Database Row-Locking Problem on Objectel (Doc ID 1105163.1)

Last updated on AUGUST 10, 2016

Applies to:

Oracle Communications Objectel - Version 2.10.1 and later
Information in this document applies to any platform.
***Checked for currency on 21-03-2013***


To understand the problem, you might consider that:

1 - There was an external system accessing the Objectel database tables.
2 - When two or more process access a Database table can cause a row lock level due to the transactional architecture of Oracle Database.

To avoid concurrency and consistence problems, Oracle's Database supports a powerful set of isolation level configuration. Each isolation level is defined on the terms of different concurrency/consistence problems. These phenomena/problems are listed below:

1 - Dirty Read
2 - NonRepeatable Read
3 - Phantom Read
There are four isolation level defined in ANSI/SQL. Each isolation level can avoid one or more phenomenas. The four isolation levels are:

1 - Read Uncommitted
2 - Read Committed
3 - Repeatable Read
4 - Serializable
One of the isolation levels supported by Oracle is the serializable one. The serializable level can avoid all 3 phenomena. However, it (like the same already means) will process everything in series. This means that on process will lock the row that it is processing until it finished the transaction.

For extra information about the concurrency, consistence and isolation levels please refer to:
Ask Tom: On Transaction Isolation Levels (Nov 2005)
Note that Objectel Servers uses a similar approach to keep its consistence. The approach used by Objectel is using triggers to keep each Objectel server away from another server's transaction. However, Objectel only controls its servers. It will not control external processes; this means that these processes can cause a lock into one of the internal tables that Objectel uses to do their jobs.


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