In today’s article, I will talk about Disabling And Enabling Data Guard Broker Transport Services.
Below is how to make Redo Transport Services disabled from the broker by deferring the LOG_ARCHIVE_DEST_STATE_n parameter with SQL commands.
1. We learn thread# and sequence# before disabling Redo Transport Services.
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[Primary-1] SQL> select max(sequence#), thread# from v$archived_log group by thread#; MAX(SEQUENCE#) THREAD# -------------- ---------- 379 1 242 2 [Physical-1] SQL> select max(sequence#), thread# from v$archived_log group by thread#; MAX(SEQUENCE#) THREAD# -------------- ---------- 379 1 242 2 [Logical-1] SQL> select max(sequence#), thread#, applied from dba_logstdby_log group by thread#, applied; MAX(SEQUENCE#) THREAD# APPLIED -------------- ---------- -------- 379 1 YES 242 2 YES |
2. Redo Transport services are disabled.
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DGMGRL> edit database primary set state='TRANSPORT-OFF'; Succeeded. [Primary-1]--> ALERT LOG ALTER SYSTEM SET log_archive_dest_state_2='RESET' SCOPE=BOTH; ALTER SYSTEM SET log_archive_dest_state_3='RESET' SCOPE=BOTH; |
3. We perform the Log Switch operation.
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[Primary-1] SQL> alter system switch logfile; System altered. [Primary-1] SQL> alter system switch logfile; System altered. [Primary-1] SQL> alter system switch logfile; System altered. |
4. We check whether the Archive Redo Logs go to the Standby side.
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[Primary-1] SQL> select max(sequence#), thread# from v$archived_log group by thread#; MAX(SEQUENCE#) THREAD# -------------- ---------- 382 1 243 2 [Physical-1] SQL> select max(sequence#), thread# from v$archived_log group by thread#; MAX(SEQUENCE#) THREAD# -------------- ---------- 380 1 243 2 [Logical-1] SQL> select max(sequence#), thread#, applied from dba_logstdby_log group by thread#, applied; MAX(SEQUENCE#) THREAD# APPLIED -------------- ---------- -------- 380 1 CURRENT 379 1 YES 242 2 YES 243 2 CURRENT |
5. We perform the commissioning process again.
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DGMGRL> edit database primary set state='TRANSPORT-ON'; Succeeded [Primary-1]--> ALERT LOG ALTER SYSTEM SET log_archive_dest_state_2='ENABLE' SCOPE=BOTH; ALTER SYSTEM SET log_archive_dest_state_3='ENABLE' SCOPE=BOTH; |
6. We check whether the Archive Redo Logs go to the Standby side.
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[Primary-1] SQL> select max(sequence#), thread# from v$archived_log group by thread#; MAX(SEQUENCE#) THREAD# -------------- ---------- 383 1 244 2 [Physical-1] SQL> select max(sequence#), thread# from v$archived_log group by thread#; MAX(SEQUENCE#) THREAD# -------------- ---------- 383 1 244 2 [Logical-1] SQL> select max(sequence#), thread#, applied from dba_logstdby_log group by thread#, applied; MAX(SEQUENCE#) THREAD# APPLIED -------------- ---------- -------- 383 1 YES 244 2 YES [Logical-1] SQL> select sequence#, applied from dba_logstdby_log order by sequence#; SEQUENCE# APPLIED ---------- -------- 186 YES 187 YES 188 YES 189 YES 190 YES 191 YES 192 YES 193 YES 194 YES 195 YES 196 YES SEQUENCE# APPLIED ---------- -------- 197 YES 198 YES 199 YES 200 YES 201 YES 202 YES 203 YES 204 YES 205 YES 206 YES 207 YES SEQUENCE# APPLIED ---------- -------- 208 YES 209 YES 210 YES 211 YES 212 YES 213 YES 214 YES 215 YES 216 YES 217 YES 218 YES SEQUENCE# APPLIED ---------- -------- 219 YES 220 YES 221 YES 222 YES 223 YES 224 YES 225 YES 226 YES 227 YES 228 YES 229 YES SEQUENCE# APPLIED ---------- -------- 230 YES 231 YES 232 YES 233 YES 234 YES 235 YES 236 YES 237 YES 238 YES 239 YES 240 YES SEQUENCE# APPLIED ---------- -------- 241 YES 242 YES 243 YES 244 YES 324 YES 325 YES 326 YES 327 YES 328 YES 329 YES 330 YES SEQUENCE# APPLIED ---------- -------- 331 YES 332 YES 333 YES 334 YES 335 YES 336 YES 337 YES 338 YES 339 YES 340 YES 341 YES SEQUENCE# APPLIED ---------- -------- 342 YES 343 YES 344 YES 345 YES 346 YES 347 YES 348 YES 349 YES 350 YES 351 YES 352 YES SEQUENCE# APPLIED ---------- -------- 353 YES 354 YES 355 YES 356 YES 357 YES 358 YES 359 YES 360 YES 361 YES 362 YES 363 YES SEQUENCE# APPLIED ---------- -------- 364 YES 365 YES 366 YES 367 YES 368 YES 369 YES 370 YES 371 YES 372 YES 373 YES 374 YES SEQUENCE# APPLIED ---------- -------- 375 YES 376 YES 377 YES 378 YES 379 YES 380 YES 381 YES 382 YES 383 YES 119 rows selected. |
7. Redo Transport is stopped in a specific standby, not in all standbys, as follows.
a. Redo Transport to Logical Standby is stopped.
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DGMGRL> edit database logical set property LogShipping=OFF; Property "logshipping" updated |
b. We check if the parameter is DEFER.
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[Primary-1] SQL> show parameter log_archive_dest_state_3 NAME TYPE VALUE ------------------------------------ ----------- ------------------------------ log_archive_dest_state_3 string RESET |
c. With Log Switch, a test is performed to understand whether the Redos go on the Logical side. For this, we first learn the SEQUENCEs available in Primary and Logical.
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[Primary-1] SQL> select max(sequence#),thread#,archived from v$archived_log where first_time > to_date('27/01/2017 13:41:50', 'DD-MM-YYYY HH24:MI:SS') group by thread#,archived order by thread#, max(sequence#); MAX(SEQUENCE#) THREAD# ARC -------------- ---------- --- 394 1 YES 230 2 YES [Logical-1] SQL> SELECT max(sequence#),thread#,applied FROM dba_logstdby_log where first_time > to_date('27/01/2017 13:41:50', 'DD-MM-YYYY HH24:MI:SS') group by thread#, applied order by thread#, max(sequence#); MAX(SEQUENCE#) THREAD# APPLIED -------------- ---------- -------- 393 1 YES 394 1 CURRENT 229 2 YES 230 2 CURRENT |
d. We do the Log Switch operation.
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[Primary-1] SQL> alter system switch logfile; System altered. [Primary-1] SQL> alter system switch logfile; System altered. |
f. We check the SEQUENCEs.
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[Primary-1] SQL> select max(sequence#),thread#,archived from v$archived_log where first_time > to_date('27/01/2017 13:41:50', 'DD-MM-YYYY HH24:MI:SS') group by thread#,archived order by thread#, max(sequence#); MAX(SEQUENCE#) THREAD# ARC -------------- ---------- --- 396 1 YES 230 2 YES [Logical-1] SQL> SELECT max(sequence#),thread#,applied FROM dba_logstdby_log where first_time > to_date('27/01/2017 13:41:50', 'DD-MM-YYYY HH24:MI:SS') group by thread#, applied order by thread#, max(sequence#); MAX(SEQUENCE#) THREAD# APPLIED -------------- ---------- -------- 393 1 YES 394 1 CURRENT 229 2 YES 230 2 CURRENT |
g. The Redo stream that was stopped in the specific Standby is started.
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DGMGRL> edit database logical set property LogShipping=ON; Property "logshipping" updated |
i. It is checked whether the parameter is ENABLE or not.
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[Primary-1] SQL> show parameter log_archive_dest_state_3 NAME TYPE VALUE ------------------------------------ ----------- ------------------------------ log_archive_dest_state_3 string ENABLE |
h. It is checked whether the redos pass to Logical Standby.
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[Primary-1] SQL> select max(sequence#),thread#,archived from v$archived_log where first_time > to_date('27/01/2017 13:41:50', 'DD-MM-YYYY HH24:MI:SS') group by thread#,archived order by thread#, max(sequence#); MAX(SEQUENCE#) THREAD# ARC -------------- ---------- --- 397 1 YES 231 2 YES [Logical-1] SQL> SELECT max(sequence#),thread#,applied FROM dba_logstdby_log where first_time > to_date('27/01/2017 13:41:50', 'DD-MM-YYYY HH24:MI:SS') group by thread#, applied order by thread#, max(sequence#); MAX(SEQUENCE#) THREAD# APPLIED -------------- ---------- -------- 397 1 YES 231 2 YES |
