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Opening a high number of cursors in Sybase IQ

December 2, 2011

Introduction

If the number of scroll cursor open using the “with hold” option is bigger that the value of the iqgovern start up parameter, the server queue all new queries until the number of open cursors fall below the iqgovern parameter value.

This situation can happen if you are using reporting tools like Cognos.

The Cause

Look like Sybase IQ internally consider every open cursor as an active operation (active query)

The Solution

Increment the iqgovern parameter to a value bigger that the number of open cursor you are planning to have.

The risk

Risk of reducing performance due to less parallel processing

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From → SAP IQ

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