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A negative value N for the cache_size pragma adjusts the number of cache

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pages to use approximately N kibibytes of memory.

FossilOrigin-Name: b3faa680aedc94ed8aa2819228c0d304b181cc51
This commit is contained in:
drh
2011-11-09 14:23:04 +00:00
parent 6a8ab6d9cb
commit 3b42abb35b
5 changed files with 36 additions and 27 deletions
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15
src/pragma.c
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@@ -684,14 +684,11 @@ void sqlite3Pragma(
** PRAGMA [database.]cache_size=N
**
** The first form reports the current local setting for the
** page cache size. The local setting can be different from
** the persistent cache size value that is stored in the database
** file itself. The value returned is the maximum number of
** pages in the page cache. The second form sets the local
** page cache size value. It does not change the persistent
** cache size stored on the disk so the cache size will revert
** to its default value when the database is closed and reopened.
** N should be a positive integer.
** page cache size. The second form sets the local
** page cache size value. If N is positive then that is the
** number of pages in the cache. If N is negative, then the
** number of pages is adjusted so that the cache uses -N kibibytes
** of memory.
*/
if( sqlite3StrICmp(zLeft,"cache_size")==0 ){
if( sqlite3ReadSchema(pParse) ) goto pragma_out;
@@ -699,7 +696,7 @@ void sqlite3Pragma(
if( !zRight ){
returnSingleInt(pParse, "cache_size", pDb->pSchema->cache_size);
}else{
int size = sqlite3AbsInt32(sqlite3Atoi(zRight));
int size = sqlite3Atoi(zRight);
pDb->pSchema->cache_size = size;
sqlite3BtreeSetCacheSize(pDb->pBt, pDb->pSchema->cache_size);
}