Data set statistics record layout

The following table shows the record layout for data set statistics.

Offset (Dec)	Format	Length	Description	SAS format
SMF header
1	Binary	1	System indicator	PIB1.
2	Binary	1	Record number	PIB1.
3		8	SMF timestamp	SMFSTAMP8.
11	Char	4	SID	$4.
XBM header
15	Binary	1	Record Type	PIB1.
16	Char	4	XBM SSID	$4.
20	Char	8	Version text	$8.
28	Binary	1	Number of sections	PIB1.
Data set statistics section
00	Binary	4	Length of Section	PIB4.
04	Binary	4	Object ID (Data Sets = 113)	PIB4.
08	NA	4	Reserved	NA
12	NA	4	Reserved	NA
16	NA	2	Reserved	NA
18	NA	2	Reserved	NA
20	NA	8	Create timestamp	NA
28	NA	8	Statistics timestamp	NA
36	NA	8	Interval time in seconds	RB8.
44	NA	NA	Reserved	NA
48	Binary	1	Compress switch	PIB1.
49	Binary	1	Active switch	PIB1.
50	Binary	1	Cache type	PIB1.
51	Char	45	Data set name	$44
96	Binary	4	Priority	PIB4.
100	Char	33	Activating management set	$32.
133	NA	7	Reserved	NA
140	Binary	8	Cache used bytes	PIB8.
148	Binary	8	Cache original bytes	PIB8.
156	Binary	8	Cache compressed bytes	PIB8.
164	Binary	8	Blocks written to DASD	PIB8.
172	Binary	8	Snapshot of WRITES	PIB8.
180	Binary	8	Snapshot of WRITES1	PIB8.
188	Binary	8	Blocks written to cache	PIB8.
196	Binary	8	Snapshot of CWRITES	PIB8.
204	Binary	8	Snapshot of CWRITES1	PIB8.
212	Binary	8	Cache write failures	PIB8.
220	Binary	8	Block read while inactive (from DASD)	PIB8.
228	Binary	8	Snapshot of READS	PIB8.
236	Binary	8	Snapshot of READS1	PIB8.
244	Binary	8	Blocks read while active (from cache and DASD)	PIB8.
252	Binary	8	Snapshot of AREADS	PIB8.
260	Binary	8	Snapshot of AREADS1	PIB8.
268	Binary	8	Blocks satisfied from cache	PIB8.
276	Binary	8	Snapshot of HITS	PIB8.
284	Binary	8	Snapshot of HITS1	PIB8.
292	Binary	8	Cache read failures	PIB8.
300	Binary	8	Bytes output to disk	PIB8.
308	Binary	8	Output time in microseconds	PIB8.
316	Binary	8	Bytes written to cache	PIB8.
324	Binary	8	Write time in microseconds	PIB8.
332	Binary	8	Bytes read from cache	PIB8.
340	Binary	8	Read time in microseconds	PIB8.
348	Binary	8	Bytes input from DASD	PIB8.
356	Binary	8	Input time in microseconds	PIB8.
364	Binary	8	Cache high water mark	PIB8.
372	Binary	8	Accumulated cache writes before resetting statistics (0 if statistics are not reset)	PIB8.
380	Binary	8	Accumulated bytes written to cache before resetting statistics	PIB8.
388	Char	1	Dynamic cache flag ‘y’	$1.
389	Char	1	Statistics reset ‘y’	$1.
390	Char	1	Dynamic deactivate ‘y’	$1.
391	Char	1	Inefficient blocksize ‘y’	$1.
392	Binary	4	Listable flag	PIB4.
396	Binary	4	Self address	PIB4.
400	Char	1	Global IO enabled ‘y’	$1.
401		3	Reserved
404	Binary	8	Cache byte limit	PIB8.
Snapshot data set statistics section
00	Binary	4	Length of Section	PIB4.
04	Binary	4	Object ID (Data Sets = 113)	PIB4.
08	NA	4	Reserved	NA
12	NA	4	Reserved	NA
16	NA	2	Reserved	NA
18	NA	2	Reserved	NA
20	NA	8	Create timestamp	NA
28	NA	8	Statistics timestamp	NA
36	NA	8	Interval time in seconds	RB8.0
44	Binary	4	Cache byte limit	PIB4.
48	Binary	1	Compress switch	PIB1.
49	Binary	1	Active switch	PIB1.
50	Binary	1	Cache type	PIB1.
51	Char	45	Data set name	$44
96	Binary	4	Priority	PIB4.
100	Char	33	Activating management set	$32.
133	NA	7	Reserved	NA
140	Binary	8	Cache used bytes	PIB8.
148	Binary	8	Cache original bytes	PIB8.
156	Binary	8	Cache compressed bytes	PIB8.
164	Binary	8	Blocks written to DASD	PIB8.
172	Binary	8	Snapshot of WRITES	PIB8.
180	Binary	8	Snapshot of WRITES1	PIB8.
188	Binary	8	Blocks written to cache	PIB8.
196	Binary	8	Snapshot of CWRITES	PIB8.
204	Binary	8	Snapshot of CWRITES1	PIB8.
212	Binary	8	Cache write failures	PIB8.
220	Binary	8	Block read while inactive	PIB8.
228	Binary	8	Snapshot of READS	PIB8.
236	Binary	8	Snapshot of READS1	PIB8.
244	Binary	8	Blocks read while active	PIB8.
252	Binary	8	Snapshot of AREADS	PIB8.
260	Binary	8	Snapshot of AREADS1	PIB8.
268	Binary	8	Blocks satisfied from cache	PIB8.
276	Binary	8	Snapshot of HITS	PIB8.
284	Binary	8	Snapshot of HITS1	PIB8.
292	Binary	8	Cache read failures	PIB8.
300	Binary	8	Bytes output to disk	PIB8.
308	Binary	8	Output time in microseconds	PIB8.
316	Binary	8	Bytes written to cache	PIB8.
324	Binary	8	Write time in microseconds	PIB8.
332	Binary	8	Bytes read from cache	PIB8.
340	Binary	8	Read time in microseconds	PIB8.
348	Binary	8	Bytes input from DASD	PIB8.
356	Binary	8	Input time in microseconds	PIB8.
364	Binary	8	Cache high water mark	PIB8.
372	Binary	8	Accumulated cache writes before resetting statistics (0 if statistics are not reset)	PIB8.
380	Binary	8	Accumulated bytes written to cache before resetting statistics	PIB8.
388	Char	1	Dynamic cache flag ‘y’	$1.
389	Char	1	Statistics reset ‘y’	$1.
390	Char	1	Dynamic deactivate ‘y’	$1.
391	Char	1	Inefficient blocksize ‘y’	$1.
392	Binary	8	Cacheable flag	PIB8.
400	Char	1	Global IO enabled ‘y’	$1.
401	Char	31	Reserved
Db2 statistics section
00	Binary	4	Length of Section	PIB4.
04	Binary	4	Object ID (Db2 DSN = 154)	PIB4.
08	Binary	4	Reserved	NA
12	Binary	4	Reserved	NA
16	Binary	2	Db2 DBID	PIB2.
18	Binary	2	Db2 PSID	PIB2.
20	Char	8	Database name	$8.
28	Char	8	Table space name	$8.
36	Char	4	Partition	$4.
40	Char	5	Db2 SSID	$4.
45	Char	1	Compression type key	$1.
46	NA	6	Reserved	PIB8.
52	Binary	8	Sync reads SIOs	PIB8.
60	Binary	8	Snapshot of SREADS	PIB8.
68	Binary	8	Snapshot of SREADS1	PIB8.
76	Binary	8	Sync writes SIOs	PIB8.
84	Binary	8	Snapshot of SWRITES	PIB8.
92	Binary	8	Snapshot of SWRITES1	PIB8.
100	Binary	8	Sync reads total time	PIB8.
108	Binary	8	Snapshot of SRTIME	PIB8.
116	Binary	8	Snapshot of SRTIME1	PIB8.
124	Binary	8	Sync writes total time	PIB8.
132	Binary	8	Snapshot of SWTIME	PIB8.
140	Binary	8	Snapshot of SWTIME1	PIB8.
148	Binary	8	Async reads SIOs	PIB8.
156	Binary	8	Snapshot of AREADS	PIB8.
164	Binary	8	Snapshot of AREADS1	PIB8.
172	Binary	8	Async writes SIOs	PIB8.
180	Binary	8	Snapshot of AWRITES	PIB8.
188	Binary	8	Snapshot of AWRITES1	PIB8.
196	Binary	8	Async reads total time	PIB8.
204	Binary	8	Snapshot of ARTIME	PIB8.
212	Binary	8	Snapshot of ARTIME1	PIB8.
220	Binary	8	Async writes total time	PIB8.
228	Binary	8	Snapshot of AWTIME	PIB8.
236	Binary	8	Snapshot of AWTIME1	PIB8.
244	Binary	8	Async reads total pages	PIB8.
252	Binary	8	Snapshot of ARPAGES	PIB8.
260	Binary	8	Snapshot of ARPAGES2	PIB8.
268	Binary	8	Async write total pages	PIB8.
276	Binary	8	Snapshot of AWPAGES	PIB8.
284	Binary	8	Snapshot of AWPAGES2	PIB8.
292	Binary	4	Page size	PIB4.
296	Char	1	Statistics reset ‘y’	$1.
297	Char	43	Reserved
Snapshot utilities statistics section
00	Binary	4	Length of Section	PIB4.
04	Binary	4	Object ID (snapshot = 158)	PIB4.
08	Binary	4	Reserved	NA
12	Binary	4	Reserved	NA
16	Binary	4	Function	PIB4.
20	Binary	4	Return code	PIB4.
24	Binary	4	Reason code	PIB4.
28	Binary	4	ASID	PIB4.
32	Binary	4	TCB	PIB4.
36	Char	9	Component name	$8.
45	Char	45	Data set name	$44.
90	Char	5	XBM SSID	$4.
95	Char	9	User jobname	$8.
104	Char	9	User stepname	$8.
113	Char	9	User ID	$8.
122	Char	1	Compression	$1.
123	Binary	4	Priority	PIB4.
127	Binary	4	Allocated	PIB4.
131	Binary	4	Used bytes	PIB4.
135	Binary	4	Limit size	PIB4.
139	Binary	8	Percent used	PIB8.
147	Binary	8	Blocks	PIB8.
155	Binary	8	Active reads	PIB8.
163	Binary	8	Read hits	PIB8.
171	Binary	8	Read hit ratio	PIB8.
179	Binary	8	Writes	PIB8.
187	Binary	8	Cache writes	PIB8.
195	Binary	8	Maximum cache bytes	PIB8.
203	Char	5	Db2 SSID	$4.
208	Binary	4	RBA maintained by XBM	PIB4.
212	Binary	4	RBA maintained by user	PIB4.
VSAM statistics section
00	Binary	4	Length of section	PIB4.
04	Binary	4	Object ID (VSAM=199)	PIB4.
08	Binary	4	Reserved	NA
12	Binary	4	Reserved	NA
16	Binary	1	Compression	PIB1.
20	Binary	4	Control interval size	PIB4.
24	Binary	4	Control intervals per control area	PIB4.
28	Binary	4	Share option 1	PIB4.
32	Binary	4	Share option 2	PIB4.
36	Char	96	Reserved	NA
132	Binary	8	Direct reads	PIB8.
140	Binary	8	Snapshot direct reads 1	PIB8.
148	Binary	8	Snapshot direct reads 2	PIB8.
156	Binary	8	Direct writes	PIB8.
164	Binary	8	Snapshot direct writes 1	PIB8.
172	Binary	8	Snapshot direct writes 2	PIB8.
180	Binary	8	Direct reads time	PIB8.
188	Binary	8	Snapshot direct reads 1 time	PIB8.
196	Binary	8	Snapshot direct reads 2 time	PIB8.
204	Binary	8	Direct writes time	PIB8.
212	Binary	8	Snapshot direct writes 1 time	PIB8.
220	Binary	8	Snapshot direct writes 2 time	PIB8.
228	Binary	8	Sequential reads	PIB8.
236	Binary	8	Snapshot sequential reads 1	PIB8.
244	Binary	8	Snapshot sequential reads 2	PIB8.
252	Binary	8	Sequential writes	PIB8.
260	Binary	8	Snapshot sequential writes 1	PIB8.
268	Binary	8	Snapshot sequential writes 2	PIB8.
276	Binary	8	Sequential reads time	PIB8.
284	Binary	8	Snapshot sequential reads 1 time	PIB8.
292	Binary	8	Snapshot sequential reads 2 time	PIB8.
300	Binary	8	Sequential writes time	PIB8.
308	Binary	8	Snapshot sequential writes 1 time	PIB8.
316	Binary	8	Snapshot sequential writes 2 time	PIB8.
324	Binary	8	Sequential reads pages	PIB8.
332	Binary	8	Snapshot sequential read pages 1	PIB8.
340	Binary	8	Snapshot sequential read pages 2	PIB8.
348	Binary	8	Snapshot sequential write pages	PIB8.
356	Binary	8	Snapshot sequential write pages 1	PIB8.
364	Binary	8	Snapshot sequential write pages 2	PIB8.
372	Char	1	Statistics reset flag ‘y’	$1.
373	Char	1	VSAM retain attribute	$1.
374	Char	2	Reserved	NA
376	Binary	1	VSAM attributes	PIB1.
377	Binary	1	VSAM strings	PIB1.
378	Binary	4	IMS dbrc usage indicator	PIB4.
382	Binary	4	Number of buffers	PIB4.
386	Binary	8	VSAM statistics	PIB8.
394	Binary	4	Number of index levels	PIB4.
398	Binary	4	VSAM extents	PIB4.
402	Binary	4	Number of user records	PIB4.
406	Binary	4	Deleted records	PIB4.
410	Binary	4	Inserted records	PIB4.
414	Binary	4	Updated records	PIB4.
418	Binary	4	Number of retrieved records	PIB4.
422	Binary	4	Bytes of freespace	PIB4.
426	Binary	4	VSAM control interval splits	PIB4.
430	Binary	4	VSAM control area splits	PIB4.
434	Binary	4	EXCPs issued	PIB4.
438	Char	48	Reserved	NA
Extended prefetch statistics section
00	Binary	4	Length of section	PIB4.
04	Binary	4	Object ID (PSS=272)	PIB4.
08	Binary	8	Reserved	NA
16	Binary	4	Buffer space allocated	PIB4.
20	Binary	4	Number of buffer acquisitions	PIB4.
24	Binary	4	Number of buffer acquisition attempts	PIB4.
28	Binary	32	Reserved
60	Binary	8	Blocks read by Prefetch	PIB8.
68	Binary	8	Blocks read by application while Prefetch active	PIB8.
76	Binary	8	Blocks satisfied by Prefetch	PIB8.
84	Binary	8	Physical I/O requests by Prefetch	PIB8.
92	Binary	4	Return Code	PIB4.
96	Binary	4	Reason Code	PIB4.
100	Binary	20	Reserved	NA
IMS statistics section
00	Binary	4	Length of Section	PIB4.
04	Binary	4	Object ID (IMS DSN=242)	PIB4.
08	Binary	4	Reserved	NA
12	Binary	4	Reserved	NA
16	Char	1	Statistics reset	$1.
17	Char	1	Data set type	$1.
18	Char	1	Compression type key	$1.
19	Char	1	Reserved	$1.
20	Binary	4	Block size	PIB4.
24	Char	20	Reserved	NA
44	Binary	4	Control interval size	PIB4.
48	Binary	4	Control area size	PIB4.
52	Binary	4	Share option 1	PIB4.
56	Binary	4	Share option 2	PIB4.
60	Binary	8	Direct read SIOs	PIB8.
68	Binary	8	Snapshot of DREAD	PIB8.
76	Binary	8	Snapshot of DREAD1	PIB8.
84	Binary	8	Direct write SIOs	PIB8.
92	Binary	8	Snapshot of DWRITES	PIB8.
100	Binary	8	Snapshot of DWRITES1	PIB8.
108	Binary	8	Direct reads total time	PIB8.
116	Binary	8	Snapshot of DRTIME	PIB8.
124	Binary	8	Snapshot of DRTIME1	PIB8.
132	Binary	8	Direct writes total time	PIB8.
140	Binary	8	Snapshot of DWTIME	PIB8.
148	Binary	8	Snapshot of DWTIME1	PIB8.
156	Binary	8	Sync read SIOs	PIB8.
164	Binary	8	Snapshot of SREAD	PIB8.
172	Binary	8	Snapshot of SREAD1	PIB8.
180	Binary	8	Sync write SIOs	PIB8.
188	Binary	8	Snapshot of SWRITE	PIB8.
196	Binary	8	Snapshot of SWRITE1	PIB8.
204	Binary	8	Sync reads total time	PIB8.
212	Binary	8	Snapshot of SRTIME	PIB8.
220	Binary	8	Snapshot of SRTIME1	PIB8.
228	Binary	8	Sync writes total time	PIB8.
236	Binary	8	Snapshot of SWTIME	PIB8.
244	Binary	8	Snapshot of SWTIME1	PIB8.
252	Binary	8	Sync read total pages	PIB8.
260	Binary	8	Snapshot of SRPAGE	PIB8.
268	Binary	8	Snapshot of SRPAGE1	PIB8.
276	Binary	8	Sync writes total pages	PIB8.
284	Binary	8	Snapshot of SWPAGE	PIB8.
292	Binary	8	Snapshot of SWPAGE1	PIB8.

Data set statistics record layout

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