Обсуждение: Limit on updates made in a transaction
Hi, Is there is any limit on the number of updates made to a postgreSQL database in a single transaction? If yes, how can we get around this problem? For example, we need to update a field of many existing rows in a table triggered by the addition of a new row. If anything fails in the update process, we'd like to undone everything (including the addition of the new row). Thanks in advance for any info!
Use transactions
If you have it stored in a transaction you can rollback the whole
transaction on any error
Begin;
INSERT INTO foo VALUES ('bar');
INSERT INTO foo's VALUES ('bar'); <-- produce error
Rollback;
Now foo will not have the row bar in it
HTH
On 26 Jul 2002, Kent Tong wrote:
> Hi,
>
> Is there is any limit on the number of updates made to a
> postgreSQL database in a single transaction? If yes, how
> can we get around this problem? For example, we need to
> update a field of many existing rows in a table triggered
> by the addition of a new row. If anything fails in the
> update process, we'd like to undone everything (including
> the addition of the new row).
>
> Thanks in advance for any info!
>
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--
Darren Ferguson
On Saturday 27 Jul 2002 4:25 am, Kent Tong wrote: > Hi, > > Is there is any limit on the number of updates made to a > postgreSQL database in a single transaction? No - although since the machine needs to be able to rollback the updates you could run out of resources on the machine. > If yes, how > can we get around this problem? For example, we need to > update a field of many existing rows in a table triggered > by the addition of a new row. If anything fails in the > update process, we'd like to undone everything (including > the addition of the new row). No problem - that's what the system is designed for. - Richard Huxton