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Overview
Comment:In the "pgidx" report from "showdb", also show the number of rows on each database btree page.
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SHA3-256: 2bda9dc41c07092ae37d0c6001c1271e0622bfff7151201fc2bb4c95422c087b
User & Date: drh 2019-04-17 13:23:28.341
Context
2019-04-17
13:58
Fix a typo in the CLI help output for the ".dump" command. (check-in: 57638248de user: drh tags: trunk)
13:23
In the "pgidx" report from "showdb", also show the number of rows on each database btree page. (check-in: 2bda9dc41c user: drh tags: trunk)
12:29
In the "pgidx" command of the showdb utility, try to identify orphaned pages and show when pages have been zeroed out. (check-in: eed701ef91 user: drh tags: trunk)
Changes
Side-by-Side Diff Ignore Whitespace Patch
Changes to tool/showdb.c.
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  const char *zName     /* Name of the table */
){
  unsigned char *a;
  const char *zType = "corrupt node";
  int nCell;
  int i;
  int hdr = pgno==1 ? 100 : 0;
  char zEntry[30];

  if( pgno<=0 || pgno>g.mxPage ) return;
  a = fileRead((pgno-1)*g.pagesize, g.pagesize);
  switch( a[hdr] ){
    case 0: {
      if( allZero(a, g.pagesize) ){
        zType = "zeroed page";
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    case 10: zType = "leaf of index";           break;
    case 13: zType = "leaf of table";           break;
    default: {
      if( parent<0 ) return;
      zType = "corrupt node";
    }
  }
  nCell = a[hdr+3]*256 + a[hdr+4];
  if( nCell==1 ){
    sqlite3_snprintf(sizeof(zEntry),zEntry,"1 row");
  }else{
    sqlite3_snprintf(sizeof(zEntry),zEntry,"%d rows", nCell);
  }
  if( parent>0 ){
    page_usage_msg(pgno, "%s [%s], child %d of page %d",
                   zType, zName, idx, parent);
    page_usage_msg(pgno, "%s [%s], child %d of page %d, %s",
                   zType, zName, idx, parent, zEntry);
  }else if( parent==0 ){
    page_usage_msg(pgno, "root %s [%s]", zType, zName);
    page_usage_msg(pgno, "root %s [%s], %s", zType, zName, zEntry);
  }else{
    page_usage_msg(pgno, "orphaned %s", zType);
    page_usage_msg(pgno, "orphaned %s, %s", zType, zEntry);
  }
  nCell = a[hdr+3]*256 + a[hdr+4];
  if( a[hdr]==2 || a[hdr]==5 ){
    int cellstart = hdr+12;
    unsigned int child;
    for(i=0; i<nCell; i++){
      int ofst;

      ofst = cellstart + i*2;
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