Oracle

The SQL statements in Oracle are parsed before execution. A hard parsing includes the following steps: Load to the shared pool-SQLSource codeIs loaded into the memory. Syntax Parsing-Oracle checks for incorrect syntax spelling. Semantic

1. To show all existing groupsCAT/etc/group2. Create the oinstall group if it doesn't existGroupadd oinstall3. Create the DBA group if it doesn't existGroupadd DBA4. Create the Oracle user if it doesn't existUseradd-u 1000-G oinstall-g

RAC is short for real application clusters, which is the same as rack. Oracle Real Application Clusters (RAC) supports 24x7 effective database application systems. You can freely deploy your applications on a high-availability system composed of

Package test; Import Java. io. bufferedreader; Import Java. io. file; Import Java. io. fileinputstream; Import Java. io. filenotfoundexception; Import Java. io. ioexception; Import Java. io. inputstreamreader; Import Java. io. reader;

If you want to sort out the FAQs in Oracle, I think the row-to-column conversion problem is inevitable. Today, I used some leisure time to sort out my understanding and experiences. Before proceeding to my summary, I repeatedly thought about the

Summary of Oracle Database Development Optimization   Although the cost of hardware is already very low, the use of hardware performance can block problems caused by software performance issues to some extent, but this does not mean that the

Oracle judge whether the character type can be converted to date type ORA-01847 ORA-01843 judge whether the character type date is valid date format ORA-01847 ORA-01843 Sun Moon King blog http://sunmoonking.spaces.live.com has a user table needs to

Create or replace procedure ecs_customdetail_0929 -- create a stored procedureIsLongerstation varchar2 (50); -- defines VariablesType v_cursor is ref cursor; -- Variable-definition cursorDetailid v_cursor;In_id v_cursor;V_str varchar2 (200 );In_str

Nls_characterset = zht16mswin950 Nls_nchar_characterset = al16utf16   Select, insert nchar should use N 'hangzhou' Select * From factest where fac_uname = n' Liu Ke '" Insert into factest values ('20140901', '20160901', n'hangzhou ') 9i has a

The Oracle query date can use =, but the data types must be consistent on both sides of the equal sign, For example, '2014-9-19 'is a string that cannot be directly compared with a date field and must undergo date conversion: Convert date to

The Oracle Server maintains the redo Oracle log files to minimize the loss of data in the database in case of an uncontrolled shutdown. Online redo Oracle log files are filled with redo records. A redo record, also called a redo entry, is made up of

Database programs generally use computer memory and persistent storage devices (such as disks) for operations. The disk provides space for persistent storage and storage of a large amount of information. However, obtaining information from a disk is

Oracle tips by Burleson Consulting Oracle SGA concepts The system global area (SGA) is a group of shared memory areas that are dedicated to an oracle instance? (An instance is your database programs and RAM ). All Oracle processes use the SGA to

Oracle tips by Burleson Consulting Most DBAs know all about the Oracle system global area (SGA ). the SGA is Oracle's structural memory area that facilitates the transfer of data and information between clients and the Oracle database. long gone

Redo(Redo) In addition to the data files used to save data, each Oracle database has a set of (two or more) redo log files. Redo logs are used to save all changes to the data, including submitted and unsubmitted changes. Before writing changes to

Database development or management personnel often need to create a large amount of test data, and tens of thousands of data records are required. If one data entry is required, it will waste a lot of time, this article describes how to quickly

Sometimes a column is compared with a series of values. The simplest way is to use subqueries in the where clause. InThe where clause can use subqueries in two formats.The first format is to use the in OPERATOR:... Where column in (select * from...

In large databases, procedure is often called because of development needs. procedure is different in Oracle and sqlserver due to different syntaxes, but in debugging, is relatively difficult, especially in some error handling. First, debug: 1. For

MySQL statement Optimization Principles 1. Use indexes to traverse tables faster. The index created by default is a non-clustered index, but sometimes it is not optimal. In a non-clustered index, data is physically stored on the data page

1 Introduction The Oracle stream function is designed to improve the high availability of the database. In Oracle 9i and earlier versions, this function is called Advance replication. Oracle stream uses advanced Queue Technology to parse archived