Oracle

Let's take a look at an intuitive picture:Oracle 11gArchitecture DiagramUnderstand the Oracle architecture to fully understand three concepts : database, database instance (instance), session, Be sure not to confuse these three concepts.The concept

Meaning explanation:Decode (condition, value 1, return value 1, value 2, return value 2,... Value N, return value N, default value)The function has the following meanings:IF condition = value 1 ThenRETURN (translation value 1)elsif condition = value

1. Introduction to the experimental environment                                   1.1   soa Original Database                                                                                                                                             

Oracle 10g bigfile Table Space Introduction  01. A Bigfile  table space contains a very large data file 02.  Smallfile tablespace and Bigfile table space can coexist in the same database 1. Create a bigfile tablespace     sql> create bigfile

Ali Electric Surface asked the relevant knowledge, find this article on the Internet. These keywords are query recursive data, forming a tree-like structure. Only Oracle support is available, and other data is implemented in conjunction with stored

Disk DirectoryDisk directory contains information about all the disks in the disk group. Disk directory information is more detailed than PST. Each disc in a disk group has an entry that is indexed by a number. The file number of disk directory is

Today, in Oracle's SQL plus run the delete and query operations, and then run the query in PL/SQL, the same, the result is not the same, let me feel depressed, and then suddenly thought may be on both sides of the data inconsistency caused, but why

Once the Oracle database runs in accordance with the design goals, the database can be truly operational. The database operation marks the beginning of the basic completion of the development task and the Oracle maintenance work, but does not imply

recently encountered a requirement to migrate data from a subset of the tables in Oracle to a SQL Server database. But the structure of these tables is somewhat different. method one, using the SQL Develper Data Export tool, export the SQL INSERT

Situations in which Direct Path Load are not usedIf any of the following conditions exist for a table, then Data Pump uses external tables rather than direct path to load The data for that table: A global index on multipartition tables exists

1. Generate a single-instance AWR report:@ $ORACLE _home/rdbms/admin/awrrpt.sql2. Generate the Oracle RAC AWR report:@ $ORACLE _home/rdbms/admin/awrgrpt.sql3. Generate an AWR report for a specific DB instance in the RAC environment:@ $ORACLE

COLLABORATE 14–shoug Forum Shanghai Oracle User Group 2014 Summit registration This event is organized by Oracle ACS Advanced Services and Shoug Shanghai Oracle user.The General Assembly's agenda includes: ACS Phys, Bao Guanglei, "Common

1. The optimizer (Optimizer) is an optimization tool for SQL analysis and execution that is responsible for making the SQL execution plan, which is responsible for ensuring that SQL performs the most efficiently, such as determining how Oracle

Students who write SQL often should be exposed to some of the Oracle's datetime functions, such as financial software or human resources software that is counted annually, quarterly, monthly, or even every week.Today is nothing to do, deliberately

5 Installing Oracle[Email protected] ~]# cd/temp/ [[email protected] temp]# ls linux.x64_11gR2_database_1of2.zip Lost+found Yum Linux.x64_11gR2_database_2of2.zip pdksh-5.2.14-37.el5_8.1.x86_64.rpm [email protected] temp]# unzip

1, through the PPA this installation mode features: 1, installed Java with JDK, JRE and browser plug-in 2, automatically identify 64bit or 32BIT3, automatically upgrade to the latest version 4, support Ubuntu 13.10, 13.04, 12.10, 12.04 and 10.04 or

At noon one day, some users reported system problems one after another, saying that the process was abnormal, the to-do list was not gone, and the to-do list could not be opened. The Maintenance Engineer began to analyze the problem. The clear

Oracle Linux 6.3 has been released for nearly two years, and its functions have been greatly improved. It has enhanced KVM, online file volume resizing, and LVM supports raid4, 5, 6, supports more virtual CPUs and larger memory. For details, refer

Analysis of effective cursor Management [Train of Thought Analysis] The cursor can be understood as a shared execution plan. When SQL is not shared, there are two common solutions: 1. Adjust the size of the Shared Pool (the shared execution plan

Cursor definition: The role of a cursor: To obtain records returned by a query. You can retrieve a record from the cursor at a time through a query. Use the cursor in five steps: (1) declare a variable to save the column value of the record (2)