Administration Guide

Database Manager Configuration Parameter Summary

The following table lists the parameters in the database manager configuration file for database servers. When changing the database manager configuration parameters, consider the detailed information for each parameter. Specific operating environment information including defaults is part of each parameter description.

The column "Performance Impact" in the following table provides an indication of the relative importance of each parameter as it relates to system performance. It is impossible for this column to apply accurately to all environments; you should view this information as a generalization.

• High -- indicates the parameter can have a significant impact on performance. You should consciously decide the values of these parameters; which, in some cases, will mean that you accept the default provided.
• Medium -- indicates the parameter can have some impact on performance. Your specific environment and needs will determine how much tuning effort should be focused on these parameters.
• Low -- indicates that the parameter has a less general or less significant impact on performance.
• None -- indicates that the parameter does not directly impact performance. While you do not have to tune these parameters for performance, they can be very important for other aspects of your system configuration, such as enabling communication support.

Table 52. Configurable Database Manager Configuration Parameters

Parameter	Performance Impact	Additional Information
agentpri	High	Priority of Agents (agentpri)
agent_stack_sz	Low	Agent Stack Size (agent_stack_sz)
aslheapsz	High	Application Support Layer Heap Size (aslheapsz)
audit_buf_sz	High	Audit Buffer Size (audit_buf_sz)
authentication	Low	Authentication Type (authentication)
backbufsz	Medium	Default Backup Buffer Size (backbufsz)
catalog_noauth	None	Cataloging Allowed without Authority (catalog_noauth)
comm_bandwidth	Medium	Communications Bandwidth (comm_bandwidth)
conn_elapse	Medium	Connection Elapse Time (conn_elapse)
cpuspeed	Low (see note)	CPU Speed (cpuspeed)
datalinks	Low	Enable Data Links Support (datalinks)
dft_account_str	None	Default Charge-Back Account (dft_account_str)
dft_client_adpt	None	Default Client Adapter Number (dft_client_adpt)
dft_client_comm	None	Default Client Communication Protocol (dft_client_comm)
dft_monswitches dft_mon_bufpool dft_mon_lock dft_mon_sort dft_mon_stmt dft_mon_table dft_mon_uow	Medium	Default Database System Monitor Switches (dft_monswitches)
dftdbpath	None	Default Database Path (dftdbpath)
diaglevel	Low	Diagnostic Error Capture Level (diaglevel)
diagpath	None	Diagnostic Data Directory Path (diagpath)
dir_cache	Medium	Directory Cache Support (dir_cache)
dir_obj_name	None	Object Name in DCE Namespace (dir_obj_name)
dir_path_name	None	Directory Path Name in DCE Namespace (dir_path_name)
dir_type	None	Directory Services Type (dir_type)
discover	Medium	Discovery Mode (discover)
discover_comm	Low	Search Discovery Communications Protocols (discover_comm)
discover_inst	Low	Discover Server Instance (discover_inst)
dos_rqrioblk	High	DOS Requester I/O Block Size (dos_rqrioblk)
drda_heap_sz	Low	DRDA Heap Size (drda_heap_sz)
fcm_num_anchors	High	Number of FCM Message Anchors (fcm_num_anchors)
fcm_num_buffers	High	Number of FCM Buffers (fcm_num_buffers)
fcm_num_connect	High	Number of FCM Connection Entries (fcm_num_connect)
fcm_num_rqb	High	Number of FCM Request Blocks (fcm_num_rqb)
federated	Medium	Federated Database System Support (federated)
fileserver	None	IPX/SPX File Server Name (fileserver)
indexrec	Medium	Index Re-creation Time (indexrec)
initdari_jvm	Medium	Initialize DARI Process with JVM (initdari_jvm)
intra_parallel	High	Enable Intra-Partition Parallelism (intra_parallel)
ipx_socket	None	IPX/SPX Socket Number (ipx_socket)
java_heap_sz	High	Maximum Java Interpreter Heap Size (java_heap_sz)
jdk11_path	None	Java Development Kit 1.1 Installation Path (jdk11_path)
keepdari	Medium	Keep DARI Process Indicator (keepdari)
maxagents	Medium	Maximum Number of Agents (maxagents)
maxcagents	Medium	Maximum Number of Concurrent Agents (maxcagents)
max_connretries	Medium	Node Connection Retries (max_connretries)
max_coordagents	Medium	Maximum Number of Coordinating Agents (max_coordagents)
maxdari	Medium	Maximum Number of DARI Processes (maxdari)
max_logicagents	Medium	Maximum Number of Logical Agents (max_logicagents)
max_querydegree	High	Maximum Query Degree of Parallelism (max_querydegree)
max_time_diff	Medium	Maximum Time Difference Among Nodes (max_time_diff)
maxtotfilop	Medium	Maximum Total Files Open per Application (maxtotfilop)
min_priv_mem	Medium	Minimum Committed Private Memory (min_priv_mem)
mon_heap_sz	Low	Database System Monitor Heap Size (mon_heap_sz)
nname	None	NetBIOS Workstation Name (nname)
notifylevel	Low	Notify Level (notifylevel)
numdb	Low	Maximum Number of Concurrently Active Databases (numdb)
num_initagents	Medium	Initial Number of Agents in Pool (num_initagents)
num_initdaris	Medium	Initial Number of Fenced DARI Processes in Pool (num_initdaris)
num_poolagents	High	Agent Pool Size (num_poolagents)
objectname	None	IPX/SPX DB2 Server Object Name (objectname)
priv_mem_thresh	Medium	Private Memory Threshold (priv_mem_thresh)
query_heap_sz	Medium	Query Heap Size (query_heap_sz)
restbufsz	Medium	Default Restore Buffer Size (restbufsz)
resync_interval	None	Transaction Resync Interval (resync_interval)
route_obj_name	None	Routing Information Object Name (route_obj_name)
rqrioblk	High	Client I/O Block Size (rqrioblk)
sheapthres	High	Sort Heap Threshold (sheapthres)
spm_log_file_sz	Low	Sync Point Manager Log File Size (spm_log_file_sz)
spm_log_path	Medium	Sync Point Manager Log File Path (spm_log_path)
spm_max_resync	Low	Sync Point Manager Resync Agent Limit (spm_max_resync)
spm_name	None	Sync Point Manager Name (spm_name)
ss_logon	None	LOGON Required for DB2START/DB2STOP (ss_logon)
start_stop_time	Low	Start and Stop Timeout (start_stop_time)
svcename	None	TCP/IP Service Name (svcename)
sysadm_group	None	System Administration Authority Group Name (sysadm_group)
sysctrl_group	None	System Control Authority Group Name (sysctrl_group)
sysmaint_group	None	System Maintenance Authority Group Name (sysmaint_group)
tm_database	None	Transaction Manager Database Name (tm_database)
tp_mon_name	None	Transaction Processor Monitor Name (tp_mon_name)
tpname	None	APPC Transaction Program Name (tpname)
trust_allclnts	None	Trust All Clients (trust_allclnts)
trust_clntauth	None	Trusted Clients Authentication (trust_clntauth)
udf_mem_sz	Low	UDF Shared Memory Set Size (udf_mem_sz)
Note: The cpuspeed parameter can have a significant impact on performance but you should use the default value, except in very specific circumstances, as documented in the parameter description.

Table 53. Informational Database Manager Configuration Parameters

Parameter	Additional Information
nodetype	Machine Node Type (nodetype)
release	Configuration File Release Level (release)