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  disable table lock tips

Oracle Database Tips by Donald BurlesonApril 7, 2015

Question:  How do I lock-down my production tables such that I am the only person who can run DDL against a production table?  How can I use the "alter table xxx disable table lock syntax?

Answer:  To prevent users from acquiring individual table locks, the following statement can be used:

ALTER TABLE table_name DISABLE TABLE LOCK

When users attempt to lock tables with disabled locks, they will receive an error. To re-enable table locking after a transaction, the following statement can be used:

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, the table_lock column in the dba_tables data dictionary table should be queried. If SELECT privilege is on dba_tables, the table lock state of other user's tables can be queried as well. The dba_tables views can be used to see the locking state of tables for which a user has been granted SELECT privileges.

The disable table lock command will prevent all DDL (including "truncate" commands against a production table:

alter table xxx disable table lock;

Then, all DDL with throw an ORA-00069 error:

SQL> truncate table mytab;

truncate table mytab
ORA-00069: cannot acquire lock — table locks disabled for mytab

The "alter table xxx disable table lock" command is used with the "revoke DBA" privilege command to ensure that only the DBA can change a production table.  The disable table lock command is an excellent safeguard for production tables.  The following script will disable all production tables for the SCOTT schema

connect scott/tiger;

spool /tmp/disable_table_lock.sql

select
   alter table scott.||table_name||' disable table lock;'
from
   user_tables;

spool off;

@/tmp/disable_table_lock

   
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