Data sharing group names
Group names are shared by all members of the data sharing group. Db2 group names include the generic LU name, group attachment name, location name, and coupling facility structure names.
The following names are considered group names:
- Db2 group name
- The name that encompasses the entire data sharing group. The coupling
facility structure names are based on this name.
The Db2 group name must be unique within the Parallel Sysplex®. If you use this name as a basis for the location name, the Db2 group name must be unique within the network.
This name can be up to eight characters long, it must begin with an alphabetic character, and it can consist of the characters A-Z, 0-9, $, #, and @. An example of a Db2 group name is DSNDB0A.
Restrictions: To avoid names that IBM® uses for its XCF groups, do not begin Db2 group names with the letters A-I unless the first three characters are DSN. Do not use the string SYS as the first three characters, and do not use the string UNDESIG as the group name.Important: Never reuse a Db2 group name, even if a data sharing group that previously used the name no longer exists. Some data sharing information, such as the Db2 group name, is retained in the Parallel Sysplex couple data set (CDS). To determine what Db2 group names exist, execute the z/OS® command DISPLAY XCF,GROUP. - ICF catalog alias
- The name of the Integrated Catalog Facility (ICF) catalog alias that you must place in the z/OS master catalog. This name can be up to 8 characters long, and it should be the same as the Db2 group name. An example of an ICF catalog alias name is DSNDB0A.
- Group attachment name
- The name that is used by the TSO/batch attachment, the call attachment
facility (CAF), DL/I batch, utilities, and the Resource Recovery Services attachment facility (RRSAF)
as a
generic
attachment name. This name can be up to four characters long. An example of a group attachment name is DB0A. - Subgroup attachment name
- The name that is used by TSO, CAF, RRSAF, JDBC, ODBC, and Db2 utilities connections requests to identify which subgroup attachment to use. This name can be up to four characters long. An example of a subgroup attachment name is SBG1.
- Catalog and directory database names
- All Db2 subsystems in the group share the same catalog and directory. Examples of the catalog and directory database names are catalias.DSNDB01 and catalias.DSNDB06.
- Application defaults module>
- The name of the module that contains the application programming defaults. This module resides in SDSNEXIT. The name can be up to eight characters long. DSNHDECP is an example module name.
- Target libraries
- Target libraries can be shared among Db2 group members or can be replicated. Example names for target libraries are catalias.SDSNCLST, catalias.SDSNLINK, catalias.SDSNLOAD, and catalias.SDSNEXIT.
- Network Address
- The group DVIPA and port number. It can be an IPv4 address, an IPv6 address, or both.
- DRDA port number
- The port number that is used by the distributed data facility (DDF) to accept incoming SQL connection requests, if the data sharing group uses TCP/IP. 446 is the recommended DRDA port.
- Secure DRDA port number
- The secure port identifies the TCP/IP port number that is used by DDF to accept inbound secure DRDA connection requests.
- Location name
- The name that is used when the data sharing group processes distributed requests. The group is treated as a single location by remote requesters. Requesters use this name in their SQL applications. This name can be up to 16 characters long.
- Generic LU name
- This name lets remote requesters configure their systems to treat the data sharing group as a single LU. This name can be up to eight characters long.
- Parallel Sysplex domain name
- This name lets you take advantage of workload balancing for TCP/IP connections.
- Group IPv4 address
- GRPIPV4 identifies a constant IPv4 address to be associated with the data sharing group for which this DDF is a member.
- Group IPv6 address
- GRPIPV6 identifies a constant IPv6 address to be associated with the data sharing group for which this DDF is a member.