Re: SQL lock record?

[Vern Hamberg <hambergv@xxxxxxxxxxxxxx>]

Dan

At 09:09 AM 12/4/97 -0500, you wrote:
>Does the execution of an SQL statement (either from an ODBC client or from
>being embedded in an RPG program) lock the record(s) it selects?
>
>If it does, what needs to be done to free up the file(s) and/or the
>record(s) affected?

Don't know if you'd got any reply yet.

DELETE & UPDATE acquire EXCLUSIVE locks during execution. These are
releases at the next COMMIT, or upon completion, if commitment control is
not in force.

INSERT acquires EXCLUSIVE locks only when commitment control is in force.
Otherwise, no locking is used.

Don't know about the FOR UPDATE OF clause, which, BTW, is AS/400-specific.

Record locking in SQL is closely tied to commitment control.

There is a LOCK TABLE statement available.

HTH

Vernon Hamberg
Systems Software Programmer
Old Republic National Title Insurance Company
400 Second Avenue South
Minneapolis, MN 55401
(612) 371-1111 x480


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