SOME：收缩数据库日志文件，查看表数据量和空间占用，查看表结构索引修改时间

---收缩数据库日志文件

USE [master]
ALTER DATABASE yourdatabasename SET RECOVERY SIMPLE WITH NO_WAIT
ALTER DATABASE yourdatabasename SET RECOVERY SIMPLE
USE yourdatabasename 
DBCC SHRINKFILE (N'yourdatabasename _Log' , 0,TRUNCATEONLY) --数据库日志文件名（数据库右键-属性-日志逻辑文件名）
USE [master]
ALTER DATABASE yourdatabasename SET RECOVERY FULL WITH NO_WAIT
ALTER DATABASE yourdatabasename SET RECOVERY FULL

---查看各表数据量 和 占用空间

CREATE TABLE #T (NAME nvarchar(100),ROWS char(20),reserved varchar(18) ,Data varchar(18) ,index_size varchar(18) ,Unused varchar(18) )
GO
INSERT #T EXEC SP_MSFOREACHTABLE 'EXEC sp_spaceused "?"'

SELECT * FROM #T ORDER BY CONVERT(INT,REPLACE(DATA,'KB','')) DESC

--查看表结构（字段属性，索引）

SELECT
表名=CASE WHEN C.column_id=1 THEN O.name ELSE N'' END,
表说明=ISNULL(CASE WHEN C.column_id=1 THEN PTB.[value] END,N''),
字段序号=C.column_id,
字段名=C.name,
主键=ISNULL(IDX.PrimaryKey,N''),
标识=CASE WHEN C.is_identity=1 THEN N'√'ELSE N'' END,
计算列=CASE WHEN C.is_computed=1 THEN N'√'ELSE N'' END,
类型=T.name,
长度=C.max_length,
精度=C.precision,
小数位数=C.scale,
允许空=CASE WHEN C.is_nullable=1 THEN N'√'ELSE N'' END,
默认值=ISNULL(D.definition,N''),
字段说明=ISNULL(PFD.[value],N''),
索引名=ISNULL(IDX.IndexName,N''),
索引排序=ISNULL(IDX.Sort,N''),
创建时间=O.Create_Date,
修改时间=O.Modify_date
FROM sys.columns C
INNER JOIN sys.objects O
ON C.[object_id]=O.[object_id]
AND O.type='U'
AND O.is_ms_shipped=0
INNER JOIN sys.types T
ON C.user_type_id=T.user_type_id
LEFT JOIN sys.default_constraints D
ON C.[object_id]=D.parent_object_id
AND C.column_id=D.parent_column_id
AND C.default_object_id=D.[object_id]
LEFT JOIN sys.extended_properties PFD
ON PFD.class=1
AND C.[object_id]=PFD.major_id
AND C.column_id=PFD.minor_id
-- AND PFD.name='Caption' -- 字段说明对应的描述名称(一个字段可以添加多个不同name的描述)
LEFT JOIN sys.extended_properties PTB
ON PTB.class=1
AND PTB.minor_id=0
AND C.[object_id]=PTB.major_id
-- AND PFD.name='Caption' -- 表说明对应的描述名称(一个表可以添加多个不同name的描述)
LEFT JOIN -- 索引及主键信息
(
SELECT
IDXC.[object_id],
IDXC.column_id,
Sort=CASE INDEXKEY_PROPERTY(IDXC.[object_id],IDXC.index_id,IDXC.index_column_id,'IsDescending')
WHEN 1 THEN 'DESC' WHEN 0 THEN 'ASC' ELSE '' END,
PrimaryKey=CASE WHEN IDX.is_primary_key=1 THEN N'√'ELSE N'' END,
IndexName=IDX.Name
FROM sys.indexes IDX
INNER JOIN sys.index_columns IDXC
ON IDX.[object_id]=IDXC.[object_id]
AND IDX.index_id=IDXC.index_id
LEFT JOIN sys.key_constraints KC
ON IDX.[object_id]=KC.[parent_object_id]
AND IDX.index_id=KC.unique_index_id
INNER JOIN -- 对于一个列包含多个索引的情况,只显示第1个索引信息
(
SELECT [object_id], Column_id, index_id=MIN(index_id)
FROM sys.index_columns
GROUP BY [object_id], Column_id
) IDXCUQ
ON IDXC.[object_id]=IDXCUQ.[object_id]
AND IDXC.Column_id=IDXCUQ.Column_id
AND IDXC.index_id=IDXCUQ.index_id
) IDX
ON C.[object_id]=IDX.[object_id]
AND C.column_id=IDX.column_id
WHERE O.name = 'tablename'
-- 如果只查询指定表,加上此条件
ORDER BY O.name,C.column_id