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Overview
Comment: | Add the showstat4.exe utility program for decoding and displaying the content of the sqlite_stat4 table in a database. |
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Downloads: | Tarball | ZIP archive |
Timelines: | family | ancestors | descendants | both | trunk |
Files: | files | file ages | folders |
SHA1: |
b4d9f6053d1d95fdc1eab8ce610b51e7 |
User & Date: | drh 2014-06-24 00:59:15.223 |
Context
2014-06-24
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20:19 | Fix showstat4.c so that it decodes typecodes 8 and 9 correctly. (check-in: 9ca737c0b4 user: drh tags: trunk) | |
00:59 | Add the showstat4.exe utility program for decoding and displaying the content of the sqlite_stat4 table in a database. (check-in: b4d9f6053d user: drh tags: trunk) | |
2014-06-23
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23:28 | Add the .fullschema command to the sqlite3.exe utility. This command shows the schema and the content of the sqlite_stat tables, all in one go. Useful when reporting problems with the query planner. (check-in: ebec48921c user: drh tags: trunk) | |
Changes
Added tool/showstat4.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 | /* ** This utility program decodes and displays the content of the ** sqlite_stat4 table in the database file named on the command ** line. */ #include <stdio.h> #include <string.h> #include <stdlib.h> #include <ctype.h> #include "sqlite3.h" typedef sqlite3_int64 i64; /* 64-bit signed integer type */ /* ** Convert the var-int format into i64. Return the number of bytes ** in the var-int. Write the var-int value into *pVal. */ static int decodeVarint(const unsigned char *z, i64 *pVal){ i64 v = 0; int i; for(i=0; i<8; i++){ v = (v<<7) + (z[i]&0x7f); if( (z[i]&0x80)==0 ){ *pVal = v; return i+1; } } v = (v<<8) + (z[i]&0xff); *pVal = v; return 9; } int main(int argc, char **argv){ sqlite3 *db; sqlite3_stmt *pStmt; char *zIdx = 0; int rc, j, x, y, mxHdr; const unsigned char *aSample; int nSample; i64 iVal; const char *zSep; if( argc!=2 ){ fprintf(stderr, "Usage: %s DATABASE-FILE\n", argv[0]); exit(1); } rc = sqlite3_open(argv[1], &db); if( rc!=SQLITE_OK || db==0 ){ fprintf(stderr, "Cannot open database file [%s]\n", argv[1]); exit(1); } rc = sqlite3_prepare_v2(db, "SELECT tbl||'.'||idx, nEq, nLT, nDLt, sample " "FROM sqlite_stat4 ORDER BY 1", -1, &pStmt, 0); if( rc!=SQLITE_OK || pStmt==0 ){ fprintf(stderr, "%s\n", sqlite3_errmsg(db)); sqlite3_close(db); exit(1); } while( SQLITE_ROW==sqlite3_step(pStmt) ){ if( zIdx==0 || strcmp(zIdx, (const char*)sqlite3_column_text(pStmt,0))!=0 ){ if( zIdx ) printf("\n"); sqlite3_free(zIdx); zIdx = sqlite3_mprintf("%s", sqlite3_column_text(pStmt,0)); printf("%s:\n", zIdx); }else{ printf(" -----------------------------------------------------------\n"); } printf(" nEq = %s\n", sqlite3_column_text(pStmt,1)); printf(" nLt = %s\n", sqlite3_column_text(pStmt,2)); printf(" nDLt = %s\n", sqlite3_column_text(pStmt,3)); printf(" sample = x'"); aSample = sqlite3_column_blob(pStmt,4); nSample = sqlite3_column_bytes(pStmt,4); for(j=0; j<nSample; j++) printf("%02x", aSample[j]); printf("'\n "); zSep = " "; x = decodeVarint(aSample, &iVal); if( iVal<x || iVal>nSample ){ printf(" <error>\n"); continue; } y = mxHdr = (int)iVal; while( x<mxHdr ){ int sz; i64 v; x += decodeVarint(aSample+x, &iVal); if( x>mxHdr ) break; if( iVal<0 ) break; switch( iVal ){ case 0: sz = 0; break; case 1: sz = 1; break; case 2: sz = 2; break; case 3: sz = 3; break; case 4: sz = 4; break; case 5: sz = 6; break; case 6: sz = 8; break; case 7: sz = 8; break; case 8: sz = 0; break; case 9: sz = 0; break; case 10: case 11: sz = 0; break; default: sz = (int)(iVal-12)/2; break; } if( y+sz>nSample ) break; if( iVal==0 ){ printf("%sNULL", zSep); }else if( iVal<=7 ){ v = (signed char)aSample[y]; for(j=1; j<sz; j++){ v = (v<<8) + aSample[y+j]; } if( iVal==7 ){ double r; memcpy(&r, &v, sizeof(r)); printf("%s%#g", zSep, r); }else{ printf("%s%lld", zSep, v); } }else if( (iVal&1)==0 ){ printf("%sx'", zSep); for(j=0; j<sz; j++){ printf("%02x", aSample[y+j]); } printf("'"); }else{ printf("%s\"", zSep); for(j=0; j<sz; j++){ char c = (char)aSample[y+j]; if( isprint(c) ){ if( c=='"' || c=='\\' ) putchar('\\'); putchar(c); }else if( c=='\n' ){ printf("\\n"); }else if( c=='\t' ){ printf("\\t"); }else if( c=='\r' ){ printf("\\r"); }else{ printf("\\%03o", c); } } printf("\""); } zSep = ","; y += sz; } printf("\n"); } sqlite3_free(zIdx); sqlite3_finalize(pStmt); sqlite3_close(db); return 0; } |