Oracle 参数 REPLICATION_DEPENDENCY_TRACKING 官方解释,作用,如何配置最优化建议
本站中文解释
REPLICATION_DEPENDENCY_TRACKING是Oracle数据库参数。它用来控制重复项跟踪是否启用,如果启用,在重复变更中,光标依赖于重复段的结构,而不是物理行位置。可以设置为TRUE或FALSE,FALSE是缺省值。
要正确设置这个参数,要根据实际情况来设置。如果你的数据库有重复项跟踪的需求,可以设置为TRUE;如果没有,就可以保留FALSE缺省值。一般来说,在实际开发中,这个参数可以设置为TRUE,可以提高查询效率,而且不会带来问题。
官方英文解释
REPLICATION_DEPENDENCY_TRACKING
enables or disables dependency tracking for read/write operations to the database.
Property | Description |
---|---|
Parameter type |
Boolean |
Default value |
|
Modifiable |
No |
Modifiable in a PDB |
No |
Range of values |
|
Basic |
No |
Dependency tracking is essential for propagating changes in a replicated environment in parallel.
Values
-
TRUE
Enables dependency tracking.
-
FALSE
Allows read/write operations to the database to run faster, but does not produce dependency information for Oracle to perform parallel propagation.
Note:
Do not specify this value unless you are sure that your application will not perform any read/write operations to the replicated tables.