Database synchronization tool

Database synchronization tool

goden gate 
Oracle Golden Gate software is a log-based structured data replication backup software. It obtains incremental changes of data by parsing the online log or archived log of the source database, and
then applies these changes to the target database to achieve The source database is synchronized with the target database.


The synchronization of Red Gate Sql Compare
only synchronizes database objects (stored procedures, custom functions, indexes, table structures, etc.), as for the content of the table, it will not be synchronized. So don't worry that the contents of the table will be emptied.


Data
Guard The basic principle of Data Guard is that when a transaction makes a change to the data in the production database, the Oracle database records the change in an online redo log file.
The process of writing logs can be configured in Data Guard. In addition to recording logs in local online log files and archived log files, log information can also be sent
to a . This alternate log file writing process can be real-time, synchronous for zero data loss (maximum protection mode); asynchronous
to reduce pressure on network bandwidth (maximum availability mode); or by archiving log files , a bulk transfer mode for log files to reduce the performance impact on production systems
(maximum performance mode). When the backup database receives log information, Data Guard can automatically use the log information to synchronize data. When the primary database is open and active, the
standby database can perform recovery operations, and if the primary database fails, the standby database can be activated and take over the work of the production database



DBSync



Kettle
Kettle is a set of ETL tools that allow you to manage data from different databases by providing a graphical user environment that describes what you want to do, not how you want to do it.
There are two script files in Kettle, transformation and job. Transformation completes the basic transformation of data, and job completes the control of the entire workflow.
Data can be selected and replicated

http://www.cnblogs.com/wingsless/p/3187436.html



canal
provides incremental data subscription & consumption based on database incremental log analysis. Currently, it mainly supports mysql
, which is based on full volume. copy