Oracle

drop table book; --CREATE TABLE BookId varchar2 (4) primary key, name VARCHAR2 ( -) ); --Creating a sequence Create sequence book_seq start with1Increment by1; --creating a trigger Create or replace trigger Book_trigger before insert on book

Oracle Linux 6.3 has been released for nearly 2 years, its features have greatly improved, enhanced KVM, file volume online RESIZING,LVM support RAID4, 5, 6, support more virtual CPUs and more memory, specifically, refer to Oracle official

The permission system of Oracle database is divided into System permission and object permission. System permissions (Database system privilege) allow the user to execute a specific set of commands. For example, the CREATE TABLE permission allows a

function function: This function converts a string to an array of glyph subscripts. This function can be used to determine whether a font has a glyph in itConsole code:#include "stdafx.h"#include #include "stdio.h"void Main (){Char ch[] = {' 0

1. A data dictionary is a set of read-only system tables created and maintained by an Oracle server that stores information about databases and database objects. Data dictionaries fall into two main categories: base table and data dictionary viewThe

1 Definition:           Hierarchical query using tree traversal, go through the data collection with tree structure, to get the tree hierarchical Relationship report method           Tree-structured parent-child relationship, you can control the

Basic conceptsNested Loop join:Each row in the Outer table joins the corresponding record in the inner table, similar to a nested loop.Sort Merge Join:Sort the two tables before you join.Hash join:The smaller of the two tables constructs a hash

DG has the following three modes–maximum Protection–maximum availability–maximum Performance Under maximum protection, you can guarantee that the data from the library and the main library is exactly the same, so that the zero-data loss is done. The

View the lock table process SQL statement 1: Select Sess.sid, sess.serial#, lo.oracle_username, lo.os_user_name, ao. object_name , lo.locked_mode from v$locked_object lo, dba_objects ao, v$session Sesswhere ao. object_id =

All below actions should is executed with "Oracle" user account1. Check The status of listener$ LSNRCTL Status2. If the listener isn ' t be started, start it$ lsnrctl Start3. Set the "ORACLE_SID" environment to the DB instance's SID which you want

INSTR(Source string, target string, start position, match ordinal)In Oracle/plsql, the InStr function returns the position of the string to intercept in the source string. Retrieve only once, that is, from the beginning of the characterEnds at the

1. PhenomenonEngineering for Spring+mybatis+xfire,webservice Engineering services, the implementation of interface data functions2. Repair methodAfter a variety of attempts:1. Re-deploy the project without fruit2. Redeploy Tomcat without fruit3.

SELECT a.table_name English name,A.tab_comments Chinese name,a.column_id serial number,A.column_name English name,A.comments Chinese name,B.primary_key primary KEY,substr (A.data_type,1,instr (A.data_type, ' (')-1) data type,Case when substr (A.data_

1. Table and Data Recovery 1. Query the deleted table from the Recycle BinSelect Object_name,original_name,partition_name,type,ts_name,createtime,droptime from RecycleBin;2. Execute the table's recovery statementFlashback table TableName to before

1. Create user and specify table spaceCreate User by gy_3004 default tablespace gy_3004_data temporary tablespace gy_3004_temp; 2. Grant permissions to users--Way One:GRANT CREATESESSION,CREATE any TABLE, CREATE any VIEW,CREATE any

1 Creating a userCreate user @username identified by @passwordExample: Create user Aobama identified by futureA user named "Aobama" was created, and the user's password is "future".Note: The Create user in Oracle requires Administrator (DBA)

1 giving someone "system privilege"Sql> Grant connect to Aobama with admin optionThis means that the admin's connection database permissions are assigned to "Aobama", and "Aobama" can assign this permission to others2 questions about granting

Synonyms and sequences of PL/SQL Basics PL/SQL: a programming Language combined with a Structured Language (Structured Query Language). It is an extension of SQL and supports multiple data types, such as large objects and Collection types, you can

Since no relevant instructions are found in the official documents, the following tests are conducted here to find the retry time rule for oracle Database jobs that fail.Database Version: 11.2.0.3Test Description: A log table and procedure with

Before 11g, You need to manually maintain the partition. After 11 GB, interval is used to implement automatic expansion of partitions, which simplifies maintenance. By YEAR: INTERVAL (NUMTOYMINTERVAL (1, 'Year '))By MONTH: INTERVAL (NUMTOYMINTERVAL (