Oracle

Second, materialized view(a) What is materialized viewA view is a virtual table (which can also be considered a statement), based on the result set returned by the query statement that was specified when it was created. Each access to it causes this

First, decode functionMeaning explanation:1, Decode (condition, value 1, return value 1, value 2, return value 2,... Value N, return value N, default value)The function has the following meanings:IF condition = value 1 ThenRETURN (translation value 1

Oracle rows and columns convert column names if they are numbers, enclose the following in double quotation marks:--Build a tableCREATE TABLE Workinfo(WID Integer PRIMARY key,Sid Integer,CONSTRAINT SID foreign Key (SID) references student (SID),City

Today in order to modify the database configuration, the sga_max_size set to 20G, but Sga_target did not change, still for 10G results after the restart of the database will not start, reported ORA-00821 error ora-00821:specified value of Sga_target

Usually we use EXPDP to derive sequence in two ways:Small batch:Include=synonym: "In (' AAA ', ' BBB ')----This does not enter the schema prefixSCHEMAS=LYCH,LYCH01----Here just export the top two sequence under schemas. But the problem with a very

1. Install Plsql DeveloperOracle database and PL/SQL Developer installation steps, here do not narrate, Baidu installation method when you say in the installation of PL/SQL developer software, do not install in program Files (x86) directory,

A lot of friends have encountered in the operation of the database mistakenly delete some important data, if the database is not backed up and the data is very important how to do to retrieve the data mistakenly deleted? I am here to introduce

The attentive little companion could find that we were in Gv$pdbs, and did not find con_id=1,con_id=0In fact, if you take a careful guess, you should be able to guess:Because CDB is made up of root container,seed pdb container,0 or multiple PDB

1. Query the data at the point in time at which the data was deleted (that is, data that was flashed back to that point)SELECT * from gt19 as of TIMESTAMP To_timestamp ('2017-12-21 18:30:00'yyyy-mm-dd HH24:MI:SS' )WHERE='c9309c3427e04c8982cd56a25

First way: Export a database using Plsql1. Open Plsql, find the toolbar, export the table 22. Go to the Export homepage, select the folder, enter the name of the export file, click Save 33. Click the Export button to eject the Export data

The examples in this article describe Oracle trigger usage. Share to everyone for your reference, as follows: First, Trigger introduction trigger definition When a condition is set up, the statements defined in the trigger are automatically executed.

Today I found the database connection is very slow, even can not connect, want me to check to see#su - oracle$ lsnrctl statusLSNRCTL for Linux: Version 11.2.0.1.0 - Production on 17-MAY-2018 12:29:11Copyright (c) 1991, 2009, Oracle. All rights

1. INDEX RANGE SCAN--Please remember this index RANGE scan scanning methoddrop table T Purge;CREATE TABLE T as select * from Dba_objects;Update T set object_id=rownum;CommitCREATE index idx_object_id on T (object_id);Set Autotrace traceonlySet

includes: Oracle Database in Windows installation and configuration under the operating system, python The third-party expansion packs that need to be installed, as well as sample learning for basic operations. Oracle Database

Requirement Description: Requires that the Windows the database instance name of the platform is determined by ORCL Change to

Original address HTTP://BLOG.ITPUB.NET/24099965/VIEWSPACE-1116923/1, creating, deleting create sequence seq_newsidincrement by 1start With 1maxvalue 999999999; Gets the sequence of SQL statements select Seq_newsid.nextval from sys.dual; Delete

After we install the Orabbix plug-in, look at the Tablespaces monitoring item is the hair item value is None, the first reaction is not monitoring success, not actually.1, we open the path of the ORABBIX monitoring key parameter, the following is

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As shown in the following formula, 2015 to the current year (2018) of the annual range, the current year is obtained by the system, using the sysdate and function to_char,to_date.Of course, the current year can also be replaced by a specified

Use data pump technology for logical backupsLogical Backup OverviewA logical backup is the process of creating a logical copy of a database object and depositing it into a binary dump file. Essentially, logical backup and recovery is actually the