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Hi, Application team is reporting performance is slow. While looking at the log, I have the following information from the maintenance log.
Viewing Log: error/postgresql.log.2023-07-10-14 (5.9 kB):- **************************************************** 2023-07-10 14:00:01 UTC::@:[355]:LOG: checkpoint complete: wrote 426 buffers (0.1%); 0 WAL file(s) added, 0 removed, 1 recycled; write=42.847 s, sync=0.002 s, total=42.854 s; sync files=12, longest=0.002 s, average=0.001 s; distance=64874 kB, estimate=66875 kB 2023-07-10 14:04:19 UTC::@:[355]:LOG: checkpoint starting: time 2023-07-10 14:08:49 UTC::@:[355]:LOG: checkpoint complete: wrote 9197 buffers (1.9%); 0 WAL file(s) added, 0 removed, 2 recycled; write=269.779 s, sync=0.003 s, total=269.789 s; sync files=16, longest=0.003 s, average=0.001 s; distance=83868 kB, estimate=83868 kB 2023-07-10 14:09:19 UTC::@:[355]:LOG: checkpoint starting: time 2023-07-10 14:10:21 UTC::@:[355]:LOG: checkpoint complete: wrote 622 buffers (0.1%); 0 WAL file(s) added, 0 removed, 0 recycled; write=62.562 s, sync=0.004 s, total=62.569 s; sync files=26, longest=0.004 s, average=0.001 s; distance=48633 kB, estimate=80345 kB 2023-07-10 14:13:11 UTC:10.66.238.11(58986):postgres@bronxdb1:[27434]:ERROR: relation "bronxdev.tek_test_details_wafer" does not exist at character 15 2023-07-10 14:13:11 UTC:10.66.238.11(58986):postgres@bronxdb1:[27434]:STATEMENT: select * from bronxdb1.bronxdev.tek_test_details_wafer 2023-07-10 14:14:19 UTC::@:[355]:LOG: checkpoint starting: time 2023-07-10 14:15:38 UTC::@:[355]:LOG: checkpoint complete: wrote 784 buffers (0.2%); 0 WAL file(s) added, 0 removed, 1 recycled; write=78.655 s, sync=0.002 s, total=78.662 s; sync files=20, longest=0.002 s, average=0.001 s; distance=66114 kB, estimate=78922 kB 2023-07-10 14:19:19 UTC::@:[355]:LOG: checkpoint starting: time 2023-07-10 14:19:58 UTC::@:[355]:LOG: checkpoint complete: wrote 385 buffers (0.1%); 0 WAL file(s) added, 0 removed, 1 recycled; write=38.625 s, sync=0.002 s, total=38.632 s; sync files=15, longest=0.002 s, average=0.001 s; distance=63006 kB, estimate=77330 kB 2023-07-10 14:20:52 UTC:10.66.209.82(49945):postgres@bronxdb1:[27821]:ERROR: syntax error at or near "[" at character 17 2023-07-10 14:20:52 UTC:10.66.209.82(49945):postgres@bronxdb1:[27821]:STATEMENT: select distinct [source] from bronx.errors fetch first 100 rows only 2023-07-10 14:21:57 UTC:10.66.238.11(58986):postgres@bronxdb1:[27434]:ERROR: relation "bronx.weekly_operations_review_wafer" does not exist at character 15 2023-07-10 14:21:57 UTC:10.66.238.11(58986):postgres@bronxdb1:[27434]:STATEMENT: select * from bronxdb1.bronx.weekly_operations_review_wafer LIMIT 10; 2023-07-10 14:24:19 UTC::@:[355]:LOG: checkpoint starting: time
I think, we need to manage the check points. Any help on this would be appreciated.
I am providing current checkpoint configuration. RDS / Parameter groups / default.postgres14 / default.postgres14:- ****************************************************************** Name Values Allowed values Modifiable Source Apply type Data type Description
checkpoint_completion_target 0.9 0-1 true system dynamic float Time spent flushing dirty buffers during checkpoint, as fraction of checkpoint interval.
checkpoint_flush_after 0-256 true engine-default dynamic integer (8kB) Number of pages after which previously performed writes are flushed to disk.
checkpoint_timeout 30-3600 true engine-default dynamic integer (s) Sets the maximum time between automatic WAL checkpoints.
checkpoint_warning 0-2147483647 true engine-default dynamic integer (s) Enables warnings if checkpoint segments are filled more frequently than this.
log_checkpoints 1 0, 1 true engine-default dynamic boolean Logs each checkpoint. Recent events
Can you please help in making the changes suitably or point me to the documentation?
Thanks, Sarwar
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