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Overview
Comment: | Add the "index_usage" utility program. |
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Downloads: | Tarball | ZIP archive |
Timelines: | family | ancestors | descendants | both | trunk |
Files: | files | file ages | folders |
SHA3-256: |
df95455213c9d1db7229e94217e78edc |
User & Date: | drh 2018-12-04 16:51:42.708 |
Context
2018-12-05
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13:39 | Enhance the sqlite3_normalize_sql() interface so that it works even if the prepared statement was not initially compiled using SQLITE_PREPARE_NORMALIZED. Enhance the ".trace" command in the CLI so that it is able to access the full scope of functionality provided by sqlite3_trace_v2() and in particular so that it is able to show normalized SQL output using the newly enhanced sqlite3_normalize_sql() interface. (check-in: 7da617e97e user: drh tags: trunk) | |
2018-12-04
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21:16 | When compiled with SQLITE_ENABLE_NORMALIZE, always have sqlite3_exec() enable the SQLITE_PREPARE_NORMALIZE flag. (Leaf check-in: 28643d837d user: mistachkin tags: execWithNormalize) | |
16:51 | Add the "index_usage" utility program. (check-in: df95455213 user: drh tags: trunk) | |
14:33 | Performance improvement in sqlite3_step() by creating a new mTrace flag for the legacy xProfile pointer that is set by sqlite3_profile(). (check-in: e28584e8bc user: drh tags: trunk) | |
Changes
Changes to Makefile.in.
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1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 | showwal$(TEXE): $(TOP)/tool/showwal.c sqlite3.lo $(LTLINK) -o $@ $(TOP)/tool/showwal.c sqlite3.lo $(TLIBS) showshm$(TEXE): $(TOP)/tool/showshm.c $(LTLINK) -o $@ $(TOP)/tool/showshm.c changeset$(TEXE): $(TOP)/ext/session/changeset.c sqlite3.lo $(LTLINK) -o $@ $(TOP)/ext/session/changeset.c sqlite3.lo $(TLIBS) changesetfuzz$(TEXE): $(TOP)/ext/session/changesetfuzz.c sqlite3.lo $(LTLINK) -o $@ $(TOP)/ext/session/changesetfuzz.c sqlite3.lo $(TLIBS) rollback-test$(TEXE): $(TOP)/tool/rollback-test.c sqlite3.lo | > > > | 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 | showwal$(TEXE): $(TOP)/tool/showwal.c sqlite3.lo $(LTLINK) -o $@ $(TOP)/tool/showwal.c sqlite3.lo $(TLIBS) showshm$(TEXE): $(TOP)/tool/showshm.c $(LTLINK) -o $@ $(TOP)/tool/showshm.c index_usage$(TEXE): $(TOP)/tool/index_usage.c sqlite3.lo $(LTLINK) -o $@ $(TOP)/tool/index_usage.c sqlite3.lo $(TLIBS) changeset$(TEXE): $(TOP)/ext/session/changeset.c sqlite3.lo $(LTLINK) -o $@ $(TOP)/ext/session/changeset.c sqlite3.lo $(TLIBS) changesetfuzz$(TEXE): $(TOP)/ext/session/changesetfuzz.c sqlite3.lo $(LTLINK) -o $@ $(TOP)/ext/session/changesetfuzz.c sqlite3.lo $(TLIBS) rollback-test$(TEXE): $(TOP)/tool/rollback-test.c sqlite3.lo |
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Changes to Makefile.msc.
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2440 2441 2442 2443 2444 2445 2446 2447 2448 2449 2450 2451 2452 2453 | showwal.exe: $(TOP)\tool\showwal.c $(SQLITE3C) $(SQLITE3H) $(LTLINK) $(NO_WARN) -DSQLITE_THREADSAFE=0 -DSQLITE_OMIT_LOAD_EXTENSION \ $(TOP)\tool\showwal.c $(SQLITE3C) /link $(LDFLAGS) $(LTLINKOPTS) showshm.exe: $(TOP)\tool\showshm.c $(LTLINK) $(NO_WARN) $(TOP)\tool\showshm.c /link $(LDFLAGS) $(LTLINKOPTS) changeset.exe: $(TOP)\ext\session\changeset.c $(SQLITE3C) $(SQLITE3H) $(LTLINK) $(NO_WARN) -DSQLITE_THREADSAFE=0 -DSQLITE_OMIT_LOAD_EXTENSION \ -DSQLITE_ENABLE_SESSION=1 -DSQLITE_ENABLE_PREUPDATE_HOOK=1 \ $(TOP)\ext\session\changeset.c $(SQLITE3C) /link $(LDFLAGS) $(LTLINKOPTS) changesetfuzz.exe: $(TOP)\ext\session\changesetfuzz.c $(SQLITE3C) $(SQLITE3H) $(LTLINK) $(NO_WARN) -DSQLITE_THREADSAFE=0 -DSQLITE_OMIT_LOAD_EXTENSION \ | > > > > | 2440 2441 2442 2443 2444 2445 2446 2447 2448 2449 2450 2451 2452 2453 2454 2455 2456 2457 | showwal.exe: $(TOP)\tool\showwal.c $(SQLITE3C) $(SQLITE3H) $(LTLINK) $(NO_WARN) -DSQLITE_THREADSAFE=0 -DSQLITE_OMIT_LOAD_EXTENSION \ $(TOP)\tool\showwal.c $(SQLITE3C) /link $(LDFLAGS) $(LTLINKOPTS) showshm.exe: $(TOP)\tool\showshm.c $(LTLINK) $(NO_WARN) $(TOP)\tool\showshm.c /link $(LDFLAGS) $(LTLINKOPTS) index_usage.exe: $(TOP)\tool\index_usage.c $(SQLITE3C) $(SQLITE3H) $(LTLINK) $(NO_WARN) -DSQLITE_THREADSAFE=0 -DSQLITE_OMIT_LOAD_EXTENSION \ $(TOP)\tool\index_usage.c $(SQLITE3C) /link $(LDFLAGS) $(LTLINKOPTS) changeset.exe: $(TOP)\ext\session\changeset.c $(SQLITE3C) $(SQLITE3H) $(LTLINK) $(NO_WARN) -DSQLITE_THREADSAFE=0 -DSQLITE_OMIT_LOAD_EXTENSION \ -DSQLITE_ENABLE_SESSION=1 -DSQLITE_ENABLE_PREUPDATE_HOOK=1 \ $(TOP)\ext\session\changeset.c $(SQLITE3C) /link $(LDFLAGS) $(LTLINKOPTS) changesetfuzz.exe: $(TOP)\ext\session\changesetfuzz.c $(SQLITE3C) $(SQLITE3H) $(LTLINK) $(NO_WARN) -DSQLITE_THREADSAFE=0 -DSQLITE_OMIT_LOAD_EXTENSION \ |
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Changes to main.mk.
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990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 | showwal$(EXE): $(TOP)/tool/showwal.c sqlite3.o $(TCC) -DSQLITE_THREADSAFE=0 -DSQLITE_OMIT_LOAD_EXTENSION -o showwal$(EXE) \ $(TOP)/tool/showwal.c sqlite3.o $(THREADLIB) showshm$(EXE): $(TOP)/tool/showshm.c $(TCC) -o showshm$(EXE) $(TOP)/tool/showshm.c changeset$(EXE): $(TOP)/ext/session/changeset.c sqlite3.o $(TCC) -DSQLITE_THREADSAFE=0 -DSQLITE_OMIT_LOAD_EXTENSION -o changeset$(EXE) \ $(TOP)/ext/session/changeset.c sqlite3.o $(THREADLIB) changesetfuzz$(EXE): $(TOP)/ext/session/changesetfuzz.c sqlite3.o $(TCC) -DSQLITE_THREADSAFE=0 -DSQLITE_OMIT_LOAD_EXTENSION -o changesetfuzz$(EXE) \ | > > > > | 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 | showwal$(EXE): $(TOP)/tool/showwal.c sqlite3.o $(TCC) -DSQLITE_THREADSAFE=0 -DSQLITE_OMIT_LOAD_EXTENSION -o showwal$(EXE) \ $(TOP)/tool/showwal.c sqlite3.o $(THREADLIB) showshm$(EXE): $(TOP)/tool/showshm.c $(TCC) -o showshm$(EXE) $(TOP)/tool/showshm.c index_usage$(EXE): $(TOP)/tool/index_usage.c sqlite3.o $(TCC) -DSQLITE_THREADSAFE=0 -DSQLITE_OMIT_DEPRECATED -o index_usage$(EXE) \ $(TOP)/tool/index_usage.c sqlite3.o $(THREADLIB) changeset$(EXE): $(TOP)/ext/session/changeset.c sqlite3.o $(TCC) -DSQLITE_THREADSAFE=0 -DSQLITE_OMIT_LOAD_EXTENSION -o changeset$(EXE) \ $(TOP)/ext/session/changeset.c sqlite3.o $(THREADLIB) changesetfuzz$(EXE): $(TOP)/ext/session/changesetfuzz.c sqlite3.o $(TCC) -DSQLITE_THREADSAFE=0 -DSQLITE_OMIT_LOAD_EXTENSION -o changesetfuzz$(EXE) \ |
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Added tool/index_usage.c.
> > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 | /* ** 2018-12-04 ** ** The author disclaims copyright to this source code. In place of ** a legal notice, here is a blessing: ** ** May you do good and not evil. ** May you find forgiveness for yourself and forgive others. ** May you share freely, never taking more than you give. ** ************************************************************************* ** ** This file implements a utility program used to help determine which ** indexes in a database schema are used and unused, and how often specific ** indexes are used. */ #include "sqlite3.h" #include <stdio.h> #include <stdlib.h> #include <assert.h> #include <string.h> static void usage(const char *argv0){ printf("Usage: %s DATABASE LOG\n\n", argv0); printf( "DATABASE is an SQLite database against which various statements\n" "have been run. The SQL text is stored in LOG. LOG is an SQLite\n" "database with this schema:\n" "\n" " CREATE TABLE sqllog(sql TEXT);\n" "\n" "This utility program analyzes statements contained in LOG and prints\n" "a report showing how many times each index in DATABASE is used by the\n" "statements in LOG.\n" "\n" "DATABASE only needs to contain the schema used by the statements in\n" "LOG. The content can be removed from DATABASE.\n" ); printf("\nAnalysis will be done by SQLite version %s dated %.20s\n" "checkin number %.40s. Different versions\n" "of SQLite might use different indexes.\n", sqlite3_libversion(), sqlite3_sourceid(), sqlite3_sourceid()+21); exit(1); } int main(int argc, char **argv){ sqlite3 *db = 0; /* The main database */ sqlite3_stmt *pStmt = 0; /* a query */ char *zSql; int nErr = 0; int rc; if( argc!=3 ) usage(argv[0]); rc = sqlite3_open_v2(argv[1], &db, SQLITE_OPEN_READONLY, 0); if( rc ){ printf("Cannot open \"%s\" for reading: %s\n", argv[1], sqlite3_errmsg(db)); goto errorOut; } rc = sqlite3_prepare_v2(db, "SELECT * FROM sqlite_master", -1, &pStmt, 0); if( rc ){ printf("Cannot read the schema from \"%s\" - %s\n", argv[1], sqlite3_errmsg(db)); goto errorOut; } sqlite3_finalize(pStmt); pStmt = 0; rc = sqlite3_exec(db, "CREATE TABLE temp.idxu(\n" " tbl TEXT,\n" " idx TEXT,\n" " cnt INT,\n" " PRIMARY KEY(idx)\n" ") WITHOUT ROWID;", 0, 0, 0); if( rc ){ printf("Cannot create the result table - %s\n", sqlite3_errmsg(db)); goto errorOut; } rc = sqlite3_exec(db, "INSERT INTO temp.idxu(tbl,idx,cnt)" " SELECT tbl_name, name, 0 FROM sqlite_master" " WHERE type='index' AND sql IS NOT NULL", 0, 0, 0); /* Open the LOG database */ zSql = sqlite3_mprintf("ATTACH %Q AS log", argv[2]); rc = sqlite3_exec(db, zSql, 0, 0, 0); sqlite3_free(zSql); if( rc ){ printf("Cannot open the LOG database \"%s\" - %s\n", argv[2], sqlite3_errmsg(db)); goto errorOut; } rc = sqlite3_prepare_v2(db, "SELECT sql, rowid FROM log.sqllog", -1, &pStmt, 0); if( rc ){ printf("Cannot read the SQLLOG table in the LOG database \"%s\" - %s\n", argv[2], sqlite3_errmsg(db)); goto errorOut; } /* Update the counts based on LOG */ while( sqlite3_step(pStmt)==SQLITE_ROW ){ const char *zLog = (const char*)sqlite3_column_text(pStmt, 0); sqlite3_stmt *pS2; if( zLog==0 ) continue; zSql = sqlite3_mprintf("EXPLAIN QUERY PLAN %s", zLog); rc = sqlite3_prepare_v2(db, zSql, -1, &pS2, 0); sqlite3_free(zSql); if( rc ){ printf("Cannot compile LOG entry %d (%s): %s\n", sqlite3_column_int(pStmt, 1), zLog, sqlite3_errmsg(db)); nErr++; }else{ while( sqlite3_step(pS2)==SQLITE_ROW ){ const char *zExplain = (const char*)sqlite3_column_text(pS2,3); const char *z1, *z2; int n; /* printf("EXPLAIN: %s\n", zExplain); */ z1 = strstr(zExplain, " USING INDEX "); if( z1==0 ) continue; z1 += 13; for(z2=z1+1; z2[1] && z2[1]!='('; z2++){} n = z2 - z1; zSql = sqlite3_mprintf( "UPDATE temp.idxu SET cnt=cnt+1 WHERE idx='%.*q'", n, z1 ); /* printf("sql: %s\n", zSql); */ sqlite3_exec(db, zSql, 0, 0, 0); sqlite3_free(zSql); } } sqlite3_finalize(pS2); } sqlite3_finalize(pStmt); /* Generate the report */ rc = sqlite3_prepare_v2(db, "SELECT tbl, idx, cnt, " " (SELECT group_concat(name,',') FROM pragma_index_info(idx))" " FROM temp.idxu, main.sqlite_master" " WHERE temp.idxu.tbl=main.sqlite_master.tbl_name" " AND temp.idxu.idx=main.sqlite_master.name" " ORDER BY cnt DESC, tbl, idx", -1, &pStmt, 0); if( rc ){ printf("Cannot query the result table - %s\n", sqlite3_errmsg(db)); goto errorOut; } while( sqlite3_step(pStmt)==SQLITE_ROW ){ printf("%10d %s on %s(%s)\n", sqlite3_column_int(pStmt, 2), sqlite3_column_text(pStmt, 1), sqlite3_column_text(pStmt, 0), sqlite3_column_text(pStmt, 3)); } sqlite3_finalize(pStmt); pStmt = 0; errorOut: sqlite3_finalize(pStmt); sqlite3_close(db); return nErr; } |