Oracle

1. Startup optionsORACLE will find the initialization parameter file in the default location $ORACLE _home/dbs (unix/linux) when starting the database when the startup command is issued. Oracle will look for the appropriate initialization file in

Dedicated server and shared server1. Dedicated ServerWhen I landed, Oracle would always create a new process for me to connect to the Oracle server, so that the configured server was called an Oracle dedicated server, and the resulting server

Today in the use of PL/SQL found in the tables below a lot of bin beginning of the table, I thought is the database operation of the process of the resulting temporary table, I want to delete, but with the right-click drop, found that can not delete.

--Take the date of the first day of the one months before the current date select Last_day (Add_months (Sysdate,-2)) + 1  from dual;--take the date of the last day one months before the current date select Last_day (add _months (Sysdate,-1)) from

PackageCom.hanqi;Importjava.io.IOException;Importjava.sql.Connection;ImportJava.sql.DriverManager;ImportJava.sql.*;Importjavax.servlet.ServletException;ImportJavax.servlet.http.HttpServlet;Importjavax.servlet.http.HttpServletRequest;ImportJavax.servl

Package Javaapplication2;Import Java.sql.Connection;Import Java.sql.DriverManager;Import Java.sql.ResultSet;Import Java.sql.SQLException;Import Java.sql.Statement;Public class JavaApplication2 {public static void main (String[]args) throws

1. Stop the databasesql> shutdown immediate;Database closed.Database dismounted.ORACLE instance shut down.2. Start the databaseSql> startup;ORACLE instance started.Total System Global area 795127808 bytesFixed Size 1339456 bytesVariable Size 49493190

The process is as follows:1-Confirm the following installation package, if not installed, find the appropriate package from the CD to install#rpm-qa | grep

You've been testing your server's migration issues, creating table spaces, creating databases, and creating users. Later feel to create so many things too occupy disk space, thought to delete it, so, we executed the DBCA command, will not use the

an administrative user1Querying user CollectionsSelectUsername fromdba_users; A queries whether a user existsSelectUsername fromDba_userswhereUsername='User name'2Querying user PermissionsSelect * fromDba_sys_privswhereGrantee='User name'3Create

/* Formatted on 2013-1-11 13:23:55 (QP5 v5.185.11230.41888) */CREATE OR REPLACE FUNCTION getgiftsname (RID in number)//rid wear parametersRETURN VARCHAR2AsSTR VARCHAR2 (1000); /* The data set returned by */BEGINDECLAREV_medcode VARCHAR2 (100); /*

/*select to_char (to_date (' 2009-04-1 ',  ' yyyy-mm-dd ')  + ROWNUM - 1,                 ' Yyyy-mm-dd ')  DAY_ID   FROM DUALCONNECT BY ROWNUM  Oracle Query Month

Linux System installation Oracle Recently learned Oracle Database, the installation problem took a lot of time, online also consulted a lot of documents, at the same time, according to their own experience, summarize The installation steps of

--Go to re-query method one: based on IDSELECT * from Sxe where ID in (the Select min (id) from SXE Group by username) Order by ID ASC;--Go to re-query method two: according to RowNumSELECT * FROM (select S.*,rownum rn from SXE s) x where X.rn in

Six restrictions that can invalidate Oracle IndexesThe goal of Oracle indexes is to avoid full table scans and improve query efficiency, but sometimes it is counterproductive. For example, if a table contains millions of data records and an index is

ORACLE lag () and lead () functions, oraclelag I. Introduction The lag and lead functions are two offset-related analysis functions. These two functions can be used to retrieve the data of the first N rows of the same field in a query (lag) and the

Oracle learning notes 6 SQL common functions, oracle learning notes SQLFunction category Oracle provides a series of functions for executing specific operationsAn SQL function has one or more parameters and returns one value. The following are the

OER 7451 in Load Indicator: Error Code = OSD-04500Problem phenomenon: Today the customer runs a database for half a year remote login always hang, view the database altert log continuously reported the following Error: OER 7451 in Load Indicator:

Plsqldev, sqldeveloper, plsqldev Plsqldev connection 1. To connect to different servers, modify the tnsnames. ora file as follows: # Tnsnames. ora Network Configuration File: \ app \ usr \ admin \ orcl \ tnsnames. ora # Generated by Oracle

Common Oracle commandsToday, the database user is locked and checked, saying that the user will be locked if the logon error exceeds 10 times, therefore, with the unlock and password change operations, sqlplus/nolog is aborted without connecting to