Am 19.09.2018 um 16:43 schrieb Durgamahesh Manne:
On Wed, Sep 19, 2018 at 8:02 PM Andreas Kretschmer
<andreas@xxxxxxxxxxxxxxx <mailto:andreas@xxxxxxxxxxxxxxx>> wrote:
Am 19.09.2018 um 15:51 schrieb Durgamahesh Manne:
> I have created BRIN index on few columns of the table without any
> issues. But i am unable to create BRIN index on one column of the
> table as i got error listed below
>
>
> [local]:6263 postgres@huawei=# CREATE INDEX brin_idx on huawei
using
> brin ("dFetch");
> ERROR: data type boolean has no default operator class for access
> method "brin"
> HINT: You must specify an operator class for the index or define a
> default operator class for the data type.
honestly, a BRIN-Index on a bool-column doesn't make much sense.
What do
you want to achive? Maybe a partial index with a where-condition
on that
column makes much more sense.
Regards, Andreas
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Hi
I want to execute distinct query at less possible time
for that reason ,Even i have already tried with BTREE indexes & HASH
indexes on required columns .distinct query execution time was not reduced
select distinct sub_head."vchSubmittersCode" ,rec."vchFileName" ,
rec."vchCusipFundIDSubFundID" , rec."vchFundUnitPrice" ,
sub_head."vchValuationDate" ,rec."vchAdvisorLabel" from "table1" rec
join "table2" sub_head on
rec."vchSubmittersCode"=sub_head."vchSubmittersCode" where
rec."bFetch"=false and sub_head."bFetch"=false ;
Query taken around 7 minutes time to execute with BTREE indexes & HASH
indexes on required columns
try an index like
create index idx_t1 on table1 ("vchSubmittersCode") where "bFetch"=false
and
create index idx_t2 on table2 ("vchSubmittersCode") where "bFetch"=false
and check if the plan changed and the indexes are in use. You can use
create index concurrently to prevent lockings.
Regards, Andreas
--
2ndQuadrant - The PostgreSQL Support Company.
www.2ndQuadrant.com
