| From: | Alvaro Herrera <alvherre(at)2ndquadrant(dot)com> |
|---|---|
| To: | Amit Kapila <amit(dot)kapila16(at)gmail(dot)com> |
| Cc: | sk(at)zsrv(dot)org, vik(dot)fearing(at)2ndquadrant(dot)com, Haribabu Kommi <kommi(dot)haribabu(at)gmail(dot)com>, Peter Eisentraut <peter(dot)eisentraut(at)2ndquadrant(dot)com>, Michael Paquier <michael(at)paquier(dot)xyz>, Magnus Hagander <magnus(at)hagander(dot)net>, Robert Haas <robertmhaas(at)gmail(dot)com>, Fujii Masao <masao(dot)fujii(at)gmail(dot)com>, Ashutosh Sharma <ashu(dot)coek88(at)gmail(dot)com>, Euler Taveira <euler(at)timbira(dot)com(dot)br>, pgsql-hackers <pgsql-hackers(at)postgresql(dot)org>, Simon Riggs <simon(at)2ndquadrant(dot)com>, Dave Page <dpage(at)pgadmin(dot)org> |
| Subject: | Re: New function pg_stat_statements_reset_query() to reset statistics of a specific query |
| Date: | 2018-11-28 13:43:35 |
| Message-ID: | 20181128134335.fgrhuhw66ggwzusa@alvherre.pgsql |
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| Lists: | pgsql-hackers |
On 2018-Nov-28, Amit Kapila wrote:
> The problem with this idea is that if someone specifies a particular
> parameter using query and the query doesn't return any parameters,
> then it can lead to inadvertent behavior. For example, if user uses
> something like pg_stat_statements_reset(<valid_user_id>,
> <valid_db_id>, SELECT s.queryid FROM pg_stat_statements AS s WHERE
> s.query = 'SELECT $1 AS "ONE"'); now, if the query doesn't return any
> row, we will remove the stats for all queries that belong to
> (userid,dbid). It could be surprising for some users, that's why we
> came up with option-4 where we keep the default value of parameters as
> 0.
Right, I think option 4 is a clear improvement over option 1. I can get
behind that one. Since not many people care to vote, I think this tips
the scales enough to that side.
Thanks for your patience.
--
Álvaro Herrera https://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services
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