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如何找到 MySQL 数据库的大小？

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如何找到 MySQL 数据库的大小？

有人告诉我，这show table status在查找数据库大小时很有用，但我得到的是一团乱麻。有没有办法改变这个命令以获取更少的信息，或者有没有其他方法可以查找数据库或表的大小？

答案1

您想要的两个字段是。

  • 数据长度

    这是表内数据的大小（以字节为单位）。

  • 索引长度

    这是表索引的大小（以字节为单位）。

您可以将输出限制为具有数据库的一个表。

SHOW TABLE STATUS LIKE 'tablename';

您无法从输出中删除其他列。您可能会发现通过垂直打印输出行，从控制台读取输出会更容易。只需将“ ;”替换为“ \G”。

答案2

我有一组相当疯狂的查询可以很好地解决这个问题。我大约 2 年前写了这些，它们效果很好。我仍然用它们向客户报告。

查询按存储引擎分组的数据库大小（以 MB 为单位）

SELECT IFNULL(B.engine,'Total') "Storage Engine",         
  CONCAT(LPAD(REPLACE(FORMAT(B.DSize/POWER(1024,pw),3),',',''),17,' '),' ',SUBSTR('KMGTP',pw+1,1),'B') "Data Size",
  CONCAT(LPAD(REPLACE(FORMAT(B.ISize/POWER(1024,pw),3),',',''),17,' '),' ',SUBSTR(' KMGTP',pw+1,1),'B') "Index Size",
  CONCAT(LPAD(REPLACE(FORMAT(B.TSize/POWER(1024,pw),3),',',''),17,' '),' ',SUBSTR(' KMGTP',pw+1,1),'B') "Table Size" 
FROM (
  SELECT engine,SUM(data_length) DSize,
    SUM(index_length) ISize,
    SUM(data_length+index_length) TSize 
  FROM information_schema.tables 
  WHERE table_schema NOT IN ('mysql','information_schema','performance_schema')
    AND engine IS NOT NULL 
  GROUP BY engine WITH ROLLUP) B,
(SELECT 2 pw) A 
ORDER BY TSize;

查询以数据库大小（按 MB 分组）

SELECT DBName,
  CONCAT(LPAD(FORMAT(SDSize/POWER(1024,pw),3),17,' '),' ',SUBSTR(' KMGTP',pw+1,1),'B') "Data Size",
  CONCAT(LPAD(FORMAT(SXSize/POWER(1024,pw),3),17,' '),' ',SUBSTR(' KMGTP',pw+1,1),'B') "Index Size",
  CONCAT(LPAD(FORMAT(STSize/POWER(1024,pw),3),17,' '),' ',SUBSTR(' KMGTP',pw+1,1),'B') "Total Size" 
FROM (
  SELECT IFNULL(DB,'All Databases') DBName,
  SUM(DSize) SDSize,
  SUM(XSize) SXSize,
  SUM(TSize) STSize 
  FROM (
    SELECT table_schema DB,
      data_length DSize,
      index_length XSize,
      data_length+index_length TSize 
    FROM information_schema.tables 
    WHERE table_schema NOT IN ('mysql','information_schema','performance_schema')) AAA 
    GROUP BY DB WITH ROLLUP
) AA,
(SELECT 2 pw) BB 
ORDER BY (SDSize+SXSize);

查询按数据库和存储引擎分组的数据库大小（以 MB 为单位）

SELECT Statistic,DataSize "Data Size",
  IndexSize "Index Size",
  TableSize "Table Size" 
FROM (
  SELECT IF(ISNULL(table_schema)=1,10,0) schema_score,
    IF(ISNULL(engine)=1,10,0) engine_score,
    IF(ISNULL(table_schema)=1,'ZZZZZZZZZZZZZZZZ',table_schema) schemaname,
    IF(ISNULL(B.table_schema)+ISNULL(B.engine)=2,
    "Storage for All Databases",
    IF(ISNULL(B.table_schema)+ISNULL(B.engine)=1,
    CONCAT("Storage for ",B.table_schema),
    CONCAT(B.engine," Tables for ",B.table_schema))) Statistic,
    CONCAT(LPAD(REPLACE(FORMAT(B.DSize/POWER(1024,pw),3),',',''),17,' '),' ',SUBSTR(' KMGTP',pw+1,1),'B') DataSize,
    CONCAT(LPAD(REPLACE(FORMAT(B.ISize/POWER(1024,pw),3),',',''),17,' '),' ',SUBSTR(' KMGTP',pw+1,1),'B') IndexSize,
    CONCAT(LPAD(REPLACE(FORMAT(B.TSize/POWER(1024,pw),3),',',''),17,' '),' ',SUBSTR(' KMGTP',pw+1,1),'B') TableSize 
  FROM (SELECT table_schema,engine,
    SUM(data_length) DSize,
    SUM(index_length) ISize,
    SUM(data_length+index_length) TSize 
    FROM information_schema.tables 
    WHERE table_schema NOT IN ('mysql','information_schema','performance_schema') 
      AND engine IS NOT NULL 
    GROUP BY table_schema,engine WITH ROLLUP) B,
    (SELECT 2 pw) A) AA 
ORDER BY schemaname, schema_score,engine_score;

这三个查询都有一个共同点：一个简单的 SELECT 查询（SELECT 2 pw）。

pw 代表幂，即 1024 的幂。您可以调整查询以提供具有不同单位的数据库大小：

(SELECT 0 pw) --reports the Database Size in Bytes
(SELECT 1 pw) --reports the Database Size in Kilobytes
(SELECT 2 pw) --reports the Database Size in Megabytes
(SELECT 3 pw) --reports the Database Size in Gigabytes
(SELECT 4 pw) --reports the Database Size in Terabytes
(SELECT 5 pw) --reports the Database Size in Petabytes (email me if you reach this size)

尝试一下吧!!!

答案3

找到一个脚本可以做你想做的事情 -

http://www.modwest.com/help/kb6-199.html

<?

mysql_connect("db.modwest.com", "username", "password");
mysql_select_db("yourdb");

$result = mysql_query("show table status");

$size = 0;
$out = "";
while($row = mysql_fetch_array($result)) {
    $size += $row["Data_length"];
    $out .= $row["Name"] .": ". 
               round(($row["Data_length"]/1024)/1024, 2) ."<br>\n";
}

$size = round(($size/1024)/1024, 1);

echo $out ."<br>\n";
echo "Total MySQL db size: $size";
?>

答案4

尝试这个脚本：

SELECT 
    table_schema AS DataBase_Name
    ,ROUND(sum( data_length + index_length ) / 1024 /1024,1) AS OccupiedSize_inMB
    ,ROUND(sum( data_free )/ 1024 / 1024,1) AS FreeSpace_inMB 
FROM information_schema.TABLES 
GROUP BY table_schema ;

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