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Oceniono. / 5. Na podstawie oceny klientów
During an emergency restart of CICS, CICS restores those sessions pending
recovery from the CICS global catalog and the CICS system log to an in-session
state. This process of persistent sessions recovery takes place when CICS opens its
VTAM ACB. With multinode persistent sessions support, if VTAM or z/OS fails,
sessions are restored when CICS reopens its VTAM ACB, either automatically by
the COVR transaction, or by a CEMT or EXEC CICS SET VTAM OPEN command.
Although sessions are recovered, any transactions inflight at the time of the failure
are abended and not recovered.
When a terminal user enters data during persistent sessions recovery, CICS appears
to hang. The screen that was displayed at the time of the failure remains on
display until persistent sessions recovery is complete. You can use options on the
TYPETERM and SESSIONS resource definitions for the CICS region to customize
CICS so that either a successful recovery can be transparent to terminal users, or
terminal users can be notified of the recovery, allowing them to take the
appropriate actions.
If APPC sessions are active at the time of the CICS, VTAM or z/OS failure,
persistent sessions recovery appears to APPC partners as CICS hanging. VTAM
saves requests issued by the APPC partner, and passes them to CICS when
recovery is complete. When CICS reestablishes a connection with VTAM, recovery
of terminal sessions is determined by the settings for the PSRECOVERY option of
the CONNECTION resource definition and the RECOVOPTION option of the
SESSIONS resource definition. You must set the PSRECOVERY option of the
CONNECTION resource definition to the default value SYSDEFAULT for sessions
to be recovered. The alternative, NONE, means that no sessions are recovered. If
you have selected the appropriate recovery options and the APPC sessions are in
the correct state, CICS performs an ISSUE ABEND to inform the partner that the
current conversation has been abnormally ended.
If CICS has persistent verification defined, the sign-on is not active under
persistent sessions until the first input is received by CICS from the terminal.
The CICS Resource Definition Guide describes the steps required to define persistent
sessions support for a CICS region.
Situations in which sessions are not reestablished
When VTAM persistent sessions support is in use for a CICS region, CICS does not
always reestablish sessions that are being held by VTAM in a recovery pending
state. In the situations listed here, CICS or VTAM unbinds and does not rebind
recovery pending sessions.
v If CICS does not restart within the persistent sessions delay interval, as specified
by the PSDINT system initialization parameter.
v If you perform a COLD start after a CICS failure.
v If CICS restarts with XRF=YES, when the failed CICS was running with
XRF=NO.
v If CICS cannot find a terminal control table terminal entry (TCTTE) for a session;
for example, because the terminal was autoinstalled with AIRDELAY=0
specified.
v If a terminal or session is defined with the recovery option (RECOVOPTION) of
the TYPETERM or SESSIONS resource definition set to RELEASESESS,
UNCONDREL or NONE.
v If a connection is defined with the persistent sessions recovery option
(PSRECOVERY) of the CONNECTION resource definition set to NONE.
Chapter 3. Shutdown and restart recovery 39
- Recovery and Restart Guide 1
- Contents 5
- Contents v 7
- What this book is about 9
- Who should read this book 9
- How to use this book 9
- Release 1 11
- Logging changes 15
- The role of CICS 16
- Recoverable resources 17
- Emergency restart backout 18
- CICS forward recovery 19
- XCF/MRO partner failures 21
- Units of work 25
- Shunted units of work 25
- Synchronization points 27
- CICS recovery manager 29
- Recovery 30
- CICS system log 33
- System activity keypoints 34
- Forward recovery logs 34
- Normal shutdown processing 37
- First quiesce stage 37
- Second quiesce stage 38
- Third quiesce stage 38
- Warm keypoints 39
- Flushing journal buffers 40
- Uncontrolled termination 42
- Cataloging CICS resources 43
- Global catalog 43
- Local catalog 44
- Warm restart 47
- Emergency restart 47
- Cold start 48
- Dynamic RLS restart 49
- Chapter 4. CICS cold start 57
- Temporary storage 59
- Transient data 59
- Monitoring and statistics 61
- Terminal control resources 61
- Dump table 62
- Chapter 4. CICS cold start 51 63
- Chapter 5. CICS warm restart 65
- Data set name blocks 66
- Transactions 68
- LIBRARY resources 68
- Programs 68
- Start requests 69
- Other backout processing 74
- CICS ARM processing 79
- Registering with ARM 80
- De-registering from ARM 80
- Failing to register 81
- ARM couple data sets 81
- Workload policies 82
- Connecting to VTAM 82
- The COVR transaction 83
- Server ARM processing 83
- Unit of work recovery 85
- Transaction backout 86
- Intrapartition transient data 88
- Auxiliary temporary storage 88
- START requests 88
- EXEC CICS CANCEL requests 90
- Backout-failed recovery 91
- Commit-failed recovery 95
- Indoubt failure recovery 96
- Cache failure support 100
- Lost locks recovery 101
- Transaction abend processing 104
- Exit code 104
- Transaction restart 105
- Terminal error processing 109
- Node error program (DFHZNEP) 109
- End user’s standby procedures 115
- Security 116
- Documentation and test plans 117
- About this task 119
- Defining log streams to MVS 120
- Defining system log streams 120
- Recovery considerations 122
- Activity keypointing 124
- Log-tail deletion 126
- Writing user-recovery data 127
- Long-running transactions 128
- Procedure 128
- What to do next 129
- Defining the log of logs 130
- Log of logs failure 131
- Reading log streams offline 131
- Adjusting local time 132
- Recovery for transactions 135
- Recovery for files 137
- VSAM files 137
- Forward recovery 138
- Backward recovery 138
- BDAM files 141
- The CSD data set 141
- Logical recovery 144
- Physical recovery 144
- Recovery for Web services 148
- Persistent message processing 150
- SAA-compatible applications 155
- Program design 155
- Processing dialogs with users 156
- Main storage areas 157
- CICS recoverable resources 157
- Terminal paging through BMS 160
- Using transient data queues 160
- Transaction failures 161
- HANDLE ABEND commands 162
- Dynamic transaction backout 162
- System failures 163
- START TRANSID commands 165
- Implicit locking for files 166
- Recoverable files 167
- XRCINIT exit 173
- XRCINPT exit 173
- XFCBFAIL global user exit 173
- XFCLDEL global user exit 174
- XFCBOVER global user exit 174
- XFCBOUT global user exit 174
- The CICS-supplied PEP 175
- Your own PEP 176
- Omitting the PEP 177
- Quiescing RLS data sets 179
- INQUIRE DSNAME 187
- INQUIRE UOWDSNFAIL 187
- SHCDS LIST subcommands 188
- CEMT command examples 190
- A special case: lost locks 192
- Overriding retained locks 192
- Post-batch processing 193
- Using the REPRO method 195
- Rebuilding alternate indexes 198
- //SYSIN DD * 200
- SHCDS FRSETRR(old_dsname) 200
- SHCDS FRUNBIND(old_dsname) 200
- Catalog recovery 209
- BWO and concurrent copy 215
- BWO and backups 215
- BWO requirements 216
- Hardware requirements 217
- How you request BWO 218
- Removing BWO attributes 220
- Systems administration 220
- BWO processing 221
- File opening 222
- File closing (non-RLS mode) 224
- Shutdown and restart 225
- Data set backup and restore 225
- VSAM access method services 226
- Forward recovery logging 227
- Chapter 19. Disaster recovery 235
- Disaster recovery testing 236
- Tier 0: no off-site data 237
- Tier 1 - physical removal 237
- Tier 3 - electronic vaulting 239
- Tier 0–3 solutions 240
- Tier 0 - 3 241
- 37453745 242
- Tier 4–6 solutions 245
- PPRC or XRC? 247
- Remote Recovery Data Facility 248
- Disaster recovery facilities 250
- Final summary 252
- Part 4. Appendixes 253
- Trademarks 256
- Bibliography 257
- Other CICS publications 258
- Accessibility 259
- SC34-7012-01 266
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