Database Administrator

Five Core classes or interfaces of Hibernate:(1) Configuration: Used to parse the hibernate. cfg. xml file and XXXXX. hbm. xml file, and create the SessionFactory object. The Configuration object is used to configure and start Hibernate. The

Due to work requirements, we need to synchronize all the data in the Business Database to another processing server today. While working on the solution, I thought a lot of ways. Of course, the fastest way is to use physical hot backup. However, I

Copy the IBS library to orcl1. Create a password file on two databases: Set Oracle_sid = ibs Orapwd file = F: \ BBCLDB \ ORCL1 \ PWDibs1.ora password = system entries = 30 Set oracle_sid = orcl1 Orapwd file = F: \ BBCLDB \ ORCL1 \ PWDorcl1.ora

Requirements: Update the same records in Table t1 (t_statbuf) and Table t1 (T_Mt) to table t1. 1. incorrect syntax:[SQL] UpdateTable_name t1Set(A, B, c) = (SelectA, B, cFromTable_name_2 t2WhereT1.a = t2.a ); In this way, all rows in Table t1 will

Check the status of the Replica Set and execute rs. status (). Rs. status (){"Set": "set1 ","Date": "Thu Oct 28 2010 10:09:28 GMT + 0800 (CST )","MyState": 2,"Members ":[{"_ Id": 0,"Name": "192.168.95.216: 10000 ","Health": 1,"State": 1,"Uptime": 2

This section describes how to migrate a single-instance database to the rac environment. In the production environment, as the business and data volume increase, this requirement and scenario are inevitable. Generally, the following four methods are

Each subquery of union must have the same number of columns, and the columns at the corresponding position must have the same data type. However, the column names can be different. Order by can only be used in the last subquery of union.And this

Lab EnvironmentOperating System: RHEL AS4Database: Version 10.2.0.1.0On one machine, two databases are installed to perform the master-slave switchover experiment. Multiple machines share the same principle.After the experiment is successful, sort

Oracle Regular Expression Functions                                       2. REGEXP_LIKE (x, pattern [, match_option]) is used to find the Regular Expression pattern in x. This function also provides an optional parameter match_option string to

There are three main ways to install the mesh controller agent (OMA. /runInstaller. sh installation (including graphical and Silent Installation); push installation through OMS; tar package on the installed agent terminal, and decompress the

1.Edit/Etc/oratabFile,SidThat lineNChangeY  [Root @ www.bkjia.com ~] # Vi/etc/oratab  EXAMPLE After modification:Orcl:/u01/app/Oracle/product/ 10.2.0 /Db_1:Y 2.In/Etc/rc. d/init. d/Directory,

I. Test 1. download the latest sqlite source code sqlite-autoconf-3070500.tar.gz from the sqlite website http://sqlite.org/download.html. The latest version is 3.7.5. 2. decompress the source code, enter the source code folder mkdir _ install,

1. [root @ host ~] $ Oracle_HOME/bin/localconfig delete [this step may not be successfully executed, but it will not be affected] 2. [root @ host ~] Rm-rf $ ORACLE_BASE/* [You can manually delete the installation directories and files in oracle] 3.

Install Oracle in Linux prompt ORA-27123 error when creating database, check various information, finally confirm for Kernel File Value configuration error, delete/etc/sysctl. replace the following content with all the original content of the conf

The first three paradigm of database design is that the independent table structure must have a unique primary key to identify the table data.SQL Server (duoOn the platform. Manually encode the primary key in the table and set it as an

1. Link storage to ensure that the operating system can discover devices 1 2. Change the properties of the storage device file Chown grid: oinstall/dev/mxxxxx 3. Ensure that the disk discovery path of the ASM instance includes the newly added

Regular Expression Function (10 Gb introduced)Regexp_like ('s ', 'Re', 'O ')S string or column expression to be searchedRegEx contentO parameter (optional)Idle> select ename from emp where regexp_like (ename,'s

1. The logminer usage log file stores all the data for database recovery and records every change in the database structure, that is, all DML statements for database operations. The logminer tool can be used to analyze online logs or offline log

The getToken function of SQLite3 is used to determine the Token in the SQL statement and return the length of the Token. Some basic tokens (such as operators and parentheses) are placed in lengthy Switch... case. The judgment on keyword refers to

1. Create a simple project environment in Oracle1) create a tablespaceSQL> create tablespace dreamtry_tbs datafile 'd: \ oracledate \ dreamtry_tbs01.dbf 'size 100 M;The tablespace has been created.2) create a userSQL> create user dreamtry identified