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Message Posted: Mon, 28 Jan 2008 @ 23:15:57 GMT

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Subj:   Re: Locking Row for Access Stmt
From:   Ballinger, Carrie

Both locking modifiers (table level access locking and row level access locking) allow a table to be read when it is undergoing update by another transaction.

The difference between the two is that the row level access lock only places an access lock on a single row-hash. This is a less expensive lock to apply, and is recommnended for requests that do single-AMP or group-AMP access.

The table level access lock places an access lock on the entire table. This is a more expensive lock to set because it involves all AMPs. So if you don't require all-AMP operations against the table being locked, use the less intrusive, row hash level access lock.

Thanks, -Carrie

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