Hi Jayan!
Postgresql ANALYZE option is very useful: it calculate statistics for
the query optimizer. It is very speedy.
VACUUM is a lot slower and reclaims internal unused space. It is useful
if you have deleted a lot of data.
It does not make any data change or logical change. If the DSpace delete
does not clean its data correctly, VACUUM will not change anything.
I suspect DSpace may keep handle records to never reallocate handles to
different documents.
One way to do anything you want (at your own risks) is to use pgAdmin
III to make any change you need at SQL level.
Just remind that items are also indexed by Lucene and you will have to
run the DSIndexer if you change any text field.
Have a nice week-end!
Christophe
Jayan Chirayath Kurian a écrit :
Hi! Mika,
I was able to try backup and reinstate dspace. Thanks.
I deleted few items from DSpace. I believe their handle details still exist in postgres.
I executed VACUUMDB and then the display in the DOS command line was "VACCUM".
I hope the command was executed successfully. IS there any way to flush out the items
that are permanently deleted from DSPace. Does vacuumdb remove deleted collections/items
which are permanently deleted and not shown on the DSpace GUI collection/item interface.
Please suggest.
Thanks,
jayan
-----Original Message-----
From: Mika Stenberg [mailto:[EMAIL PROTECTED]
Sent: Tuesday, May 29, 2007 5:40 PM
To: Jayan Chirayath Kurian
Subject: Re: [Dspace-tech] Postgres optimizations
Hi,
Im using pg_dump to backup db:
pg_dump dspace > /dspace/dbbackup/dspace.db
And rsync to backup dspace-directory and assetsore
rsync -av --delete /usr/local/dspace-1.4/
/usr/local/dspace_backup/weekly/dspace-1.4/
Then my local backups are transferred to another server via WinScp
script, which if very useful. You can actually skip rsync if you use
Winscp with /synchronize option.
You could also Zip the contents to save some space.
Did this help?
-Mika
Hi! Mika,
Could you please suggest regarding how to take backups for DSpace
instances. I am using Dspace 1.4.1 on windows 2003.
Thanks,
Jayan
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Mika
Stenberg
Sent: Tuesday, May 29, 2007 4:13 PM
To: 'dspace-tech@lists.sourceforge.net'
Subject: [Dspace-tech] Postgres optimizations
Im hoping to get some hints for postgres performance optimization. Our
DSpace (1.4.1) has started to run really slow after the number of items
exceeded 40 000 (mainly metadata, few full texts only).
I tried increasing work_memory and max_fsm_pages in postgres.conf but
with little help. Im also running regular vacuum and reindex for the db.
Any help would be appreaciated,
-Mika
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