Oracle

Scenario: There is a table A on the remote Oracle, and a table B with the same table structure exists locally. Due to the fact that a few records from the business system operation were saved in the table B, and some of the records in a were

Today in a visit to an old project, the background error prompts Oracle account locked, has always been able to access the normal, do not know why this problem occurs, Baidu for a reason is probably multiple landing failure caused, the general

Generally after writing import oracle.jdbc.driver.*; Statement, you will find an error. At this point you need:First, add the JDBC driver to the ClasspathTwo different methods.  One is graphical, computer-Properties-Advanced settings-Environment

. NET Connect to Oracle Methods Mode 1: Direct use. NET Oracle-driven connectivity Reference System.data.oracleclient; Using System.data.oracleclient; String oradb = "Data source=water; User Id=modis; Password=modis;integrated Security=no ";

sql> CREATE DATABASE LINK mydblink2 CONNECT to test identified by test1233 USING ' (DESCRIPTION =4 (address_list =5 (ADDRESS = (PROTOCOL = TCP) (HOST=192.168.1.210) (PORT = 1521 ))6 (Connect_data = (service_name = ORCL)7 )8 ) ';Database Link created.

Application: Connect Oracle, normally install Oracle client on native, but Oracle software is too big and bloated, so the lite version of Instantclient is born.1,: http://www.oracle.com/technetwork/topics/winsoft-085727.html2: Decompression,

As long as there are more than two tables associated with the query, it will return a Cartesian product, the database will remove those redundant data, only return useful data. We use the left connection and the right connection when the query will

Some of the Oracle functions are organized below-higher-order articles:1, CatstrExample: SELECT catstr (column_name) name_list from Dba_tab_columns where TRIM (table_name) = ' t_rz_dkdata '--the result of the query is in a column2. INSTR ()

One, character functionsThe character function is the most commonly used function in Oracle, so let's see what the character functions are:Lower (char): Converts a string to a lowercase format.Select lower (' AAAA ') from dualInStr

we use Jdbcdaosupport in spring to insert data into MySQL and return the primary key code, we use the MySQL database, the primary key is set to self-growth in the database: The class inherits from Jdbcdaosupport , so you can use Getjdbctemplate

Yesterday, colleagues said there is a set of RAC cluster customer requirements to modify the database listening port, in the process of processing, found that the relevant information on the Internet is not very comprehensive, so tidy up a bit, I

numeric functionsABS (N): Used to return the absolute value of the number nCeil (N): Returns the smallest integer greater than or equal to the number nFloor (N): Returns the largest integer less than or equal to the number nMoD (M,n): Returns the

1. Download and install the Cx_oracle installation packagePython Operations Oracle database, the first need to install the Cx_oracle package, as follows:http://cx-oracle.sourceforge.net/Http://sourceforge.net/projects/cx-oracle/files/5.1.2/The

Install the database client. This can be downloaded and installed on the Oracle website (download link) Install PL/SQL pl in download Configuring environment variables (This is more important, do not configure Plsql links to the database)

oracle11g new Feature SPMhelps keep SQL statement attributes, allowing only performance-enhancing execution plans to be performed.Unlike the stored outlines, the SPM is designed to stabilize SQL performance while the store outlines freezes the SQL

1 Install Oracle 10g on HP UNIX, this does not explain, install directly.Create group OINSTALL,DBA, user Oracle[Email protected] ~]# Groupadd Oinstall[[email protected] ~]# Groupadd DBA[Email protected] ~]# useradd-d/home/oracle-g oinstall-g dba

Environment Note: The SID for Oracle Instance 1 is ORCL (the default boot instance), the second instance has a SID of Orcl2 boot step: 1) When the database instance is started, start the database listening service #lsnrctl start2) switch to the

Linux shell under svnserve-d-R + Directory For example: svnserve-d-r/svn start svn service.Access the SVN://192.168.0.120/KJCG test.Start Oracle:First, how to start the db instance1. Go to Sqlplus launch instance [[email protected] ~]$

1. First need two jar package Jxl.jar,ojdbc.jar (note version, version inappropriate will report version error)2. Code:Java code Import Java.io.File; Import Java.io.FileInputStream; Import java.io.IOException; Import Java.io.InputStream;

Execute the following statement "to modify the data type, the column you want to change must be empty"ALTER TABLE name modify (Target Field VARCHAR2 (100));Steps to resolve:The first step is to add a temporary field to the tableALTER TABLE name add