Re: New function pg_stat_statements_reset_query() to reset statistics of a specific query

On Fri, Nov 23, 2018 at 1:54 AM Peter Eisentraut <
peter(dot)eisentraut(at)2ndquadrant(dot)com> wrote:

> On 19/11/2018 06:18, Haribabu Kommi wrote:
> > Amit suggested another option in another mail, so total viable
> > solutions that are discussed as of now are,
> >
> > 1. Single API with NULL input treat as invalid value
> > 2. Multiple API to deal with NULL input of other values
> > 3. Single API with NULL value to treat them as current user, current
> > database
> > and NULL queryid.
> > 4. Single API with -1 as invalid value, treat NULL as no matching. (Only
> > problem
> > with this approach is till now -1 is also a valid queryid, but setting
> > -1 as queryid
> > needs to be avoided.
>
> Can you show examples of what these would look like?
>

Following are some of the examples how the various options
work.

Option -1:

select pg_stat_statements_reset(NULL,NULL,NULL);
-- No change, just return. Because the function is strict.

select pg_stat_statements_reset(10,10,NULL);
-- Resets all the statements that are executed by userid 10 on database id
10.

select pg_stat_statements_reset(NULL,10,NULL);
-- Resets all the statements executed on database id 10

Option - 2:

select pg_stat_statements_reset(NULL,NULL,NULL);
-- No change, just return. Function are of type strict.

select pg_stat_statements_reset(10,10,1234)
-- Resets the query statement 1234 executed by userid 10 on database id 10

select pg_stat_statements_reset_by_userid(10)
-- Resets all the statements executed by userid 10

select pg_stat_statements_reset_by_dbid(10);
-- Rests all the statements executed on database id 10.

select pg_stat_statements_reset_by_userid_and_dbid(10, 10);
-- Resets all the statements executed by userid 10 on datbase id 10

Likewise total 7 API's.

Option -3:

select pg_stat_statements_reset(NULL,NULL,NULL);
--Similar like option-1, but when the userid or databaseid are NULL, it uses
the current_role and current_database as the options. But for the queryid
when the options is NULL, it deletes all the queries.

Rest of the details are same as option-1.

Option -4:

select pg_stat_statements_reset(NULL,NULL,NULL);
-- No change, just return. Because the function is strict.

select pg_stat_statements_reset(0,0,0);
-- Resets all the statements

select pg_stat_statements_reset(0,10,0);
-- Resets all the statements executed on database id 10

select pg_stat_statements_reset(10,0,0);
-- Resets all the statements executed on userid 10.

Regards,
Haribabu Kommi
Fujitsu Australia