数据库空间大小
--日志空间占用
dbcc sqlperf(logspace) with no_infomsgs
--数据库表空间大小
SELECT
t.NAME AS TableName,
s.Name AS SchemaName,
p.rows AS RowCounts,
SUM(a.total_pages) * 8 AS TotalSpaceKB,
CAST(ROUND(((SUM(a.total_pages) * 8) / 1024.00), 2) AS NUMERIC(36, 2)) AS TotalSpaceMB,
SUM(a.used_pages) * 8 AS UsedSpaceKB,
CAST(ROUND(((SUM(a.used_pages) * 8) / 1024.00), 2) AS NUMERIC(36, 2)) AS UsedSpaceMB,
(SUM(a.total_pages) - SUM(a.used_pages)) * 8 AS UnusedSpaceKB,
CAST(ROUND(((SUM(a.total_pages) - SUM(a.used_pages)) * 8) / 1024.00, 2) AS NUMERIC(36, 2)) AS UnusedSpaceMB
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
WHERE
t.NAME NOT LIKE 'dt%'
AND t.is_ms_shipped = 0
AND i.OBJECT_ID > 255
GROUP BY
t.Name, s.Name, p.Rows
ORDER BY
t.Name,totalspaceMB
数据库空间大小检查索引是否丢失
SELECT TOP 100
ROUND(s.avg_total_user_cost * s.avg_user_impact * ( s.user_seeks
+ s.user_scans ),
0) AS [Total Cost] ,
s.avg_total_user_cost * ( s.avg_user_impact / 100.0 ) * ( s.user_seeks
+ s.user_scans ) AS Improvement_Measure ,
DB_NAME() AS DatabaseName ,
d.[statement] AS [Table Name] ,
equality_columns ,
inequality_columns ,
included_columns
FROM sys.dm_db_missing_index_groups g
INNER JOIN sys.dm_db_missing_index_group_stats s ON s.group_handle = g.index_group_handle
INNER JOIN sys.dm_db_missing_index_details d ON d.index_handle = g.index_handle
WHERE s.avg_total_user_cost * ( s.avg_user_impact / 100.0 ) * ( s.user_seeks
+ s.user_scans ) > 10
ORDER BY [Total Cost] DESC ,
s.avg_total_user_cost * s.avg_user_impact * ( s.user_seeks
+ s.user_scans ) DESC
查询某个表的列名称、说明、备注、类型等
SELECT
表名 = case when a.colorder=1 then d.name else '' end,
表说明 = case when a.colorder=1 then isnull(f.value,'') else '' end,
字段序号 = a.colorder,
字段名 = a.name,
标识 = case when COLUMNPROPERTY( a.id,a.name,'IsIdentity')=1 then '√'else '' end,
主键 = case when exists(SELECT 1 FROM sysobjects where xtype='PK' and parent_obj=a.id and name in (
SELECT name FROM sysindexes WHERE indid in( SELECT indid FROM sysindexkeys WHERE id = a.id AND colid=a.colid))) then '√' else '' end,
类型 = b.name,
占用字节数 = a.length,
长度 = COLUMNPROPERTY(a.id,a.name,'PRECISION'),
小数位数 = isnull(COLUMNPROPERTY(a.id,a.name,'Scale'),0),
允许空 = case when a.isnullable=1 then '√'else '' end,
默认值 = isnull(e.text,''),
字段说明 = isnull(g.[value],'')
FROM
syscolumns a
left join
systypes b
on
a.xusertype=b.xusertype
inner join
sysobjects d
on
a.id=d.id and d.xtype='U' and d.name<>'dtproperties'
left join
syscomments e
on
a.cdefault=e.id
left join
sys.extended_properties g
on
a.id=G.major_id and a.colid=g.minor_id
left join
sys.extended_properties f
on
d.id=f.major_id and f.minor_id=0
where d.name='a_crnh' --如果只查询指定表,加上此红色where条件，tablename是要查询的表名；去除红色where条件查询说有的表信息
order by
a.id,a.colorder
被锁的表以及如何解锁
查看被锁表：
select request_session_id spid,OBJECT_NAME(resource_associated_entity_id) tableName
from sys.dm_tran_locks where resource_type='OBJECT'
spid 锁表进程
tableName 被锁表名
解锁：
declare @spid int
Set @spid = 57 --锁表进程
declare @sql varchar(1000)
set @sql='kill '+cast(@spid as varchar)
exec(@sql)
EXEC sp_who active --看哪个引起的阻塞，blk blk<>0
EXEC sp_lock --看锁住了那个资源id，objid objid<>0
查询正在运行的进程
SELECT
spid,
blocked,
DB_NAME(sp.dbid) AS DBName,
program_name,
waitresource,
lastwaittype,
sp.loginame,
sp.hostname,
a.[Text] AS [TextData],
sp.stmt_start,
sp.stmt_end,
SUBSTRING (
A. TEXT,
sp.stmt_start / 2,
(
CASE
WHEN sp.stmt_end = - 1 THEN
DATALENGTH(A. TEXT)
ELSE
sp.stmt_end
END - sp.stmt_start
) / 2
) AS [current_cmd]
FROM
sys.sysprocesses AS sp OUTER APPLY sys.dm_exec_sql_text (sp.sql_handle) AS A
WHERE
spid > 50
ORDER BY
blocked DESC,
DB_NAME(sp.dbid) ASC,
a.[text];
日志查询和清理
USE tempdb
GO
IF OBJECT_ID('dbo.#tbl_DBLogSpaceUsage') IS NOT NULL
BEGIN
DROP TABLE dbo.#tbl_DBLogSpaceUsage
END
CREATE TABLE dbo.#tbl_DBLogSpaceUsage
(
DatabaseName NVARCHAR(128) ,
LogSize NVARCHAR(25) ,
LogSpaceUsed NVARCHAR(25) ,
[Status] TINYINT
)
INSERT INTO dbo.#tbl_DBLogSpaceUsage
EXEC ( 'DBCC SQLPERF(LOGSPACE)'
)
--查询全部结果：
SELECT DatabaseName ,
LogSize ,
LogSpaceUsed ,
[Status]
FROM dbo.#tbl_DBLogSpaceUsage order by convert(FLOAT,LogSize)
--释放空间
１.右键在清除日志的数据库，如“TestDB”，点击[新建查询（Q）]
２.输入以下SQL语句，其中“TestDB”是数据库名称
DUMP TRANSACTION TestDB WITH NO_LOG
３.执行该SQL，成功后继续以下操作
４.右键该数据库节点，点击[任务（T）] -> [收缩（S）] -> [文件（F）]
５.在弹出的“收缩文件”对话框中，将“文件类型（T）”选为“日志”，将“收缩操作”选中“在释放未使用的空间前重新组织页（O）”
６.在“将文件收缩到（K）”文本框中输入后面提示的最小大小的数值，点击[确定]即可。
SET NOCOUNT ON
DECLARE @LogicalFileName sysname,
@MaxMinutes INT,
@NewSize INT
USE tablename -- 要操作的数据库名
SELECT @LogicalFileName = 'oa_log', -- 日志文件名
@MaxMinutes = 10, -- Limit on time allowed to wrap log.
@NewSize = 1 -- 你想设定的日志文件的大小(M)
-- Setup / initialize
DECLARE @OriginalSize int
SELECT @OriginalSize = size
FROM sysfiles
WHERE name = @LogicalFileName
SELECT 'Original Size of ' + db_name() + ' LOG is ' +
CONVERT(VARCHAR(30),@OriginalSize) + ' 8K pages or ' +
CONVERT(VARCHAR(30),(@OriginalSize*8/1024)) + 'MB'
FROM sysfiles
WHERE name = @LogicalFileName
CREATE TABLE DummyTrans
(DummyColumn char (8000) not null)
DECLARE @Counter INT,
@StartTime DATETIME,
@TruncLog VARCHAR(255)
SELECT @StartTime = GETDATE(),
@TruncLog = 'BACKUP LOG ' + db_name() + ' WITH TRUNCATE_ONLY'
----收缩数据库日志文件，收到@NewSizeM
DBCC SHRINKFILE (@LogicalFileName, @NewSize)
--备份
EXEC (@TruncLog)
-- Wrap the log if necessary.
WHILE @MaxMinutes > DATEDIFF (mi, @StartTime, GETDATE()) -- time has not expired
AND @OriginalSize = (SELECT size FROM sysfiles WHERE name = @LogicalFileName)
AND (@OriginalSize * 8 /1024) > @NewSize
BEGIN -- Outer loop.
SELECT @Counter = 0
WHILE ((@Counter < @OriginalSize / 16) AND (@Counter < 50000))
BEGIN -- update
INSERT DummyTrans VALUES ('Fill Log')
DELETE DummyTrans
SELECT @Counter = @Counter + 1
END
EXEC (@TruncLog)
END
SELECT 'Final Size of ' + db_name() + ' LOG is ' +
CONVERT(VARCHAR(30),size) + ' 8K pages or ' +
CONVERT(VARCHAR(30),(size*8/1024)) + 'MB'
FROM sysfiles
WHERE name = @LogicalFileName
DROP TABLE DummyTrans
SET NOCOUNT OFF
