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Change the default_cache_size pragma to always store a positive value.

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FossilOrigin-Name: 36fb2cae75b5dfe1fe818895f03c0b4f4190a722
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drh
2010-04-26 17:36:35 +00:00
parent c6d2b4a365
commit 93791ea0ba
3 changed files with 15 additions and 19 deletions
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14
src/pragma.c
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@@ -329,11 +329,11 @@ void sqlite3Pragma(
** page cache size value and the persistent page cache size value
** stored in the database file.
**
** The default cache size is stored in meta-value 2 of page 1 of the
** database file. The cache size is actually the absolute value of
** this memory location. The sign of meta-value 2 determines the
** synchronous setting. A negative value means synchronous is off
** and a positive value means synchronous is on.
** Older versions of SQLite would set the default cache size to a
** negative number to indicate synchronous=OFF. These days, synchronous
** is always on by default regardless of the sign of the default cache
** size. But continue to take the absolute value of the default cache
** size of historical compatibility.
*/
if( sqlite3StrICmp(zLeft,"default_cache_size")==0 ){
static const VdbeOpList getCacheSize[] = {
@@ -362,10 +362,6 @@ void sqlite3Pragma(
if( size<0 ) size = -size;
sqlite3BeginWriteOperation(pParse, 0, iDb);
sqlite3VdbeAddOp2(v, OP_Integer, size, 1);
sqlite3VdbeAddOp3(v, OP_ReadCookie, iDb, 2, BTREE_DEFAULT_CACHE_SIZE);
addr = sqlite3VdbeAddOp2(v, OP_IfPos, 2, 0);
sqlite3VdbeAddOp2(v, OP_Integer, -size, 1);
sqlite3VdbeJumpHere(v, addr);
sqlite3VdbeAddOp3(v, OP_SetCookie, iDb, BTREE_DEFAULT_CACHE_SIZE, 1);
pDb->pSchema->cache_size = size;
sqlite3BtreeSetCacheSize(pDb->pBt, pDb->pSchema->cache_size);