That's a cool idea, Craig.  You buy yourself a beer for that one.  8-)

-----Original Message-----
From: HP-3000 Systems Discussion [mailto:[log in to unmask]] On
Behalf Of Craig Lalley
Sent: Thursday, May 18, 2006 10:06 AM
To: [log in to unmask]
Subject: Re: [HP3000-L] purgegroup

Kent Wallace <[log in to unmask]> wrote:Both MPE/XL purge and
MPEX YESPURGE were taking large amounts of
resources to purge the file, the "PURGEGROUP" worked in a few minutes.
Kent,

I am sure you are familiar with this, but maybe it will help out other
sites.

On each volume set there are two (2) Transaction Manager Logfiles.   A
User XM log, which everyone is familiar with and a System XM log which
monitors directory structure changes.

The System XM log is much smaller, 16mb I believe. 

When a file is purged in the begining of the group (begining of the
alphabit), all the record pointers for all the preceding files need to
be updated.   This has a tendancy to fill up the System XM log quickly,
causing system overhead and is very slow.

The trick is to purge them in reverse order, from the back of the
alphabit, so to speak.

So to speed up the purge, try doing a 

:LISTF @,6 > MYOUT

reverse sort MYOUT
change 1 to "PURGE ", all

xeq MYOUT

This should go a lot faster.

HTH,

-Craig

		
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