To achieve the best long-term query performance without the need to do a detailed engineering analysis of the application schema and SQL, it is recommended that applications run “PRAGMA optimize” (with no arguments) just before closing each . When auto-vacuum is disabled and data is deleted data from a database, the database file remains the same size. PRAGMA schema.Journal_mode; PRAGMA schema.Journal_mode = DELETE . PRAGMA ignore_check_constraints PRAGMA ignore_check_constraints = boolean; This pragma enables or disables the enforcement of CHECK constraints.
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To confirm this action, please enter the title of the story below. The site says to create a filter, but their documentation is horrible and there are no details on this feature. PRAGMA stats; This pragma returns auxiliary information about tables and indices. Current version: 4.7.0 Release date: August 24, 2017 If you are an SQLiteManager version 3 registered user you can upgrade to version 4 for free or for $39.
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If you stop and think about it, it’s really amazing how much power is packed into today’s smart phones. In the database I have a table where iâm storing documents: [dbo].[Documents], user data: [dbo].[Users] and table with relations between documents and users: [dbo].[UserDocuments]. [Dbo].[User Documents] – tells me which document belongs to which user. [Dbo].[Documents] structure: [dbo].[Users] structure [dbo].[UserDocuments] structure Please notice, that in table dbo.User I have a column usrSubscriberId – it tells me exactly which user uses particular subscriber id. PRAGMA schema.Page_size; PRAGMA schema.Page_size = bytes; Query or set the page size of the database. To learn more about the offline sync feature, see the topic .
I have a dbfile on the server but it does not exist yet on the client. How do I copy it down?
PRAGMA vdbe_addoptrace PRAGMA vdbe_addoptrace = boolean; If SQLite has been compiled with the compile-time option, then the vdbe_addoptrace pragma can be used to cause a complete VDBE opcodes to be displayed as they are created during code generation. However, a cache spill has the side-effect of acquiring an on the database file.
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Pros: Cons: For GUID columns, the key will not change on sync, and will not conflict with existing keys. Last step you need to do is to tell SQLite-sync to use the created filter.
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The number of system calls for filesystem operations is reduced, possibly resulting in a small performance increase. When the “end” or “commit” (or “rollback” to cancel the transaction) is encountered, the write lock is released and other operations can resume. The optional MASK argument is a bitmask of optimizations to perform: Debugging mode. The page size must be a power of two between 512 and 65536 inclusive. The name of the result column is a combination of the source table and source column name: TABLE.COLUMN This pragma is deprecated and exists for backwards compatibility only.
PRAGMA vdbe_listing PRAGMA vdbe_listing = boolean; If SQLite has been compiled with the compile-time option, then the vdbe_listing pragma can be used to cause a complete listing of the virtual machine opcodes to appear on standard output as each statement is evaluated. A family of FLEA-inspired CSPRNGs and Stream Ciphers BEDBUG is a small, fast, cryptographically secure pseudo-random number generator (CSPRNG) and stream cipher.