Transaction on table with index

Hello!

Is it possible - the blocking of entire index block for "enq: TX - line lock conflict" on the table (in the case of table organized bunch)
in other words, if blocking a row in the table causes blocking of any block of an index?

Thank you and best regards,
Pavel

Published by: Pavel on 3 may 2012 12 h 30

Pavel wrote:
Hello!

Is it possible - the blocking of entire index block for "enq: TX - line lock conflict" on the table (in the case of table organized bunch)
in other words, if blocking a row in the table causes blocking of any block of an index?

You must use the words with great care in this case. The answer to your question is no - the "index block' is not 'blocked' when you see a ' enq: TX - line lock conflict. Some characteristics of the data manipulated by a transaction requires another transaction to wait for the first transaction to the commit or rollback. When track down you the TX lock and he expects in lmode 4, there are several possible causes - many of them associated with index, or index organized table or referential integrity. (There are a couple of management of space related inside - but most of these appear with a different expectation.)

If you are "updated" an index entry you actually remove a single entry and insert another - another session could end up waiting at EACH end of this process for you. Generally, it will be on the unique constraints - the other process might want to of "re - insert" line you just deleted and must wait to make sure that you do not have rear roller, or she might want to insert the value you insert - in which case he must wait in case you commit (and must raise the "double key") or restore you (and it can go forward).

There are many other combinations of simultaneous action - but I'll leave this as an exercise for you or other readers, to work on.

Concerning
Jonathan Lewis

Tags: Database

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