Oracle

Background:A table suddenly appears query very slow situation, cost 100+ seconds or more, seriously affect production.Original sql:Explain plan for SELECT * FROM (select ID id,ret_no retno, From_sys fromsy, To_sys Tosys, Command_code Commandcode,

When the SQL statement executes, it produces a consistent read.What is logical reading? The CPU reading these blocks in memory is called a logical read (consistent get), and the IO generated during the reading process is the logical IO. During the

Oracle Data Import and export imp/exp is equivalent to Oracle data restore and backup. The EXP command can export data from a remote database server to a local DMP file, and the IMP command can import the DMP file from a local to a distant database

1,sql Types of ParseSQL Parse is usually divided into hard parsing and soft parsing, and when SQL is executed for the first time, hard parsing occurs, and then execution is performed if the shared pool Can be found in the soft analysis. Therefore,

first, there are three default users of Oracle installation complete? Sys: The owner of the database object, the highest permissions, password at the time of installation (password management) can be changed? System: Database administrator, password

1. Pricemysql: cheap (partly free): Currently, MYSQL uses dual authorization (duallicensed), which is a commercial license agreement developed by the GPL and Mysqlab. If you use MySQL in a free (open source) project that follows the GPL, you can use

#!/bin/bash# #oracle: Start/stop Oracle Database 11g r2/12c## chkconfig:345 - Ten# description:the Oracle Database Server is a RDBMS created by Oracle corporation## processname:oracle./etc/rc.d/init.d/Functionslockfile=/var/lock/subsys/Oraclepath= $

SelectOod.organization_code Inventory Organization Code,Ood.organization_name Inventory organization name,MSV. Secondary_inventory_name Sub-Inventory,MSV. Subinventory_type type,--1 = storage 2 = ReceiveMSV. DESCRIPTION description,MSV. Disable_date

Oracle Temporal tables can be said to be a good way to improve the performance of database processing, when there is no need to store , only in the Oracle temporary table space. I hope this article will be helpful to everyone.　　1. PrefaceAt present,

1. Description of the problemOracle Server power outage after the failure of the database can not connect properly, using Sqlplus envision/envision connection error. Common errors include the following: Ora-12518:tns:listener could not hand

Goal Learn how Oracle Memory management works Master the way of ASMM management Master the way of AMM management Monitor Memory usage When learning a point of knowledge, it is better to understand its history first.

/* There is a route, no BOM */Select Msi.segment1,Msi.descriptionFrom apps. Bom_operational_routings Bor,Apps.mtl_system_items_b MSIwhere msi.organization_id=yand bor.organization_id=msi.organization_idand

SELECT DISTINCTMsr.sourcing_rule_name name,Msi.description description,Msi.item_type type,Msi.inventory_item_status_code State,Msr.planning_active plan comes into effect,Msro.effective_date Effective Date,Msro.disable_date Invalid

Sequence: A sequence is a data object that can be used to generate a unique integer. is a separate object in the database, not dependent on any tables, unique to Oracle. Used to automatically generate primary key values, you can use sequence: The

Unconditional insertionInsert all in Oracle refers to inserting the same batch of data into different tables, if there is one requirement: Insert the data from the T table into t1,t2, assuming that you do not know the insert all, you may insert 2

These days encountered the system can not log in the situation, the preliminary judgment may be the database connection is full, (later check is not the reason), did an increase in the database maximum number of connections operation. Here are the

Oracle Database Compression When you hear this word, you must have thought of saving hard disk space. Yes, it is used to do this, but extending it out not only saves hard disk space, it can also save bandwidth and memory usage (cpu consumption is

References: http://www.itpub.net/thread-1714191-1-1.htmlOracleh has two server modes: shared mode and dedicated mode. In Dedicated mode, the database creates a service process for each connection request sent by the client to complete the response.

Oracle11g RAC construction in linux (6)5. Verify the root identity of the environment before installation to decompress the grid and database installation packages. [Grid @ node1 soft] $Su- Password: [Root @ node1 ~] #Cd/soft [Root @ node1 soft] #Ls

I. oracle logical architecture Diagram Ii. Logical Structure The logical structure of oralce includes: 1. tablespace 2. Segment 3. Zone 4. Block The oracle database consists of several tablespaces. The tablespace consists of several