SqlServer2008R2基础知识

Posted 2023-02-02

1.查看sqlServer事务隔离基本

dbcc useroptions;

2.设置事务的隔离级别

set transaction isolation level read uncommitted;

3.查看锁视图

select request_session_id,
       resource_type,
       request_status,
       request_mode,
       resource_description,
       object_name(p.object_id) as object_name,
       p.index_id
  from sys.dm_tran_locks
  left join sys.partitions p
    on sys.dm_tran_locks.resource_associated_entity_id = p.hobt_id;

4.格林威治时间 转换为北京时间（北京时间=GMT时间+8小时）

例如：2016-06-08T08:11:35

转换后：2016-06-08 16:11:35.000

select switchoffset(2016-06-08T08:11:35, +08:00);

5.查询数据库的连接数

(1).查看当前数据库设置的最大连接

select @@max_connections;

(2).查看sqlserver当前的连接数

select loginame,count(1) as Nums FROM sys.sysprocesses GROUP by loginame ORDER by 2 desc;