第一章:日志管理 1.forcing log switches sql> alter system switch logfile; 2.forcing checkpoints sql> alter system checkpoint; 3.adding online redo log groups sql> alter database add logfile [group 4]sql> ('/disk3/log4a.rdo','/disk4/log4b.rdo') size 1m…

1,DBCC SQLPERF(logspace) https://msdn.microsoft.com/en-us/library/ms189768.aspx 2, 1, LOGINFO(''HAHA3'') 2, CREATE TABLE #tracestatus (   RecoceryUntitID INT,     FileID INT,    FileSize INT,    StartOffset INT,    FSeqNo INT,    Status INT,    Parit…

mysql workbench常用命令快捷键 ctrl+T ->创建新的sql query tab ctrl+shift+enter->执行当前的sql命令 https://dev.mysql.com/doc/workbench/en/wb-keys.html 1. mysql -uroot -p 2. show databases; mysql> show databases; +--------------------+ | Database | +-----------------…

Update records ' and a.subscriber_id=b.subscriber_id; Connections select count(*) from pg_stat_activity; select client_addr,state,count(*) from pg_stat_activity group by client_addr,state order by count(*) desc; select max_conn,used,res_for_super,max…

转至:http://www.pstips.net/connect-sql-database.html PowerShell 通过ADO.NET连接SQL Server数据库,并执行SQL脚本.工作中整理的一小段脚本,后来没有用上,先记录在这里: 建立数据库连接 查询返回一个DataTatble对象 执行一条SQL语句 通过事物执行多条SQL语句 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 2…

SQL is not very flexible and it cannot be made to react differently to differing sutuations easily. In  SQL queries we normally tell database what we want but not tell it how to do it. SQL : give commands, commands complete with ; PL/SQL : follow the…

The Entity Framework Code First API includes methods that enable you to pass SQL commands directly to the database. You have the following options: Use the  DbSet.SqlQuery method for queries that return entity types. The returned objects must be of t…

sql profile最大的优点是在不修改sql语句和会话执行环境的情况下去优化sql的执行效率,适合无法在应用程序中修改sql时.sql profile最常用方法大概是:--创建产生sql tuning advisor任务DECLARE  tuning_task varchar2(100);  l_sql_id    v$session.prev_sql_id%TYPE;BEGIN  l_sql_id    := '6w02d3ggsj4xb';  tuning_task := dbms_sq…

sql - and SQL AND links together two or more conditional statements for increased filtering when running SQL commands. AND helps the developer query for very specific records while answering questions like, "I want to view all orders made by a certai…

SQL Server database administrators may frequently need in especially development and test environments  instead of the production environments to kill all the open connections to a  specific database in order to process SQL Server maintenance task ov…