Oracle

An Oracle database trigger is a named PL/SQL statement block stored in a database that is implicitly executed when the triggering event occurs, and the activity that executes the trigger is called the trigger trigger.A particular user in a

We know that Oracle's statistics will seriously impact the CBO's choice of execution plans, and it is important to make collection rules for tables of different sizes and perform them on a regular basis. Oracle collects statistics using the

If the time value read from Excel is a null value, do the following conversionsString YDKGSJ = String. Empty;if (dbdata. Rows[i]["agreed to start time"]. ToString () = = ""){YDKGSJ = "null,";}Else{YDKGSJ = "To_date ('" + convert.todatetime (dbdata).

Because it is the Oracle 11g free version, not installed Oracle client, and then from the Internet to find a free client-side use of PL/SQL tutorial, specifically can see the link, here is no longer a statement; but when you open PL/SQL, the client

Create directory gives us the flexibility to read and write files in an Oracle database, greatly improving the ease of use and scalability of Oracle.Its syntax is:CREATE [OR REPLACE] Directory directory as 'pathname';This case is specifically

1. Download Instantclient-basic-win32;2. Unzip and place it under the product folder of the Oracle installation directory of the native database, such as my directory:3. Configure Environment variables:Add these system variables to the system

Network topologyOtdadmin 192.168.3.101Node1 192.168.3.201Node2 192.168.3.202 Virtual IP 192.168.3.200System version;olinux6.4Turn off firewall chkconfig iptables offService Iptables StopTurn off SELinuxVim/etc/selinux/configSelinux=disabledInit

1, installation jdk1.8(1) Download oracle-java8 via Apt-get, first of all,Add a PPA source, equivalent to adding a software warehousesudo add-apt-repository Ppa:webupd8team/javasudo apt-get Updatesudo apt-get Install

Oracle does not support copying the Clob/blob field data from a remote database table directly to the local database via the databases link.SQL like the following cannot be performed. (The Ipop_topic table has a CLOB field)INSERT INTO

Oracle Data Import Export IMP/EXPFunction: Oracle data import and export imp/exp is comparable with Oracle data restore and backup.In most cases, the data can be backed up and restored with Oracle data import and export (no loss of data).Oracle has

Due to database migration, the original Oracle backup file needs to be imported into the new Oracle database, EXP export, imp error, found that the string length is too long error. Find out, the original database is the GBK character set (Oracle in

"Note" I have successfully cleared the installation record of Win7 and oracle10g, referring to this article.The original text reads as follows:Software Environment:1. Windows 2000+oracle 8.1.72, the ORACLE installation path is:

Oracle Data Import Export IMP/EXPFunction: Oracle data import and export imp/exp is comparable with Oracle data restore and backup.In most cases, the data can be backed up and restored with Oracle data import and export (no loss of data).Oracle has

the following is from: Http://www.51cto.com/art/200806/76223.htm35.2 Execution Plan management35.2.1 OverviewThe execution plan for the same SQL statement may vary depending on the optimizer's version, optimization statistics, optimization

First, Oracle Foundation SQL PracticeClass table: Class number (primary key, identity column), class name, head teacher, commencement dateTeacher's Table: Teacher number (primary key, identity column), name, gender (default ' male '), Social

Using a primary foreign KEY constraint makes the data integrity.1, query all the constraints on the tableSELECT * FROM User_constraints twhere t.table_name= ' FATHER ';2. Querying tables with primary foreign key relationshipsSelect

ORACLE EBS operates on a form interface, or when a background database operates on a table and finds that it has been in "suspended animation" state, possibly because the table is locked by one user, which prevents other users from continuing the

View the Oracle Execution Plan and the oracle execution plan1. PL/SQL explain Plan window Advantages: Disadvantage: limited information2. explain_plan It is easier to optimize a sentence.3. sqlplus Run the following command in Sqlplus: Set

How to use Oracle External tables to import data from text files, oracle Text Files Recently, colleagues are busy with Data Consistency comparison. They need to compare the data in different text files. Some files are large and have many records. If

Oracle442 application scenarios ---------- basic application scenarios   /// // Basic knowledge //////////////////   Application Scenario 178: the simplest select statement SELECT * FROM Employees; Use Case 179: Specify the column to be queried COL