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Archives of the TeradataForum
Message Posted: Wed, 13 Jul 2005 @ 09:23:11 GMT
| Subj: | | Re: Is blocking of request expensive |
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| From: | | Victor Sokovin |
| | We have a situation where lots of transaction are blocking other transaction. i.e at the same time we try to update/insert/delete on a same
set of tables from different source. Will this cause a huge overhead to the teradata box ? | |
TD is designed to keep the overhead within limits. Transaction queues and locks are not infinite. When the system hits the limits you will find
a lot of failed transactions, restarting of which might become an overhead for the applications. So, this is something to have in mind when you
monitor the number of active transactions and locks.
To avoid blocking try to use row-level locks rather than table-level ones. It is not always possible for users to decide which level the system
should opt for but it is worth trying to follow the standard recommendations and maximize the chances for row-level locks. The topic is difficult
but well covered in the manuals and the archives of this forum.
Regards,
Victor
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