REWRITE ADD - Teradata Unity

Purpose

Adds query rewrite patterns.

Parameters

id

A unique string to identify the specific Rewrite Rule.

input regexp

The Tool Command Language (TCL) regular expression that enables matching SQL from a client.

To make sure that only the SQL required is matched, make the input regexp pattern be as specific as possible. Include a ^ at the beginning and a $ at the end of each pattern.

output regexp

The SQL regular expression that Unity generates and sends to Teradata.

Example

The following rewrite pattern forces all selected files on table myDb.myTable that does not have a where clause to use ACCESS locks.

unityadmin>  REWRITE ADD forceAccessOnMyTable "^SELECT(.*)FROM myDb.myTable$" "LOCKING TABLE myDb.myTable FOR ACCESS SELECT \1 FROM myDb.myTable"; 
Rewrite rule add request completed successfully