Re: Row locks in DB2/400 UDB

["Narayanan R Pillai" <strqst400@xxxxxxxxx>]

Doc,

Is it feasible to use a single callable program to access and update the
counter table and that program locks the table for update?

Narayanan Pillai


----- Original Message -----
From: "E Doc" <doc6502@xxxxxxxxx>
To: <midrange-l@xxxxxxxxxxxx>
Sent: Friday, August 08, 2003 9:53 AM
Subject: Row locks in DB2/400 UDB


>
> All
>
> Is there a way to lock a row in DB2/400 UDB SQL without using commitment
control?
>
> We have a table that holds the 'next sequence number'.  Whenever several
processes access the table, we end up with a scenario like:
>
>   program A accesses the table and grabs
>     the next counter number (counter number = 50)
>
>   program B accesses the table and grabs
>     the next counter number (counter number = 50)
>
>   program B adds one to the counter
>     number, and updates the table (counter number = 51)
>
>   program A adds one to the counter
>     number, and updates the table (counter number = 51)
>
> Now, there are two transactions with an identical sequence number.
>
> We're doing a simple select to fetch the sequence number, and we are not
using commitment control.
>
> Any suggestions?
>
> Thanks
>
> -Doc
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