| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | "James Pang (chaolpan)" <chaolpan(at)cisco(dot)com> |
| Cc: | "pgsql-admin(at)lists(dot)postgresql(dot)org" <pgsql-admin(at)lists(dot)postgresql(dot)org> |
| Subject: | Re: multiple sessions to create index in parallel support |
| Date: | 2022-06-21 14:30:01 |
| Message-ID: | 2944693.1655821801@sss.pgh.pa.us |
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| Lists: | pgsql-admin |
"James Pang (chaolpan)" <chaolpan(at)cisco(dot)com> writes:
> We have a large database that just migrated data from Oracle to Postgres(13.4), after data load. We try to create indexes , with only one connection , the create index automatically run in parallel (table size 40G) , then we started two connections and each session creating index on large table, but at this time, only 1 session parallel creating index, the other one creating index in serial. There are enough parallel_workers and memory. Is that expected ? only 1 session allowed to parallel index creating at the same time ?
Check your settings for max_parallel_workers and
max_parallel_maintenance_workers.
regards, tom lane
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