Oracle

When you execute a SQL statement very slowly, do you want to ask Oracle how to execute this statement?Oracle provides sql_trace tools to let you know exactly what SQL you are doing. The process of execution isOutput to the trace file.The following

Oracle 11.2.0.2 bugs are still a lot of.Many libraries have encountered problems after relocating to Oracle 11.2.0.2.Questions on the two Oracle 11.2.0.2 that are now being followed:1.ora-00600:internal error code, arguments: [Ktecgsc:kcbz_objdchk],

I. Overview　　1. What are views (view)　　　　views The logically related collection of data (which is a virtual table) extracted from the table.　　2. Why use a View1. Control access2. Simplify your query　　3. Classification of views　　　　Second, view

1. View the installation version of OracleSqlplus/nolog (executed in cmd)2. View current logged in userShow user (performed in Sqlplus from the following line)3. View the maximum number of Oracle connectionsSelect COUNT (*) from v$process;4. View

/*----------------------------------------------------------------------------*/Question 1[--------]Select t.* from v_t04_product_m t where T.pcode = ' c02-422 ';Select t.* from v_t04_product_m t where T.pcode = ' TEST08 ';Pcode c02-422 pid is

I. Querying all rows and columns in a tableSecond, from the table Search Department BranchThird, find the null valueD. convert null value to actual value (COALESCE)V. Find rows that meet multiple criteria (10 of all employees in the query department,

Table space usage includes: View table space name and size/view table space physical file name and size/view rollback segment name and size and so on, you can refer to this articleSQL1:Copy CodeThe code is as follows:--1, view the name and size of

The linux&oracle of Evil and supplementary articlesLinux simultaneously Open two terminals:ctrl+shift+tLinux configuration Yum file:/etc/yum.repos.d/xx.repoLinux switch users:su-usernameOracle Connectivity:sqlplus/as sysdba;conn/as sysdba;Grid to

Background:On the same Linux server, there are two database users, namely: Database1,database2, how to database1 all the tables and data below the user, import into the Database2 database (Database2 for the newly created user, No table created, is

Client Environment parametersNls_lang = Language_territory. Character_setDescription is as followsParameter DescriptionLANGUAGE Specifies the LANGUAGE and conventions for displaying messages, day name, and month name.TERRITORY Specifies the

Description Table functions can accept query statements or cursors as input parameters, and can output multiple rows of data.The function can be executed in parallel and can continuously output data streams, which are called piped

When it comes to query theory, you first need to know the architecture of Oracle. The database service consists of two parts: an instance and a database file. The examples section includes the SGA (System Global area) and the PGA (Progam Global Area)

Early use of Linux, look at the Oracle listening state and port is just a glance, did not seriously read the content is also the English hint, a few load new pick up Oracle,WinDOS cmd to view listening status find lots of interesting questions,

Syntax for adding a field: ALTER TABLE tablename Add (column datatype [default value][null/not null],....);Modify the syntax of the field: ALTER TABLE tablename modify (column datatype [default value][null/not null],....);Syntax for deleting a field:

Introduction to 1.Oracle databases What is the difference between a database system and a database management system?parsing: Database system = Database management system +oper+ operator + hardwareOracle Database management systemCore products of

Installing Oracle-database-server-12cr2-preinstallwget http://public-yum.oracle.com/public-yum-ol7.repo -O /etc/yum.repos.d/public-yum-ol7.repowget http://public-yum.oracle.com/RPM-GPG-KEY-oracle-ol7 -O /etc/pki/rpm-gpg/RPM-GPG-KEY-oracleyum clean

Recently in an OA system statistical module, there is a function need to count the daily new users and cumulative new users, only a user login table (user login time, user ID, etc.),:Analysis: 1, the same user can log on multiple times in a day, in

table spaces and data files1. Tablespace is a disk logical space for a database.2. Each table space consists of one or more data files.3. A data file can only belong to one table space.After completing the Oracle system installation and creating an

Oracle expdp/impdp Test Library Build tutorial, expdpimpdp Recently, the customer needs to build a test database, so they just need to organize their experience.I. Test Database creation: To create a database in windows, it is best to run the

Common Oracle backup commands, oraclebackup 1. Set the backup tag 1. backup database tag = 'full _ bak1 '; Note: Each tag must be unique. The same tag can be used for multiple backups to restore only the latest backups. 2. Set the backup set size