Oracle

Environment:Oracle Database 11g Enterprise Edition Release 11.2.0.2.0-64bit ProductionCentOS Release 6.5 X64Symptom: System CPU usage reaches 75%, viewing system process resource status.650) this.width=650; "src="

Developed using the Entity Framework 6.x Code-first method in OracleLast year, I wrote a simple learning note for EF, when EF did not support Oracle's Code-first development model, and today has no intention of looking at Oracle's official website,

– Reference article: http://www.oracle.com/technetwork/issue-archive/2014/14-sep/o54plsql-2245345.html–sample DATAStore Name Merchandise SalesA APPLE 3000A BANANA 2000B APPLE 5000B Melon 100–construct PackageCREATE OR REPLACE Package P_nested_array

1:oracle Query The total number of messages sent per day for a certain period of timeSelect Tab.tday,(select COUNT (1) from T_msgsendrecode m where trunc (m.sendtime) = To_date (Tab.tday, ' yyyy-mm-dd '))From (SELECT * FROM (Select To_char

The following is an introduction to Oracle's Basic Profile, which describes the operation instructions for the database.Sql*plus Common CommandsConnection Command1, Conn[ect]Usage conn username/password @ NETWORK SERVICE name [as Sysdba/sysoper]

Oracle User Rights Management methodsys;//system Administrator with the highest privilegessystem;//Local Administrator, sub-high privilegescott;//Normal user, password default is tiger, default unlockedsys;//system Administrator with the highest

1. Start the Oracle database:Switch from root to Oracle user access:Su-oracleEntering the Sqlplus environment, the Nolog parameter indicates no login:Sqlplus/nologLog in in Administrator mode:Sqlplus/as SYSDBAStart the databasestartup;Stopping the

Oracle Grouping and rollup simple testingSql> SelectDEPARTMENT_ID,sum(Salary) fromEmployeeswheredepartment_idinch(Ten, -, -, -) GROUP by department_id Order bydepartment_id;department_idSUM(SALARY)------------- ----------- Ten 4400

[Email protected] database]$./runinstallerStarting Oracle Universal Installer ...Checking Temp space:must be greater than MB. Actual 38232 MB PassedChecking swap space:must be greater than MB. Actual 3999 MB PassedChecking Monitor:must is configured

Subquery: Includes another query within one query.Normal subquery--Find out information about all employees who are higher than 7654 salary SELECT * from emp e where e.sal > (select Sal from emp where empno = 7654);--query out the wage ratio of 7654

transferred from: http://www.cnblogs.com/lovemoon714/archive/2012/02/29/2373695.html1. Why should I use the package? A: In a large project, there may be many modules, and each module has its own procedures, functions and so on. And these procedures,

1. Oracle 's replace function and translate functionThe Replace function is substituted at the string level, corresponding to the string one by one substitutionSql> SELECT REPLACE ('accd','cd','EF ' from dual; REPLACE ('ACCD','CD',' EF')-----------

Recently, because of the need to create a lot of similar data, so studied the Sqlloader this tool.This tool is very helpful for a large number of data insertions.Specific usage:Frequently used keywords:UserID-ORACLE Username/passwordControl--Control

Password security and resource Management view the current profile information:SELECT * from Dba_profiles order by 1;Password management style:Failed_login_attempts PASSWORD 10---Specifies the number of failed attempts to log on to a user account

for DBA , the database Job again familiar, because often to the database automatically execute some scripts, or do database backup, or do data extraction, or do database performance optimization, including rebuilding indexes and so on. However,the

1. If you have permission to delete a user, you can:Drop user user_name cascade;Add the cascade can delete the user data.Delete and then create the user. --Create Admin user user name identified by password default tablespace space_data (tablespace

In the company often use the Oracle analysis function, in statistics this piece of useful, especially complex SQL query, I am here to combine the network some information to summarize, hope can help everyone:Oracle Analytic functions--List of

Instructions for using Oracle function ListaggAt work, customers often come up with the requirement that they want to enumerate the dates one by one in a summary merge., the original data is this:Customers want to be able to achieve such a summary

Roll Forward (Rollforward):When the database is closed, many of the submitted data is not written to disk.When the data is restored, the log content is replayed on the file, and the file is restored to the state when the database is closed.Rollback (

Materialized view is a more characteristic of Oracle, since Oracle9i, the application is very extensive, unlike MySQL, does not support the native materialized view, with the help of flexviews to achieve. What is the use of materialized views? To