StorageTek Lifecycle Director DB2 Manager 312564001 User Manual

 

40 

DB2 Manager User Guide 

 StorageTek 

Proprietary 

scheduler subtask introduces some processing overhead, so 
care should be taken to avoid over-allocation of this setting. 

 

  This setting may be varied during DB2 Manager operation via 

the 'SET MAXSCHED’ operator command. 

 

  If this parameter is omitted, a default value of MAXSCHED=4 

will be used. 

 
MAXQLEN = nnn 
 

Requirement: Optional 

 Default: 

4 

  Validation:  nnn = 1-3 digit numeric value in range 1 - 256 

 

Use:  The MAXQLEN parameter specifies the maximum number of 

retrieval requests which may be simultaneously queued for 
any single tape-reader subtask in the control region. 

 

Notes:  DB2 Manager will queue requests for retrieval from an Archive 

Manager tape volume which is already being processed, on a 
'first-in first-out' basis, up to the maximum level specified in 
this parameter. 

 

  If TAPEWAIT=0 is specified, requests which cause this 

maximum to be exceeded will receive a “resource busy” 
condition from DB2 Manager - an SQL error code of –652 will 
be returned to the calling application and field SQLERRD(6) in 
the SQLCA will contain the hexadecimal value x’0A’. 

 

 

  Non-zero values of TAPEWAIT will cause requests which 

encounter this condition to be held internally for processing 
until a tape drive becomes available, or until the time limit 
specified in the TAPEWAIT parameter is exceeded, at which 
point a “resource busy” condition will be returned to the calling 
application, as above. 

 

  This setting may be varied during DB2 Manager operation via 

the 'SET MAXQLEN' operator command. 

 

  If this parameter is omitted, a default value of MAXQLEN=4 

will be used. 

 
RETAINTAPE = nnnn