2015-03-08 10:04 GMT+01:00 Nicolas Paris <niparisco@xxxxxxxxx>:
Thanks.Then,Is it a good idea to run multiple instance of "create index on tableX" on the same time ? Or is it better to do it sequentially ?In other words : Can one seq scan on a table benefit to multiple create index stmt on that table ?
It usually is a good idea to parallelize index creation. That's one of the good things that pg_restore does since the 8.4 release.
Nicolas PARIS2015-03-07 12:56 GMT+01:00 Guillaume Lelarge <guillaume@xxxxxxxxxxxx>:Le 7 mars 2015 11:32, "Nicolas Paris" <niparisco@xxxxxxxxx> a écrit :
>
> Hello,
>
> I wonder if the process of index creation can benefit from other indexes.
>It cannot.
> EG: Creating a partial index with predicat based on a boolean column, will use an hypothetic index on that boolean column or always use a seq scan on all rows ?
>Nope, it always does a seqscan.
> Goal is to create partial indexes faster.
>
> Explain command does not work with Create index.
>You cannot use EXPLAIN on most DDL commands.
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