mirror of https://github.com/sqlite/sqlite
Add the "index_usage" utility program.
FossilOrigin-Name: df95455213c9d1db7229e94217e78edc05cbf9e40f39528105494ea6ac52be94
This commit is contained in:
drh
parent
04c6747a80
commit
731dd6ebda
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@ -1306,6 +1306,9 @@ showwal$(TEXE): $(TOP)/tool/showwal.c sqlite3.lo
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showshm$(TEXE): $(TOP)/tool/showshm.c
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$(LTLINK) -o $@ $(TOP)/tool/showshm.c
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index_usage$(TEXE): $(TOP)/tool/index_usage.c sqlite3.lo
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$(LTLINK) -o $@ $(TOP)/tool/index_usage.c sqlite3.lo $(TLIBS)
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changeset$(TEXE): $(TOP)/ext/session/changeset.c sqlite3.lo
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$(LTLINK) -o $@ $(TOP)/ext/session/changeset.c sqlite3.lo $(TLIBS)
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@ -2444,6 +2444,10 @@ showwal.exe: $(TOP)\tool\showwal.c $(SQLITE3C) $(SQLITE3H)
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showshm.exe: $(TOP)\tool\showshm.c
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$(LTLINK) $(NO_WARN) $(TOP)\tool\showshm.c /link $(LDFLAGS) $(LTLINKOPTS)
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index_usage.exe: $(TOP)\tool\index_usage.c $(SQLITE3C) $(SQLITE3H)
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$(LTLINK) $(NO_WARN) -DSQLITE_THREADSAFE=0 -DSQLITE_OMIT_LOAD_EXTENSION \
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$(TOP)\tool\index_usage.c $(SQLITE3C) /link $(LDFLAGS) $(LTLINKOPTS)
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changeset.exe: $(TOP)\ext\session\changeset.c $(SQLITE3C) $(SQLITE3H)
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$(LTLINK) $(NO_WARN) -DSQLITE_THREADSAFE=0 -DSQLITE_OMIT_LOAD_EXTENSION \
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-DSQLITE_ENABLE_SESSION=1 -DSQLITE_ENABLE_PREUPDATE_HOOK=1 \
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4
main.mk
4
main.mk
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@ -995,6 +995,10 @@ showwal$(EXE): $(TOP)/tool/showwal.c sqlite3.o
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showshm$(EXE): $(TOP)/tool/showshm.c
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$(TCC) -o showshm$(EXE) $(TOP)/tool/showshm.c
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index_usage$(EXE): $(TOP)/tool/index_usage.c sqlite3.o
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$(TCC) -DSQLITE_THREADSAFE=0 -DSQLITE_OMIT_DEPRECATED -o index_usage$(EXE) \
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$(TOP)/tool/index_usage.c sqlite3.o $(THREADLIB)
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changeset$(EXE): $(TOP)/ext/session/changeset.c sqlite3.o
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$(TCC) -DSQLITE_THREADSAFE=0 -DSQLITE_OMIT_LOAD_EXTENSION -o changeset$(EXE) \
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$(TOP)/ext/session/changeset.c sqlite3.o $(THREADLIB)
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17
manifest
17
manifest
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@ -1,10 +1,10 @@
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C Performance\simprovement\sin\ssqlite3_step()\sby\screating\sa\snew\smTrace\sflag\nfor\sthe\slegacy\sxProfile\spointer\sthat\sis\sset\sby\ssqlite3_profile().
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D 2018-12-04T14:33:02.434
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C Add\sthe\s"index_usage"\sutility\sprogram.
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D 2018-12-04T16:51:42.708
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F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
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F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
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F Makefile.in a050c8670ea0d7b37b2192306cbb50d392acd9902b84e9b56f3444d006f97a6c
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F Makefile.in 68d0ba0f0b533d5bc84c78c13a6ce84ee81183a67014caa47a969e67f028fa1c
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F Makefile.linux-gcc 7bc79876b875010e8c8f9502eb935ca92aa3c434
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F Makefile.msc 0d6831ff7951b302e888d86d4c469e2ec3c22f59eba4118b8c38d5a51d9e2d4f
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F Makefile.msc b7d4a710fa3f0b8cfc532ff195b85dc1ba2a8ad34343cb3d67639f28f0a24306
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F README.md 377233394b905d3b2e2b33741289e093bc93f2e7adbe00923b2c5958c9a9edee
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F VERSION 654da1d4053fb09ffc33a3910e6d427182a7dcdc67e934fa83de2849ac83fccb
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F aclocal.m4 a5c22d164aff7ed549d53a90fa56d56955281f50
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@ -429,7 +429,7 @@ F ext/userauth/userauth.c f81aa5a3ecacf406f170c62a144405858f6f6de51dbdc0920134e6
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F install-sh 9d4de14ab9fb0facae2f48780b874848cbf2f895 x
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F ltmain.sh 3ff0879076df340d2e23ae905484d8c15d5fdea8
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F magic.txt 8273bf49ba3b0c8559cb2774495390c31fd61c60
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F main.mk eeaa279fa6acdcfa6555058548075569a06f891fd67f5901b1e7700d18052fda
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F main.mk 55f94164ecc194b067d9c55e106f37fd3c9b39f9668e8b568c98f008b6f9ec90
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F mkso.sh fd21c06b063bb16a5d25deea1752c2da6ac3ed83
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F mptest/config01.test 3c6adcbc50b991866855f1977ff172eb6d901271
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F mptest/config02.test 4415dfe36c48785f751e16e32c20b077c28ae504
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@ -1699,6 +1699,7 @@ F tool/fuzzershell.c e1d90a03ca790d7c331c2aae08ca46ff435f1ae1faa6cb9cc48f4687c18
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F tool/genfkey.README cf68fddd4643bbe3ff8e31b8b6d8b0a1b85e20f4
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F tool/genfkey.test b6afd7b825d797a1e1274f519ab5695373552ecad5cd373530c63533638a5a4f
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F tool/getlock.c f4c39b651370156cae979501a7b156bdba50e7ce
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F tool/index_usage.c 8fd515b97522ae4b1aa6ca9847439f005d4cbaf6eb0eb416b694dba77c0263f0
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F tool/kvtest-speed.sh 4761a9c4b3530907562314d7757995787f7aef8f
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F tool/lemon.c c9ba01f6729c892ae3e0f55c8a2d694a7e6ec3dd3aa280b411a008ef69b410cd
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F tool/lempar.c 61af95b8fac2bfd59c09d55330e78f3f5e352d7aa80bf37404b96ef795be3fdc
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@ -1781,7 +1782,7 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
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F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
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F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
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F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
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P 893448265299f4c70c32c8e92ea66f8d33c1c213b21701f73fa3815514cd5ef6
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R 8ed134deac4c27b14c838ed0e6319d34
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P e28584e8bc7b7405380064b60523fa6191f827f74075f6d117eb7732d752ba5e
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R 14a419221d3a581ec01dad82979f03fc
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U drh
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Z 84b5f74d4a6ae62e21d6700a38fd119f
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Z 0158a53fd6ddbd828c2808dfe15d0a38
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@ -1 +1 @@
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e28584e8bc7b7405380064b60523fa6191f827f74075f6d117eb7732d752ba5e
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df95455213c9d1db7229e94217e78edc05cbf9e40f39528105494ea6ac52be94
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@ -0,0 +1,164 @@
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/*
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** 2018-12-04
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**
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** The author disclaims copyright to this source code. In place of
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** a legal notice, here is a blessing:
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**
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** May you do good and not evil.
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** May you find forgiveness for yourself and forgive others.
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** May you share freely, never taking more than you give.
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**
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*************************************************************************
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**
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** This file implements a utility program used to help determine which
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** indexes in a database schema are used and unused, and how often specific
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** indexes are used.
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*/
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#include "sqlite3.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <assert.h>
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#include <string.h>
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static void usage(const char *argv0){
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printf("Usage: %s DATABASE LOG\n\n", argv0);
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printf(
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"DATABASE is an SQLite database against which various statements\n"
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"have been run. The SQL text is stored in LOG. LOG is an SQLite\n"
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"database with this schema:\n"
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"\n"
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" CREATE TABLE sqllog(sql TEXT);\n"
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"\n"
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"This utility program analyzes statements contained in LOG and prints\n"
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"a report showing how many times each index in DATABASE is used by the\n"
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"statements in LOG.\n"
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"\n"
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"DATABASE only needs to contain the schema used by the statements in\n"
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"LOG. The content can be removed from DATABASE.\n"
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);
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printf("\nAnalysis will be done by SQLite version %s dated %.20s\n"
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"checkin number %.40s. Different versions\n"
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"of SQLite might use different indexes.\n",
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sqlite3_libversion(), sqlite3_sourceid(), sqlite3_sourceid()+21);
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exit(1);
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}
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int main(int argc, char **argv){
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sqlite3 *db = 0; /* The main database */
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sqlite3_stmt *pStmt = 0; /* a query */
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char *zSql;
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int nErr = 0;
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int rc;
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if( argc!=3 ) usage(argv[0]);
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rc = sqlite3_open_v2(argv[1], &db, SQLITE_OPEN_READONLY, 0);
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if( rc ){
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printf("Cannot open \"%s\" for reading: %s\n", argv[1], sqlite3_errmsg(db));
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goto errorOut;
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}
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rc = sqlite3_prepare_v2(db, "SELECT * FROM sqlite_master", -1, &pStmt, 0);
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if( rc ){
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printf("Cannot read the schema from \"%s\" - %s\n", argv[1],
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sqlite3_errmsg(db));
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goto errorOut;
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}
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sqlite3_finalize(pStmt);
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pStmt = 0;
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rc = sqlite3_exec(db,
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"CREATE TABLE temp.idxu(\n"
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" tbl TEXT,\n"
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" idx TEXT,\n"
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" cnt INT,\n"
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" PRIMARY KEY(idx)\n"
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") WITHOUT ROWID;", 0, 0, 0);
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if( rc ){
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printf("Cannot create the result table - %s\n",
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sqlite3_errmsg(db));
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goto errorOut;
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}
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rc = sqlite3_exec(db,
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"INSERT INTO temp.idxu(tbl,idx,cnt)"
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" SELECT tbl_name, name, 0 FROM sqlite_master"
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" WHERE type='index' AND sql IS NOT NULL", 0, 0, 0);
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/* Open the LOG database */
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zSql = sqlite3_mprintf("ATTACH %Q AS log", argv[2]);
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rc = sqlite3_exec(db, zSql, 0, 0, 0);
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sqlite3_free(zSql);
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if( rc ){
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printf("Cannot open the LOG database \"%s\" - %s\n",
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argv[2], sqlite3_errmsg(db));
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goto errorOut;
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}
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rc = sqlite3_prepare_v2(db, "SELECT sql, rowid FROM log.sqllog",
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-1, &pStmt, 0);
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if( rc ){
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printf("Cannot read the SQLLOG table in the LOG database \"%s\" - %s\n",
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argv[2], sqlite3_errmsg(db));
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goto errorOut;
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}
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/* Update the counts based on LOG */
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while( sqlite3_step(pStmt)==SQLITE_ROW ){
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const char *zLog = (const char*)sqlite3_column_text(pStmt, 0);
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sqlite3_stmt *pS2;
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if( zLog==0 ) continue;
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zSql = sqlite3_mprintf("EXPLAIN QUERY PLAN %s", zLog);
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rc = sqlite3_prepare_v2(db, zSql, -1, &pS2, 0);
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sqlite3_free(zSql);
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if( rc ){
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printf("Cannot compile LOG entry %d (%s): %s\n",
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sqlite3_column_int(pStmt, 1), zLog, sqlite3_errmsg(db));
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nErr++;
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}else{
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while( sqlite3_step(pS2)==SQLITE_ROW ){
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const char *zExplain = (const char*)sqlite3_column_text(pS2,3);
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const char *z1, *z2;
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int n;
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/* printf("EXPLAIN: %s\n", zExplain); */
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z1 = strstr(zExplain, " USING INDEX ");
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if( z1==0 ) continue;
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z1 += 13;
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for(z2=z1+1; z2[1] && z2[1]!='('; z2++){}
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n = z2 - z1;
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zSql = sqlite3_mprintf(
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"UPDATE temp.idxu SET cnt=cnt+1 WHERE idx='%.*q'", n, z1
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);
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/* printf("sql: %s\n", zSql); */
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sqlite3_exec(db, zSql, 0, 0, 0);
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sqlite3_free(zSql);
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}
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}
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sqlite3_finalize(pS2);
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}
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sqlite3_finalize(pStmt);
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/* Generate the report */
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rc = sqlite3_prepare_v2(db,
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"SELECT tbl, idx, cnt, "
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" (SELECT group_concat(name,',') FROM pragma_index_info(idx))"
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" FROM temp.idxu, main.sqlite_master"
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" WHERE temp.idxu.tbl=main.sqlite_master.tbl_name"
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" AND temp.idxu.idx=main.sqlite_master.name"
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" ORDER BY cnt DESC, tbl, idx",
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-1, &pStmt, 0);
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if( rc ){
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printf("Cannot query the result table - %s\n",
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sqlite3_errmsg(db));
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goto errorOut;
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}
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while( sqlite3_step(pStmt)==SQLITE_ROW ){
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printf("%10d %s on %s(%s)\n",
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sqlite3_column_int(pStmt, 2),
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sqlite3_column_text(pStmt, 1),
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sqlite3_column_text(pStmt, 0),
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sqlite3_column_text(pStmt, 3));
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}
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sqlite3_finalize(pStmt);
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pStmt = 0;
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errorOut:
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sqlite3_finalize(pStmt);
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sqlite3_close(db);
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return nErr;
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}
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