Database Administrator

Oracle 10 Gb provides a way to use external tables to extract data. First, you need a directory (here we will continue to use the previously created directory) SQL> showUser USERIs"SYS" SQL>Select*FromDba_directoriesWhereDIRECTORY_NAMELike '%

1. After logging on to Oracle, enter the following command: [Oracle @ localhost ~] $ Vi. bash_profile 2. Add from # huzia. #. Bash_profile # Get the aliases and functions If [-f ~ /. Bashrc]; then .~ /. Bashrc Fi # User specific

Impact of/dev/shm on Oracle 11g: ORACLE introduced an Automatic Memory Management feature from the 11g version. This feature requires more shared Memory (/dev/shm ), therefore, if you decide to apply this feature, make sure that the shared memory is

First, you must first have the Python MySQL connection module MySQLdbIt has been installed by default in CentOS 5.4, but not in Ubuntu. You need to manually install it as follows: : Http://sourceforge.net/projects/mysql-python/ An example that can

Stored Procedures, functions, triggers, tables, etc. In PL/SQL: Export: Tool --> Export user object --> select multiple user objects to be exported, and select the path of the output script file (SQL file) --> export. A. SQL script file is

Some people said that they would first delete a user and then create the user. I want to delete all tables under this user, but do not delete others. 1. query all tables under this user: Run the command under this user (no result, because it

Principle of a master-slave ConfigurationMysql Replication is an asynchronous Replication process, from one mysql instance (Master) to another mysql instance (Slave ), the entire replication process between the master and slave is mainly completed

This is the MySQL backup script of cainiao-level O & M. I wrote it here to take notes, and I got to know two gadgets: mysqldump/pdumpfs. The first part is mysql Data Backup. [Root @ localhost ~] # Mkdir-p/usr2/backup/mysql [Root @ localhost ~] # Vi

1Method1 [Oracle @ rhfour test] $Strings control01.ctl 2Method2 Connected: Oracle Database 10g Enterprise Edition Release 10.2.0.1.0-Production With the Partitioning, OLAP and Data Mining options   SQL>Alter database backup controlfile to trace as '

I am reading the Oracle 10 Gb documentation today and have noticed Irreversible Compatibility. Starting with Oracle Database 10g, the COMPATIBLE initialization parameter becomes irreversible; that is, it cannot be set to a value that is less than a

Today, I encountered a listener startup problem. The problem was that there was no problem when Oracle was installed on the original machine. After the machine name was changed, the listener could no longer be started, the problem is located due to

In Oracle, if you want to view the current date and time, use select sysdate from dual; So is there a system table like dual in oracle in db2? The answer is yes at the time, that is, sysibm. sysdummy. The schema of the front edge must be added;

1. Connect to the database: Cx = sqlite3.connect ('database. db'). cx is a database connection object and has the following operations: Commit () -- transaction commit Rollback () -- transaction rollback Close () -- close a database

Due to the recent increase in business volume, the growth rate of tablespaces has become very fast, and customers have begun to worry about the growth rate of tablespaces. Therefore, we also raised the need to monitor the growth of tablespaces on a

Measure the test taker's understanding about the operations in a table in El. Goal: Learn about table creation and modification and related operations. Preface: Oracle: The table is created in the user solution, rather than directly belongs to the

Oracle single table stream replication is completed. Due to the many steps of oracle stream operations, many problems have been encountered before, Failed because I did not clarify my thinking or did not understand this. For important tables, stream

1. The Assigned primary key is generated inside the database without Hibernate intervention. 2. hilo requires additional database tables to save the Historical Status of the primary key generation. 3. increment maintains a variable in the instance

1. Install the compiling environment 1 yum install gcc gcc-c++ autoconf automake ncurses-devel 2. Download and decompress 1 wget http://mysql.mirror.tw/Downloads/MySQL-5.1/mysql-5.1.45.tar.gz 2 tar

Functions of several views, from official documentsV $ sqltextV $ SQLTEXTDisplays the text of SQL statements belonging to shared SQL cursors in the SGA.V $ SESSIONV $ SESSIONDisplays session information for each current session.V $ wait_chainsV $

Lab Purpose This experiment allows the students to master the basic usage of simple query statements and the specified alias methods, and create and execute SQL scripts. Lab requirements (1) master the basic use of SQL * Plus (2) understand the