to do such a large operation in one go.
Is there an ideal or recommended way to repack very large tables?
Everything in database maintenance is circumstantial.
The basics that I'd do are:
* Verify that you have enough free disk space for both the new table, the new indices and also the WALs generated.
* Do it during a low-activity window.
* Don't run a database backup at the same time.
* First execute with --dry-run.
* Consider the --no-order option. That'll speed things up.
* And --no-analyze, though you'll have to manually ANALYZE immediately afterwards.
* (I'd probably disable autoanalyze on that table before the repack and then enable it after the manual ANALYZE.)
* The --jobs option speeds up index rebuilds.
* Run it from cron, and redirect both stdout and stderr to the same log file.
