"James Pang (chaolpan)" <chaolpan@cisco.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
twoconnections 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
sessionallowed to parallel index creating at the same time ?
Check your settings for max_parallel_workers and
max_parallel_maintenance_workers.
regards, tom lane