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Add the SQLITE_DB_STATUS_CACHE_HIT and MISS options. For querying the number of cache hits and misses on a per-connection basis.

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FossilOrigin-Name: 5100b6e9dc5107f0f835d0aac26fe6d4938ffc73
This commit is contained in:
dan
2011-09-22 14:41:16 +00:00
parent 0fe0c466ca
commit 58ca31c905
8 changed files with 160 additions and 20 deletions
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22
src/status.c
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@@ -218,6 +218,28 @@ int sqlite3_db_status(
break;
}
/*
** Set *pCurrent to the total cache hits or misses encountered by all
** pagers the database handle is connected to. *pHighwater is always set
** to zero.
*/
case SQLITE_DBSTATUS_CACHE_HIT:
case SQLITE_DBSTATUS_CACHE_MISS: {
int i;
int nRet = 0;
assert( SQLITE_DBSTATUS_CACHE_MISS==SQLITE_DBSTATUS_CACHE_HIT+1 );
for(i=0; i<db->nDb; i++){
if( db->aDb[i].pBt ){
Pager *pPager = sqlite3BtreePager(db->aDb[i].pBt);
sqlite3PagerCacheStat(pPager, op, resetFlag, &nRet);
}
}
*pHighwater = 0;
*pCurrent = nRet;
break;
}
default: {
rc = SQLITE_ERROR;
}