Examples with "from each source database" and their translation in Japans
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Each database has apply processes that apply changes from each of the other databases. A different apply process must apply changes from each source database.
If another source database transfers log files to this downstream database, then, in the initialization parameter file at this other source database, you can use the TEMPLATE attribute to specify a different directory and format for the log files at the downstream log files from each source database are kept separate at the downstream database.
Captured messages and synchronous messages from multiple databases can be sent to a single destination queue. However, if a single queue contains messages from multiple source databases, then there must be multiple apply processes retrieving these LCRs. Each of these apply processes should be configured to receive messages from exactly one source database using rules. Oracle recommends that you use a separate ANYDATA queue for messages from each source database.
Log files from a remote source database should be kept separate from local database log files. In addition, if the downstream database contains log files from multiple source databases, then the log files from each source database should be kept separate from each other.
Configure each source database to run in ARCHIVELOG mode. For a capture process to capture changes generated at a source database, the source database must be running in ARCHIVELOG mode. In this example, the database must be running in ARCHIVELOG mode. See Oracle Database Administrator's Guide for information about configuring a database to run in ARCHIVELOG mode.
In a large Oracle Streams environment where intermediate databases apply changes, the environment might be easier to monitor and manage because fewer apply processes might be required. An intermediate database that applies changes must have one apply process for each source database from which it receives changes. In an apply forwarding environment, the source databases of an intermediate database are only the databases to which it is directly connected. In a queue forwarding environment, the source databases of an intermediate database are all of the other source databases in the environment, whether they are directly connected to the intermediate database or not.
For the cases when you need a definition array, there are two available methods to manually generate the definition array, one for each schema source - either a database or a schema file.
provides a standard interface that allows one application to access many different data sources. The application's source code does not have to be recompiled for each data source. A database driver links the application to a specific data source. A database driver is a dynamic-link library that an application can invoke on demand to gain access to a particular data source. Therefore, the application can access any data source for which a database driver exists.
With queue forwarding, a destination database must have a separate apply process to apply messages from each source apply forwarding, fewer apply processes might be required at a destination database because recapturing of messages at intermediate databases can result in fewer source databases when changes reach a destination database.
The same restriction applies to synchronous messages captured by multiple synchronous captures at the same source database. These messages should be stored in separate ANYDATA queues, and a separate apply process should apply the messages from each synchronous capture.
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