The validation process hung for a table only!

Hi all

There is a table contains 79 columns (with a cloumn CLOB) with about 100 000 record, sometimes a problem occurs only with this table (and only these days) when you attempt to insert, update, delete from this table, the validation process hung! Why? and how to solve? I can't say why this problem occurs.

We renamed the table and re-create using EXPDP, IMPDP orders, re-create triggers on it and repeat grants thereon to the roles that the previous, this procedure has solved the problem for maybe one day only, but the problem returns!

Notes:

This table is on a table space users, otherwise I use DB Oracle 11 g R2

> The question is: What does it mean the blocking locks? and why this problem occurs? and how to avoid it from happening again?

Have you read this:

https://docs.Oracle.com/CD/E18283_01/server.112/e16508/consist.htm

For example, this part:

Written in conflict read-committed Transactions

In a read committed transaction, a write conflict occurs when the transaction attempts to change an update by a simultaneous uncommitted transaction line, sometimes called a blocking transaction.

The read committed transaction awaits the transaction that blocks at the end and release his lock of line. The options are the following:

-If the blocking transaction is cancelled, the pending transaction then proceeds to change the locked row previously as if the other transaction never existed.

-If the blocking transaction is committed and frees its locks, then the transaction pending proceeds to update scheduled for the newly modified line.

> Where can I find this log file please?

For example:

C:\app\oracle\diag\rdbms\oracle\orcl\trace\alert_orcl.log

Kind regards

Zlatko

Tags: Database

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