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ORACLE 11G Data Guard role conversion, 11 gguard1. ORACLE login uard Role SwitchingDataGuard is now the mainstream disaster tolerance solution. Due to its strong adaptability to the network, it can adopt synchronous real-time transmission mode and

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Mysql client data garbled, mysql client garbled Garbled characters appear when inserting Chinese data into mysql: Mysql> select * from test;+ ------ + ----------- +| Id | name |+ ------ + ----------- +| 1 | why does one fail? || 2 | too many threads?

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Use of packages in OracleUse in Oracle The main purpose of using a package is to modularize the program. The package can combine the relevant stored procedures, functions, variables, constants, cursors, and other PL/SQL programs, in this way, code

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T_ SQL rowtype, t_sqlrowtype T-SQL formats: Declare Statement Begin Processing End -- complete   Nvl function nvl (string, value ); Returns a string if the string is not empty. Returns the value if the string is null.   Enter a job

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Database Operations-triggers, databases-triggers

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How to disable the deadlock process in PostgreSQL, postgresql Process The PostgreSQL database used has no information. Google had to proceed. Finally, a solution was found in an English forum. As follows: 1. Retrieve the ID of the deadlock

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Linux mysql regular backup and compression, linuxmysql 1. Check whether the mysql BACKUP command works. Create a backup directory under the var directory and a mysql directory under the backup Directory to store mysql backup files Cd to

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Redis persistence-RDB and Redis persistence-RDBRedis provides a RDB persistence mechanism, that is, to write data set snapshots in the memory to the disk at a specified interval.Advantages of RDB:1. In this way, there is only one file to back up the

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