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
Oracle-Oracle user management 1. Oracle Installation Default User Username Password user description SYSCHANGE_ON_INSTALL user has SYSDBA or SYSOPER permissions; All Oracle data dictionaries base tables and views are stored under SYS users. The SYSTEMMANAGER user has the NORMAL permission. the user is used to store lev
How to use Oracle to conveniently view alarm log errors and oracle logs
I checked the information on the Internet for a few days and tried to clear the alarm log Content and create an external table to solve this problem.
I. Back up and clear alarm logs
Back up the daily alarm logs and clear them.
1: Back up alarm logs
Under the $ ORACLE_HOME/SID/bdump/directory,Back up the file alert_ORACLE _ your instance
How to permanently delete an Oracle database to create a database with the same instance name and an oracle instance
I chose the OMF method when creating the database today. The result file name is automatically named in Oracle. I cannot understand it, so I decided to delete it and recreate it.Oracle provides the command to delete a database: drop database.The da
When 64-bit Oracle 10g is installed on Oracle Linux Server Release 5.7, the following problems are encountered:
Error in invoking target 'install' of makefile'/u01/app/oracle/product/dbhome_1/ctx/lib/ins_ctx.mk '.
See '/u01/app/oracle/oraInventory/logs/installActions2014-01-11_12-44-52PM.log' for details;
As follows:
What is the Oracle database shutdown and startup command ?, Oracle commandsPreface
Log on to sqlplus with sysdba and run the following command.
On windows, the background processes that constitute instances in oracle are implemented by threads derived from the oracle service, therefore, the task manager cannot see back
/Tmp/. oracle,/var/tmp/. oracle What should I do if it is deleted?
The official documents are described as follows:
3 Installing Oracle Grid Infrastructure and Oracle Real Application Clusters
Caution:
After installation is complete, do not remove manually or run cron jobs that remove/tmp /.
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
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