Configuration Parameters - IMPORTALTINDEXES and FASTPATHMATCH

CONNX for VSAM provides two configuration parameters to expedite or disable the VSAM alternate index file import search process. The default settings for these parameters are optimal for the CONNX VSAM sample files and for the SCT VSAM master files. If your installation does not implement VSAM alternate index files, you can change these parameters to improve the CONNX VSAM file import response time.

The IMPORTALTINDEXES configuration parameter directs CONNX to execute or bypass the alternate index search logic for each imported VSAM file. When IMPORTALTINDEXES is enabled, CONNX searches the CICS RDO file for alternate index entries which point to each imported CICS file name. The default setting for IMPORTALTINDEXES increases CONNX VSAM file import response time in proportion to the number of RDO file entries.

When enabled, the FASTPATHMATCH configuration parameter restricts the CONNX alternate index file name search logic to a two-character prefix based on the imported CICS file name. For example, all CONNX VSAM sample files are defined to the CICS RDO file with a three-character CNX prefix. The CONNX sample VSAM KSDS equipment file is named CNXEQK. The CICS file names for the two alternate indexes for this file are CNXEQI1 and CNXEQI2.

The default FASTPATHMATCH setting directs the CONNX VSAM alternate index search logic to start with CICS file names beginning with CN and to stop as soon as a different two-character CICS file name prefix is found.

IMPORTALTINDEXES	FASTPATHMATCH	REMARKS
Disabled	Disabled	Disables alternate index import logic. This setting is the fastest.
Disabled	Enabled	Same as above.
Enabled	Disabled	Enables alternate index import complete search logic. This setting is the slowest but also the most accurate.
Enabled	Enabled	Default setting: restricts alternate index import logic to CICS short file names with the same two-character prefix as the base CICS short file name. This setting is fast, but potentially incomplete. Optimal for CONNX sample and SCT master VSAM files.