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关于数据库分区后的几个查询和补充

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Release: 2016-06-07 15:24:09
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--查看分区及分区范围的情况select * from sys.partitions where object_id = object_id('SecureUsbLog');select * from sys.partition_range_values;--查看分区架构情况select * from sys.partition_schemes;--查看某一特定分区列值属于哪个分区select M2.$

--查看分区及分区范围的情况
select * from sys.partitions where object_id = object_id('SecureUsbLog');
select * from sys.partition_range_values;


--查看分区架构情况
select * from sys.partition_schemes;


--查看某一特定分区列值属于哪个分区
select M2.$partition.Part_mediasec_func('20150325') as partition_num;


--查看某一特定分区的记录
select * from SecureUsbLog where M2.$partition.Part_mediasec_func(logTime) = 3


--查看各分区所包含的记录数
select $partition.Part_mediasec_func(logTime) as partition_num,
count(*) as record_num
from SecureUsbLog 
group by $partition.Part_mediasec_func(logTime)
order by $partition.Part_mediasec_func(logTime);
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这部分是为了以后扩展,比如以后分区不够的时候,可以手动的添加分区。

--添加文件组
alter database M2
add filegroup [FG10];
go
--文件组
alter database M2
add file(name=FG10_data,filename='c:\esafenet\FG10_data.ndf',size=1MB) to filegroup[FG10];
--添加分区,以后扩展
USE M2    
GO    
ALTER PARTITION SCHEME Part_mediasec_scheme NEXT USED FG10    
ALTER PARTITION FUNCTION Part_mediasec_func() SPLIT RANGE ('20221231 23:59:59') 
GO
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数据库日志这块,分区是一个很好的选择,如果不分区,还有一个方法就是日志分表,按月将每个月的数据放到不同的表中。

总之日志这块分区是一个很好的选择,但也不是唯一的选择,还有一个就是syslog。什么是syslog?

下集我再分享。


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