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# Database Abstraction Layer

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v5:performance:expensivesql

# expensiveSql

##### Syntax

    mixed expensiveSql()

## Description

The function `expensiveSql()` returns a list of SQL statements with very high execution times collected by the performance monitor logSql feature.

## Usage

    /*
    * Connection to DB2 database
    */

    $perf = newPerfMonitor($db);

    /*
     * Enable logging
    */
    $db->logSql();

    /*
     * Execute invalid SQL statement
    */
    $SQL = "SELECT * FROM act where actno > 200";

    $db->execute($SQL);

    $h = $perf->expensiveSql()

    print $h;

### Expensive SQL

Tuning the following SQL could reduce the server load substantially

Load | Count | SQL | Max | Min

v5/performance/expensivesql.txt · Last modified: 2016/01/12 17:14 by mnewnham

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