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MGA Duplica Replication Tool

MGA Duplica Replication Tool. Why Replication?. High Availability and Avoidance of Data Loss Replicate to alternate databases Split activities across databases (one database OLTP and the other Reports)

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MGA Duplica Replication Tool

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  1. MGA Duplica Replication Tool

  2. Why Replication? • High Availability and Avoidance of Data Loss • Replicate to alternate databases • Split activities across databases (one database OLTP and the other Reports) • It is often difficult to achieve acceptable performance when OLTP users are mixed with Report users • Populate Web databases outside main OLTP database • The main database must be secure

  3. Why Replication? • Simplification • Summarisation and aggregation of data to speed performance and reduce development and maintenance time • Similar to materialized views but without the performance and administration overhead of the materialized view logs and without the restrictions of the materialized views • Disaster Recovery • Populate a Disaster Recovery Database • Some sites also use the DB for reporting • Decoupling for High Availability • Avoids one database going down impacting others when database links are used

  4. Regional Database Reporting Database Source Database Web Database Firewall Hot Standby

  5. Why Duplica? • Reliable Replication • Duplica has been replicating from the mission critical 24 * 7 Australian Electricity market database to 38 external power companies for many years • A wide variety of site use the product • Proven technology used by banks, stock exchanges and other companies with large volumes of transactions

  6. Why Duplica? 2.Fast Replication with little impact on source database • Replicates in parallel using multi-threading and array processing • Benchmarks indicate 18,000,000 inserts and 3,000,000 updates and deletes per hour for each thread • You can set a row limit to ease the impact of the data transfer

  7. Why Duplica? 3. Versatility • Runs beautifully on RAC • Runs on any operating system that the Oracle RDBMS supports • Can also replicate to SQL*Server

  8. Why Duplica? 4. Allows staggered replication • Protects your network and source database performance • Replicate critical data right now and non critical data overnight • Allows real time replication on all critical tables

  9. Why Duplica? 5. Vertical and Horizontal partitioning • Why replicate all the data when only certain columns and rows are required • Allows the enforcement of security with sites being replicated to only replicating data that they are entitled to see • Allows you to encrypt data for confidentiality • Allows you to selectively replicate your regional data, for example, replicate Californian data to your local database from the national database

  10. Why Duplica? 6. Fast failover and failback • Have choice of timestamp replication or log based replication • Both allow you to easily see data that is missing after a failover and failback • You cannot lose data with Duplica based replication

  11. Why Duplica? 6. Simplifies Change Management • Dynamically generates the SQL to insert, update and delete at the source database, bringing only the columns that it needs • This allows delayed applying of DDL at the target databases

  12. Why Duplica? 7. Easy Administration • Turning tables to replicate on and off is a breeze • The product runs in robot mode with many sites running the product without a DBA • Duplica contains extensive health checks and auditing when they are required

  13. The Duplica Architecture

  14. The Architecture • Duplica uses Suites to Replicate data • You enter Related Tables into a Suite • You will typically have many Suites • Tables are given a sequence within the Suite to indicate the order of replication • Must maintain referential integrity • Suites can be replicated at different intervals

  15. The Architecture • Duplica detects the data to replicate using either • A LOG table that is populated by a trigger OR • Using a Timestamp column on the source tables (if one exists) • If rows are deleted from tables, you must use the LOG table approach

  16. The Architecture • Sample LOG table • CREATE TABLE "GDS"."STR_LOG“ ( DML_TIMESTAMP DATE , DML_COPY VARCHAR2(1) , DML_OPERATION VARCHAR2(1) , DML_COUNT NUMBER , SYS_DB_ID NUMBER , SYS_PROD_ID NUMBER )

  17. The Architecture • Duplica in installed into the Target Database • The installation includes a number of tables, indexes, views, sequences and stored procedures • Data is pulled from source to the target using the PL/SQL stored procedures • Duplica uses a Delphi front end • Multiple DBAs may have the front end installed in their PCs. They will all access the same Duplica objects in the target databases • DBMS_JOBS is used to schedule the replication of suites

  18. The Architecture • Some sites replicate from one database to another and then from the target database to a 3rd database • This is used for Disaster Recovery as well as creating multiple User Acceptance or Test Database with real data

  19. The User Interface

  20. Audit the row counts at the Source and target database Suites are set up with one or more tables Schedule and unschedule the suite with ease

  21. Place tables into suite Timestamp column Download order provides referential integrity Place your WHERE criteria here for the table. You can also replicate from views

  22. Duplica puts replication, database and error and audit logs at your fingertips

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