Oracle

Load balancing is to increase the overall performance by allocating the load evenly to each node in the cluster. Oracle RAC provides two ways to achieve load balancing, the following is a detailed introduction, the need for friends can refer to the

The following is a detailed analysis of the use of DBMS_METADATA.GET_DDL in Oracle, the need for friends under the reference DBMS_METADATA.GET_DDL () is used to get the DDL for the object, as follows. Note: In Sqlplus, to better demonstrate the DDL,

Most people will go to check whether the archived directory is full, and use the archive directory to determine if the archive space is full, but I don't think the method represents the actual situation, and what you see may be a superficial

When monitoring, diagnosing and dealing with database performance problems, time information is often a very important basis for judgment. Sometimes we might use some scale to judge performance, but using scale rather than time tends to lead us in

--structure of PL/SQL Declare --declaring variables and constant keywordsV_name Nvarchar2 ( -); V_ageinteger;--General Variable DeclarationV_product Table_name.column_name%Type--Life variables according to the Type of table fieldV_CON constantint:=

--Printing output positive integers from 1 to 10DECLAREV_i Number (10): = 0;BEGINLOOPV_i: = v_i + 1;Dbms_output.put_line (v_i);EXIT when v_i=10; --or v_i>9;END LOOP;END;--an even number of printouts from 1 to 10DECLAREV_i Number (10): = 0;BEGINLOOPV_

1. Copy the table structure and its data:CREATE TABLE Table_name_new as SELECT * from Table_name_old2. Copy only the table structure:CREATE TABLE Table_name_new as SELECT * from Table_name_old where 1=2;Or:CREATE TABLE table_name_new like Table_name_

--Create a new temporary log file ALTER DATABASE add logfile Group 4 ('/u01/app/oracle/oradata/orcl/redo04.log ') size 10m; ALTER DATABASE Add logfile Group 5 ('/u01/app/oracle/oradata/orcl/redo05.log ') size 10m; ALTER DATABASE Add logfile Group

Similar indexof usage _instr functions in Oracle[SQL] does not have a indexof () function in Oracle but provides a InStr () method for specific usage: Select InStr (' Baoding Nanshi District ', ' City ', ' 1 ')-from dual; Explanation: 1. ' Baoding

Performance testing sometimes need to analyze the execution of SQL, to identify the need to optimize the Sql,oracle database to provide a good database status and SQL performance monitoring platform, the database monitoring platform can always

A colleague creates an instance on Oracle 10g, and at the end of the page, an error pops up, prompting for a failed listener. View the service without generating a listening service. So I deleted it, tried it several times, and so on.It's really

Today do bootstrap treeview, require input Node ID ID, parent node ID PID, textBut the SQL aliases executed are all uppercase, so the question of how to find the next ORCL alias is lowercaseThe code is as follows:Select t.fun_id "pid", T1. fun_id id,

Oracle system table QueryOracle queries all tables under the userSELECT * FROM All_tab_comments--Query All users ' tables, views, etc.SELECT * FROM User_tab_comments--Query the user's table, view, etc.SELECT * FROM All_col_comments--queries the

AWR in Oracle, all known as Automatic Workload Repository, is an automated load repository.AWR is one of the key tools for DBAs to understand the state of their operations, and the AWR report provides an overall understanding and targeted

--The date data type is still obtained after interceptionSelect Trunc (sysdate) from dual;--2017-03-13 00:00:00Select Trunc (sysdate+1) from dual;--2017-03-14 00:00:00 plus one daySelect Trunc (sysdate, ' yyyy ') from dual;--2017-01-01

First, user1. Create userCREATE USER QIGX identified by TIGER;The QIGX here is the account number, Tiger is the password.2. Assigning PermissionsGRANT connect,resource,dba to QIGX;CONNECT: temporary user; RESOURCE: a more reliable and formal user;

Use Plsql to create a user and authorize (graphical interface) Log in to the database with the SYS user (or have DBA authority [not yet know the exact difference, but can use]) Locate users in the list of objects on the left, right-click

Tool: PlsqlSteps:Log in to Plsql, open the table, then click Tools--Export user objects, select the exported content to specify the export location, OK650) this.width=650; "src="

1. Write the program to list the required columns than direct write select * More intuitive. In this way, the performance of row data retrieval is the same, and the performance of column data retrieval is improved; When you select the required

A total of 7 services, the meaning of these seven services are:1. Oracle ORCL VSS Writer service:oracle Volume Mapping copy write service, VSS (Volume Shadow Copy service) enables the creation of high-fidelity point-in-time images for storage