Database Administrator

Since the Oracle data format is different from the general microcomputer format, Oracle data cannot be directly called. Although Developer 2000, a front-end development tool provided by Oracle, can access Oracle data and has data access interfaces,

Oracle clients often need to be installed during program creation. If there are many client terminals, this will be a very troublesome task. On the one hand, we need to arrange our applications, on the other hand, it is difficult to install the

It is often used in the NT environment to convert a MySQL database to an SQL Server database or to a MySQL database. After using MySQL ODBC, you can use the SQL Server 7 management tool or the MySQL management tool. You can also use other management

In practical applications, for paging or query performance requirements, we often need to query records with a fixed number of rows from the database. Different databases have different SQL statements. In Oracle databases, we can use the following

After a whole day, finally solved the problem of jdbc (mysql-connector-java-5.0.30) and mysq communication Chinese garbled! My system is linux (Ubuntu ). Use hibernate to connect to mysql in java (Myeclipse environment. There is no problem in

The following method can be used to solve the garbled problem:1. Set phpMyAdminLanguage: Chinese simplified (zh-utf-8)MySQL Character Set: UTF-8 Unicode (utf8)MySQL connection verification gbk_chinese_ci2. When creating a databaseSet it to

Mysql can be connected to the web through PHP in two ways, one is mysql-related functions through php, and the other is ODBC-related functions through php. The related functions are as follows: MYSQL Functions Mysql_affected_rows: obtain the number

Environment: Operating System: SUSE Linux9 Database: Oracle10gR2 1. Change host [Root @ www ~] # Hostname Linux [Root @ www ~] # Hostname test11 [Root @ www ~] # Hostname Test11 [Root @ www ~] # 2: Try to restart the listener Oracle @ linux:/>

In many cases, we need to terminate all Oracle processes ). When the database is "locked" and you cannot enter Server Manager to terminate the database, you can use the kill command in UNIX to terminate all Oracle processes. This is one of the

Write down some important knowledge about Oracle databases for future reference! I. file systems and functionsExecution file: the Core of the Oracle system. data files can only be identified by Oracle processing programs. it is meaningless to leave

Today, the development database has created an index online for more than one hour. An error is returned when an index is deleted after it is forcibly canceled. Re-create the index will tell you that the index already exists, drop index will tell

System: LINUX 5.6-64Database Version: 11.2.0.2The following error occurs during Automatic SQL tuning of Oracle:Thu Jan 10 22:00:02 2013Begin automatic SQL Tuning Advisor run for special tuning task "SYS_AUTO_ SQL _TUNING_TASK"Thu Jan 10 22:02:39 2013

The customer has reported this error since using nbu. Because it has always been normal. So we stopped the nbu backup at night. Use the previous script separately. The error message is the same. Therefore, I doubt whether it is a script problem.The

When you use start with connect by nocycle prior When performing recursive data search So the performance of the following two sections of code must be significantly different when you use it, please note that the code can be directly read below to

Oracle logs include online redo log and archived log. Online redo log:A database must have at least two groups of redo logs, and each group of redo logs must have at least one member (for security reasons, we recommend that each group of redo logs

The ORA-06502: PL/SQL: Number or value error: string buffer is too small when a stored procedure is found and the long type returned by the function is too large Long variables in PL/SQL can only store 32768 bytes (32 K)Clob is recommended Hi,I 've

Table Creation Oracle includes five constraints, including primary key constraints (primary key, the value of this attribute cannot be blank, and cannot be repeated. By default, this column is automatically indexed) and foreign key constraints

SQL * Plus: Release 11.2.0.1.0 Production on Mon Feb 18 15:42:14 2013 OS: Linux node 2.6.32-200.13.1.el5uek #1 SMP Wed Jul 27 21:02:33 EDT 2011 x86_64 x86_64 x86_64 GNU/Linux Due to application requirements, some user passwords cannot expire, and

Oracle online logs and Oracle archive logs record the complete change information of the entire database. Is an important part of Oracle architecture. Therefore, online log planning is also very important. However, as the business grows or the

Oracle Auto-start configuration in Linux (I) modify the value of/etc/oratab to Y. [Root @ Rocky ~] # Cat/etc/oratab Orcl:/u01/app/oracle/product/10.2.0/db_1: Y (Ii) Modify ORACLE_HOME_LISTNER of dbstart to point it to $ ORACLE_HOME [Root @