In the complex and heterogeneous environments, when the data volume is high you can consider using transportable tablespace for the data instantiation. The tablespace is required to be switched to read-only mode therefore you can use this option if outage on source database is acceptable otherwise you can create a duplicate database and use that for this task.
Dbvisit Replicate uses the SCN to mark the starting point of where to start replicating from. Only changes made from the SCN specified are replicated. Therefore, you have to get the SCN from where you want to start the replication. If you are using duplicate database then recover that database upto that SCN before using it for transportable tablespace task.
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Transportable tablespace feature can only be used on Oracle Enterprise Edition. |
Example:
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RMAN> duplicate target database to reptest1 until scn 811782 |
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Following is a step-by-step illustrative example of using transportable tablespace for data instantiation before configuring Dbvisit Replicate. Following environment is used in this example.
| Server/Database | Name |
|---|---|
| Source database | reptest1 |
| Source server | dbvldemo101 (Linux) |
| Standby/Target database | reptest2 |
| Target server | dbvisit410(Linux) |
| TNS alias for source database | reptest1 |
| TNS alias for target database | reptest2 |
| Oracle | 11.2.0.3.0 |
| Tablespace | data |
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The source database is used in this example therefore creation of duplicate database is not included. |
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SQL> conn test/test Connected. SQL> select * from tab where tabtype='TABLE'; TNAME TABTYPE CLUSTERID ------------------------------ ------- ---------- WAREHOUSES TABLE PRODUCT_INFORMATION TABLE PRODUCT_DESCRIPTIONS TABLE ORDER_ITEMS TABLE ORDERS TABLE ORDERENTRY_METADATA TABLE LOGON TABLE INVENTORIES TABLE CUSTOMERS TABLE 9 rows selected. SQL> select round(sum(bytes/1024/1024/1024),3) SIZE_GB from user_segments; SIZE_GB ---------- 2.85 |
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If the endian formats are different then a conversion is necessary for transporting the tablespace. It can be done using RMAN convert tablespace and convert datafile commands. In this example endian formats are identical on the source and the target. |
1. Check whether tablespace is self-contained or not. We can only transport a tablespaces that is self-contained.
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SQL> EXECUTE dbms_tts.transport_set_check('DATA',TRUE);
PL/SQL procedure successfully completed.
SQL> SELECT * FROM TRANSPORT_SET_VIOLATIONS;
no rows selected. |
The TRANSPORT_SET_VIOLATIONS view is empty, so the tablespace data is self-contained
2. Set tablespace to read-only mode.
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SQL> alter tablespace data read only; Tablespace altered. |
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SQL> select current_scn from v$database; CURRENT_SCN ----------- 5568749 |
4. Export the metadata of tablespace data.
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oracle@dbvldemo101[/home/oracle] expdp system/****** dumpfile=tbs_data_exp.dmp transport_tablespaces=data transport_full_check=y logfile=tes_tbs_export.log Connected to: Oracle Database 11g Release 11.2.0.3.0 - 64bit Production Export: Release 11.2.0.3.0 - Production on Wed Jul 10 15:40:41 2013 Copyright (c) 1982, 2011, Oracle and/or its affiliates. All rights reserved. Connected to: Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 Starting "SYSTEM"."SYS_EXPORT_TRANSPORTABLE_01": system/******** dumpfile=tbs_data_exp.dmp transport_tablespaces=data transport_full_check=y logfile=tes_tbs_export.log Processing object type TRANSPORTABLE_EXPORT/PLUGTS_BLK Processing object type TRANSPORTABLE_EXPORT/TABLE Processing object type TRANSPORTABLE_EXPORT/INDEX Processing object type TRANSPORTABLE_EXPORT/INDEX_STATISTICS Processing object type TRANSPORTABLE_EXPORT/TABLE_STATISTICS Processing object type TRANSPORTABLE_EXPORT/POST_INSTANCE/PLUGTS_BLK Master table "SYSTEM"."SYS_EXPORT_TRANSPORTABLE_01" successfully loaded/unloaded ****************************************************************************** Dump file set for SYSTEM.SYS_EXPORT_TRANSPORTABLE_01 is: /u01/app/oracle/product/11.2.0/dbhome_1/rdbms/log/tbs_data_exp.dmp Job "SYSTEM"."SYS_EXPORT_TRANSPORTABLE_01" successfully completed at 14:07:44 |
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SQL> alter tablespace data read write; |
9. Now, you can configure Dbvisit Replicate by running setup wizard on the source server.
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