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This section contains information that is specific to the database type Sybase IQ.

Note!

The Sybase IQ database type requires jConnect v16.0 and later. 

Supported Functions

The Sybase IQ database can be used with:

  • Database Table Related Functions (APL)

  • APL function sqlexec 

  • Database Collection/Forwarding Agents

  • Event Notifications

  • SQL Collection/Forwarding Agents

  • SQL Loader Agent

  • Task Workflows Agents (SQL)

Preparations

The Sybase JDBC driver that is included in the SDK has to be downloaded to the Platform in order to connect to a Sybase IQ database from .

You must proceed as follows:

  1. Go to the SAP Software Solutions web page for information about the SDK and included drivers:
    https://www.sap.com/index.html.

  2. Place the downloaded jar file in the $MZ_HOME/3pp directory.

  3. Restart the Platform and ECs.

Close Pooled Connections

  The APL function closePooledConnections enables you to close a pooled connection with the Sybase IQ server. This feature helps you eliminate invalid connections.

Note!

This function only closes inactive connections, regardless of how long the connections have been idle.  

int closePooledConnections
     (string dbProfile)

Parameters:

Returned Value

Description

dbProfile

The name of the database where the table is stored, preceded by the folder name.

Example - Using APL function closePooledConnections

persistent int profileUsageCnt; 
      .... 
      if ( profileUsageCnt > 100 ) { 
         closePooledConnections("sybase_iq.mydb"); 
         profileUsageCnt = 0; 
      }

Performance Tuning

The default maximum number of connections on an Execution Context is five. You can tune this number by setting the Execution Context property sybase.iq.pool.maxlimit in the relevant <pico>.conf file.

Example - Setting the maximum number of connections for Sybase IQ

$ mzsh topo set topo://container:<container>/pico:<pico name>/val:config.properties.sybase.iq.pool.maxlimit 20

There are two properties available for handling timeout of socket connections and socket threads:

sybase.jdbc.socketread.timeout with default value 180000 (3 minutes in milliseconds)

sybase.jdbc.socketconnect.timeout  with default value 30000 (30 seconds in milliseconds)

To specify other timeout values, in milliseconds, set the Execution Context properties in the relevant <pico>.conf file.

Example - Setting the timeout for a socket tied to a Sybase IQ connection

$ mzsh topo set topo://container:<container>/pico:<pico name>/val:config.properties.sybase.jdbc.socketread.timeout 600000 
$ mzsh topo set topo://container:<container>/pico:<pico name>/val:config.properties.sybase.jdbc.socketconnect.timeout 20000 

Note!

When using the timeout property you must ensure that you set a limit that exceeds your longest running query, otherwise, you might terminate a connection while it is executing a query.

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