When overwriting the original, a rollback journal or write-ahead log WAL file is used just as it would be for any other database transaction. The VACUUM command works by copying the contents of the database into a temporary database file and then overwriting the original with the contents of the temporary file. In some cases, VACUUM may also reduce the number of partially filled pages in the database, reducing the size of the database file further. Running VACUUM ensures that each table and index is largely stored contiguously within the database file. Plus, both Snappy and LZO are fast, yes, but they are not as good as zlib in compression ratio. Change the CPU power or the io system and your compression goals change. Compressed geometry uses lossy compression. There are several reasons an application might do this: Unless SQLite is running in 'autovacuumFULL' mode, when a large amount of data is deleted from the database file it leaves behind empty space, or 'free' database pages. SQLite is a public domain relational database management system contained in a C. Frequent inserts, updates, and deletes can cause the database file to become fragmented - where data for a single table or index is scattered around the database file. Compression is always about balancing io block latency and cpu cycles. The VACUUM command rebuilds the database file, repacking it into a minimal amount of disk space.Running VACUUM to rebuild the database reclaims this space and reduces the size of the database file.
#COMPRESS SQLITE DATABASE PRO#
This means the database file might be larger than strictly necessary. Free sqlite compress download software at UpdateStar - SQLite Pro Enterprise Manager is a freeware tool that enables you to manage your SQLite3 databases.
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