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Overview
| Comment: | Changes the formatting of ".scanstats on" in the shell so that the stats for subqueries are grouped together and occur after the main query. |
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| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | scanstatus |
| Files: | files | file ages | folders |
| SHA1: |
eacbbd8849db9b023eff15ef1cb42ec9 |
| User & Date: | drh 2014-11-06 12:08:21 |
Context
|
2014-11-06
| ||
| 12:17 | On the ".scanstats on" output in the shell, initialize the estimated count for the first loop of each subquery to the actual loop count. (check-in: d1c51c84 user: drh tags: scanstatus) | |
| 12:08 | Changes the formatting of ".scanstats on" in the shell so that the stats for subqueries are grouped together and occur after the main query. (check-in: eacbbd88 user: drh tags: scanstatus) | |
| 04:42 | Add the SQLITE_SCANSTAT_SELECTID metric. Use it to improve the ".stmtscan on" output in the shell. (check-in: 64ad5761 user: drh tags: scanstatus) | |
Changes
Changes to src/shell.c.
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** Display scan stats.
*/
static void display_scanstats(
sqlite3 *db, /* Database to query */
ShellState *pArg /* Pointer to ShellState */
){
#ifdef SQLITE_ENABLE_STMT_SCANSTATUS
int i;
double *arEstLoop = 0;
int nEstLoop = 0;
fprintf(pArg->out, "-------- scanstats --------\n");
for(i=0; 1; i++){
sqlite3_stmt *p = pArg->pStmt;
sqlite3_int64 nLoop, nVisit;
double rEst, rLoop;
int iSid;
const char *zExplain;
if( sqlite3_stmt_scanstatus(p, i, SQLITE_SCANSTAT_NLOOP, (void*)&nLoop) ){
break;
}
sqlite3_stmt_scanstatus(p, i, SQLITE_SCANSTAT_NVISIT, (void*)&nVisit);
sqlite3_stmt_scanstatus(p, i, SQLITE_SCANSTAT_EST, (void*)&rEst);
sqlite3_stmt_scanstatus(p, i, SQLITE_SCANSTAT_EXPLAIN, (void*)&zExplain);
sqlite3_stmt_scanstatus(p, i, SQLITE_SCANSTAT_SELECTID, (void*)&iSid);
if( iSid>=nEstLoop ){
arEstLoop = sqlite3_realloc(arEstLoop, sizeof(arEstLoop[0])*(iSid+1) );
while( nEstLoop<=iSid ) arEstLoop[nEstLoop++] = 1.0;
}
if( iSid>=0 ){
arEstLoop[iSid] *= rEst;
rLoop = arEstLoop[iSid];
}else{
rLoop = rEst;
}
fprintf(pArg->out, "Loop %2d: \"%s\"\n", i, zExplain);
fprintf(pArg->out, " nLoop=%-8lld nRow=%-8lld estRow=%-8lld estRow/Loop=%-8g\n",
nLoop, nVisit, (sqlite3_int64)rLoop, rEst
);
}
sqlite3_free(arEstLoop);
#else
fprintf(pArg->out, "-------- scanstats --------\n");
fprintf(pArg->out,
"sqlite3_stmt_scanstatus() unavailable - "
"rebuild with SQLITE_ENABLE_STMT_SCANSTATUS\n"
);
#endif
|
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** Display scan stats.
*/
static void display_scanstats(
sqlite3 *db, /* Database to query */
ShellState *pArg /* Pointer to ShellState */
){
#ifdef SQLITE_ENABLE_STMT_SCANSTATUS
int i, k, n = 1;
fprintf(pArg->out, "-------- scanstats --------\n");
for(k=0; n>0; k++){
double rEstLoop = 1.0;
for(i=n=0; 1; i++){
sqlite3_stmt *p = pArg->pStmt;
sqlite3_int64 nLoop, nVisit;
double rEst;
int iSid;
const char *zExplain;
if( sqlite3_stmt_scanstatus(p, i, SQLITE_SCANSTAT_NLOOP, (void*)&nLoop) ){
break;
}
sqlite3_stmt_scanstatus(p, i, SQLITE_SCANSTAT_SELECTID, (void*)&iSid);
if( iSid!=k ) continue;
if( n==0 && k>0 ) fprintf(pArg->out, "-------- subquery %d --------\n", k);
n++;
sqlite3_stmt_scanstatus(p, i, SQLITE_SCANSTAT_NVISIT, (void*)&nVisit);
sqlite3_stmt_scanstatus(p, i, SQLITE_SCANSTAT_EST, (void*)&rEst);
sqlite3_stmt_scanstatus(p, i, SQLITE_SCANSTAT_EXPLAIN, (void*)&zExplain);
fprintf(pArg->out, "Loop %2d: %s\n", n, zExplain);
rEstLoop *= rEst;
fprintf(pArg->out, " nLoop=%-8lld nRow=%-8lld estRow=%-8lld estRow/Loop=%-8g\n",
nLoop, nVisit, (sqlite3_int64)rEstLoop, rEst
);
}
}
#else
fprintf(pArg->out, "-------- scanstats --------\n");
fprintf(pArg->out,
"sqlite3_stmt_scanstatus() unavailable - "
"rebuild with SQLITE_ENABLE_STMT_SCANSTATUS\n"
);
#endif
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