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How do I reduce the size of my SQLite database?
a few hints: SQLite is somewhat lazy to reclaim unused space; use the VACUUM command or auto vacuum mode. the datbase format trades space efficiency for speedy access. if you just dump the data contents, either as SQL dump or simply a CVS file for each database table, you’ll likely get smaller files.
Does SQLite compress data?
Both Sqlite and MySql support compressed (and encrypted) databases. Well, more or less. Sqlite’s support is limited to read-only databases that are compressed offline, while MySql’s support is limited to compressing strings (as far as I can tell.)
Who maintains SQLite?
SQLite
| Developer(s) | D. Richard Hipp |
|---|---|
| Repository | www.sqlite.org/src |
| Written in | C |
| Operating system | Cross-platform |
| Size | 699 KiB |
How many connections can SQLite handle?
There is actually no pre-defined limit for number of concurrent connections in sqlite for the same process. This is upto your system’s performance. The quotation given by user647772 is about limit of concurrent processes or applications using the same sqlite DB, not valid for concurrent threads in the same process.
How large is a large database?
The most common definition of VLDB is a database that occupies more than 1 terabyte or contains several billion rows, although naturally this definition changes over time. I think something like wikipedia, or the US census data is a ‘big’ database.
How can I reduce the size of my SQLite database?
Unless SQLite is running in “auto_vacuum=FULL” mode, when a large amount of data is deleted from the database file it leaves behind empty space, or “free” database pages. This means the database file might be larger than strictly necessary. Running VACUUM to rebuild the database reclaims this space and reduces the size of the database file.
How big of a file can SQLite store?
The SQLite documentation states that SQLite databases can be terabytes in size, and that the primary limitation of SQLite is concurrency (many users at the same time). Although we didn’t go this direction (we have our own binary storage format), I was pretty confident that SQLite could handle files of this size.
Why does SQLite use vacuum to rebuild the database?
The VACUUM command rebuilds the entire database. There are several reasons an application might do this: Unless SQLite is running in “auto_vacuum=FULL” mode, when a large amount of data is deleted from the database file it leaves behind empty space, or “free” database pages. This means the database file might be larger than strictly necessary.
How big is the Delta column in SQLite?
A datetime_delta column, storing the difference from the last row with a filled datetime column. SQLite stores integer values individually into 2-9 bytes (incl. one storage mode byte), depending on their value.