StmtCache database parameter

Description

Specifies whether SQL
statement caching is enabled on the client.

Controls

• I10 Informix

Syntax

Parameter	Description
value	Specifies whether SQL statement caching is enabled on the client. Values are: 0 SQL statement caching is disabled on the client. 1 SQL statement caching is enabled on the client.

Default

StmtCache=0

Usage

In IDS 9.2.1 and later, the database server uses the SQL statement cache (SSC) to store SQL statements across user sessions.
When any user executes a statement already stored in the SQL statement cache, the database
server does not parse and optimize the statement again, resulting
in improved performance. The statement must be a SELECT, UPDATE, DELETE,
or INSERT statement, and it cannot contain user-defined
routines.

There are several ways to configure caching on the server.
The SET STATEMENT CACHE statement
takes precedence over the STMT_CACHE environment variable
and the STMT_CACHE configuration parameter. You must enable
the SQL statement cache, either
by setting the STMT_CACHE configuration parameter or by
using the Informix onmode utility, before the SET
STATEMENT CACHE statement can execute successfully.

You can set the StmtCache DbParameter on the System tab page
in the Database Profile Setup dialog box for I10 connections to
turn SQL statement caching on or
off on the client. However, the server must be configured to support SQL statement caching before you
can access the cache from the client.

For more information about Informix SQL statement
caching, see the IBM Informix Dynamic Server Performance Guide
.

Examples

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