300 IBM Content Manager OnDemand Guide
Several of the parameters that affect storage management are ARS_NUM_OAMSRVR, 
ARS_NUM_OAMSRVR_SLOW_RETRIEVE, and ARS_OAM_SLOW_RETRIEVE_THRESHOLD. 
ARS_NUM_OAMSRVR
This parameter specifies the maximum number of concurrently attached threads between the 
Content Manager OnDemand object server and OAM for z/OS. Typically, this value is set to a 
number between 4 - 30, depending on client access patterns and object storage locations 
(disk versus tape). This parameter has a maximum value of 30. Any value larger than 30 
result in a U0039 abend.
ARS_NUM_OAMSRVR_SLOW_RETRIEVE
This parameter determines the number of task control blocks (TCBs) that the Content 
Manager OnDemand server starts to handle connections to OAM for retrievals from objects 
with a slow retrieval time as defined by the ARS_OAM_SLOW_RETRIEVE_THRESHOLD parameter. 
The ARS_NUM_OAMSRVR_SLOW_RETRIEVE parameter applies to all object servers. If the value that 
is specified for this parameter is zero (0), no TCBs are dedicated for slow retrievals. All 
retrievals are processed by the TCBs that are associated with the ARS_NUM_OAMSRVR 
parameter. The default is zero (0). The ARS_NUM_OAMSRVR_SLOW_RETRIEVE TCBs are in addition 
to the ARS_NUM_OAMSRVR TCBs, and they use additional DB2 connections.
ARS_OAM_SLOW_RETRIEVE_THRESHOLD
This parameter specifies the threshold at which OAM retrievals are processed by the TCBs 
that are associated with the ARS_NUM_OAMSRVR_SLOW_RETRIEVE parameter. If the estimated 
retrieval time for an object (as indicated by QELQERRT) is greater than or equal to the value 
of the ARS_OAM_SLOW_RETRIEVE_THRESHOLD parameter, the OSREQ RETRIEVE is processed 
by an ARS_NUM_OAMSRVR_SLOW_RETRIEVE TCB. The default value is 12000. For other valid 
QELQERRT values, see the Object Access Method Application Programmer’s Reference, 
SC35-0425-08. An ARS_OAM_SLOW_RETRIEVE_THRESHOLD value of zero (0) with a nonzero 
ARS_NUM_OAMSRVR_SLOW_RETRIEVE value causes all OAM retrieve requests to be processed by 
the ARS_NUM_OAMSRVR_SLOW_RETRIEVE TCBs, while the ARS_NUM_OAMSRVR TCBs process store, 
query, and delete requests.
13.2  Data loading performance
The data loading process is illustrated in Figure 13-1 on page 301. The process begins with 
the Content Manager OnDemand Administrator Client defining the application group and 
application parameters for the reports to be loaded. These parameters are stored in the 
Content Manager OnDemand system tables on the library server.