SqlServer查看数据库大小

可通过查看表大小进行分库分表操作
-- 查询特定表的大小
EXEC sp_spaceused 'your_table_name';
-- 查询所有表的大小
SELECT 
    t.NAME AS TableName,
    s.Name AS SchemaName,
    p.rows,
    CAST(SUM(a.total_pages) * 8 / 1024.0 / 1024.0 AS DECIMAL(18, 2)) AS TotalSpaceGB,
    CAST(SUM(a.used_pages) * 8 / 1024.0 / 1024.0 AS DECIMAL(18, 2)) AS UsedSpaceGB,
    CAST((SUM(a.total_pages) - SUM(a.used_pages)) * 8 / 1024.0 / 1024.0 AS DECIMAL(18, 2)) AS UnusedSpaceGB
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
LEFT OUTER JOIN 
    sys.schemas s ON t.schema_id = s.schema_id
GROUP BY 
    t.Name, s.Name, p.Rows
ORDER BY 
    t.Name;
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