PostgreSQL how to see which queries have run
DatabasePostgresqlPgadminDatabase Problem Overview
I have a PostgreSQL DB at my computer and I have an application that runs queries on it.
How can I see which queries has run on my DB?
I use a Linux computer and pgadmin.
Database Solutions
Solution 1 - Database
Turn on the server log:
log_statement = all
This will log every call to the database server.
I would not use log_statement = all on a production server. Produces huge log files.
The manual about logging-parameters:
>log_statement (enum)
>
> Controls which SQL statements are logged. Valid values are none (off), ddl, mod, and all (all statements). [...]
Resetting the log_statement parameter requires a server reload (SIGHUP). A restart is not necessary. Read the manual on how to set parameters.
Don't confuse the server log with pgAdmin's log. Two different things!
You can also look at the server log files in pgAdmin, if you have access to the files (may not be the case with a remote server) and set it up correctly. In pgadmin III, have a look at: Tools -> Server status. That option was removed in pgadmin4.
I prefer to read the server log files with vim (or any editor / reader of your choice).
Solution 2 - Database
PostgreSql is very advanced when related to logging techniques
Logs are stored in Installationfolder/data/pg_log folder. While log settings are placed in postgresql.conf file.
Log format is usually set as stderr. But CSV log format is recommended. In order to enable CSV format change in
log_destination = 'stderr,csvlog'
logging_collector = on
In order to log all queries, very usefull for new installations, set min. execution time for a query
log_min_duration_statement = 0
In order to view active Queries on your database, use
SELECT * FROM pg_stat_activity
To log specific queries set query type
log_statement = 'all' # none, ddl, mod, all
For more information on Logging queries see PostgreSql Log.
Solution 3 - Database
I found the log file at /usr/local/var/log/postgres.log on a mac installation from brew.
Solution 4 - Database
While using Django with postgres 10.6, logging was enabled by default, and I was able to simply do:
tail -f /var/log/postgresql/*
Ubuntu 18.04, django 2+, python3+
Solution 5 - Database
You can see in pg_log folder if the log configuration is enabled in postgresql.conf with this log directory name.