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2025-01-19 Update From: SLTechnology News&Howtos shulou NAV: SLTechnology News&Howtos > Development >
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This article focuses on "analyzing the change tracking function of Oracle blocks". Interested friends may wish to have a look. The method introduced in this paper is simple, fast and practical. Next, let the editor take you to learn the "Analysis of Oracle Block change tracking function"!
Block modification tracking is the process of using binaries to record database changes in a database.
The goal is to improve the performance of incremental backup operations because RMAN can use the fast modification trace file to find blocks that have been modified since the last backup operation. This saves a lot of time, because if you don't, RMAN must scan all blocks to determine which blocks have been modified since the last backup operation.
Here are the steps to enable the quick change tracking feature:
If this feature is not already enabled, you can set the DB_CREATE_FILE_DEST parameter to a directory on disk, for example:
Alter system set db_create_file_dest='/u01/bct' scope=both
The ALTER DATABASE command enables the fast modification tracking feature:
Alter database enable block change tracking
The above example creates a file with the OMF format name in the directory set by the DB_CREATE_FILE_DEST parameter. The name of the file created by this example is as follows:
/ u01/bct/changetracking/o1_mf_8h0wmng1_.chg
You can also enable fast change tracking by directly setting the file name, without setting the DB_CREATE_FILE_DEST parameter, for example:
Alter database enable block change tracking using file'/ u01max bctbind bct.bt'
Run the following query command to view the details of the quick change trace:
Select * from v$block_change_tracking
In order to make the planning space practical, the size of the fast modification tracking file should be set to 1max 30000 of the total size of the tracked data block in the database. Therefore, the size of the quick modification trace file depends on the size of the database, not on the number of trace logs generated.
To disable the quick modification feature, run the following command:
Alter database disable block change tracking; so far, I believe you have a deeper understanding of the "analysis of Oracle block change tracking function", might as well come to the actual operation! Here is the website, more related content can enter the relevant channels to inquire, follow us, continue to learn!
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