Oracle

1), per minute executionExecute every MinuteTRUNC (sysdate, ' mi ') + 1/(24*60)Executes every five minutesTRUNC (sysdate, ' mi ') + 5/(24*60)2), hourly executionHourly executionTRUNC (sysdate, ' mi ') + 1/24Executes every five hoursTRUNC (sysdate, '

------------I do not have him, but the hand is ripe, humble and foolish, and eager to be hungry-------------DDL operations:-- Create student tables CREATE TABLE Student (Sno Number (4) is not NULL,Sname VARCHAR2 (Ten) NOT NULL,Birthdday Date);-- Add

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

This article organizes the concepts and operations of partitioned tables from the following aspects:1. Table space and the concept of partitioned tables2. The specific role of table partitioning3. Advantages and disadvantages of table partitioning4.

Usermod-g oinstall-g dba-d/home/oracle Oracle-G is the Oinstall group for the specified user's primary group-G is the DBA group for the specified user's secondary group-D for the specified user's home directorystatement is defined in detail to

--Oracle's data typeThe common database field types are as follows:Field type chinese description restriction conditions Other descriptionCHAR fixed length string max length bytesVARCHAR2 length of string maximum length 4000 bytes can be indexed up

For everyone to share a case of SQL optimization we encountered, the case is not my own responsible database, I am just a porter.This case occurred last year, discovered because the Nets host CPU rose, the development operation found the DA, then

Reason:because there is no commit,oracle to lock the record when Plsql developer executes the update. can be resolved by querying the lock record first SQL code select S.sid, s.serial# from V$locked_object Lo, dba_objects ao, v$session s WHERE

Oracle 11g Dataguard suspend log transfer for physical standbyCategory: Oracle2017-07-18 10:03:17These two days the production end of the log produced too much lead to the recovery of the archive log directory full of the phenomenon, after clearing

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1. IF syntaxIF expression then ... END IF;For example:Set Serverout ondeclare v_name varchar2: = ' &name '; begin if V_name= ' Kiki ' then dbms_output.put_ Line (' login successful '); End if;end;/--------execution results as follows---

Reprinted from: 6105327The FLASHBACK drop feature allows you to restore a specified table to its deleted point in time without losing any databases and keep the database in its current state. Flashback deletion is notInstead of actually deleting the

Problem: Dataguard cannot apply redo Log,alert without any error message.Symptom: Oracle RAC node alert has no error message and the other section reports the following errors.Thu Mar 15 15:26:22 2018Error 1017 received logging on to the

In database maintenance, backup or recovery is the most serious issue. Although database systems are slow to run,but for the loss of database data, obviously the cost of the latter is self-evident, DBA the first job isis to do everything possible to

Oracle client-to-server communication mechanismAfter the Oracle product installation is complete, both the server and the client need network configuration to enable network connectivity, server-side configuration listeners, and the client to

In this tutorial, you will learn how to use the Oracle LIKE operator to test whether a value in a column matches a specified pattern.The Oracle Like operator describesSometimes, you want to query the data according to the specified pattern. For

Methods for Oracle to implement String concatenation and separation functions (WM_CONCAT function), oraclewm_concat String Aggregation Techniques, or assemble the handler of each link in the process into a string. There are multiple methods to

Auto re-indexing and re-Indexing 1. shell script method Index_re.shSqlplus/as sysdba Spool/tmp/I. SQL repSelect 'alter Index' | owner | '. "' | index_name | '" rebuild;' from dba_indexes where owner = 'Scott 'and status = 'unusable ';Spool offHo

How to operate an oracle database dumplogfile ?, Oracledumplogfile This article explains how to get a dump in an online or archived redo log file. Constraints and restrictions: 1. The database must be installed (or opened ). Changing the system

Introduction to Oracle Stored Procedure instances and oracle Stored Procedure instances This document introduces the stored procedure through the imported table. The difference between stored procedures and functions is that functions can only be