Oracle

First, the optimizer basic knowledgeBefore Oracle executes a SQL, it first analyzes the execution plan of the statement and then executes the execution plan. The execution plan for parsing statements is performed by the optimizer (Optimizer). In

Oracle Database Preinstallation Task Check hardware requirementsThe system must meet the following minimum hardware requirementsMemory requirementsMinimum:1 GB of RAMRecommended:2 GB of RAM or moreTo determine the RAM size, enter the following

Some random numbers are often generated during testing, and for this reason, Oracle provides dbms_randomThis package to produce random numbers is very useful. Under the summary below:This package has several functions such as initialize (), seed (),

N times after the test, the final proof, the following procedure, can be installed perfectly.The middle is not with any one mistake!!! Perfect!dhclientVI/etc/Profile LLCD/etc/apt/MVsources.list Sources.list.bakgrepDeb Sources.list.bak

This document describes how to synchronize Oracle table data to hive with the ODI.1. Preparatory workInstall Oracle Big Data connectors on each node of the Hadoop cluster, as shown in the following components:Just install Oracle Loader for Hadoop

Environment:SOURCE side: oracle12.2 ogg for Oracle 12.3Target side: KAFKA ogg for Bigdata 12.3Synchronizing data from Oracle to Kafka via OGGSource-side configuration:1. Add additional logs for the tables to be synchronizeddblogin USERID [email

Oracle Gold Technical Services for customers include:1. Telephone Service (7x24)Hotline Support Phone 800-810-008124 hours a day, 7 days a week, the Beijing Technical Support Center is staffed every day. To ensure timely communication with customers.

Before you use ODI, you must create a repository. The creation process is as follows:1. Environment variable Setting2. Using RCURCU is a usage program that creates a repository.[email protected]:~$ $ODI_HOME/oracle_common/bin/rcuDefault entry,

The main steps used by SQL Tunning Advisor:1 Setting up Tunning task2 Execute Task3 showing tunning results4 Follow the recommendations to run the appropriate tuning method----Advisor Authorization1 creating tasks based on SQL textFUNCTION

Environment Description:#主库RAC环境#备库RAC环境, operating system AIX 6.1 database version 11.2.0.3Error Description:#主库备份控制文件, transfer to Repository, restore errorThis document is divided into two stages: First stage: Error occurred, query related

(1) Select the most efficient table name order (valid only in the rule-based optimizer):The Oracle parser processes the table names in the FROM clause in a right-to-left order, and the FROM clause is written in the final table (the underlying table,

1. Select the database directory*\product\10.1.0\oradata\ Directory (* indicates the installation directory of Oracle)2. CREATE TABLE SpaceFormat: Create tablespace table name datafile ' data file name ' size table space;sql> Create tablespace

1. Colleague feedback log in without reporting errors when logging into the latest oracle12.2 database:2. Remember to check the data, Oracle increased the encryption level of the client connection database in 12.2 earlier Oracle client such as 11.2.0

I. BACKGROUNDThe company's business uses the Oracle database, because multiple occurrences of the table space can not be found in time, each time is the business group of Personnel notification processing, so that the DBA side is relatively passive,

For more information about the use of ORACLE time functions (SYSDATE), oraclesysdate Addition Select sysdate, add_months (sysdate, 12) from dual; -- add 1 year select sysdate, add_months (sysdate, 1) from dual; -- add January select sysdate,

Oracle SQL uses with recursive analysis (for example) and oracle Recursion The WITH recursion provided by Oracle is not just a repetition of tree-like queries. In fact, recursive WITH statements can provide more flexible tree-like Query

One way for oracle12c to manage job resources: oracle12c job resources Database: 12.1.0.2, rac, cdb Mode   I am responsible for moving two cdb clusters of 12.1.0.2, one on aix and the other on linux. Unfortunately, they are both hybrid and have more

Summary of simple SELECT query statements in SQL, and SQL SELECT query statements -- Scott users cannot use it. Use system to log on-- Modify scott account to unlockAlter user scott account unlock;-- Reset the password identified to be

Common oracle knowledge accumulation and oracle knowledge accumulation1. Basic operation 1. Table operation 1.1 copy and create a table Create table test as select * from dept; -- copy data and structure from a known table Create table test as

Oracle rman backup tutorial, mongolerman backup Oracle rman backup tutorial Rman must be in oracle archive mode to check whether the database is in archive state. Enter archive log list in the command line of the oracle database. First, close the