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## SQLite C Interface

## Status Parameters

>     #define SQLITE_STATUS_MEMORY_USED          0
>     #define SQLITE_STATUS_PAGECACHE_USED       1
>     #define SQLITE_STATUS_PAGECACHE_OVERFLOW   2
>     #define SQLITE_STATUS_SCRATCH_USED         3
>     #define SQLITE_STATUS_SCRATCH_OVERFLOW     4
>     #define SQLITE_STATUS_MALLOC_SIZE          5
>     #define SQLITE_STATUS_PARSER_STACK         6
>     #define SQLITE_STATUS_PAGECACHE_SIZE       7
>     #define SQLITE_STATUS_SCRATCH_SIZE         8

Important: This interface is experimental and is subject to change without notice.

These integer constants designate various run-time status parameters that can be returned by sqlite3_status().

SQLITE_STATUS_MEMORY_USED
  This parameter is the current amount of memory checked out using sqlite3_malloc(), either directly or indirectly. The figure includes calls made to sqlite3_malloc() by the application and internal memory usage by the SQLite library. Scratch memory controlled by SQLITE_CONFIG_SCRATCH and auxiliary page-cache memory controlled by SQLITE_CONFIG_PAGECACHE is not included in this parameter. The amount returned is the sum of the allocation sizes as reported by the xSize method in sqlite3_mem_methods.

SQLITE_STATUS_MALLOC_SIZE
  This parameter records the largest memory allocation request handed to sqlite3_malloc() or sqlite3_realloc() (or their internal equivalents). Only the value returned in the *pHighwater parameter to sqlite3_status() is of interest. The value written into the *pCurrent parameter is undefined.

SQLITE_STATUS_PAGECACHE_USED
  This parameter returns the number of pages used out of the pagecache memory allocator that was configured using SQLITE_CONFIG_PAGECACHE. The value returned is in pages, not in bytes.

SQLITE_STATUS_PAGECACHE_OVERFLOW
  This parameter returns the number of bytes of page cache allocation which could not be statisfied by the SQLITE_CONFIG_PAGECACHE buffer and where forced to overflow to sqlite3_malloc(). The returned value includes allocations that overflowed because they where too large (they were larger than the "sz" parameter to SQLITE_CONFIG_PAGECACHE) and allocations that overflowed because no space was left in the page cache.

SQLITE_STATUS_PAGECACHE_SIZE
  This parameter records the largest memory allocation request handed to pagecache memory allocator. Only the value returned in the *pHighwater parameter to sqlite3_status() is of interest. The value written into the *pCurrent parameter is undefined.

SQLITE_STATUS_SCRATCH_USED
  This parameter returns the number of allocations used out of the scratch memory allocator configured using SQLITE_CONFIG_SCRATCH. The value returned is in allocations, not in bytes. Since a single thread may only have one scratch allocation outstanding at time, this parameter also reports the number of threads using scratch memory at the same time.

SQLITE_STATUS_SCRATCH_OVERFLOW
  This parameter returns the number of bytes of scratch memory allocation which could not be statisfied by the SQLITE_CONFIG_SCRATCH buffer and where forced to overflow to sqlite3_malloc(). The values returned include overflows because the requested allocation was too larger (that is, because the requested allocation was larger than the "sz" parameter to SQLITE_CONFIG_SCRATCH) and because no scratch buffer slots were available.

SQLITE_STATUS_SCRATCH_SIZE
  This parameter records the largest memory allocation request handed to scratch memory allocator. Only the value returned in the *pHighwater parameter to sqlite3_status() is of interest. The value written into the *pCurrent parameter is undefined.

SQLITE_STATUS_PARSER_STACK
  This parameter records the deepest parser stack. It is only meaningful if SQLite is compiled with YYTRACKMAXSTACKDEPTH.

New status parameters may be added from time to time.

See also lists of Objects, Constants, and Functions.

This page last modified 2009/08/19 14:11:24 UTC