Oracle

Problem Description:Implementation of Oracle automated backup scripts.Error tip 1:Message file RMAN.MSB not foundVerify that Oracle_home is set properly。。。。。。Cause of Error:Automatic execution does not recognize the corresponding command and

Scenario: convert [SANNANYINV] to [3 male 1 female] in the contents of the field NNDP in datasheet tb_userMain script: A cursor script + split string function + Pinyin to digital scriptThe procedure is as follows:1. Create a TypeCreate or Replace

1. Modify the login identifier and default editor (not required)Modify $oracle_home/sqlplus/admin/glogin.sql to add the following at the end of the file:set sqlprompt ' _user ' @ ' _connect_identifier> 'define _EDITOR=VI2. Create initialization

1.OverviewOracle "CONNECT by" is a hierarchical query clause that is typically used for queries in tree or hierarchical result sets2. How to use 2.1. Via Connect byGenerating SequencesOracle constructs the number of days in a monthSelectTo_date ('200

1, commonly used functions are divided into five major categories: character functions, numbers and date functions, numeric functions, conversion functions, mixed functions 2. Character functions Character functions are primarily used to modify

In Greek history, Delphi was once considered the center of the world, and Apollo killed Python and took it for himself, inscribed Oracle on its temple, Yue: γνωθιδεαυτ?ν (Know your own concern, Cognosce Te Ipsum, Connais-toi toi-même). Borland

First, lockA database is a shared resource used by multiple users. When multiple users store data concurrently, the database generates multiple transactions that simultaneously access the same data. If the concurrency operation is not controlled, it

Select Case whenTo_char (Last_day (Add_months (Trunc (Sysdate,'y'),1)),'DD')= ' -' Then 'Common year' Else 'Leap Year' End asIsleapyear fromDualThe first step: the date of the beginning of the date; the second step: the beginning

1. String interceptionsubstr (String, start_position, [length])Cases:SelectSubstr'Hello World',1,2) fromDual--The returned result is ' He ' Note: A string of length 2 is intercepted starting from the first character of the stringSelectSubstr'Hello

It is important to avoid potential data type conversions as much as possible.If you compare character data with numeric data, Oracle automatically converts the character type with the To_number () function, which results in a full table scan.Example

Silent installation of Oracle database on OEL7.0Silent installation I use less, basically do not need to use a silent installation. Even a text-mounted system uses Xmanager to redirect graphics. But there is always an exception, such as on the Mac

Data export① to fully export the database ORCLExp Lims/[email protected] file=d:lims_20150104.dmp full=y② exporting LIMs users in a databaseExp Lims/[email protected] file=d:daochu.dmp owner= (LIMS)③ to export tables in the databaseExp Lims/[email

In the Oracle default installation, a Scott user has been created with the default password: Tiger, which has four tables:Employee table (EMP), departmental table (DEPT), Payroll registration form and bonus table. Many of the next operations are

Today on the Internet to see a blog written by a netizen, feel good, general uninstall Oracle has 4 local needs note: 1) services,2) software,3eventlog,4) path.1. Turn off all Oracle services. Can be turned off in the Windows Service Manager;2.

#include #include String.h>#include #include voidMain () {Char username[Ten], password[Ten], server[10];Char name[ALL], title[10];FloatSalary printf"Input name:"); Gets (username); printf "input pass:" ); Gets (password); printf ( "input server: ");

Oracle lock 1: DML lockDML lock, also known as data lock, is used to ensure data integrity when multiple users operate on data. DML lock prevents conflicting DML and DDL operations at the same time. DML Locks include Row Locks (TX) and Table Locks

Oracle performance optimization operation 11: like clause frontend matching as much as possible Because the like parameter is frequently used, if the like clause can be indexed, the query efficiency will be greatly improved. Example: Select *

Rollup and cube of Oralce advanced SQLIn oracle SQL query, oracle provides some advanced functions to simplify SQL query statements and improve query performance. The following describes the usage and difference of rollup and cube.1. rollupRollup

Prepare and review Oracledba before hardware engineers perform storage operations Before the hardware engineers perform operations on the storage (new storage or other operations on the storage), Oracle DBAs should prepare: 1. vg information hpux:

What does cursor mean? Cursor   I. classification: Static cursor Explicit cursor (need to be clearly defined) Implicit cursor (all dml statements are implicit cursors, and for loop is also implicit cursors) Ref cursor (try not to use ref cursor. ref