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SQLite training in Houston TX on 2019-11-05 (details)
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Overview
Comment:Add the --progress, --using, and -q options to the index_usage utility program.
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SHA3-256: a5e6be7cbc5d931308ddcc073c9cd6275c9711cae055d72a7c4aa71c1d15914c
User & Date: drh 2019-01-30 15:47:38
Context
2019-01-30
16:58
Fix an off-by-one error when parsing the names of indexes that do not have arguments in the index_usage utility. check-in: dc794d8f user: drh tags: trunk
15:47
Add the --progress, --using, and -q options to the index_usage utility program. check-in: a5e6be7c user: drh tags: trunk
14:01
Enhancements to the index_usage utility program. check-in: 19c739b4 user: drh tags: trunk
Changes
Hide Diffs Unified Diffs Ignore Whitespace Patch

Changes to tool/index_usage.c.

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#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;
  }
................................................................................
           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;
................................................................................
     " WHERE upper(substr(sql,1,5)) NOT IN ('BEGIN','COMMI','ROLLB','PRAGM')",
                          -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 */
................................................................................
       sqlite3_column_text(pStmt, 0),
       sqlite3_column_text(pStmt, 3));
  }
  sqlite3_finalize(pStmt);
  pStmt = 0;

errorOut:

  sqlite3_finalize(pStmt);
  sqlite3_close(db);
  return nErr;
}







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#include "sqlite3.h"
#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
#include <string.h>

static void usage(const char *argv0){
  printf("Usage: %s [OPTIONS] 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(
    "\nOPTIONS:\n\n"
    "    --progress N   Show a progress message after every N input rows\n"
    "    -q             Omit error message when parsing log entries\n"
    "    --using NAME   Print SQL statements that use index NAME\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;
  int bQuiet = 0;
  int i, j;
  const char *zUsing = 0;
  sqlite3_stmt *pIncrCnt = 0;
  int nRow = 0;
  int iProgress = 0;

  for(i=j=1; i<argc; i++){
    const char *z = argv[i];
    if( z[0]=='-' ){
      z++;
      if( z[0]=='-' ) z++;
      if( strcmp(z,"progress")==0 ){
        if( i+1<argc ){
          iProgress = strtol(argv[++i],0,0);
          continue;
        }
        printf("The --progress option requires an argument\n");
        exit(0);
      }
      if( strcmp(z,"q")==0 ){
        bQuiet = 1;
        continue;
      }
      if( strcmp(z,"using")==0 ){
        if( i+1<argc ){
          zUsing = argv[++i];
          continue;
        }
        printf("The --using option requires an argument\n");
        exit(0);
      }
      if( strcmp(z, "help")==0 || strcmp(z, "?")==0 ){
        usage(argv[0]);
      }
      printf("Unknown command-line option: \"%s\"\n", argv[i]);
      exit(0);
    }else{
      if( j<i ) argv[j++] = argv[i];
    }
  }
  argc = j;

  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;
  }
................................................................................
           sqlite3_errmsg(db));
    goto errorOut;
  }
  sqlite3_finalize(pStmt);
  pStmt = 0;
  rc = sqlite3_exec(db, 
     "CREATE TABLE temp.idxu(\n"
     "  tbl TEXT COLLATE nocase,\n"
     "  idx TEXT COLLATE nocase,\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;
................................................................................
     " WHERE upper(substr(sql,1,5)) NOT IN ('BEGIN','COMMI','ROLLB','PRAGM')",
                          -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;
  }

  rc = sqlite3_prepare_v2(db,
    "UPDATE temp.idxu SET cnt=cnt+1 WHERE idx=?1",
    -1, &pIncrCnt, 0);
  if( rc ){
    printf("Cannot prepare a statement to increment a counter for "
           "indexes used\n");
    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 ){
      if( !bQuiet ){
        printf("Cannot compile LOG entry %d (%s): %s\n",
             sqlite3_column_int(pStmt, 1), zLog, sqlite3_errmsg(db));
        fflush(stdout);
      }
      nErr++;
    }else{
      nRow++;
      if( iProgress>0 && (nRow%iProgress)==0 ){
        printf("%d...\n", nRow);
        fflush(stdout);
      }
      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;
        if( zUsing && sqlite3_strnicmp(zUsing, z1, n)==0 ){
          printf("Using %s:\n%s\n", zUsing, zLog);
          fflush(stdout);

        }
        sqlite3_bind_text(pIncrCnt,1,z1,n,SQLITE_STATIC);
        sqlite3_step(pIncrCnt);
        sqlite3_reset(pIncrCnt);
      }
    }
    sqlite3_finalize(pS2);
  }
  sqlite3_finalize(pStmt);

  /* Generate the report */
................................................................................
       sqlite3_column_text(pStmt, 0),
       sqlite3_column_text(pStmt, 3));
  }
  sqlite3_finalize(pStmt);
  pStmt = 0;

errorOut:
  sqlite3_finalize(pIncrCnt);
  sqlite3_finalize(pStmt);
  sqlite3_close(db);
  return nErr;
}