Querying over pg_stat_activity with clauses in a trigger can be quite
expensive if your write transaction rate is high.
You may want to look into the current_query() function documented at
https://www.postgresql.org/docs/current/static/functions-info.html
On 10/05/18 11:44, Pavel Stehule wrote:
2018-05-10 12:42 GMT+02:00 a <372660...@qq.com <mailto:372660...@qq.com>>:
Thanks a lot, would you please be so kind to tell me more about what
is top level query??
for example - if you run some queries from PLpgSQL functions (triggers),
then these queries are not top queries.
Regards
Pavel
------------------ Original message ------------------
*From:* "Pavel Stehule"__;
*Sendtime:* Thursday, May 10, 2018 6:38 PM
*To:* "a"<372660...@qq.com <mailto:372660...@qq.com>>;
*Cc:* "pgsql-general"__;
*Subject:* Re: How do I get the SQL statement in a trigger?
Hi
2018-05-10 12:23 GMT+02:00 a <372660...@qq.com
<mailto:372660...@qq.com>>:
Hi I would like to write a trigger that recorded every sql
statement under the effected entry. So if it is possible to
retrieve the sql statement within a trigger??
You can read a tom command from pg_stat_activity table
postgres=# select query from pg_stat_activity where pid =
pg_backend_pid();
+------------------------------------------------------------------+
| query |
+------------------------------------------------------------------+
| select query from pg_stat_activity where pid = pg_backend_pid(); |
+------------------------------------------------------------------+
(1 row)
But this information is available only for top level query.
Regards
Pavel
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Regards
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Data Services Department
Ocado Technology
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