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Add the SQLITE_FCNTL_SIZE_HINT operator to sqlite3_file_control() and use it

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to give the VFS hints about the ultimate size of a database file when the
file is growing.

FossilOrigin-Name: 2b7e3b4a30d6a7c4a8a4b8e7dd2ed728b565c96d
This commit is contained in:
drh
2010-05-19 19:26:05 +00:00
parent 4c1cb6ab05
commit 9ff27ecdb2
5 changed files with 34 additions and 12 deletions
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8
src/sqlite.h.in
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@@ -678,11 +678,19 @@ struct sqlite3_io_methods {
** into an integer that the pArg argument points to. This capability
** is used during testing and only needs to be supported when SQLITE_TEST
** is defined.
**
** The [SQLITE_FCNTL_SIZE_HINT] opcode is used by SQLite to give the VFS
** layer a hint of how large the database file will grow to be during the
** current transaction. This hint is not guaranteed to be accurate but it
** is often close. The underlying VFS might choose to preallocate database
** file space based on this hint in order to help writes to the database
** file run faster.
*/
#define SQLITE_FCNTL_LOCKSTATE 1
#define SQLITE_GET_LOCKPROXYFILE 2
#define SQLITE_SET_LOCKPROXYFILE 3
#define SQLITE_LAST_ERRNO 4
#define SQLITE_FCNTL_SIZE_HINT 5
/*
** CAPI3REF: Mutex Handle