Back up

Hejsa,

Jeg benytter i skrivende stund nedenstående script til at tage backup af min SQL. Jeg gør det jævnligt, men er stødt på en ting der undre mig meget. Databasen har det naturligvis med at blive større og større jo mere der kommer ind, og min backups blev da også større og større.. Men efter den sidste backup på ca. 8 mb, har jeg hvergang kun lavet backups på ca. 400 kb.. Syntes det er mærkeligt de er blevet så meget mindre selvom der stadigvæk bør komme mere på.. Nogen der har en god forklaring?

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<?php
   
  $dbhost = "";
  $dbuname = "";
  $dbpass = "";
  $dbname = "";

  @set_time_limit(600);
  $crlf="\n";

  // Danish Text   
  $strNoTablesFound = "Ingen databasetabeller fundet";
  $strHost = "Host";
  $strDatabase = "Database ";
  $strTableStructure = "Struktur for tabel";
  $strDumpingData = "Indhold af tabel";
  $strError = "Fejl";
  $strSQLQuery = "SQL-query";
  $strMySQLSaid = "MySQL: ";
  $strBack = "Tilbage";
  $strFileName = "DB-dump";
  $strName = "Backup af database";
  $strDone = "Downloadet d.";
  $strat = "kl.";
  $date_jour = date ("d-m-Y");       
       
  header("Content-disposition: filename=$strFileName $dbname $date_jour.sql");
  header("Content-type: application/ms-download");
  header("Pragma: no-cache");
  header("Expires: 0");
       
  // doing some DOS-CRLF magic...
  $client = getenv("HTTP_USER_AGENT");
  if(ereg('[^(]*\((.*)\)[^)]*',$client,$regs))
  {
    $os = $regs[1];
    // this looks better under WinX
    if (eregi("Win",$os))
      $crlf="\r\n";
  }
       
       
  function my_handler($sql_insert)
  {
    global $crlf;
    echo "$sql_insert;$crlf";
  }
       
  // Get the content of $table as a series of INSERT statements.
  // After every row, a custom callback function $handler gets called.
  // $handler must accept one parameter ($sql_insert);
  function get_table_content($db, $table, $handler)
  {
    $result = mysql_db_query($db, "SELECT * FROM $table") or mysql_die();
    $i = 0;
    while($row = mysql_fetch_row($result))
    {
      $table_list = "(";
       
      for($j=0; $j<mysql_num_fields($result);$j++)
                    $table_list .= mysql_field_name($result,$j).", ";
       
      $table_list = substr($table_list,0,-2);
      $table_list .= ")";
       
      if(isset($GLOBALS["showcolumns"]))
        $schema_insert = "INSERT INTO $table $table_list VALUES (";
      else
        $schema_insert = "INSERT INTO $table VALUES (";
       
      for($j=0; $j<mysql_num_fields($result);$j++)
      {
        if(!isset($row[$j]))
          $schema_insert .= " NULL,";
        elseif($row[$j] != "")
          $schema_insert .= " '".addslashes($row[$j])."',";
        else
          $schema_insert .= " '',";
      }
      $schema_insert = ereg_replace(",$", "", $schema_insert);
      $schema_insert .= ")";
      $handler(trim($schema_insert));
      $i++;
    }
    return (true);
  }
       
  // Return $table's CREATE definition
  // Returns a string containing the CREATE statement on success
  function get_table_def($db, $table, $crlf)
  {
    $schema_create = "";
    $schema_create .= "DROP TABLE IF EXISTS $table; CREATE TABLE $table ($crlf";
       
    $result = mysql_db_query($db, "SHOW FIELDS FROM $table") or mysql_die();
    while($row = mysql_fetch_array($result))
    {
      $schema_create .= "  $row[Field] $row[Type]";
       
      if(isset($row["Default"]) && (!empty($row["Default"]) || $row["Default"] == "0"))
        $schema_create .= " DEFAULT '$row[Default]'";
      if($row["Null"] != "YES")
        $schema_create .= " NOT NULL";
      if($row["Extra"] != "")
        $schema_create .= " $row[Extra]";
      $schema_create .= ",$crlf";
    }
    $schema_create = ereg_replace(",".$crlf."$", "", $schema_create);
    $result = mysql_db_query($db, "SHOW KEYS FROM $table") or mysql_die();
    while($row = mysql_fetch_array($result))
    {
      $kname=$row['Key_name'];
      if(($kname != "PRIMARY") && ($row['Non_unique'] == 0))
        $kname="UNIQUE|$kname";
      if(!isset($index[$kname]))
        $index[$kname] = array();
      $index[$kname][] = $row['Column_name'];
    }
       
    while(list($x, $columns) = @each($index))
    {
      $schema_create .= ",$crlf";
      if($x == "PRIMARY")
        $schema_create .= "  PRIMARY KEY (" . implode($columns, ", ") . ")";
      elseif (substr($x,0,6) == "UNIQUE")
        $schema_create .= "  UNIQUE ".substr($x,7)." (" . implode($columns, ", ") . ")";
      else
        $schema_create .= "  KEY $x (" . implode($columns, ", ") . ")";
    }
       
    $schema_create .= "$crlf)";
    return (stripslashes($schema_create));
  }
       
  function mysql_die($error = "")
  {
    echo "<b> $strError </b><p>";
    if(isset($sql_query) && !empty($sql_query))
    {
      echo "$strSQLQuery: <pre>$sql_query</pre><p>";
    }
    if(empty($error))
      echo $strMySQLSaid.mysql_error();
    else
      echo $strMySQLSaid.$error;
    echo "<br><a href=\"java script:history.go(-1)\">$strBack</a>";
    exit;
  }
       
  global $bruger, $dbhost, $dbuname, $dbpass, $dbname;
  mysql_connect($dbhost, $dbuname, $dbpass);
  @mysql_select_db("$dbname") or die ("Kunne ikke forbinde til databasen");
       
  $tables = mysql_list_tables($dbname);
       
  $num_tables = @mysql_numrows($tables);
  if($num_tables == 0)
  {
    echo $strNoTablesFound;
  }
  else
  {
    $i = 0;
    $heure_jour = date ("H:i");
    print "# ========================================================$crlf";
    print "#$crlf";
    print "# $strName : $dbname$crlf";
    print "# $strDone $date_jour $strat $heure_jour $crlf";
    print "#$crlf";
    print "# ========================================================$crlf";
    print "$crlf";
           
    while($i < $num_tables)
    {
      $table = mysql_tablename($tables, $i);
       
      print $crlf;
      print "# --------------------------------------------------------$crlf";
      print "#$crlf";
      print "# $strTableStructure '$table'$crlf";
      print "#$crlf";
      print $crlf;
       
      echo get_table_def($dbname, $table, $crlf).";$crlf$crlf";
               
      print "#$crlf";
      print "# $strDumpingData '$table'$crlf";
      print "#$crlf";
      print $crlf;
           
      get_table_content($dbname, $table, "my_handler");
       
      $i++;
    }
  }
       
?>