Oracle

In an Oracle database, setting ID auto-increment is not as simple as MySQL, and a sequence needs to be set in Oracle.Now give the way, specifically as follows:First step: Create a tableCREATE TABLE Contestdb ( TID number () PRIMARY KEY,

SELECT * from Sh_gonghuo_renyuan as of timestamp to_timestamp (' 2017-11-17 16:00:00 ', ' yyyy-mm-dd hh24:mi:ss ');--3, recovering deleted and committed dataALTER TABLE Sh_gonghuo_renyuan enable row movement;--flashback table Sh_gonghuo_renyuan to

Premise:1, please be sure to install Oracle at win at least 5 times.2. Be sure to master the basic Linux commands.Prepare the Oracle linux64-bit installation package (official download of 2 compressed files)Ready virtual machine VMware and Linux

Today the Data group someone response website can not open normally, after checking Oracle database remote connection is not on, message: Ora-00257:archiver error. Connect internal only, until freed. Maybe the archivelog is full . Before learning

1 Create or Replace functionWork_plan_mask (P_schemaVARCHAR2, p_tableVARCHAR2)2 3 return Varchar2 as --data control, specifying that certain people can only view information within their purview4 5V_predicateVARCHAR2( +) := '1=2';6V_personcode

1 First modify the/etc/oratab file to add the following line:Ycr:/u01/app/oracle/product/12.1.0/dbhome_1:yAn explanation of the/etc/oratab file is as follows:# This file was used by ORACLE utilities. It's created by root.sh# and updated by either

#!/bin/sh#start Mutli Oralce Instance#create by Zwy#date 2017-10-25Port_cnt= ' Ss-lnp|grep 1521|wc-l 'if (($port _cnt {Lsnrctl Start &Port_cnt= ' Ss-lnp|grep 1521|wc-l 'while (($port _cnt Do{Echo ' Ora lsnrctl is not running 'Lsnrctl Start &Port_cnt=

Select table_name from User_tables; The current user's tableSelect table_name from All_tables; All users ' tablesSelect table_name from Dba_tables; including system tablesSelect table_name from dba_tables where owner= ' user name

Oracle Notes (14) User managementSQL statements are divided into three categories: DML, DDL, DCL, before the DML and DDL have been explained, now the DCL operation, DCL mainly represents the database control statements, control is the operation of

(+) in Oracle is a special usage, (+) represents an outer join, and is always placed on the side of a non-primary table.For example, left OUTER join:Select A.A,B.A from A left JOIN B on a.b=b.b;Equivalent toSelect A.A,B.A from a b where a.b = b.b (+)

3,000,001 tables of data, using cursors to cycle, different ways of efficiency comparison of 3,000,001 table data, using cursors to cycle, different ways of efficiency comparison  1, display cursors  declare    cursor cur_2 is Select A.cust_name

The "problem" now has two tens other structures of the same data in different data tables T_sms_phoneno (destination table), T_sms_phoneno2 (source table), updating the data of the destination table based on the source table data."Analysis" based on

Previously obtained Oracle database backups are typically DMP files, creating tablespaces and users directly using IMP or IMPDP import.This time I encountered a special situation, the other side of the data provided to me is the use of Sqlplus

First, create a table: CREATE TABLE Example ( ID Number (4) Not NULL PRIMARY KEY, NAME VARCHAR (25)); Then, customize a sequence (sequence): CREATE SEQUENCE example_sequence INCREMENT by 1--add a few each time

With the popularity of Oracle database, the problem of how to optimize Oracle database is always in the Oracle database for DBAs, with the increasing amount of data and the increasing of traffic and concurrency.In general, Oracle database operations

1, unzip the file 10201_database_win32.zip, and double-click the Setup.exe directory, the installation interface appears as follows:2, enter the password and confirm the password, such as:password, click Next, the following progress bar appears,Note:

Oracle generates non-repeated ticket numbers and LPAD, RPAD and NEXTVAL function parsing, and lpadnextval SELECT TO_CHAR (SYSDATE, 'yymmdd') | LPAD (REFUNDSEQ. NEXTVAL, 6, '0') AS RES_ORDER_NO FROM DUAL The statement splicing time is consistent with

Solution for failing to open the entire database due to accidental deletion of pdb data files in oracle 12c, 12 cpdb Preface Recently, a colleague accidentally deleted the data files of a plug-in Database (PDB), and the results showed that the

Methods and precautions for using forced indexes in Oracle, oracle Indexes Oracle forced Index In some scenarios, ORACLE may not automatically take the index. In this case, if the business is clear, you can try to use a forced index to test the

Oracle uses Dblink and oracle uses dblink The DBLINK database link is a schema object in a database, allowing you to access objects in another database. The dblink qualifier allows you to reference objects in a database other than the local database.