Veritas File System 5.0 Administrator's Guide (September 2006)

DELETE statement

The DELETE file placement policy rule statement is very similar to the RELOCATE

statement in both form and function, lacking only the <TO> clause. File placement

policy-based deletion may be thought of as relocation with a fixed destination.

Note: Use DELETE statements with caution.

The following XML snippet illustrates the general form of the DELETE statement:

<FROM>

<CLASS>...placement_class_name...</CLASS>

</SOURCE>

...additional placement class specifications...

</SOURCE>

</FROM>

<WHEN>...relocation conditions...</WHEN>

</DELETE>

A DELETE statement contains the following clauses:

An optional clause that contains a list of placement classes from whose

volumes designated files should be deleted if the files meet the

conditions specified in the <WHEN> clause. No priority is associated

with the ordering of placement classes in a <FROM> clause. If a file to

which the rule applies is located on a volume in any specified

placement class, the file is deleted. If a DELETE statement does not

contain a <FROM> clause, VxFS deletes qualifying files no matter on

which of a file system's volumes the files reside.

<FROM>

An optional clause specifying the conditions under which files to which

the rule applies should be deleted. The form of the <WHEN> clause in

a DELETE statement is identical to that of the <WHEN> clause in a

RELOCATE statement. If a DELETE statement does not contain a

<WHEN> clause, files designated by the rule's SELECT statement, and

the <FROM> clause if it is present, are deleted unconditionally.

<WHEN>

DELETE statement examples

The following example illustrates the use of the DELETE statement:

171Dynamic Storage Tiering

File placement policy rules