vms_tdb performance against unexpected.tdb
Dave Jones
JONESD at er6s1.eng.ohio-state.edu
Fri Oct 24 15:38:19 GMT 2003
In a previous thread, I noted the performance degradation brought about by
excessive I/O's in scanning unexpected.tdb. Over time, the contiual adding and
deleting of records by nmbd to this file makes sequential scanning of the
records extremely inefficient. At first, I thought the problem was just the
index tree becoming fragmented, but further study shows that it is the deleted
data records themselves causing the problem.
As far as I can tell, there is no way to clean up the data area on an open
file. You have to convert/reclaim the file (which requires exclusive access).
------------------------------------------------------------------------------
David L. Jones | Phone: (614) 292-6929
Ohio State University | Internet:
140 W. 19th St. Rm. 231a | jonesd at er6s1.eng.ohio-state.edu
Columbus, OH 43210 | vman+ at osu.edu
Disclaimer: I'm looking for marbles all day long.
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