The data sets produced when the EXTRACT keyword is specified contain information about persistent messages. Messages are identified by their queue name and an eight character key. Once a message has been got, the key can be reused by another message, so it is important to ensure that time sequence is maintained. In the records are times. A time stamp can only be extracted from a Begin-UR record or from an MQPUT request. Thus if there is only a long running transaction which is getting messages, the times when the gets occurred will all be the time the transaction started (the Begin-UR record). If there are many short units of work, or many messages being put, the time is reasonably accurate (within milliseconds), otherwise the times will become less and less accurate.
The information in the data sets has the following layout: (Note there is a 4 byte Record Descriptor Word at the front of each record because the files are Variable Blocked format). The field names correspond to those in the C header file CSQ4LOGD in thlqual.SCSQC370.
Offset | Type | Length | Name | Description | |
Dec | Hex | ||||
0 | 0 | Character | 21 | csrecorddate | The approximate time the log was written, in the format yyyy.ddd hh:mm:ss.thm |
21 | 15 | Character | 7 | cstimedelta | Approximate time difference in milliseconds from the start of the unit of work. Right-justified and padded with blanks. |
28 | 1C | 64-bit integer | 8 | dtodout | Estimated time that the log record was created, in STCK format. |
36 | 24 | Character | 6 | csurid | Queue manager specific unique identifier of the unit of work that created the log record. |
42 | 2A | Character | 12 | cscorrelator | Thread correlation identifier |
54 | 36 | Character | 8 | csauth | Authorization identifier (Userid associated with unit of work) |
62 | 3E | 64-bit integer | 8 | dtime | Time that the unit of work was started, in STCK format |
70 | 46 | Character | 8 | csresource | Resource name |
78 | 4E | Character | 8 | cscnty | Connection type: one of BATCH, RRSBATCH, IMS(TM), CICS(R), CHIN or nulls for an internal task |
86 | 56 | Character | 8 | cscnid | Connection ID of thread that created this unit of work |
94 | 5E | Character | 3 | csstatus | Unit of work type: BUR for begin or CP for checkpoint information |
97 | 61 | Integer | 4 | ldatalen | Length of the message data (if any) |
101 | 65 | Character | 4 | csqmgrname | Name of queue manager |
105 | 69 | Character | 48 | csqueuename | Name of queue, for get, put, or expired messages |
153 | 99 | Character | 12 | cssqdmcp | Shared queue message key. Blank if not a shared queue |
165 | A5 | Character | 8 | csdmcp | Non-shared queue message key. Blank if a shared queue. |
173 | AD | Character | 8 | csverb | Activity :
|
181 | B5 | Character | 1 | cscmitstatus | Status of unit of work:
|
182 | B6 | Character | 1 | csshunt | Shunted indicator
|
183 | B7 | Character | 6 | cslogrba | RBA of log record |
189 | BD | Character | 6 | csshuntrba | RBA of shunted log record |
195 | C3 | Integer | 4 | lsegment | The segment number of the data, starting from 1. |
199 | C7 | Variable | data part | ||
199 | C7 | Character | 1 | csbora | If csverb is ALTER, indicates whether the data is the
'before' or 'after' copy of the object.
|
200 | C8 | Character | Variable | csvardata | Message or object data. Length as given in ldatalen. |
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