Database Administrator

The file backup system does not guarantee data integrity, especially data errors caused by software problems, which cannot be identified by the backup system. In recent years, my important data has been well preserved, and in the past few years, a

This article uses two methods to solve this problem when I often encounter password loss when I use Oracle. One method: sqlplus "/ as sysdba"SQL>startupSQL>alter user system identified by root123;

Some experience in using MYSQL services, mainly from the following aspects: MYSQL service planning and design.1. versatility of MYSQL service installation/configuration;2. Easy system upgrade and data migration;3. fast backup and System

Oracle's data export utility is an important part of the entire backup policy. You can use this tool to restore data from a single data table, which is difficult for conventional data file-based backup.However, as the number of databases and

In the most recent project implementation, Oracle network problems were encountered, which were found during the redflag HA switchover test. Although I found the oracle network configuration file in my personal exploration, I don't know how they run.

This article provides answers to some questions about the coredump command.1. Ensure that the directory where coredump is stored exists and the process has write permission on the directory. The directory that stores coredump is the current

Try{ResultSet rs;Class. forName ("com. mysql. jdbc. Driver ");Connection conn = DriverManager. getConnection ("jdbc: mysql: // localhost: 3306/test", "root", "root ");// Database name test username root Password rootStatement stmt = conn.

Install MySQL5.0.37 in Linux using the following three packages:MySQL-client-community-5.0.37-0.rhel3.i386.rpmMySQL-server-community-5.0.37-0.rhel3.i386.rpmPerl-DBI-1.53-2.fc7.i386.rpm (The following steps require root permissions)1. Verify that

1. Installation and Environment SettingsI installed MySQL5.0 + MySQL-Front3.2 + mysql-connector-java-3.1.14The default setting is used.I am mainly used to support JDBC (put the mysql-connector-java-3.1.14-bin.jar under the JDK directory \ jre \ lib \

The logrotate tool is a log rollback program that comes with the Linux system. It is started by the cron program of the System Planning Service tool and can be used to roll back various system logs. Due to the rapid growth of Oracle listener logs,

-- SQL batch delete all field description attributes in a specified data table -- Symptom: Execute select * from sys. extended_properties where value is null. Multiple records are displayed, similar to [1 OBJECT_OR_COLUMN 2372069 1 MS_Description

Lab 1,[Oracle @ even ~] $ Mkdir-p/u01/cfbck Set automatic backup of control files: RMAN> configure controlfile autobackup on; Using target database control file instead of recovery catalogOld RMAN configuration parameters:Configure controlfile

If the index and table are placed in the same tablespace, please use alter table move with caution. This will change the index to UNUSABLE. Procedure: SQL> alter table TEST_COURSE MOVE;The table has been changed.SQL> set time on;09:28:48 SQL> alter

Based on the database log structure changes, Oracle GoldenGate obtains incremental data by parsing the source online logs or archiving logs, and then applies these changes to the target database, this allows you to synchronize data between the

Select username, default_tablespace from dba_users order by username You must have dba permissions. 1. view the user's default tablespace name You must know your login user name, right, Log On With sysdba. Sqlplus/as sysdba Select username,

Aggregate functions, multiline functions, and grouping functions are all types of functions.Group by and HAVING Group function: AVG \ SUM \ MIN \ MAX \ COUNT \ STDDEV \ VARIANCEUse DISTINCT in combination with the group FunctionProcessing of NULL

Oracle backup, recovery of single or multi-table data steps, applicable to Oracle 8, 9, 10. * Back up single or multi-table data: Exp user/password @ server file = filefullpathname log = logfullpathname tables = (tablespacename. table1,

First look at a conversation: Cainiao asked: I set local_listener = 'listener1' In the parameter file, and an error is reported when the database is started. SQL> startup ORA-00119: invalid specification for system parameter LOCAL_LISTENER ORA-00132:

An Oracle 11g database is installed on a Windows server. After running for a period of time, a ORA-12537 error suddenly occurs and the application cannot be connected. Check the alert. log file and find the following error message: Fatal NI connect

A Chinese Character occupies several bytes in Oracle, which is determined by the character set encoding in Oracle. View character sets on oracle server Select userenv ('language') from dual; If the following figure is displayed, a Chinese