Thread: Better way to find long-running queries?
This query works, and works quite well, but fails if the query starts with a comment.
So far, I've accepted that "false negative" error, because being too aggressive at finding the word SELECT in a query is a worse problem. (For example, the string "select" might be in a column name that's part of a long-running COPY or ALTER.)
But I've always hoped for something better. Thus: is there any way in SQL to parse pg_stat_activity.query for the purpose of excluding comments?
PG versions 9.6.24 (yes, it's EOL), 14.12, 15.7 and 16.3, if it makes a difference.
SELECT datname,
pid,
client_addr,
client_hostname,
query_start,
to_char(EXTRACT(epoch FROM now()-query_start), '99,999.99') as elapsed_secs,
md5(query)
pg_stat_activity
WHERE datname not in ('postgres', 'template0', 'template1')
AND state != 'idle'
AND client_hostname !~ 'db[1-8].example.com'
AND EXTRACT(epoch FROM now() - query_start) > 1800
AND SUBSTRING(upper(query) from 1 for 6) = 'SELECT';
pid,
client_addr,
client_hostname,
query_start,
to_char(EXTRACT(epoch FROM now()-query_start), '99,999.99') as elapsed_secs,
md5(query)
pg_stat_activity
WHERE datname not in ('postgres', 'template0', 'template1')
AND state != 'idle'
AND client_hostname !~ 'db[1-8].example.com'
AND EXTRACT(epoch FROM now() - query_start) > 1800
AND SUBSTRING(upper(query) from 1 for 6) = 'SELECT';
Well, in the past I have approached it from the other end:
(AND query NOT ILIKE ('insert') AND query NOT ILIKE...)
excluding queries I didn't care about
--
Scott Ribe
scott_ribe@elevated-dev.com
https://www.linkedin.com/in/scottribe/
> On Jul 11, 2024, at 10:03 AM, Ron Johnson <ronljohnsonjr@gmail.com> wrote:
>
> This query works, and works quite well, but fails if the query starts with a comment.
>
> So far, I've accepted that "false negative" error, because being too aggressive at finding the word SELECT in a query
isa worse problem. (For example, the string "select" might be in a column name that's part of a long-running COPY or
ALTER.)
>
> But I've always hoped for something better. Thus: is there any way in SQL to parse pg_stat_activity.query for the
purposeof excluding comments?
>
> PG versions 9.6.24 (yes, it's EOL), 14.12, 15.7 and 16.3, if it makes a difference.
>
> SELECT datname,
> pid,
> client_addr,
> client_hostname,
> query_start,
> to_char(EXTRACT(epoch FROM now()-query_start), '99,999.99') as elapsed_secs,
> md5(query)
> pg_stat_activity
> WHERE datname not in ('postgres', 'template0', 'template1')
> AND state != 'idle'
> AND client_hostname !~ 'db[1-8].example.com'
> AND EXTRACT(epoch FROM now() - query_start) > 1800
> AND SUBSTRING(upper(query) from 1 for 6) = 'SELECT';
>
Not even queries with CTEs will be found this way. They start with "with".
A space at the beginning will also miss it.
A space at the beginning will also miss it.
Am 11. Juli 2024 18:03:22 MESZ schrieb Ron Johnson <ronljohnsonjr@gmail.com>:
This query works, and works quite well, but fails if the query starts with a comment.So far, I've accepted that "false negative" error, because being too aggressive at finding the word SELECT in a query is a worse problem. (For example, the string "select" might be in a column name that's part of a long-running COPY or ALTER.)But I've always hoped for something better. Thus: is there any way in SQL to parse pg_stat_activity.query for the purpose of excluding comments?PG versions 9.6.24 (yes, it's EOL), 14.12, 15.7 and 16.3, if it makes a difference.SELECT datname,
pid,
client_addr,
client_hostname,
query_start,
to_char(EXTRACT(epoch FROM now()-query_start), '99,999.99') as elapsed_secs,
md5(query)
pg_stat_activity
WHERE datname not in ('postgres', 'template0', 'template1')
AND state != 'idle'
AND client_hostname !~ 'db[1-8].example.com'
AND EXTRACT(epoch FROM now() - query_start) > 1800
AND SUBSTRING(upper(query) from 1 for 6) = 'SELECT';