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Oracle10g Grid Computing with RAC
Chapter 12 - RAC Design Considerations

Disabling Table Locks for Individual Tables

Users attempting to lock tables with disabled locks receive an error. To re-enable table locking, use the following statement:

ALTER TABLE table_name ENABLE TABLE LOCK

Using this syntax forces all currently executing transactions to commit before enabling the table lock. The statement does not wait for new transactions to start after issuing the ENABLE statement. The disadvantage to this statement is that it must be executed for all tables that may experience improper locking.

To determine whether a table in the schema has its table lock enabled or disabled, query the table_lock column in the user_tables data dictionary table. If select privilege is on dba_tables, then the table lock state of other user’s tables can be queried as well. Use the all_tables views to see the locking state of tables for which you have been granted select privileges.

Setting dml_locks to Zero

Using the dml_locks initialization parameter, table locks can be set for an entire instance. This will disable the DROP TABLE, create INDEX, and LOCK TABLE commands. If these commands are not needed, then set dml_locks to zero to minimize lock conversions and achieve maximum performance. DDL statements cannot be executed against tables with disabled locks.


For more information, see the book Oracle 11g Grid and Real Application Clusters 30% off if you buy it directly from Rampant TechPress . 

Written by top Oracle experts, this RAC book has a complete online code depot with ready to use RAC scripts.


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Our remote Oracle DBA service provides 100% of the remote Oracle database administration needs for your company, and includes 24x7 access to our staff of 100% OCP Certified Oracle DBAs. 

We require a 12 month service commitment and include the following services:

  • Initial configuration review and problem identification
  • Installation of Oracle statistics collection mechanisms and quarterly database growth summaries
  • Hourly monitoring of your Oracle database for pending problems
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  • Twenty Four hour Oracle emergency support
  • Reporting and resolving all serious Oracle alert log messages
  • Free use of the BC TablePack, ServerPack and AuditPack services
  • Quick response emergency support for production database outages
  • Four hours of free remote DBA support every month. You can use these free hours for any DBA activity, including database analysis, system design, production migrations or personal mentoring.

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