Oracle

With the rapid development of information technology, the continuous development of enterprise information construction increases the number of enterprise business systems. At this time, data interaction between business systems, data interaction

If the connection pool is used in Oracle, "physical connections + logical connections" is displayed in V $ session ". You can use the following query to distinguish between connection pool connections and non-connection pool connections: --

ORA-27101: handling of shared memory realm does not exist errors   ORA-01034 and ORA-27101 error messages when trying to connect to the database, it always displays such information, ORA-01034-Oracle not available" ORA-27101-shared memory

Take oracle users as an Example 1. log on to the system with an oracle user2. Create the Backup Directory mkdir backup3. write the script/Oracle/backup. sh:Export $ ORACLE_HOME =/Oracle/APP/product/9.2.0;Export $ oracle_sid = orcl;Export $ Path = $

when I first learned Oracle, I first thought rownum is a mechanism similar to the top keyword of sqlserver-at least we can use this mechanism for the most common paging. this is not the case. "null" is very important in learning, and previous

In a QQ group, I saw a person learning about the overview and learning plan of the hardware abstraction layer (HAL) of Android during his android journey. When I encountered a problem, I went to the workshop.ArticleToday, I will give you a

Today, I finally got started with Oracle, the legendary Database System of niucha! There are many problems. Let's focus on two points. First, if it is Windows 7, the installation process may encounterProgramThe problem of abnormal termination is

Learning Oracle is a long and arduous process. If you are not interested but forced to learn, it is difficult to learn well. To a certain extent, if you want to further improve your knowledge, you have to get in touch with a lot of things outside of

1. Grant the select permission of one user to another user (executed as sys ): Select 'Grant select on Cisco. '| table_name |' to Chen; 'from all_tables where owner = upper ('cisco '); Authorize all tables under a Cisco user to the user Chen.   2.

Lowercase letters to uppercase letters: Upper (); Uppercase to lowercase letters: lower (); String truncation function: substr (STR, A, B ); A, B is an integer, STR is a string, Truncates string 'str' from 'A' and searches from the right to the left

According to the description in oracledocument, V $ sysstat stores the resource usage of the entire instance (instance-wide) from the moment the database instance runs. Similar to V $ sesstat, this view stores the following statistics:1>. Event

  Alter diskgroup diskgroupname rebalance power 1   Alter diskgroup diskgroupname rebalance power 2 ... ...   Alter diskgroup diskgroupname rebalance power 11     Use this clause to manually rebalance the disk group. AutomaticStorage Management

Today, I installed Oracle 10.2.0.1 ON THE rhel5.0 32bit operating system. Record it.     The following information is transferred from: Http://space.itpub.net /? Uid-16396821-action-viewspace-itemid-678471 Thanks to the original author. An error

When installing oracle on Linux, the following errors are often reported: You cannot use the command/usr/x11r6/bin/xdpyinfo to automatically check the display color. Check whether the DISPLAY variable is set. You can use the following command to

The Oracle 12C proxy is part of the enterprise management Cloud Controller, which enables you to manage and convert host hosting in the enterprise system. Proxy is a target software running on a host that integrates plug-in, monitoring, and

Conclusion 1:OracleLock table and unlockSelectS. username,Decode (L. type, 'TT', 'tableLock', 'tx ', 'row lock', null)Lock_level,O. Owner,O. object_name,O. object_type,S. Sid,S. Serial #,S. Terminal,S. machine,S. program,S. osuserFromV $ session S,

When I accidentally executed the left outer join query of Oracle 9i, I found some incredible problems. I will post them here to discuss with you. Create tables and records to simulate the current situation: Create Table temp_test1 (A number

Before writing a program, you need to implement the function of querying the tablespace usage in the database. Although you do not know the significance of doing it, you have to do the project requirements. I wrote one and can only find permanent

Parallel Processing generally involves disk access. If data is not distributed across multiple disks, using PEO will cause I/O bottlenecks. Using parallel operations in small tables or very fast queries reduces performance. When the degree of

Oracle was installed yesterday, And PLSQL developer was installed today, which cannot be connected. PLSQL developer is a 32-bit Oracle database that cannot recognize 64-bit data. Solution: Download instantclient-basic-nt-11.2.0.2.0 bit client,