Database Administrator

For some current releases, three dynamic performance views are available for DBAs (Database Administrator, Database Administrator) and developers, namely V $ SQL, V $ SQLAREA, and V $ SQLTEXT.These views can be used to collect statistics about SQL

There are many ways to export data from SQL to mysql. This article introduces a graphic interface that uses SQL and mysql without programming.A Simple Method for importing and exporting data.The premise is that you have installed the sqlserver

This article provides a summary of the SELECT statements in the MySQL database. The basic syntax of the SELECT statement in MySQL is: SELECT [STRAIGHT_JOIN] [SQL_SMALL_RESULT] [SQL_BIG_RESULT] [HIGH_PRIORITY]

You do not need to reinstall the system, because I have experienced it once. The specific solution process is as follows: on that day, after redoing the system, I installed it again. install Oracle9i. my Oracle installation disk has been copied to

If you have any better requirements and suggestions, please leave a message.#! /Bin/bash# Mysql autobackup shell# Write by loulancn # 163.com# ------------------- User name and password related to the database, database name to be backed up, backup

[Oracle @ test2 ~] $ Sqlplus/nologSQL * Plus: Release 10.2.0.1.0-Production on Sun Jan 21 12:01:35 2007Copyright (c) 1982,200 5, Oracle. All rights reserved.SQL> conn/as sysdbaConnected.SQL> r1 * select program, count (1) from v $ session group by

1. Delete the SQL installation directory under Program files (back up important data first) C: \ Program Files \ Microsoft SQL Server \ 80 \ Tools. C: \ Program Files \ Microsoft SQL Server \ MSSQL. 2. Delete ExceptionComponents: HKEY_LOCAL_MACHINE \

Bkjia @ LINUXIDC11> create table seg_test (x int primary key, y varchar2 (20 )); Table created. Bkjia @ LINUXIDC11> select owner, header_file, header_block, bytes, blocks, extents from dba_segments where segment_name = 'seg _ test '; No rows

User Management Use the orapworcl file (under $ Oracle_HOME/dbs) to verify remote user login. after removal, you cannot log on remotely (that is, you cannot use sqlplussys/sys123 @ lcro to log on ), however, local login is not affected. This file is

In Oracle development, the conditional expressions between if and then are full of "art" and require us to discover and appreciate them. Appreciation 1: Three-value Logic If an expression contains a null value, what is the final result of the

Silent Installation of Oracle without graphical interfacesSome machines do not have graphical terminals. We can use the silent installation provided by Oracle to install Oracle at the prompt, and this does not require too many resources. The setting

-- Group by job_id and then by manager_idSelect job_id, manager_id, sum (salary), count (*) from employees group by job_id, manager_id; -- Group job_id first, output the result of status grouping, group by job_id, group by job_id, and group the

Partition index summary: I. Partition indexes are divided into two types:1. global, it must be Prefix. Non-prefix does not exist2. local, which is further divided into two categories:2.1. prefix: the first column of the index is equal to the

Back up and restore the Oracle database in Java. I don't know if there are any better methods. I hope some of them can also provide the following methods or code. Package com. servlet. util; Import java. io. File;Import java. io.

1. Use the sys account to create a database connection The installation of Oracle 11g will bring a tool called SQL Developer. It has very powerful functions and has never been known before. It also uses plsqldev and navicat to connect to the

Lab Environment 1. Create a linux Virtual Machine RedHat5.0 system under vm8 2.10201 _ database_linux32 Database Lab Purpose 1. Master the manual Oracle database creation   OK. Why do we need to create a database manually? A: Because DBCA databases

To make up for the limitations of nested loop connections, that is, when the data volume is large, to reduce the number of random reads in nested loop connections, and when the connection column does not have an index, nested loop connections can be

Symptom: the job is always running, and the extraction is always running. The log record in the process is located because the data of the X system is always stuck. However, the SQL statement being executed does not have any results. The data

Environment:OS: Oracle linux5.6DB: oracle11gR2 PS3RAC node: rac1, rac2 Symptom:When you create a database and copy a data fileOra-19504: failed to create file "+ DATA"......Ora-15055: unable to connect ASM instanceOra-27303: additional information:

What is Transaction First, extract a Wiki definition of Transaction (Transaction: A transaction comprises a unit of work performed med within a database management system (or similar system) against a database, and treated in a coherent and reliable