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From [email protected] (Tom Lane)
Subject pgsql-server/src/backend/storage/smgr md.c
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Msg-id [email protected]
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CVSROOT:    /cvsroot
Module name:    pgsql-server
Changes by:    [email protected]    03/01/06 20:19:12

Modified files:
    src/backend/storage/smgr: md.c

Log message:
    Tweak mdnblocks() to avoid doing lseek() on segments that it has
    previously determined not to be the last segment of a relation.
    This reduces the expected cost to one seek, rather than one seek per
    segment.  We can get away with this because truncation of a relation
    will cause a relcache flush and so the md.c file descriptor will be
    closed; when it is re-opened we will re-determine the last segment.

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