Active - Active or 2-way replication is very similar to 1-way replication. This is used when changes can be made to both databases and they both must be kept in sync.
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For each replication pair, the objects to be replicated have to specified. This can be the same or different for each replication pair.
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Step 3 - Replicated tables ======================================== The third step is to choose the schemas and tables to be replicated. If the databases are reachable, the tables are checked for existence, datatype support, etc., schemas are queried for tables. Note that all messages are merely hints/warnings and may be ignored if issues are rectified before the scripts are actually executed. Note theFollowing followingtables assumptionsare aredefined madefor inreplication this wizard - which can be modified by editing the resulting script: 1. All replicated tables have a primary keypairs: 1:reptest1 (Oracle) ==> reptest2 (Oracle), DDL: yes, suffix: (no suffix), prepare: single-scn No tables defined. 2. All columns of the tables and all tables of the specified schemas are replicated, and if DDL support is enabled, whenever a new column/table is added, this should be replicate as well. 3. If an apply conflict arises, the default option is to try again repeatedly, until a different option is given or the underlying issue is resolved. 4. If an apply conflict arises, no more data will be replicated until the issue is resolved or ignored. You can also specify some advanced options: 1. Rename schemas or tables. 2. Specify filtering conditions. 3. (Tables only) Configure Change Data Capture; this does not maintain a copy of the source table, but logs all operations as separate entries. This is useful for ETL or as an audit trail. This usually requires adding of new columns (timestamps, old/new values etc.) to the target table. Dbvisit Replicate can create the target table with the additional columns during setup by selecting "ddl_run" in the data copy section of Step 2. Following tables are defined for replication pairs: 1: reptest1 (Oracle) ==> reptest2 (Oracle), DDL: no, suffix: (no suffix), prepare: single-scn No tables defined. 2: reptest2 (Oracle) ==> reptest1 (Oracle), DDL: no, suffix: 1, prepare: single-scn No tables defined. Enter number of replication pair to modify it, or "done": [1] Please enter list of all individual tables to be replicated. Enter schema name(s) only to replicate all tables in that schema. Use comma or space to delimit the entries. Enter the tables and schemas: [] test1,avi.emp Selected schemas: TEST1 Selected tables: AVI.EMP Add more tables or schemas? (YES/NO) [NO] To replicate changes of PL/SQL objects in schema(s), please enter the schemas to be :reptest2 (Oracle) ==> reptest1 (Oracle), DDL: yes, suffix: 1, prepare: single-scn No tables defined. Enter number of replication pair to modify it, or "done": [1] Please enter list of all individual tables to be replicated. Enter schema name(s) only to replicate all tables in that schema. Use comma or space to delimit the entries. Enter the tables and schemas: [] AVI Selected schemas: AVI Add more tables or schemas? (YES/NO) [NO] To replicate changes of PL/SQL objects in schema(s), please enter the schemas to be replicated. Note that specifying any entry will cause additional privileges to be granted to dbvrep. Enter through a comma or space-delimited list. Enter the list of schemas (PL/SQL): [] Specify rename name or filter condition for any of the specified schemas (YES/NO): [no] Specify rename name, filter condition, CDC/Audit/ETL for any of the specified tables (yes/no): [no] Following tables are defined for replication pairs: 1: reptest1 (Oracle) ==> reptest2 (Oracle), DDL: no, suffix: (no suffix), prepare: single-scn TEST1(tables), AVI.EMP 2: reptest2 (Oracle) ==> reptest1 (Oracle), DDL: no, suffix: 1, prepare: single-scn No tables defined. Enter number of replication pair to modify it, or "done": [2] Please enter list of all individual tables to be replicated. Enter schema name(s) only to replicate all tables in that schema. Use comma or space to delimit the entries. Enter the tables and schemas: [] test1,avi.emp Selected schemas: TEST1 Selected tables: AVI.EMP Add more tables or schemas? (YES/NO) [NO] To replicate changes of PL/SQL objects in schema(s), please enter the schemas to be replicated. Note that specifying any entry will cause additional privileges to be granted to dbvrep. Enter through a comma or space-delimited list. Enter the list of schemas (PL/SQL): [] You can also specify some advanced options: 1. Rename schemas or tables. 2. Specify filtering conditions. 3. (Tables only) Configure Change Data Capture; this does not maintain a copy of the source table, but logs all operations as separate entries. This is useful for ETL or as an audit trail. This usually requires adding of new columns (timestamps, old/new values etc.) to the target table. Specify rename name or filter condition for any of the specified schemas (YES/NO): [no] no] Following tables are defined for replication pairs: 1: reptest1 (Oracle) ==> reptest2 (Oracle), DDL: no, suffix: (no suffix), prepare: single-scn AVI(tables) 2: reptest2 (Oracle) ==> reptest1 (Oracle), DDL: no, suffix: (no suffix), prepare: single-scn No tables defined. Enter number of replication pair to modify it, or "done": [2] Please enter list of all individual tables to be replicated. Enter schema name(s) only to replicate all tables in that schema. Use comma or space to delimit the entries. Enter the tables and schemas: [] AVI Selected schemas: AVI Add more tables or schemas? (YES/NO) [NO] To replicate changes of PL/SQL objects in schema(s), please enter the schemas to be replicated. Note that specifying any entry will cause additional privileges to be granted to dbvrep. Enter through a comma or space-delimited list. Enter the list of schemas (PL/SQL): [] You can also specify some advanced options: 1. Rename schemas or tables. 2. Specify filtering conditions. 3. (Tables only) Configure Change Data Capture; this does not maintain a copy of the source table, but logs all operations as separate entries. This is useful for ETL or as an audit trail. This usually requires adding of new columns (timestamps, old/new values etc.) to the target table. Specify rename name, or filter condition, CDC/Audit/ETL for any of the specified tablesschemas (yesYES/noNO): [no] Following tables are defined for replication pairs: 1: reptest1 (Oracle) ==> reptest2 (Oracle), DDL: no, suffix: (no suffix), prepare: single-scn TEST1 AVI(tables), AVI.EMP 2: reptest2 (Oracle) ==> reptest1 (Oracle), DDL: no, suffix: (no 1suffix), prepare: single-scn TEST1AVI(tables), AVI.EMP Enter number of replication pair to modify it, or "done": [done] |
Step 4 - Process configuration
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Step 4 - Process configuration ======================================== The fourth step is to configure the replication processes for each replication. Although most options have reasonable defaults, manual input is required. Following processes are defined: 1: MINE on reptest1 Not configured. 2: APPLY on reptest2 Not configured. 3: MINE1 on reptest2 Not configured. 4: APPLY1 on reptest1 Not configured. Enter number of process to modify it, or "done": [1] Fully qualified name of the server for the process (usually co-located with the database, unless mine is offloaded using fetcher): [dbvldemo101] Server type (Windows/Linux/Unix): [Linux] Enable email notifications about problems (yes/no)? [YESNO] n Enable SNMP traps/notifications about problems (yes/no)? [NO] Directory with DDC file and default where to create log files etc. (recommended: same as global setting, if possible)? [/home/oracle/reptest1] Following settings were pre-filled with defaults or your reloaded settings: ---------------------------------------- [MINE_REMOTE_INTERFACE]: Network remote interface: dbvldemo101:7901 [MINE_DATABASE]: Database TNS: reptest1 [TNS_ADMIN]: tnsnames.ora path: /u01/app/oracle/product/11.2.0/dbhome_1/network/admin [MINE_USER]: Dbvisit Replicate database username: dbvrep [MINE_PASSWORD]: Dbvisit Replicate database password: ********* [MINE_PLOG]: Filemask for generated plogs: /home/oracle/reptest1/mine/%S.%E (%S is sequence, %T thread, %F original filename (stripped extension), %P process type, %N process name, %E default extension) [LOG_FILE]: General log file: /home/oracle/reptest1/log/dbvrep_%N_%D.%E [LOG_FILE_TRACE]: Error traces: /home/oracle/reptest1/log/trace/dbvrep_%N_%D_%I_%U.%E Checking that these settings are valid... Do you want change any of the settings? [no] Following processes are defined: 1: MINE on reptest1 Host: dbvldemo101, SMTP: NO, SNMP: NO 2: APPLY on reptest2 Not configured. 3: MINE1 on reptest2 Not configured. 4: APPLY1 on reptest1 Not configured. Enter number of process to modify it, or "done": [2] Fully qualified name of the server for the process (usually co-located with the database, unless mine is offloaded using fetcher): [dbvldemo102] Server type (Windows/Linux/Unix): [Linux] Enable email notifications about problems (yes/no)? [YESNO] n Enable SNMP traps/notifications about problems (yes/no)? [NO] Directory with DDC file and default where to create log files etc. (recommended: same as global setting, if possible)? [/home/oracle/reptest1] Following settings were pre-filled with defaults or your reloaded settings: ---------------------------------------- [APPLY_REMOTE_INTERFACE]: Network remote interface: dbvldemo102:7902 [APPLY_DATABASE]: Database TNS: reptest2 [TNS_ADMIN]: tnsnames.ora path: /u01/app/oracle/product/11.2.0/dbhome_1/network/admin [APPLY_USER]: Dbvisit Replicate database username: dbvrep [APPLY_PASSWORD]: Dbvisit Replicate database password: ********* [APPLY_STAGING_DIR]: Directory for received plogs: /home/oracle/reptest1/apply [LOG_FILE]: General log file: /home/oracle/reptest1/log/dbvrep_%N_%D.%E [LOG_FILE_TRACE]: Error traces: /home/oracle/reptest1/log/trace/dbvrep_%N_%D_%I_%U.%E Checking that these settings are valid... Do you want change any of the settings? [no] Following processes are defined: 1: MINE on reptest1 Host: dbvldemo101, SMTP: NO, SNMP: NO 2: APPLY on reptest2 Host: dbvldemo102, SMTP: NO, SNMP: NO 3: MINE1 on reptest2 Not configured. 4: APPLY1 on reptest1 Not configured. Enter number of process to modify it, or "done": [3] Fully qualified name of the server for the process (usually co-located with the database, unless mine is offloaded using fetcher): [dbvldemo102] Server type (Windows/Linux/Unix): [Linux] Enable email notifications about problems (yes/no)? [YESNO] n Enable SNMP traps/notifications about problems (yes/no)? [NO] Directory with DDC file and default where to create log files etc. (recommended: same as global setting, if possible)? [/home/oracle/reptest1] Following settings were pre-filled with defaults or your reloaded settings: ---------------------------------------- [MINE_REMOTE_INTERFACE]: Network remote interface: dbvldemo102:7903 [MINE_DATABASE]: Database TNS: reptest2 [TNS_ADMIN]: tnsnames.ora path: /u01/app/oracle/product/11.2.0/dbhome_1/network/admin [MINE_USER]: Dbvisit Replicate database username: dbvrep [MINE_PASSWORD]: Dbvisit Replicate database password: ********* [MINE_PLOG]: Filemask for generated plogs: /home/oracle/reptest1/mine1/%S.%E (%S is sequence, %T thread, %F original filename (stripped extension), %P process type, %N process name, %E default extension) [LOG_FILE]: General log file: /home/oracle/reptest1/log/dbvrep_%N_%D.%E [LOG_FILE_TRACE]: Error traces: /home/oracle/reptest1/log/trace/dbvrep_%N_%D_%I_%U.%E Checking that these settings are valid... Do you want change any of the settings? [no] Following processes are defined: 1: MINE on reptest1 Host: dbvldemo101, SMTP: NO, SNMP: NO 2: APPLY on reptest2 Host: dbvldemo102, SMTP: NO, SNMP: NO 3: MINE1 on reptest2 Host: dbvldemo102, SMTP: NO, SNMP: NO 4: APPLY1 on reptest1 Not configured. Enter number of process to modify it, or "done": [4] Fully qualified name of the server for the process (usually co-located with the database, unless mine is offloaded using fetcher): [dbvldemo101] Server type (Windows/Linux/Unix): [Linux] Enable email notifications about problems (yes/no)? [YESNO] n Enable SNMP traps/notifications about problems (yes/no)? [NO] Directory with DDC file and default where to create log files etc. (recommended: same as global setting, if possible)? [/home/oracle/reptest1] Following settings were pre-filled with defaults or your reloaded settings: ---------------------------------------- [APPLY_REMOTE_INTERFACE]: Network remote interface: dbvldemo101:7904 [APPLY_DATABASE]: Database TNS: reptest1 [TNS_ADMIN]: tnsnames.ora path: /u01/app/oracle/product/11.2.0/dbhome_1/network/admin [APPLY_USER]: Dbvisit Replicate database username: dbvrep [APPLY_PASSWORD]: Dbvisit Replicate database password: ********* [APPLY_STAGING_DIR]: Directory for received plogs: /home/oracle/reptest1/apply1 [LOG_FILE]: General log file: /home/oracle/reptest1/log/dbvrep_%N_%D.%E [LOG_FILE_TRACE]: Error traces: /home/oracle/reptest1/log/trace/dbvrep_%N_%D_%I_%U.%E Checking that these settings are valid... Do you want change any of the settings? [no] Following processes are defined: 1: MINE on reptest1 Host: dbvldemo101, SMTP: NO, SNMP: NO 2: APPLY on reptest2 Host: dbvldemo102, SMTP: NO, SNMP: NO 3: MINE1 on reptest2 Host: dbvldemo102, SMTP: NO, SNMP: NO 4: APPLY1 on reptest1 Host: dbvldemo101, SMTP: NO, SNMP: NO Enter number of process to modify it, or "done": [done] |
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oracle@dbvldemo101[/home/oracle/reptest1]: ./reptest1-all.sh Setting up Dbvisit Replicate configuration Configure database reptest1... This check fails if the DBID is not the expected one... Ok, check passed. Configure database reptest2... This check fails if the DBID is not the expected one... Ok, check passed. Object grants for database reptest1... Object grants for database reptest2... Setting up the configuration Initializing......done WARN-1850: No DDC DB available, dictionary table does not exist. DDC loaded from database (0 variables). Dbvisit Replicate version 2.4x.31x.3038x Copyright (C) Dbvisit Software Limited. All rights reserved. DDC file /home/oracle/reptest1/reptest1-onetime.ddc loaded. MINE: Cannot determine Dbvisit Replicate dictionary version. (no dictionary exists) APPLY: Cannot determine Dbvisit Replicate dictionary version. (no dictionary exists) dbvrep> set ON_WARNING SKIP Variable ON_WARNING set to SKIP for process *. dbvrep> set ON_ERROR EXIT Variable ON_ERROR set to EXIT for process *. dbvrep> ENGINE SWITCH_REDOLOG dbvrep> ENGINE SETUP MINE DROP DICTIONARY 0 dictionary objects dropped. dbvrep> ENGINE SETUP MINE CREATE DICTIONARY dbvrep> ENGINE SETUP MINE LOAD DICTIONARY Supplemental logging on database set. Loading dictionary table DBRSCOL$ Loading dictionary table DBRSIND$ Loading dictionary table DBRSOBJ$ Loading dictionary table DBRSTAB$ Loading dictionary table DBRSUSER$ Loading dictionary table DBRSV_$DATABASE dbvrep> ENGINE SETUP APPLY DROP DICTIONARY 0 dictionary objects dropped. dbvrep> ENGINE SETUP APPLY CREATE DICTIONARY dbvrep> ENGINE SETUP APPLY LOAD DICTIONARY dbvrep> ENGINE PREPARE_DP SETUP CLEAR dbvrep> ENGINE SETUP PAIR MINE AND APPLY ID of mine proces is F8908CFE-F408-11E2-ABE7-37F589F7C5BA. If not using DDC in database, set MINE_UNIQUE_ID to this value. 1 applier SCN set. dbvrep> SET APPLY.INSTANTIATE_SCN NOW Variable INSTANTIATE_SCN set to NOW for process APPLY. dbvrep> ENGINE SUPPLEMENTAL LOGGING SCHEMA TEST1 ENABLE PRIMARY KEY dbvrep> ENGINE SUPPLEMENTAL LOGGING TABLE AVI.EMP ENABLE PRIMARY KEY dbvrep> ENGINE SWITCH_REDOLOG dbvrep> ENGINE WAIT_SCN_FLIP Waited 3 seconds until scn_to_timestamp changed. dbvrep> #single-scn instantiation: lock all tables and schemas dbvrep> ENGINE LOCK TABLES AVI.EMP Locking all tables. Lock done. dbvrep> ENGINE LOCK SCHEMAS TEST1 Locking all schemas. Lock done. dbvrep> #single-scn instantiation: unlock all tables and schemas, but keep the SCN dbvrep> ENGINE LOCK RELEASE LOCKS dbvrep> dbvrep> #prepare the tables (we use OFFLINE as neither MINE not APPLY is running; with OFFLINE we won't wait on network timeout) dbvrep> PREPARE OFFLINE SCHEMA TEST1 Table TEST1.DEPT instantiated at SCN 7849244 Table TEST1.EMP instantiated at SCN 7849244 dbvrep> PREPARE OFFLINE TABLE AVI.EMP Table AVI.EMP instantiated at SCN 7849244 dbvrep> #single-scn instantiation: unlock all tables and schemas, forget the SCN (so it does not affect any further PREPARE statements) dbvrep> ENGINE LOCK CLEAR SCN dbvrep> ENGINE SWITCH_REDOLOG dbvrep> #prepare script for instantiation dbvrep> ENGINE PREPARE_DP WRITE DP_NETWORKLINK DIRECTORY DATA_PUMP_DIR FILE /home/oracle/reptest1/APPLY.sh DBLINK reptest1 USERID SYSTEM/odb10g@reptest2password@reptest2 Created Data Pump script /home/oracle/reptest1/APPLY.sh, using network import. dbvrep> dbvrep> # Configuring non-default processes dbvrep> choose process MINE1 Process type MINE set to: MINE1. dbvrep> choose process APPLY1 Process type APPLY set to: APPLY1. dbvrep> ENGINE SWITCH_REDOLOG dbvrep> ENGINE SETUP MINE LOAD DICTIONARY Supplemental logging on database set. Loading dictionary table DBRSCOL$ Loading dictionary table DBRSIND$ Loading dictionary table DBRSOBJ$ Loading dictionary table DBRSTAB$ Loading dictionary table DBRSUSER$ Loading dictionary table DBRSV_$DATABASE dbvrep> ENGINE SETUP APPLY LOAD DICTIONARY dbvrep> ENGINE PREPARE_DP SETUP CLEAR dbvrep> ENGINE SETUP PAIR MINE AND APPLY ID of mine proces is 0695067C-F409-11E2-ABE7-37F589F7C5BA. If not using DDC in database, set MINE_UNIQUE_ID to this value. 1 applier SCN set. dbvrep> SET APPLY1.INSTANTIATE_SCN NOW Variable INSTANTIATE_SCN set to NOW for process APPLY1. dbvrep> ENGINE SUPPLEMENTAL LOGGING SCHEMA TEST1 ENABLE PRIMARY KEY dbvrep> ENGINE SUPPLEMENTAL LOGGING TABLE AVI.EMP ENABLE PRIMARY KEY dbvrep> ENGINE SWITCH_REDOLOG dbvrep> ENGINE WAIT_SCN_FLIP Waited 2 seconds until scn_to_timestamp changed. dbvrep> #single-scn instantiation: lock all tables and schemas dbvrep> ENGINE LOCK TABLES AVI.EMP Locking all tables. Lock done. dbvrep> ENGINE LOCK SCHEMAS TEST1 Locking all schemas. Lock done. dbvrep> #single-scn instantiation: unlock all tables and schemas, but keep the SCN dbvrep> ENGINE LOCK RELEASE LOCKS dbvrep> dbvrep> #prepare the tables (we use OFFLINE as neither MINE not APPLY is running; with OFFLINE we won't wait on network timeout) dbvrep> PREPARE OFFLINE SCHEMA TEST1 Table TEST1.DEPT instantiated at SCN 7830009 Table TEST1.EMP instantiated at SCN 7830009 dbvrep> PREPARE OFFLINE TABLE AVI.EMP Table AVI.EMP instantiated at SCN 7830009 dbvrep> #single-scn instantiation: unlock all tables and schemas, forget the SCN (so it does not affect any further PREPARE statements) dbvrep> ENGINE LOCK CLEAR SCN dbvrep> ENGINE SWITCH_REDOLOG dbvrep> #prepare script for instantiation dbvrep> ENGINE PREPARE_DP WRITE DP_NETWORKLINK DIRECTORY DATA_PUMP_DIR FILE /home/oracle/reptest1/APPLY1.sh DBLINK reptest2 USERID SYSTEM/odb10g@reptest1password@reptest1 Created Data Pump script /home/oracle/reptest1/APPLY1.sh, using network import. dbvrep> create ddcdb from ddcfile DDC loaded into database (291 variables). dbvrep> set ON_WARNING SKIP Variable ON_WARNING set to SKIP for process *. dbvrep> set ON_ERROR SKIP Variable ON_ERROR set to SKIP for process *. OK-0: Completed, but some operation(s) raised warnings and/or errors. These steps are required after the reptest1-all.sh script runs: 1) Create the necessary directory(ies) on the servers: dbvldemo102: /home/oracle/reptest1 2) Copy the DDC files to the server(s) where the processes will run: dbvldemo102: /home/oracle/reptest1/reptest1-APPLY.ddc dbvldemo101: /home/oracle/reptest1/reptest1-APPLY1.ddc dbvldemo101: /home/oracle/reptest1/reptest1-MINE.ddc dbvldemo102: /home/oracle/reptest1/reptest1-MINE1.ddc 3) Review that path to dbvrep executable is correct in the run scripts: /home/oracle/reptest1/reptest1-run-dbvldemo101.sh /home/oracle/reptest1/reptest1-run-dbvldemo102.sh 4) Copy the run script to the server(s) where the processes will run: /home/oracle/reptest1/reptest1-run-dbvldemo101.sh /home/oracle/reptest1/reptest1-run-dbvldemo102.sh 5) Ensure firewall is open for listen interfaces 0.0.0.0:7902, 0.0.0.0:7904, 0.0.0.0:7901, 0.0.0.0:7903 used by the processes. 6) Make sure the data on apply are in sync as of time when setup was run. Scripts for Data Pump/export/DDL were created as requested: /home/oracle/reptest1/APPLY.sh /home/oracle/reptest1/APPLY1.sh Create referenced database links (if any) before running the scripts. 7) Start the replication processes on all servers: /home/oracle/reptest1/reptest1-run-dbvldemo101.sh /home/oracle/reptest1/reptest1-run-dbvldemo102.sh 8) Start the console to monitor the progress: /home/oracle/reptest1/start-console.sh The above list is stored in /home/oracle/reptest1/Nextsteps.txt. |
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** The above steps are very important to follow one by one. This includes copying of files the wizard created to the target host.
Running scripts from Step #6 is necessary as well.
Start replication by running the scripts ( reptest1-run-dbvldemo101.sh and reptest1-run-dbvldemo102.sh) has commands to start both a MINE and APPLY on each server.
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With 2-way replication the table listing in the console can so long that the prompt cannot be seen. By default, 30 tables are listed for each replication, thus for a 2-way replication, it takes up to 70 screen lines.
To change this, edit the *-MINE.ddc file and add line "set STATUS_BAR_ACTIVE_TABLES 5". Or enter this command at the console prompt. Restart the console for this change to take affect.