On Thu, 2025-05-15 at 16:27 +0800, James Pang wrote: > PGv 15.10, many session coming in doing "insert into tablexxx values...." in parallel, > this is a range partition tables, total 12 partitions plus one default partition, > only three btree indexes, no others constraints ,no foreign key. but we see hundreds > of session waiting on "lock:relation", why inserts into partition table cause "relation lock" ? Something else does; use the pg_blocking_pids() function with the process ID of a blocked backend to find out who is holding the lock. If you have hundreds of sessions, you are allowing to many connections. Yours, Laurenz Albe
