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Add the SQLITE_DBSTATUS_CACHE_SPILL option to sqlite3_db_status()

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FossilOrigin-Name: 3faeb851374471a6f94a6fab3a62c73d03330eae6fc72cd1a277b03ad12dcdd0
This commit is contained in:
drh
2018-03-14 14:53:50 +00:00
parent 68cf69ed8d
commit ffc78a41ea
8 changed files with 62 additions and 20 deletions
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21
src/pager.c
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@@ -699,7 +699,7 @@ struct Pager {
char *zJournal; /* Name of the journal file */
int (*xBusyHandler)(void*); /* Function to call when busy */
void *pBusyHandlerArg; /* Context argument for xBusyHandler */
int aStat[3]; /* Total cache hits, misses and writes */
int aStat[4]; /* Total cache hits, misses, writes, spills */
#ifdef SQLITE_TEST
int nRead; /* Database pages read */
#endif
@@ -727,6 +727,7 @@ struct Pager {
#define PAGER_STAT_HIT 0
#define PAGER_STAT_MISS 1
#define PAGER_STAT_WRITE 2
#define PAGER_STAT_SPILL 3
/*
** The following global variables hold counters used for
@@ -4618,6 +4619,7 @@ static int pagerStress(void *p, PgHdr *pPg){
return SQLITE_OK;
}
pPager->aStat[PAGER_STAT_SPILL]++;
pPg->pDirty = 0;
if( pagerUseWal(pPager) ){
/* Write a single frame for this page to the log. */
@@ -6738,8 +6740,12 @@ int *sqlite3PagerStats(Pager *pPager){
#endif
/*
** Parameter eStat must be either SQLITE_DBSTATUS_CACHE_HIT or
** SQLITE_DBSTATUS_CACHE_MISS. Before returning, *pnVal is incremented by the
** Parameter eStat must be one of SQLITE_DBSTATUS_CACHE_HIT, _MISS, _WRITE,
** or _WRITE+1. The SQLITE_DBSTATUS_CACHE_WRITE+1 case is a translation
** of SQLITE_DBSTATUS_CACHE_SPILL. The _SPILL case is not contiguous because
** it was added later.
**
** Before returning, *pnVal is incremented by the
** current cache hit or miss count, according to the value of eStat. If the
** reset parameter is non-zero, the cache hit or miss count is zeroed before
** returning.
@@ -6749,15 +6755,18 @@ void sqlite3PagerCacheStat(Pager *pPager, int eStat, int reset, int *pnVal){
assert( eStat==SQLITE_DBSTATUS_CACHE_HIT
|| eStat==SQLITE_DBSTATUS_CACHE_MISS
|| eStat==SQLITE_DBSTATUS_CACHE_WRITE
|| eStat==SQLITE_DBSTATUS_CACHE_WRITE+1
);
assert( SQLITE_DBSTATUS_CACHE_HIT+1==SQLITE_DBSTATUS_CACHE_MISS );
assert( SQLITE_DBSTATUS_CACHE_HIT+2==SQLITE_DBSTATUS_CACHE_WRITE );
assert( PAGER_STAT_HIT==0 && PAGER_STAT_MISS==1 && PAGER_STAT_WRITE==2 );
assert( PAGER_STAT_HIT==0 && PAGER_STAT_MISS==1
&& PAGER_STAT_WRITE==2 && PAGER_STAT_SPILL==3 );
*pnVal += pPager->aStat[eStat - SQLITE_DBSTATUS_CACHE_HIT];
eStat -= SQLITE_DBSTATUS_CACHE_HIT;
*pnVal += pPager->aStat[eStat];
if( reset ){
pPager->aStat[eStat - SQLITE_DBSTATUS_CACHE_HIT] = 0;
pPager->aStat[eStat] = 0;
}
}