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Overview
| Comment: | Enhance faststat1.c to deal better with WITHOUT ROWID tables. |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | est_count_pragma |
| Files: | files | file ages | folders |
| SHA1: |
65444f2e35cfd51ece1ba6e37b39d181 |
| User & Date: | drh 2016-10-25 18:28:29 |
Context
|
2016-10-25
| ||
| 19:21 | Further refinements to the faststat1.c utility. (check-in: b051fd19 user: drh tags: est_count_pragma) | |
| 18:28 | Enhance faststat1.c to deal better with WITHOUT ROWID tables. (check-in: 65444f2e user: drh tags: est_count_pragma) | |
| 17:28 | Merge recent trunk changes, and especially the PRAGMA index_info enhancement which is needed on this branch. (check-in: c3570e46 user: drh tags: est_count_pragma) | |
Changes
Changes to tool/faststat1.c.
115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 ... 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 ... 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 ... 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 ... 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 |
n++;
}
sqlite3_finalize(pStmt);
}
return n==0 ? 0 : (sqlite3_int64)(sum/n);
}
/*
** Stat1 for a table.
*/
static void analyzeTable(const char *zTab){
sqlite3_int64 n = estEntryCount(zTab);
sqlite3_stmt *pStmt;
if( n==0 ){
printf("-- empty table: %s\n", zTab);
return;
}
pStmt = db_prepare(
"INSERT INTO temp.est_stat1(tbl,idx,stat)"
"VALUES(\"%w\",NULL,'%lld')", zTab, n
);
sqlite3_step(pStmt);
sqlite3_finalize(pStmt);
}
/*
** Compare the i-th column of pStmt against pValue. Return true if they
** are different.
*/
static int columnNotEqual(sqlite3_stmt *pStmt, int i, sqlite3_value *pValue){
int n1, n2, n;
if( sqlite3_column_type(pStmt,i)!=sqlite3_value_type(pValue) ) return 1;
................................................................................
return n1!=n2;
}
return 1;
}
/*
** Stat1 for an index;
*/
static void analyzeIndex(const char *zTab, const char *zIdx){
sqlite3_int64 n = estEntryCount(zIdx);
sqlite3_stmt *pStmt;
sqlite3_uint64 *aCnt;
sqlite3_value **apValue;
int nCol = 0;
int nByte;
int i, j, k;
................................................................................
int iLimit;
int nRow = 0;
char *zRes;
int szRes;
int rc;
# define N_SPAN 5
if( n==0 ) return;
pStmt = db_prepare("PRAGMA index_xinfo=\"%w\"", zIdx);
while( sqlite3_step(pStmt)==SQLITE_ROW ){
const char *zColl = (const char*)sqlite3_column_text(pStmt,4);
if( sqlite3_stricmp(zColl,"binary")!=0 ){
printf("-- cannot analyze index \"%s\" because column \"%s\" uses"
" collating sequence \"%s\".\n",
zIdx, sqlite3_column_text(pStmt, 2), zColl);
sqlite3_finalize(pStmt);
return;
}
if( sqlite3_column_int(pStmt, 5)==0 ) break;
nCol++;
}
sqlite3_finalize(pStmt);
nByte = (sizeof(aCnt[0]) + sizeof(apValue[0]))*nCol + 30*(nCol+1);
aCnt = sqlite3_malloc( nByte );
if( aCnt==0 ){
runtimeError("out of memory");
}
memset(aCnt, 0, nByte);
apValue = (sqlite3_value**)&aCnt[nCol];
................................................................................
pStmt = db_prepare("PRAGMA btree_sample(\"%w\",%g,%lld)",
zIdx, ((double)i)/(double)N_SPAN, n*2);
}
for(j=0; j<nCol; j++) sqlite3_value_free(apValue[j]);
sqlite3_snprintf(szRes, zRes, "%lld", n);
k = (int)strlen(zRes);
for(j=0; j<nCol; j++){
sqlite3_snprintf(szRes-k, zRes+k, " %d", nRow/aCnt[j]);
k += (int)strlen(zRes+k);
}
pStmt = db_prepare(
"INSERT INTO temp.est_stat1(tbl,idx,stat)"
"VALUES(\"%w\",\"%w\",'%s')", zTab, zIdx, zRes
);
sqlite3_step(pStmt);
sqlite3_finalize(pStmt);
}
/*
** Print the sqlite3_value X as an SQL literal.
*/
static void printQuoted(FILE *out, sqlite3_value *X){
switch( sqlite3_value_type(X) ){
case SQLITE_FLOAT: {
................................................................................
cmdlineError("\"%s\" does not appear to be a valid SQLite database", zDb);
}
rc = sqlite3_exec(g.db, "CREATE TEMP TABLE est_stat1(tbl,idx,stat);",
0, 0, &zErrMsg);
if( rc || zErrMsg ){
cmdlineError("Cannot CREATE TEMP TABLE");
}
pStmt = db_prepare("SELECT type, name, tbl_name FROM sqlite_master"
" WHERE type IN ('table','index')"
" AND rootpage>0"
" AND (type='index' OR name NOT LIKE 'sqlite_%%')"
" ORDER BY tbl_name, type DESC, name");
while( sqlite3_step(pStmt)==SQLITE_ROW ){
const char *zType = (const char*)sqlite3_column_text(pStmt, 0);
const char *zName = (const char*)sqlite3_column_text(pStmt, 1);
const char *zTblName = (const char*)sqlite3_column_text(pStmt, 2);
if( zType[0]=='t' ){
analyzeTable(zName);
}else{
analyzeIndex(zTblName, zName);
}
}
sqlite3_finalize(pStmt);
dump_table("temp.est_stat1","sqlite_stat1");
sqlite3_close(g.db);
return 0;
}
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n++;
}
sqlite3_finalize(pStmt);
}
return n==0 ? 0 : (sqlite3_int64)(sum/n);
}
/*
** Compare the i-th column of pStmt against pValue. Return true if they
** are different.
*/
static int columnNotEqual(sqlite3_stmt *pStmt, int i, sqlite3_value *pValue){
int n1, n2, n;
if( sqlite3_column_type(pStmt,i)!=sqlite3_value_type(pValue) ) return 1;
................................................................................
return n1!=n2;
}
return 1;
}
/*
** Stat1 for an index. Return non-zero if an entry was created.
*/
static int analyzeIndex(const char *zTab, const char *zIdx){
sqlite3_int64 n = estEntryCount(zIdx);
sqlite3_stmt *pStmt;
sqlite3_uint64 *aCnt;
sqlite3_value **apValue;
int nCol = 0;
int nByte;
int i, j, k;
................................................................................
int iLimit;
int nRow = 0;
char *zRes;
int szRes;
int rc;
# define N_SPAN 5
if( n==0 ) return 0;
pStmt = db_prepare("PRAGMA index_xinfo=\"%w\"", zIdx);
while( sqlite3_step(pStmt)==SQLITE_ROW ){
const char *zColl = (const char*)sqlite3_column_text(pStmt,4);
if( sqlite3_stricmp(zColl,"binary")!=0 ){
printf("-- cannot analyze index \"%s\" because column \"%s\" uses"
" collating sequence \"%s\".\n",
zIdx, sqlite3_column_text(pStmt, 2), zColl);
sqlite3_finalize(pStmt);
return 0;
}
if( sqlite3_column_int(pStmt, 5)==0 ) break;
nCol++;
}
sqlite3_finalize(pStmt);
if( nCol==0 ) return 0;
nByte = (sizeof(aCnt[0]) + sizeof(apValue[0]))*nCol + 30*(nCol+1);
aCnt = sqlite3_malloc( nByte );
if( aCnt==0 ){
runtimeError("out of memory");
}
memset(aCnt, 0, nByte);
apValue = (sqlite3_value**)&aCnt[nCol];
................................................................................
pStmt = db_prepare("PRAGMA btree_sample(\"%w\",%g,%lld)",
zIdx, ((double)i)/(double)N_SPAN, n*2);
}
for(j=0; j<nCol; j++) sqlite3_value_free(apValue[j]);
sqlite3_snprintf(szRes, zRes, "%lld", n);
k = (int)strlen(zRes);
for(j=0; j<nCol; j++){
sqlite3_snprintf(szRes-k, zRes+k, " %d", (nRow+aCnt[j]-1)/aCnt[j]);
k += (int)strlen(zRes+k);
}
pStmt = db_prepare(
"INSERT INTO temp.est_stat1(tbl,idx,stat)"
"VALUES(\"%w\",\"%w\",'%s')", zTab, zIdx, zRes
);
sqlite3_step(pStmt);
sqlite3_finalize(pStmt);
return 1;
}
/*
** Stat1 for a table.
*/
static void analyzeTable(const char *zTab){
sqlite3_int64 n = estEntryCount(zTab);
sqlite3_stmt *pStmt;
int nIndex = 0;
int isWithoutRowid = 0;
if( n==0 ){
printf("-- empty table: %s\n", zTab);
return;
}
if( analyzeIndex(zTab,zTab) ){
isWithoutRowid = 1;
nIndex++;
}
pStmt = db_prepare("PRAGMA index_list(\"%w\")", zTab);
while( sqlite3_step(pStmt)==SQLITE_ROW ){
if( sqlite3_column_text(pStmt,3)[0]=='p' && isWithoutRowid ) continue;
if( sqlite3_column_int(pStmt,4)==0 ) nIndex++;
analyzeIndex(zTab, (const char*)sqlite3_column_text(pStmt,1));
}
sqlite3_finalize(pStmt);
if( nIndex==0 ){
pStmt = db_prepare(
"INSERT INTO temp.est_stat1(tbl,idx,stat)"
"VALUES(\"%w\",NULL,'%lld')", zTab, n
);
sqlite3_step(pStmt);
sqlite3_finalize(pStmt);
}
}
/*
** Print the sqlite3_value X as an SQL literal.
*/
static void printQuoted(FILE *out, sqlite3_value *X){
switch( sqlite3_value_type(X) ){
case SQLITE_FLOAT: {
................................................................................
cmdlineError("\"%s\" does not appear to be a valid SQLite database", zDb);
}
rc = sqlite3_exec(g.db, "CREATE TEMP TABLE est_stat1(tbl,idx,stat);",
0, 0, &zErrMsg);
if( rc || zErrMsg ){
cmdlineError("Cannot CREATE TEMP TABLE");
}
pStmt = db_prepare("SELECT name FROM sqlite_master"
" WHERE type='table' AND rootpage>0"
" AND name NOT LIKE 'sqlite_%%'"
" ORDER BY name");
while( sqlite3_step(pStmt)==SQLITE_ROW ){
const char *zName = (const char*)sqlite3_column_text(pStmt, 0);
analyzeTable(zName);
}
sqlite3_finalize(pStmt);
dump_table("temp.est_stat1","sqlite_stat1");
sqlite3_close(g.db);
return 0;
}
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