Re: wide table, many many partitions, poor query performance

2021-03-15 Thread Laurenz Albe
On Mon, 2021-03-15 at 10:53 -0600, S Bob wrote: > We have a client that is running PostgreSQL 12, they have a table with > 212 columns and 723 partitions > > It seems the planning time is consumed by generating 723 sub plans > > I suspect it's due to the fact that they are using hash based > pa

Re: wide table, many many partitions, poor query performance

2021-03-15 Thread Justin Pryzby
On Mon, Mar 15, 2021 at 10:53:06AM -0600, S Bob wrote: > We have a client that is running PostgreSQL 12, they have a table with 212 > columns and 723 partitions > > It seems the planning time is consumed by generating 723 sub plans Is plannning time the issue ? Please show diagnostic output. You

wide table, many many partitions, poor query performance

2021-03-15 Thread S Bob
All; We have a client that is running PostgreSQL 12, they have a table with 212 columns and 723 partitions It seems the planning time is consumed by generating 723 sub plans I suspect it's due to the fact that they are using hash based partitioning, example: CREATE TABLE rental_transact

Re: FreeBSD UFS & fsync

2021-03-15 Thread Luca Ferrari
On Fri, Mar 12, 2021 at 10:34 AM Thomas Munro wrote: > It looks like your system is performing very badly for some other > reason, so that synchronous I/O waits are only a small proportion of > the time, and thus fsync=off doesn't speed things up very much. I'd > look into profiling the system to