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4D v20 R7
4D SQL Reference
SQL Commands
LOCK TABLE

LOCK TABLE  


 

 

 Command LOCK TABLLOCK TABLE sql_name IN {EXCLUSIVE | SHARE} MODE

The LOCK TABLE command is used to lock the table named sql_name in either EXCLUSIVE or SHARE mode.

In EXCLUSIVE mode, the data of the table cannot be read or modified by another transaction.

In SHARE mode, the data of the table can be read by concurrent transactions but modifications are still prohibited.

Example  

This example locks the MOVIES table so that it can be read but not modified by other transactions:

LOCK TABLE MOVIES IN SHARE MODE



See also 

ALTER TABLE
UNLOCK TABLE

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4D SQL Reference ( 4D v20 R7)