pg_stat_activity 中的查询被截断了吗？

Question

I'm using SELECT current_query FROM pg_stat_activity; to see the currently executing queries, but I noticed that the query is truncated. Is there any workaround or any other way to see the currently executing queries?

Answer 1

ALTER SYSTEM SET track_activity_query_size = 16384;

You will still need to restart the service for that to take effect

Answer 2

PostgreSQL 8.4 adds the parameter " track_activity_query_size ". The value will still be truncated, but you can control at what length.

Answer 3

An alternative in the extreme case is to use the gdb debugger to attach to the process and print out the query.

See http://darthanthony.wordpress.com/2012/10/11/viewing-running-postgres-queries-and-what-if-they-are-too-long/

gdb [path_to_postgres] [pid]

printf "%s\n", debug_query_string

Answer 4

Starting from PostgreSQL 13 the maximum value of track_activity_query_size is increased to 1MB .

If you use docker, you can configure your docker-compose file like this:

# ...
services:
  postgres:
    container_name: postgres
    image: postgis/postgis:13-3.1
    command:
      - "postgres"
      - "-c"
      - "track_activity_query_size=1048576"
# ...

If you do not use docker, you can set the setting at /var/lib/postgresql/data/postgresql.conf . Be sure to restart database to apply the setting. You can use this query to check if was applied:

SHOW track_activity_query_size;

Answer 5

Get your postgres.conf file path using below command

psql -U postgres -c 'SHOW config_file'

Or you are using the root user then simply

SHOW config_file;

It will output something like

/var/lib/pgsql/data/postgresql.conf # Output of above command

then just edit the file using vim and change the below parameter to let's say 16kb

track_activity_query_size=16384

And restart your Postgres server

After that if you run SELECT current_query FROM pg_stat_activity; it will show you the more query but it will truncate till 16KB you can increase the size that you want.

Answer 6

you can just enable statement logging in postgresql (log_statement), and check the logs.

Answer 7

If you run a Google Cloud SQL instance, you can configure track_activity_query_size in Edit Instance --> Flags section.

I personally set it to 32786 .