How to free up disk space for the database file

Hi experts BDB.

I use bdb4.6.21 transaction Btree access method, found that after vacuum db db-> truncate, the size of the db file has changed. How to free up disk file db space? It can be configured?

Thank you

Min

Hi Min,

What Mike says is that you do not expect that the empty space after an operation of truncation (for example a delete or update that empties a page) in the database (empty pages) to return to the file system and therefore to see the physical file size decreases.

The next section of the documentation explaining this: required disk space

Space released by removing the key/data pairs in a Btree database or Hash is never returned in the file system, even if it is reused when possible. This means that the databases Btree and hash are to develop alone. If enough key is deleted from a database which shrinks the underlying file is desirable, use the DB-> compact() method to recover disk space. Alternatively, you can create a new database and copy the folders of the former into it.


So, as Mike suggested, you can dump and reload the data into a new database, or copy data from the existing/old database to a new (to remove the old database and rename a new one the old name), or you can try to compact the database using the method compact().

If you use compact(), then in order to force the return of empty for the file system pages when possible, use the DB_FREE_SPACE flag and try to avoid using an explicit transaction (use a NULL tnxid pointer, so this BDB will use internally of several transactions that will be engaged periodically to avoid locking large sections of the tree).

When you use the compaction in order to free up space and return pages from database empty in the file system that it is generally recommended to repeat Compact with a value low 'compact_fillpercent '.  In addition, the following output statistics fields in the structure DB_COMPACT, compact_pages_truncated and compact_pages_free should be examined to determine if there is a point, continuing to run the compaction with the same compact_fillpercent.  If the values are strict positive it is then compact() calling again with the same compact_fillpercent (and specify the DB_FREE_SPACE flag).  The compact algorithm allows a single pass on the pages of the database;  pages so not empty at the end of the file will prevent the free pages (which are placed on the free list) to be returned to the file system.

Kind regards

Andrei

Tags: Database

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