计算表记录的最大存储大小? [英] Calculate the maximum storage size of table record?

问题描述

有没有一种方法可以确定在 SQL Server 中手动完成后记录的最大大小是多少?例如:

Is there a way to determine what the maximum size of a record would be in SQL Server past doing it by hand? For example:

CREATE TABLE test (
    id INT PRIMARY KEY IDENTITY(1, 1),
    name VARCHAR(256),
    test_date DATETIME
)

所以，如果我没记错的话，当手动计算该记录时，该记录最多可以是 272 字节.但是，我有一个包含更多列的表，我需要对多个表执行此操作，因此我想知道是否可以通过简单查询来执行此操作.

so, if I'm not mistaken, when calculating that by hand that record could be a maximum of 272 bytes. However, I have a table with a lot more columns than that, and I need to do this for more than one table, so I wanted to know if I could do this with a simple query.

我在 INFORMATION_SCHEMA.TABLES 甚至 INFORMATION_SCHEMA.COLUMNS 中找不到任何信息，我想我可以在其中执行简单的 SUM例子.此外，sysobjects 和 syscolumns 似乎没有必要的信息.syscolumns 表确实有一个 length 字段，但这不是实际的存储大小.

I can't find any information in INFORMATION_SCHEMA.TABLES or even INFORMATION_SCHEMA.COLUMNS where I figured I could do a simple SUM for example. Further, sysobjects and syscolumns don't seem to have the necessary information. The syscolumns table does have a length field but that's not the actual storage size.

谢谢大家！

推荐答案

试试这个:

Select  schema_name(T.schema_id) As SchemaName,
        T.Name As TableName,
        Sum(C.max_length) As RowSize
From    sys.tables T
        Inner Join sys.columns C
            ON T.object_id = C.Object_ID
        INNER JOIN sys.types S
            On C.system_type_id = S.system_type_Id
Group By schema_name(T.schema_id),
        T.Name
Order By schema_name(T.schema_id),
        T.Name

这篇关于计算表记录的最大存储大小?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！