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* advice about logging
@ 2018-02-06 08:42 Thomas Poty <thomas.poty@gmail.com>
0 siblings, 1 reply; 2+ messages in thread
From: Thomas Poty @ 2018-02-06 08:42 UTC (permalink / raw)
To: pgsql-admin
Hello world,
This morning, when I arrived to my desk. PostgreSQL had crashed.
I try to inspect the log file but its size about 27G and i cannot check it.
So, in order to try to reduce log i wonder which configuration about
logging is a good compromise between quantity and quality.
Here is my configuration,:
select name,boot_val,reset_val from pg_settings where name ~ 'log';
name | boot_val |
reset_val
-----------------------------+--------------------------------+-------------------------
log_autovacuum_min_duration | -1 | -1
log_checkpoints | off | off
log_connections | off | on
log_destination | stderr | stderr
log_directory | pg_log | pg_log
log_disconnections | off | on
log_duration | off | off
log_error_verbosity | default | default
log_executor_stats | off | off
log_file_mode | 384 | 384
log_filename | postgresql-%Y-%m-%d_%H%M%S.log |
postgresql-%Y-%m-%d.log
log_hostname | off | off
log_line_prefix | | %t [%p]:
[%l] %u@%d
log_lock_waits | off | off
log_min_duration_statement | -1 | 1000
log_min_error_statement | error | error
log_min_messages | warning | warning
log_parser_stats | off | off
log_planner_stats | off | off
log_replication_commands | off | off
log_rotation_age | 1440 | 1440
log_rotation_size | 10240 | 10240
log_statement | none | none
log_statement_stats | off | off
log_temp_files | -1 | -1
log_timezone | GMT |
Europe/Luxembourg
log_truncate_on_rotation | off | off
logging_collector | off | on
syslog_facility | local0 | local0
syslog_ident | postgres | postgres
wal_log_hints | off | off
(31 rows)
Any advice?
Thank you.
Thomas
^ permalink raw reply [nested|flat] 2+ messages in thread
* Re: advice about logging
@ 2018-02-06 10:55 Laurenz Albe <laurenz.albe@cybertec.at>
parent: Thomas Poty <thomas.poty@gmail.com>
0 siblings, 0 replies; 2+ messages in thread
From: Laurenz Albe @ 2018-02-06 10:55 UTC (permalink / raw)
To: Thomas Poty <thomas.poty@gmail.com>; pgsql-admin
Thomas Poty wrote:
> This morning, when I arrived to my desk. PostgreSQL had crashed.
>
> I try to inspect the log file but its size about 27G and i cannot check it.
Why?
The interesting entries are probably towards the end of the file.
> So, in order to try to reduce log i wonder which configuration about logging is a good compromise between quantity and quality.
>
> Here is my configuration,:
>
> select name,boot_val,reset_val from pg_settings where name ~ 'log';
> name | boot_val | reset_val
> -----------------------------+--------------------------------+-------------------------
> log_autovacuum_min_duration | -1 | -1
> log_checkpoints | off | off
> log_connections | off | on
> log_destination | stderr | stderr
> log_directory | pg_log | pg_log
> log_disconnections | off | on
> log_duration | off | off
> log_error_verbosity | default | default
> log_executor_stats | off | off
> log_file_mode | 384 | 384
> log_filename | postgresql-%Y-%m-%d_%H%M%S.log | postgresql-%Y-%m-%d.log
> log_hostname | off | off
> log_line_prefix | | %t [%p]: [%l] %u@%d
> log_lock_waits | off | off
You want "on". Locks that last more tham a second are a problem.
> log_min_duration_statement | -1 | 1000
> log_min_error_statement | error | error
> log_min_messages | warning | warning
These two are what you want to change.
Set log_min_messages and log_min_error_statement to 'log'.
> log_parser_stats | off | off
> log_planner_stats | off | off
> log_replication_commands | off | off
> log_rotation_age | 1440 | 1440
> log_rotation_size | 10240 | 10240
> log_statement | none | none
> log_statement_stats | off | off
> log_temp_files | -1 | -1
You should set this to some positive value to see if many of your statements
need to write temporary files and increasing work_mem would be a good idea.
> log_timezone | GMT | Europe/Luxembourg
> log_truncate_on_rotation | off | off
> logging_collector | off | on
> syslog_facility | local0 | local0
> syslog_ident | postgres | postgres
> wal_log_hints | off | off
> (31 rows)
Yours,
Laurenz Albe
^ permalink raw reply [nested|flat] 2+ messages in thread
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2018-02-06 08:42 advice about logging Thomas Poty <thomas.poty@gmail.com>
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