Oracle

The most basic of Oracle database data objects are tables and views, and others are constraints, sequences, functions, stored procedures, packages, triggers, and so on. The operation of the database can be basically attributed to the operation of

Scan conceptLet's start with what is called Scan,scan (single client Access name), which was launched by Oracle from 11g R2, and the client can load-balance connections to the RAC database via the SCAN feature. Scan provides a domain name to access

How to view the current session information for OracleHow do I see the current number of connections to Oracle? Just use the following SQL statement to query it.#查看当前不为空的连接SELECT * FROM v$session where username are not null#查看不同用户的连接数Select Username,

Source: http://blog.csdn.net/liverliu/article/details/6410287First: The cause of the problem, I previously in the f:/llh/directory created a bookspace table space, and later do not want this table space, so I deleted directly, this error is because

Cause: The default oracle10g Scott cannot log in.Solve:(1) Conn Sys/sys as sysdba;//logged in as DBA(2) Alter user Scott account unlock;//then unlock(3) Conn Scott/tiger//Popup A Password Change dialog box, modify the password can beThe following

createtime--2017 June 1 14:36:37Author:marydonOne, SQL statements(b) Promotion1.2.1 Left connection + paged querySituation: the class table and the student table are related to each other, query the student information and the classMethod One: Use

/*the historical version of the SQL statement SQL89 comparison SQL92 SQL99 multi-Table association query Cartesian product equivalent correlation query Non-equivalence correlated query left outer connection right outer connection full outer

This article is suitable for UF NC, UAP series products. Other cases are for reference only.Cut the crap and start getting to the point:Steps:--Create TABLE space--data and index must be paired.CREATE tablespace nnc_data01 datafile '

It seems that some people still do not understand the true meaning of the schema, and now I have to tidy up a bit, I hope to help you.Let's start by looking at their definition:ASchemais a collection of the database objects (used by a user.).Schema

Method One: Use the PL/SQL Developer tool to export: Menu bar---->tools---->export Tables, for example, set the relevant parameters: Method Two: Using the cmd Operation command to export, Details are as follows (note: Method Two is reprinted on-line

DMP tables Import and export from Oracle databaseImport: Start-to-run input cmd enter# #语法格式为: Imp username/password @ip address/database name file= ' dmp file path ' full=yC:\users\administrator>imp Testuser/[email PROTECTED]/ORCL file='C:\Users\

internal and external connections in the 1,oracle1, internal connectionThe internal connection is that the qualifying data is selected and the data that is not eligible is filtered out.1,1,1 equivalent ConnectionFirst look at the "s_emp" table

1. ODBC jar package required for Oracle2. Code3. Note: PS objects and statement objects are best used for immediate release, especially when the read-write database code appears in the FOR Loop statement.Otherwise, there will be insufficient cursors,

2.8 DD Specifies the day ordinal of the month (range: 1-31)SQLSelect To_char (sysdate,'from dual; To_char (sysdate,'DDYYYY-MM-DDP ')------------------------------27 2015-12-27 pm 18:12:08 2.9 DDD Specifies the day of the Year (range:

Oracle 11g RAC DBCA to create a listener when building a libraryWhen you install an Oracle 11g RAC, you are prompted to create a listener when you use DBCA to build the library:The Default Listener "Listener" is not a configured in Grid

Stored procedures with no parameterssql> Create or replace procedure Get_time is2 begin3 Dbms_output.put_line (sysdate);4 End;5/Procedure created.sql> exec get_time;15-may-17PL/SQL procedure successfully completed.Stored procedure with in

The network Adapter could not establish the connection the networking adapter cannot create a connectionAs a beginner, this problem let me find several times, each time you turn on the computer can be normal access to connect, after a while, I do

Available with three Oracle clients: SQL Developer, pl Developer, Navicat PremiumI. SQL Developer (Oracle's Own)Download and install SQL Developer, the connection is simply not said.:

Query Recycle Bin content, greater than - you need to clean upSELECT count (1) from Dba_recyclebin;Clean up all contents of the Recycle BinPurge Dba_recyclebin;Querying all Table spacesSELECT ' result= ' | | Df.tablespace_name "Tablespace",

Sometimes we use the same name as the Oracle keyword when we define field names and aliases, so how do we handle them?It's really simple, just add "" To this keyword, like "group"Sql>DROP TABLE k; Table dropped--CREATE table K, field named UID