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* index auto changes after copying data ?
@ 2005-11-29 07:00 energumen@buaa.edu.cn <energumen@buaa.edu.cn>
0 siblings, 2 replies; 3+ messages in thread
From: energumen@buaa.edu.cn @ 2005-11-29 07:00 UTC (permalink / raw)
To: pgsql-performance
I know in mysql, index will auto change after copying data
Of course, index will change after inserting a line in postgresql, but what about copying data?
^ permalink raw reply [nested|flat] 3+ messages in thread
* Re: index auto changes after copying data ?
@ 2005-11-29 12:16 Richard Huxton <dev@archonet.com>
parent: energumen@buaa.edu.cn <energumen@buaa.edu.cn>
1 sibling, 0 replies; 3+ messages in thread
From: Richard Huxton @ 2005-11-29 12:16 UTC (permalink / raw)
To: energumen@buaa.edu.cn <energumen@buaa.edu.cn>; +Cc: pgsql-performance
energumen@buaa.edu.cn wrote:
> I know in mysql, index will auto change after copying data
> Of course, index will change after inserting a line in postgresql, but what about copying data?
The index will (of course) know about the new data.
You might want to ANALYZE the table again after a large copy in case the
statistics about how many different values are present changes.
--
Richard Huxton
Archonet Ltd
^ permalink raw reply [nested|flat] 3+ messages in thread
* Re: index auto changes after copying data ?
@ 2005-11-29 18:48 Chris Browne <cbbrowne@acm.org>
parent: energumen@buaa.edu.cn <energumen@buaa.edu.cn>
1 sibling, 0 replies; 3+ messages in thread
From: Chris Browne @ 2005-11-29 18:48 UTC (permalink / raw)
To: pgsql-performance
energumen@buaa.edu.cn ("energumen@buaa.edu.cn") writes:
> I know in mysql, index will auto change after copying data Of
> course, index will change after inserting a line in postgresql, but
> what about copying data?
Do you mean, by this, something like...
"Are indexes affected by loading data using the COPY command just as
they are if data is loaded using INSERT?"
If so, then the answer is "Yes, certainly." Indexes are updated
whichever statement you use to load in data.
--
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http://www.ntlug.org/~cbbrowne/finances.html
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2005-11-29 07:00 index auto changes after copying data ? energumen@buaa.edu.cn <energumen@buaa.edu.cn>
2005-11-29 12:16 ` Richard Huxton <dev@archonet.com>
2005-11-29 18:48 ` Chris Browne <cbbrowne@acm.org>
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