Hi,
A small question ... and your opinions are well done ...
I have tested one thing today ...
I have a script in charge to insert a lot of files inside one of my db.
I have a perl script where I read the files ... check if some similar data are
in the db ... then delete them ... and insert the contains of the file.
I do this file by file, and each time I make a transaction where I delete the
data first (one delete command) and insert the new data with one insert by
line ... then I commit and check the next file ...
My file have between 200 to 5000 lines each times ... in my test I have about
650 000 lignes in total ...
I have a dedicated partition on the disk for the WAL files, 2Gb.
So I start my script and saw the size of the pg_xlog partition groing quickly
to be full after 20 min ...
So ... I think it's my checkpoint_timeout who is too large ... I look at my
config file and I see :
#checkpoint_timeout = 300
So default ... it's not set ... and the default value seems to be 300 ... (I
have tested after).
My question is simple ... if I reduce the time of the checkpoint_timeout ...
what is the impact in normal use of my database ... does someone have done
any test ? ...
Is it possible in futur version to change somewhere in realtime this value
just for big insert like this ... or this idea have no sence ?
Thanks for your reply,
Regards,
--
Hervé Piedvache
Elma Ingénierie Informatique
6 rue du Faubourg Saint-Honoré
F-75008 - Paris - France
Pho. 33-144949901
Fax. 33-144949902
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TIP 9: the planner will ignore your desire to choose an index scan if your
joining column's datatypes do not match
