Re: PostgreSQL Tuning and running a query on a big data

On 11/17/20 11:34 AM, Sachin Kumar wrote:
> Hi Experts,
>
> 1.   I require guidance in tuning my PostgreSQL server installed on
> Windows 2016 Server. Please help me out with the configuration. or a url
> to ture PostgreSQL Server
>
> I am not able to find an expert who can help me in Postgres, that why I am
> asking too many questions. I will be really grateful if you can help me out.
>
>
> 2.   I have to upload a 5 GB file into a Table. Will it allow a 5GB file
> to be uploaded? or I have to increase the tablespace of the particular table.

Postgres auto-expands files as needed.

>
> 3.   while running the query on 1 million cards it is taking too much
> time, say 150 min. is there any way I can reduce it.
> *Query I am using*
> UPDATE hk_card_master_test m
> SET "ACCOUNT_NUMBER" = v."v_account_number", "ISSUANCE_NUMBER" =
> v."v_issuance_number","cron"=1
> FROM (
> SELECT h."id",h."CARD_SEQUENCE_NUMBER" ,h."ACCOUNT_NUMBER"
> ,h."ISSUANCE_NUMBER",c."ACCOUNT_NUMBER"
> v_account_number,c."ISSUANCE_NUMBER" v_issuance_number
> FROM
> hk_card_master_test h
> JOIN
> vdaccount_card_bank c
> ON SUBSTR(c."ACCOUNT_NUMBER", 1, 10) = h."CARD_SEQUENCE_NUMBER"
> ORDER BY h."id" ASC LIMIT 1000
> ) AS v
> WHERE m."CARD_SEQUENCE_NUMBER" = v."CARD_SEQUENCE_NUMBER";

Did you put indices on m."CARD_SEQUENCE_NUMBER and
SUBSTR(c."ACCOUNT_NUMBER", 1, 10)?

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