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

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.

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";

Hi Ron,

Thanks for the revert,

Indices mean Indexes than yes I am using Indexes for teh table. if it is something else, can you help me with a simple query of indices which I can use in my code?

On Tue, Nov 17, 2020 at 11:10 PM Ron <ronljohnsonjr@gmail.com> wrote:

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)?

--
Angular momentum makes the world go 'round.

--

Best Regards,
Sachin Kumar

Sachin Kumar schrieb am 17.11.2020 um 18:34:
> 3.   while running the query on 1 million cards it is taking too much time, say 150 min. is there any way I can
reduceit. 
> *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";

The target table of an UPDATE shouldn't be repeated in the FROM clause in Postgres.

Not sure why you have the LIMIT in the sub-select, but if that is only for
testing purposes, then I think the following should do what you want, but much faster:

     UPDATE hk_card_master_test m
       SET "ACCOUNT_NUMBER" = v."v_account_number",
           "ISSUANCE_NUMBER" = v."v_issuance_number",
           "cron"=1
     FROM vdaccount_card_bank v
     WHERE SUBSTR(v."ACCOUNT_NUMBER", 1, 10) = m."CARD_SEQUENCE_NUMBER"

You probably want those indexes:

    create index on vdaccount_card_bank ( (SUBSTR("ACCOUNT_NUMBER", 1, 10) );
    create index on hk_card_master_test ("CARD_SEQUENCE_NUMBER");


Unrelated to your question, but using quoted/uppercase identifiers is generally discouraged in Postgres:

https://wiki.postgresql.org/wiki/Don't_Do_This#Don.27t_use_upper_case_table_or_column_names

you probably will have a lot less trouble if you get rid of those.

Thomas