Re:select for update...

From: <dgoulet_at_vicr.com>
Date: Wed, 09 May 2001 10:26:55 -0700
Message-ID: <F001.002FE246.20010509101055@fatcity.com>

Suzy,

Select for update establishes a row shared lock on the affected rows as they become part of the active dataset. This can have the effect of locking out users who also want to delete or update these rows. It does not have an affect of users reading the data.

Dick Goulet

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Author: SuzyV <lvordos_at_datsit.com>
Date:       5/9/2001 8:26 AM

What are the negatives of using 'select for update'? Seem to recall it locks all rows within a block causing other transactions to wait on rows needed in the same block. What about performance impacts??
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Author: SuzyV
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