max online Q engines

(Process mode only) max online Q engines specifies the maximum number of Q engines you can have online, and is required for MQ (see the Active Messaging Users Guide).

Summary Information
Default value	0
Range of values	0 – 127
Status	Static
Display level	Comprehensive
Required role	System administrator
Configuration group	Processors

The maximum number of Q engines depends on the value of max online engines:

max online Q engines cannot be greater than max online engines minus number of engines at startup. That is, if the value for max online engines is 57, and the value for number of engines at startup is 28, the value for max online Q engines cannot be greater than 29.
Setting max online Q engines reserves the high range of max online engines for Q engines. Once you set max online Q engines, SAP ASE engines can no longer use the engines in the range that is reserved for Q engines. For example, if you set max online engines to 10 and set max online Q engines to 4:
- SAP ASE issues an error if you attempt to bind an engine group to engines 6, 7, 8, or 9
- You cannot change the value of number of engines at startup to 7, 8, or 9
- You cannot add engines 6, 7, 8, or 9 to an engine group

Because setting max online Q engines may affect existing production environments, SAP recommends that you increase the value of max online engines by the same amount that you increase max online Q engines. For example, if you increase max online Q engines by 4, also increase max online engines by 4.