postgresql_hacks/change_settings.md

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## How to reload config changes during the runtime (SIGHUP)?
```
select pg_reload_conf();
```
## Does changing a config setting require a restart of postgresql or just a reload (SIGHUP)?
This can be archived by simply selecting the setting from pg_settings.
```
select context from pg_settings where name='max_wal_size';
```
## Is a restart of postgresql required?
```
select pending_restart from pg_settings where name='max_wal_size';
```
This will tell you if a restart is pending for a setting.
## How to check configuration (postgresql.conf) for configuration errors
```
select sourcefile, name,sourceline,error from pg_file_settings where error is not null;
```
## How to check pg_hba.conf for configuration errors
```
select pg_hba_file_rules();
```