Sql Server数据库实用命令
1.清理日志语句:当日志容量过大时backup log isale with NO_LOG;
backup log isale with TRUNCATE_ONLY;
DBCC SHRINKDATABASE(isale);
2.Sql Server自动备份语句
declare @filename nvarchar(100) set @filename='D:dbstore/isale'+replace(replace(replace(CONVERT(varchar, getdate(), 120 ),'-',''),' ',''),':','')
+'.bak'
BACKUP DATABASE TO DISK =@filename
WITH NOFORMAT, INIT,
NAME = N'isale-完整 数据库 备份', SKIP, NOREWIND, NOUNLOAD, STATS = 10
3.Sql Server查看索引碎片
use databaseName
DBCC SHOWCONTIG
eg:对于单表
use isale
DBCC SHOWCONTIG (branch_move_in)
DBCC SHOWCONTIG scanning 'Employee' table...
Table: 'Employee' (1195151303); index ID: 1, database ID: 53
TABLE level scan performed.
- Pages Scanned................................: 179
- Extents Scanned..............................: 24
- Extent Switches..............................: 24
- Avg. Pages per Extent........................: 7.5
- Scan Density .......: 92.00%
- Logical Scan Fragmentation ..................: 0.56%
- Extent Scan Fragmentation ...................: 12.50%
- Avg. Bytes Free per Page.....................: 552.3
- Avg. Page Density (full).....................: 93.18%
DBCC execution completed.
信息描述
Pages Scanned 表或索引中的长页数
Extents Scanned 表或索引中的长区页数
Extent SwitchesDBCC遍历页时从一个区域到另一个区域的次数
Avg. Pages per Extent 相关区域中的页数
Scan Density
Best Count是连续链接时的理想区域改变数，Actual Count是实际区域改变，
Scan Density为100%表示没有分块。
Logical Scan Fragmentation 扫描索引页中失序页的百分比
Extent Scan Fragmentation 不实际相邻和包含链路中所有链接页的区域数
Avg. Bytes Free per Page 扫描页面中平均自由字节数
Avg. Page Density (full) 平均页密度，表示页有多满
重修复索引：
DBCC DBREINDEX (branch_move_in)
4.Sql Server检查数据库状态
DBCC CHECKDB
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