|Oracle® TimesTen In-Memory Database Replication Guide
11g Release 2 (11.2.2)
This preface summarizes the new features of Oracle TimesTen In-Memory Database release 11.2.2 that are documented in this guide. It provides links to more information.
When you use
ALTER TABLE to add or drop columns, extraneous space or partitions could be added, which can hinder the performance of replication. If you are using relaxed replication, you can eliminate the extraneous space and partitions with
ttMigrate -relaxedUpgrade. For details, see "Column definition options for replicated tables".
There is a new command, the
-logAnalyze command, in the
ttXactLog utility that analyzes the replication logs to measure how much is left to replicate from the active to a standby master and any subscribers and if the current configuration distributes the load appropriately across all manual and automatic tracks for parallel replication. For more details, see "Analyze outstanding transactions in the replication log".
You can now specify an alias or the IP address of the network interface when you want to use a specific local or remote network interface over which database duplication occurs. For details, see "Duplicating a database".
By default, replication is performed with a single thread. You can increase your performance by configuring parallel replication, which configures multiple threads for sending updates from the source database to the target database and for applying the updates on the target database.
There are two types of parallel replication: automatic and user-defined. In this release, automatic parallel replication is introduced. For more information, see "Configuring parallel replication".
You have additional control over TimesTen application behavior when Oracle Clusterware is managing a TimesTen active standby pair. The
AppUptimeThreshold Clusterware attributes are new. See "Implementing application failover".
Durable commit behavior has changed. See "DURABLE COMMIT".
LOB columns can be replicated. See "Table requirements for active standby pairs" and "Table requirements and restrictions for classic replication schemes".
TimesTen provides in-memory columnar compression. However, you cannot replicate tables with compressed columns. This restriction is mentioned in "Table requirements for active standby pairs" and "Table requirements and restrictions for classic replication schemes".