Online analysis

• The DEDB is online to IMS when analysis occurs.

• Read-with-integrity access (shared locks) is used. IMS services are used to read the DEDB.

• Other applications can update the DEDB while analysis is in progress.

Fast Path Online Analyzer/EP locks each UOW briefly while it is read and analyzed. Another application momentarily cannot read that one UOW; however, other applications can access the remainder of the database during that time. A UOW that is being processed by an application is locked by the IMS system, preventing Fast Path Online Analyzer/EP from accessing the UOW until it is unlocked by the application.

Control region requirement (ACCES=UP)

When performing an online analysis, you must define the database to the IMS Control Region with ACCESS=UP.

Inputs and outputs

The following figure shows the inputs and outputs for the online analysis function:

Control statement sample

Analysis is limited only to the area that is specified with the IAREA keyword.

Example of JCL for an online analysis

//PFP EXEC PGM=DFSRRC00,REGION=0M,      PARM=(IFP,<dbdname>,DBF#FPU0) 
//STEPLIB  DD   DSN=BMC.PFP.LOAD,DISP=SHR
//         DD   DSN=IMS.RESLIB,DISP=SHR
//PFPSYSIN DD   * 
  ANALYZE DBD=<dbdname>,IAREA=<areaname>
/*

MADS support

Multiple area data sets (MADS) are fully supported by the online analysis process.