在使用MySQL作為數(shù)據(jù)庫管理系統(tǒng)時,我們需要進行容量預(yù)估,以保證系統(tǒng)能夠正常運行且不會因為存儲空間不足而出現(xiàn)問題。在進行容量預(yù)估時,我們需要重點關(guān)注數(shù)據(jù)量和數(shù)據(jù)表大小兩個方面。下面,我們將介紹如何進行MySQL容量預(yù)估。
數(shù)據(jù)量預(yù)估
SELECT
ROUND(SUM(data_length + index_length) / 1024 / 1024 / 1024, 2) AS 'Total Size (GB)'
FROM information_schema.TABLES
WHERE TABLE_SCHEMA = 'yourdatabase'
以上SQL語句可以獲取MySQL數(shù)據(jù)庫的總?cè)萘看笮 ?/p>
數(shù)據(jù)表大小預(yù)估
SELECT
TABLE_NAME AS `Table`,
ROUND((data_length + index_length) / 1024 / 1024, 2) AS `Size (MB)`
FROM information_schema.TABLES
WHERE TABLE_SCHEMA = 'yourdatabase'
ORDER BY (data_length + index_length) DESC;
以上SQL語句可以獲取MySQL數(shù)據(jù)庫中每個表的容量大小。
容量預(yù)估結(jié)果對齊
SELECT
TABLE_NAME AS `Table`,
CONCAT(
LPAD(ROUND((data_length + index_length) / 1024 / 1024 / 1024), 2), ' GB '
),
CONCAT(
LPAD(ROUND((data_length + index_length) / 1024 / 1024), 2), ' MB '
),
CONCAT(
LPAD(ROUND((data_length + index_length) / 1024), 2), ' KB '
),
CONCAT(
LPAD(ROUND(data_length / 1024 / 1024), 2), ' MB '
) "Data Size",
CONCAT(
LPAD(ROUND(index_length / 1024 / 1024), 2), ' MB '
) "Index Size",
CONCAT(
LPAD(ROUND((data_length + index_length) / 1024 / 1024), 2), ' MB '
) "Total Size"
FROM
information_schema.TABLES
WHERE
TABLE_SCHEMA = 'yourdatabase'
ORDER BY
(data_length + index_length) DESC;
以上SQL語句可以得到MySQL數(shù)據(jù)庫中每個表的容量大小,并將結(jié)果對齊。