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Hierarchic picture for IMS Database Segment I/O probabilities Report

IP.com Disclosure Number: IPCOM000015402D
Original Publication Date: 2002-Jul-01
Included in the Prior Art Database: 2003-Jun-20
Document File: 3 page(s) / 45K

Publishing Venue

IBM

Abstract

The invention's method newly provides "SEGMENT I/O PROBABILITY REPORT" in IMS High Performance Pointer Checker for OS/390(HPPC). The report shows the probability of doing I/O (PROB. OF IO) when traversing from any segment type to another segment type. The distinctive feature of the report is showing the probabilities in a hierarchical format. The hierarchical format emphasizes which points have high possibilities that occur I/O.

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Hierarchic picture for IMS Database Segment I/O probabilities Report

    The invention's method newly provides "SEGMENT I/O PROBABILITY REPORT" in IMS High Performance Pointer Checker for OS/390(HPPC). The report shows the probability of doing I/O (PROB. OF IO) when traversing from any segment type to another segment type. The distinctive feature of the report is showing the probabilities in a hierarchical format. The hierarchical format emphasizes which points have high possibilities that occur I/O.

as appropriate)? HPPC monitors the performance and consistency of IMS hierarchical data base. HPPC has shown PROB. OF IO in a Segment & Pointer Statistics Report (shown in Figure 1). The PROB. OF IO is on rightmost field in Figure 1.

IMS HIGH PERFORMANCE POINTER CHECKER "SEGMENT & POINTER STATISTICS REPORT" PAGE: 1
5655-E09 DATE: 08/30/2000 TIME: 14.55.07 FABPMAIN - V1.R1

DBNAME:D01021 DB#:001 PARTNAME:D01021A PART ID:00001 REORG#:00001 DSG#:A DDNAME:D01021AA
DSNAME:TESTDS.HPSV1R0.THPC0001.D01021.A00001 DBORG: PHDAM

<----- SOURCE ----> <---- TARGET ----> <------- COUNT OF POINTERS ----------------> PROB.
DB DG SC SEGNAME PTR DB DG SC SEGNAME BLOCK-1 SAME BLK BLOCK+1 EYOND TOTAL EXTERNAL OF IO

RAP 001 A 01 ROOT 0 3 0 0 3 0 .00

001 A 01 ROOT PTF 001 A 01 ROOT 0 0 0 0 0 0 .00

PCF 001 B 02 DEP1 0 0 0 0 0 3 1.00

IMS HIGH PERFORMANCE POINTER CHECKER SEGMENT & POINTER STATISTICS REPORT" PAGE: 2
5655-E09 DATE: 08/30/2000 TIME: 14.55.07 FABPMAIN - V1.R1

DBNAME:D01021 DB#:001 PARTNAME:D01021A PART ID:00001 REORG#:00001 DSG#:A DDNAME:D01021AA
DSNAME:TESTDS.HPSV1R0.THPC0001.D01021.A00001 DBORG: PHDAM

<--- POINTER TYPE ---> <----------------- COUNT OF POINTERS ------------------------->

PTR BLOCK-1 SAME BLK BLOCK+1 BEYOND TOTAL EXTERNAL

PTF 0 0 0 0 0 N / A
PTB 0 0 0 0 0 N / A
PP 0 0 0 0 0 0
LTF 0 0 0 0 0 N / A
LTB 0 0 0 0 0 N / A
LP 0 0 0 0 0 0
PH 0 0 0 0 0 N / A
LCF 0 0 0 0 0 0
LCL 0 0 0 0 0 0
PCF 0 0 0 0 0 3
PCL 0 0 0 0 0 0

              ------- ------- ------- ------- ------- -------
TOTALS 0 0 0 0 0 3

NOTE 1 : THIS REPORT SHOWS THE LOCALITY OF REFERENCE BETWEEN ANY

TWO SEGMENTS ONLY.
(I.E. SOURCE-OF-PTR TO TARGET-OF-PTR).

1

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ONE SHOULD NOT INFER FROM THE 'SAME BLK' COUNT THAT
DEPENDENT SEGMENTS ARE NECESSARILY IN THE SAME BLOCK
WITH THEIR ROOT.

SEE THE 'DB RECORD DISTRIBUTION STATISTICS' REPORT FOR
SPECIFIC INFORMATION ON THE OCCURRENCE OF DEPENDENT
SEGMENTS IN THE SAME BLOCK WITH THEIR ROOT.

2 : THE *LP AND *LC ENTRIES (IF ANY) COMPLETE THE DISPLAY OF

ALL LOGICAL RELATIONSHIPS

. *LP SHOWS THAT THE SOURCE (LCHILD) HAS A SYMB LP PTR
TO ITS TARGET (LPARENT)

. *LC SHOWS THAT THE SOURCE (LPARENT) DOES NOT POINT
TO ITS TARGET (LCHILD)

SINCE DIRECT PTRS FOR *LP AND *LC DO NOT EXIST IN THE
PREFIX OF THE SOURCE SEGMENT; COUNT=N/A

3 : THE ** ANY SEGM ENTRIES DISPLAY HIERARCHICAL RELATIONS

(I.E. SEGMENT PTR = H/HB OR PARENT PTR = H/HB AND
IMMEDIATE CH...