Sqlserver数据库如何查询数据量大小？_sqlserver查询表占用空间大小

可以使用以下 SQL 语句查询 SQL Server 数据库中表的数量、占用空间大小以及平均行大小：

SELECT
    t.NAME AS TableName,
    p.rows AS RowCounts,
    SUM(a.total_pages) * 8 AS TotalSpaceKB,
    CAST(ROUND((SUM(a.total_pages) * 8.00 / 1024), 2) AS NUMERIC(36, 2)) AS TotalSpaceMB,
    CAST(ROUND((SUM(a.total_pages) * 8.00 / 1024 / p.rows), 2) AS NUMERIC(36, 2)) AS AverageRowSpaceKB
FROM
    sys.tables t
INNER JOIN
    sys.indexes i ON t.OBJECT_ID = i.object_id
INNER JOIN
    sys.partitions p ON i.object_id = p.OBJECT_ID AND i.index_id = p.index_id
INNER JOIN
    sys.allocation_units a ON p.partition_id = a.container_id
WHERE t.NAME NOT LIKE 'dt%' AND t.is_ms_shipped = 0 AND i.OBJECT_ID > 255
GROUP BY t.NAME, p.Rows
ORDER BY t.NAME

说明：

• t.NAME：表名称
• p.rows：表中数据行数
• SUM(a.total_pages) * 8：表占用的空间大小（单位：KB）
• CAST(ROUND((SUM(a.total_pages) * 8.00 / 1024), 2) AS NUMERIC(36, 2))：表占用的空间大小（单位：MB）
• CAST(ROUND((SUM(a.total_pages) * 8.00 / 1024 / p.rows), 2) AS NUMERIC(36, 2))：表平均每行数据占用的空间（单位：KB）

可以根据需要修改查询条件来查询指定的表空间信息。