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Good question.
In most cases, eliminating keyed access path maintenance and doing it after
the fact is (much) faster. Where it isn't is when you are just adding
records to the existing file and don't really need to rebuild the access
path for the entire file (original records are already in the access path).
This is one case where CHGLF *DLY may hold an advantage to RMVM or CHGLF
*REBLD.
And yes, LFs are unusable until they're fully rebuilt, but the overall time
for the CPYF processing drops down.
BTW Charles, don't forget that constraints are implemented as a binary radix
index as well (primary key, unique constraint, foreign key constraint). And
DDS PF can have a non-unique key. All of these access paths are maintained
in real-time so you may want to eliminate their maintenance as well.
Elvis
Celebrating 11-Years of SQL Performance Excellence on IBM i, i5/OS and
OS/400
www.centerfieldtechnology.com
-----Original Message-----
Subject: Re: Looking for a faster CPYF
<snip>
automatically removing LF members for the copy and readding afterwards.
</snip>
Is this truly faster? So, sure, the CPYF command may be done but are the
logicals unusable for a long period afterwards because there are system
tasks like QDBSRV.. at the bottom of the WRKACTJOB rebuilding the indexes?
Rob Berendt
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