Common Methods for viewing Oracle execution plans-Series 1: oracle execution plans
The SQL Execution Plan actually represents the specific execution steps of the target SQL in the Oracle database, only by knowing whether the execution plan selected by the optimizer is the optimal execution plan in the current situation can you know the next step.
Execution Plan
Failure phenomenon:How do I make a cold backup of an Oracle database in case of an emergency, without opening the Oracle log archive?Solution:
A cold backup of the Oracle database, sorted as follows:
When do I have to use cold backup?
1. Database mode is not archive mode
2. For field protection
The process of cold backup:
1. First view the location of the b
1, Redo Log Buffer
Redo Log Buffer is a cache of database modification information stored in the SGA. This information is stored in the Redo entry (Redo Entry). The redo entry contains the necessary information to rearrange or redo the database because of modifications made by insert, UPDATE, DELETE, CREATE, Alter, or drop. When necessary, redo entries can also be used for database recovery.
The redo entry is a copy of the Oracle database process fr
Tags: ROM editor development targe data Common password color sizeBrief introduction:It is also quite common that we often encounter the need to connect to an Oracle database when we develop our application scenarios. So so. NET environment is connected to an Oracle database and can be tns/sql.net through a configuration file, and TNS must be an Oracle client.Sce
Tags: binary ACL section src system data DML one Redolog copyOriginal address: https://www.toutiao.com/i6499008214980362765/Oracle Database Startup: The Oracle service starts, the parameter file is searched for the control file, and the control file is started, and the control file calls the data file and the log file.Oracle's file system composition: Parameter files, control files, data files, log files.1.
Tags: Oracle training Oracle Video Oracle Database tutorial Oracle Video TutorialOracle Video Tutorial Goals Oracle Video tutorial, wind Brother this set of Oracle Tutorial training learning
The Oracle database is powerful and performance-rich, and while creating these benefits, Oracle accounts for more memory. In response to this question, how do we take its essence to its dross? Solution: We can install a large Oracle database on a server within the LAN, install an Oracle client on the developer's PC, a
Restoration of Oracle databases in a hybrid framework, framework oracle
In the earlier articles, "How to Create a database in Oracle, back up a database, and export and import data" roughly introduced the backup and restoration operations of the Oracle database, this article describes the script or restoration operatio
ORACLE External table Summary, ORACLE table Summary
External table Introduction
ORACLE External tables are used to access Text files (Text files) other than databases or ORACLE exclusive format files. Therefore, when an External table is created, storage structures such as segments, partitions, and data blocks are no
Instance analysis ORACLE database performance optimization, instance analysis oracle
ORACLE Database optimization methods differ greatly from those of MYSQL. Today, an ORACLE database instance is used to analyze how to optimize ORACLE databases from tables and data.
Tsfree.
Due to historical reasons, Oracle had no Chinese character sets (such as oracle6, oracle7, and oracle7.1) in the early days. However, some users used databases since then and Stored Chinese characters with the us7ascii character set, or some users may choose a default character set, such as we8iso8859p1 or us7ascii, without any Chinese character encoding when creating a database, although this character set can be used normally in some cases, it is a
Oracle 10g 10.2.0.1 in Oracle Linux 5.4 32Bit RAC installation manual (a touch of Xiangyang), 10.2.0.1 installation manual
Oracle 10g 10.2.0.1 installation manual in Oracle Linux 5.4 32Bit rackets (step by step)
Http://download.csdn.net/detail/rlhua/7699223
How to install ORACLE
Oracle lab environment setup (Windows + Oracle 11g)
I. systems and software
Windows 7 + Oracle 11g
2. Prepare the installation environment
Prepare for ORACLE Installation
1. Delete Environment Variables
D: \ oracle \ product \ 11.2.0 \ dbhome_1 \ bin \
Note: Only some
ORACLE Experiment 2: oracle Experiment
Experiment 2: Data manipulation
Lab hours: 4 hours
Lab type: Comprehensive
Lab requirements: Required
I. Tutorial Purpose
1. Master SQL data query statements;
2. Master the use of SQL Aggregate functions;
3. Master the use of SQL insert, modify, and delete statements.
Ii. experiment content
1. Import sample data to the project procurement database based on experiment 3
Oracle's memory configuration is closely related to Oracle performance. Configuration of memory is the configuration that most affects Oracle performance. Memory also directly affects the consumption of two other important resources: CPU and IO.
First look at what the main content of Oracle memory storage is:
Program code (PLSQL, Java);
Information about the s
Write in front: In the work, the general installation of Oracle oneG client, configure Net Manager (installed client or server), remote connection to the Oracle database to meet the needs of connecting the database. If you want the machine to operate Oracle, you need to install Oracle one-to-oneG server.
a question of translation. Executes the second window first, because the query statement executes very long, at this time to execute the first window, the discovery can be inserted successfully , so it can be proved that even in the serialization mode, the query operation will not block the insert operation. Systems that meet the following characteristics are suitable for use with serialization isolation (serializable isolation): ? Data is large, but transactions are short, only databa
Label:Free installation of Oracle clients using PL/SQLThe Oracle client is annoying, and deploying a connection to it usually requires the client to install it, and the installer requires the registry to be written on the target machine, assuming you're not a neat freak, you could still be stuck with something like this: when other programs on your machine rely on x64 's
This article describes how to install Oracle 11gR2 (11.2.0.3) in Oracle Linux 6.3 ). Since Oracle 11g, the official Oracle website does not provide a download link for its Patch. You need to use the Meatlink account to download the Patch. Do not worry about the kids shoes. If you do not have a Metalink account, you can
Oracle experiences 1 -- oracle introduction @ basic SQL statement @ conditional query @ sort data theory and case studies1. Oracle IntroductionOracle is the first word for English translation of oracle (Oracle bone inscriptions) Unearthed from Yin.
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