Re: Reset DB stats suggestion pg_stat_reset()

On 2/23/20 10:19 AM, Adrian Klaver wrote:
> On 2/22/20 6:40 PM, postggen2020 s wrote:
>> Thanks Adrian.
>> I am aware about the functions. Here need is, can we use this?.or is 
>> there any known effects after firing the functions?.
> 
> Yes the stats counters will be reset to 0, which means the planner will 
> not have accurate statistics to work with. That can be corrected with an 
> ANALYZE. 

I should have listened to the little voice that told me to confirm the 
above. The reset will reset the counters in the tables listed here:

https://www.postgresql.org/docs/12/monitoring-stats.html#MONITORING-STATS-VIEWS

It does not change the statistics here:

https://www.postgresql.org/docs/12/catalog-pg-statistic.html

Therefore an ANALYZE is not strictly required.

The questions below still hold though.

The questions I have are:
> 
> What is the issue you are trying to deal with?
> 
> Also why do you think resetting the stats will fix it?
> 
> 
>>
>> Thanks,
>> Postgann.
>>
>> On Sat, Feb 22, 2020 at 10:47 PM Adrian Klaver 
>> <adrian.klaver@aklaver.com <mailto:adrian.klaver@aklaver.com>> wrote:
>>
>>     On 2/22/20 12:26 AM, postggen2020 s wrote:
>>      > Hi Team,
>>      >
>>      > Good Afternoon,
>>      >
>>      > We have seen some deadlocks and tempfile count in
>>     pg_stat_database view.
>>      > We are trying to reset the stats.
>>      > Can we use pg_stat_reset() function to reset these stats 
>> without any
>>      > impact stats of databases.
>>      > Please advise the process to reset the stats.
>>
>>     See here:
>>
>>     https://www.postgresql.org/docs/12/monitoring-stats.html
>>
>>     Table 27.20. Additional Statistics Functions
>>
>>     It details what your options are.
>>
>>      >
>>      > Thanks.
>>      > Postggen.
>>
>>
>>     --     Adrian Klaver
>>     adrian.klaver@aklaver.com <mailto:adrian.klaver@aklaver.com>
>>
> 
> 


-- 
Adrian Klaver
adrian.klaver@aklaver.com