Home
Search results “Drop oracle table partition”
exchange Partition , Move partition in oracle
 
08:42
exchange Partition , Move partition in oracle Possible operations with partitions SQL Tutorial SQL Tutorial for beginners PLSQL Tutorial PLSQL Tutorial for beginners PL/SQL Tutorial PL SQL Tutorial PL SQL Tutorial for beginners PL/SQL Tutorial for beginners Oracle SQL Tutorial Add Drop Rename Split Move ( Moving from Tablespace to tablespace) Exchange (Table to Table(non Partitioned table)) not partitioned only exchanging data (p)
Views: 934 TechLake
part 8 drop partition
 
01:18
drop partition alter table data warehousing
Partitioning in Oracle Explained with Real project Examples : Introduction
 
22:43
This Video series will explain partitioning and its use cases referencing real project examples from different domain. It will explain what when and why of partitioning in a simple but elaborate manner. This is the 1st video which explains why partitioning is required and what are the advantages we gain from it. The following videos will explain when should we do it and how.
Views: 18065 Tech Coach
Oracle Optimization - Table Partitions
 
15:07
Oracle optimization: create table partitions and Index-Organized Table. Other lessons, visit http://www.learn-with-video-tutorials.com/plsql-oracle-optimization
Oracle Database 12c: Partitioning Improvements with Tom Kyte
 
08:08
Tom Kyte introduces the new partitioning improvements in Oracle Database 12c, followed by a demo of global index maintenance. For more information: "Asynchronous Global Index Maintenance for Dropping and Truncating Partitions" http://www.oracle.com/pls/topic/lookup?ctx=db121&id=VLDBG14107 "Changes for Very Large Databases and Partitioning in Oracle Database 12c Release 1" http://www.oracle.com/pls/topic/lookup?ctx=db121&id=VLDBG14100 "ALTER INDEX COALESCE Clause" http://www.oracle.com/pls/topic/lookup?ctx=db121&id=SQLRF52782 "DBMS_PART.CLEANUP_GIDX Procedure" http://www.oracle.com/pls/topic/lookup?ctx=db121&id=ARPLS74409
Views: 12732 OracleDBVision
04 How to configure Hash partition in Oracle
 
06:56
Hash partitioning Use hash partitioning if your data does not easily lend itself to range partitioning, but you would like to partition for performance and manageability reasons. Hash partitioning provides a method of evenly distributing data across a specified number of partitions. Rows are mapped into partitions based on a hash value of the partitioning key The following example shows how to create a hash partition table. The following example creates a hash-partitioned table. The partitioning column is partno, four partitions are created and assigned system generated names, and they are placed in four named tablespaces (tab1,tab2, ...). CREATE TABLE products (partno NUMBER, description VARCHAR2 (60)) PARTITION BY HASH (partno) PARTITIONS 4 STORE IN (tab1, tab2, tab3, tab4);
Views: 750 OnLinE ReSoUrCe
MySQL Partitioning
 
16:27
In the tenth episode of 'Getting Started With MySQL' Series, we get to walk through the different types of Table Partitioning (such as RANGE, LIST and HASH) in MySQL Database. Most importantly we get some idea on what benefit we get out of partitioning a Database Table.
Views: 7718 Rajesh Rajasekharan
Oracle SQL PLSQL 12C Tutorial 5 - How to create new Table
 
08:36
This Video Tutorial Will Describe how to create a new table in oracle 12C version. This command will also work on other versions of database like Oracle 11g Database, Oracle 10g Database, Oracle 9i Database, Oracle 8i Database, Oracle 8 Database and so on. Full Syntax will be given in this video tutorial about how to create a new table in oracle database. Along with live example of new table creation . In this video tutorial we will create a new sample table. All the keywords, format, mandatory clauses etc are described in this video. As example we create new table with different datatypes and length of data that can be stored in that table. Many columns will be created that can store alphanumeric, numeric , date etc.
sub partitioning in oracle  or composite partitioning in Oracle RANGE-LIST, RANGE-HASH
 
07:24
sub partitioning in oracle or composite partitioning in Oracle SQL Tutorial SQL Tutorial for beginners PLSQL Tutorial PLSQL Tutorial for beginners PL/SQL Tutorial PL SQL Tutorial PL SQL Tutorial for beginners PL/SQL Tutorial for beginners Oracle SQL Tutorial
Views: 442 TechLake
Creating range partition in Oracle 12c - Part 1
 
11:32
Partition makes a table access faster in case of very large table. In this tutorial we have tried to demonstrate the range partition on date.
Views: 98 Subhroneel Ganguly
Frgmentation in oracle database
 
34:54
Fragmentation in oracle database,find and defragmentation
Views: 3692 Sainora Annanagar
Oracle Tablespaces
 
12:07
Oracle tablespaces
Views: 6505 Chris Ostrowski
How to Move Object from one Table Space to Another Table Space? | How to Rebuild the Index ?
 
05:03
This Video will teach you How to Move Object one Table Space to Another | How to Rebuild the Index ? move table from one tablespace to another in oracle 11g oracle move schema to another tablespace oracle how to move objects to another tablespace oracle 11g move schema to another tablespace alter table move tablespace oracle 8i oracle move table script oracle move cluster to new tablespace oracle move table example rebuild index oracle script alter index rebuild online parallel oracle rebuild all indexes oracle index rebuild online vs offline oracle rebuild partitioned index index rebuild oracle best practice index rebuild script in oracle 11g
Views: 806 Oracle PL/SQL World
Partitioning Enhancements in oracle 12c
 
08:33
Oracle has made 4 significant enhancements in 12c. 1.Mixing Interval and Reference partitioning 2.DDL operations on multiple partitions 3.Global Index maintenance 4.Cascade Operations from parent to child, Truncate and drop This video explains the enhancements in detail with practical examples
Views: 1125 Tech Coach
11 drop and recover table
 
04:11
oracle sql dovelper vedios
Views: 53 DM Bilawal
Oracle Database11g tutorials 14 : How to CREATE TABLE using sql developer and command prompt
 
08:36
Oracle Database11g tutorials 14 How to Create table using command prompt and Create table using sql developer Blog Link http://bit.ly/1TkY4Oe Time Line 0:25 Introduction of Tables in Database 1:03 What is Create Table (Introduction of create table) 1:30 Syntax of Create Table 2:08 How to create table using Command Prompt 4:55 How to create table using SQL Developer Links for Oracle Database tutorials 4: database connectivity using SQL developer and command prompt http://youtu.be/wSqoXRlXDUU You can have indepth knowledge about SQL create table here http://www.rebellionrider.com/sql-create-table.html Tool used in this tutorial is command prompt. This tutorial series is part of SQL expert exam certification training. if you are preparing for SQL certification you can use my tutorials. This SQL Tutorial is a part of free training. Copy Cloud referral link || Use this link to join copy cloud and get 20GB of free storage https://copy.com?r=j7eYO7 Contacts E-Mail [email protected] Twitter https://twitter.com/rebellionrider Instagram http://instagram.com/rebellionrider Facebook. https://www.facebook.com/imthebhardwaj Linkedin. http://in.linkedin.com/in/mannbhardwaj/ Thanks for linking, commenting, sharing and watching more of our videos This is Manish from RebellionRider.com Today in this oracle database tutorial we will see How to CREATE A TABLE. if we have to define a table in layman language then we can say that Tables are just a collection of Rows and Columns but In RDBMS tables are database objects which help in organizing data into ROWS and COLUMNS. We can also say that SQL tables are kind of data structure which are used by database for efficient storage of data. To create a table in our database we use SQL CREATE TABLE command. SQL CREATE TABLE is a type of DATA DEFINITION LANGUAGE also known as DDL. To Create a table in your schema you will require CREATE TABLE system privilege. In our future videos we will see what are system and object privileges and how to grant them to a user. Today for this video we will be using Sample schema HR which already has all the necessary privileges. Ohk Let's see the syntax. CREATE TABLE table name ( column name1 Data-Type(size), column name2 Data-Type(size), ..... ); CREATE TABLE is an oracle reserved word or say an Oracle key word whereas There are 3 different ways of creating a table in Oracle database. Creating a table using Command Line Interface (CLI) in Oracle database For demonstrating how to create table in oracle database using CLI, I'll be using Command prompt. Thats how we create table using command prompt. you can check your table structure by DESCRIBE command for that just write DESC and your table name. Like this Another way of creating a table is by using Graphic user interface (GUI) in Oracle database To demonstrate how to create table using GUI we will use SQL developer. Lets open our SQL developer I am connected to HR schema if you do not know how to create a connection to database using SQL developer please watch my oracle database tutorial 4 that explains database connectivity using SQL developer and command prompt. Link for this video is in the description below. So lets create a table. Creating a table using SQL developer is very easy we do not have to fire any query here. Let's start First of all right click on your connection in which you want to create a table and choose schema browser. This will open a separate schema browser pane or you can expend your connection by clicking this + sign and then right click on table and choose New Table. However I prefer working with schema browser so let's skip to schema browser pane here from the first drop-down list you can choose connection name and in the second drop down list you can choose what database objects you want to work with we want to create a table thus I'll choose table and then click this arrow here and choose option for new table Ok we have created a table wizard first of all give a unique name to your table and add some column as well. For this, click the green plus button. Now we already have a column so give it some name. Also choose a datatype from the list and specify any size you can check this not null column if in case you want to make this a mandatory column you can also specify default value and constraint If you want to make this column a primary key you can click here In my future video i'll show you what are these constraints and different ways of applying them on a column in a table. for this video we will concentrate on create table only so when you are done with all your columns click ok Thats your table You can double click on your table here and can see its structure. Thats it
Views: 169059 Manish Sharma
part 17 split partition
 
01:56
split partition, data warehousing, alter table
SQL Server 2008 Partitioned Table and Parallelism
 
05:45
Detailed Article for "Partitioned Table and Parallelism" is available at : http://sqlserver-training.com/sql-server-2008-partitioned-table-parallelism-concept-video Follow us at more Updates at ----------------------------------------- Website : http://sqlserver-training.com/ Twitter : http://twitter.com/dbatag/ Facebook : http://facebook.com/dbatag/ Linked In : http://in.linkedin.com/in/dbatag/ ================================ SQL Server 2008 has removed the bottleneck of single-thread per partition over partitioned tables, which was found in SQL Server 2005. The previous bottleneck can cause performance problems under certain circumstances: On systems with many CPUs, if the table schema has less partitions than there are CPUs, then not all the CPUs will be used to process the query. Some examples: On a 32-way box, a query over a 12-partition table (e.g. a sales table partitioned by month) will only use 12 threads (one on each of 12 CPUs). This means 20 CPUs are potentially idle. On a 4-way box, a query over a 12-partition table only accesses a single partition so will only use one thread (on one CPU). This means 3 CPUs are potentially idle. On tables that have skewed data such that one partition is much larger than another, the length of time the query takes to complete will be bounded by the single thread processing the largest partition. As part of the set of improvements in SQL Server 2008 for data warehousing there will be an option to change the threading behavior for queries over partitioned tables. The new, alternative model is that all available threads process part of each partition and then move into the next partition. This allows all available CPUs to take part in processing the query, which should lead to a drop in the query completion time. The Following video shows, SQL Server 2008 -- Partitioned Table & Parallelism feature and shows graphically, how SQL Server 2008 has improved performance of Partitioned Tables. Visit the following link for more details and SQL Server Tutorials http://sqlserver-training.com/sql-server-2008-partitioned-table-parallelism-concept-video
Views: 17738 DBATAG
part 12 truncate partition
 
01:55
Truncate partition, alter table, data warehousing
Dropping Oracle Database 11g Manually with Drop Database Statement
 
05:17
DROP DATABASE Purpose Caution: You cannot roll back a DROP DATABASE statement. Use the DROP DATABASE statement to drop the database. This statement is useful when you want to drop a test database or drop an old database after successful migration to a new host. Prerequisites You must have the SYSDBA system privilege to issue this statement. The database must be mounted in exclusive for RAC and restricted mode, and it must be closed. Semantics When you issue this statement, Oracle Database drops the database and deletes all control files and datafiles listed in the control file. If the database used a server parameter file (spfile), it is also deleted. Archived logs and backups are not removed, but you can use Recovery Manager (RMAN) to remove them. If the database is on raw disks, this statement does not delete the actual raw disk special files.
Views: 264 Saurabh Joshi
What is a PARTITION in Oracle? Why to use Partition And Types of Partitions
 
07:09
Hi guys in my today scenario I'm going to explain with you What is a PARTITION in Oracle? #WhatisPARTITION Why to use Partition And Types of Partitions Oracle database Unbeatable,Unbreakable Platform..
Views: 21747 Oracle World
Drop/Delete Oracle 12c database from sqlplus commandline
 
02:58
Simple demonstration to show how to Drop /Delete Oracle database from Sql*Plus Command line
Views: 1390 Oracle Testlab
PART 5 ADD PARTITION
 
02:35
alter table, data warehousing add partition, range partition
part 10 modify partition add list values
 
01:30
alter table modify partition,add list values, list partition, data warehousing
part 4 date range partition
 
02:33
date range paritition data warehousing range partition
PART 7 MERGE PARTITION
 
01:54
merge partition, alter table, data warehousing
part 15 move partition
 
01:58
move partition, alter table, data warehousing
2.ORACLE WORLD - Recovery of Drop Table with purge condition using Current SCN Number in Flashback
 
06:35
Hello friends in this video we learn about that how to recover a permanent dropped table using current SCN number in Oracle database using Flashback Technology ... By Lalit saini
Views: 2422 Oracle World
SQL tutorial 62: Indexes In Oracle Database By Manish Sharma RebellionRider
 
04:03
Watch and learn concepts of SQL Index In Oracle Database. In this tutorial you will learn about B-Tree Index and Function based Index. ------------------------------------------------------------------------ ►►►LINKS◄◄◄ Blog : Previous Tutorial ► ------------------------------------------------------------------------- ►►►Help Me In Getting A Job◄◄◄ ►Help Me In Getting A Good Job By Connecting With Me on My LinkedIn and Endorsing My Skills. All My Contact Info is Down Below. You Can Also Refer Me To Your Company Thanks ------------------------------------------------------------------------- Copy Cloud referral link || Use this link to join copy cloud and get 20GB of free storage https://copy.com?r=kb4rc1 -------------------------------------------------------------------------- ►Make sure you SUBSCRIBE and be the 1st one to see my videos! -------------------------------------------------------------------------- Amazon Wishlist: http://bit.ly/wishlist-amazon ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ►►►Find me on Social Media◄◄◄ Follow What I am up to as it happens on https://twitter.com/rebellionrider https://www.facebook.com/imthebhardwaj http://instagram.com/rebellionrider https://plus.google.com/+Rebellionrider http://in.linkedin.com/in/mannbhardwaj/ http://rebellionrider.tumblr.com/ http://www.pinterest.com/rebellionrider/ You can also Email me at for E-mail address please check About section Please please LIKE and SHARE my videos it makes me happy. Thanks for liking, commenting, sharing and watching more of our videos This is Manish from RebellionRider.com ♥ I LOVE ALL MY VIEWERS AND SUBSCRIBERS
Views: 39456 Manish Sharma
part 1 table space
 
04:53
table space, data warehousing, partition,segment,extent,data block
Views: 2112 Dr. Girija Narasimhan
part 19 compare truncate,drop,coalsec
 
02:35
compare truncate, drop, drop list values, coalesc partition, data warehousing alter table
Delete, Drop, and Truncate Statements in Hive
 
06:41
Delete, Drop, and Truncate Statements in Hive Delete Statement: Delete statement is used to delete certain rows from a table based on a condition specified using the WHERE clause. The syntax is in below as highlighted. DELETE FROM tablename [WHERE expression]; Note: DELETE statement is available from hive 0.14.0 version and above Drop Statement: The drop table statement is used to drop the table altogether. The syntax is highlighted here: DROP TABLE IF EXISTS TABLENAME; Let’s quickly see how the managed table and external table differs when dropping the table. We have already discussed this in the “Two different types of hive tables” video. Take a look at it if you haven’t. For the managed hive tables, the drop table statement removes the metadata information as well as the data. The data will be actually moved to .Trash/Current directory. metadata will be permanently deleted. However for external tables, only the metadata information is permanently deleted and the actual data remains intact in the hdfs directories. So in the case of external table, if the table was deleted accidentally, then the table can be re-created by using the same schema and specifying the same location for the hdfs data directory. If deleting the external table was the intention, then after deleting the table using the drop statement, you may also delete the underlying hdfs data directory by issuing the hdfs dfs -rm command. Truncate Statement: Truncate table statement is used to remove only the data from the table. The table structure with the schema remains intact. Truncate removes all the rows from a table or partition. The syntax is highlighted below. TRUNCATE table syntax TRUNCATE TABLE TABLENAME;
Views: 1117 BigDataElearning
How to recover dropped table using flashback
 
06:13
In this video i'm going to show you how to recovery dropped table using flashback step by step. #recover #dropped #table #flashback
Views: 3485 OCP Technology
part 9 - list partition
 
02:21
list partition, data warehousing, alter table
ORACLE Analytic Functions for Data Warehousing 2/ Arabic
 
12:32
ORACLE Analytic Functions for Data Warehousing 2/ Arabic FIRST_VALUE last_VALUE row_number() --FIRST_VALUE and LAST_VALUE Analytic Functions select EMPLOYEE_ID, FIRST_NAME, HIRE_DATE from employees order by hire_date; select EMPLOYEE_ID, FIRST_NAME, HIRE_DATE , min(HIRE_DATE) over ( ) first_HIRE_DATE from employees select EMPLOYEE_ID, FIRST_NAME, HIRE_DATE , FIRST_VALUE(HIRE_DATE) over ( ) first_HIRE_DATE from employees order by hire_date; select EMPLOYEE_ID, FIRST_NAME, HIRE_DATE , max(HIRE_DATE ) over ( ) last_HIRE_DATE from employees select EMPLOYEE_ID, FIRST_NAME, HIRE_DATE , last_VALUE(HIRE_DATE ) over ( ) last_HIRE_DATE from employees order by HIRE_DATE drop table student_exam_result; CREATE TABLE student_exam_result (student_id number, exame_name varchar2(100), exame_try number, exame_results number ); insert into student_exam_result values(1,'calcluas',1,50); insert into student_exam_result values(1,'calcluas',2,66); insert into student_exam_result values(1,'calcluas',3,20); insert into student_exam_result values(2,'calcluas',1,66); insert into student_exam_result values(2,'calcluas',2,null); insert into student_exam_result values(2,'calcluas',3,7); insert into student_exam_result values(3,'calcluas',1,50); insert into student_exam_result values(3,'calcluas',2,98); insert into student_exam_result values(3,'calcluas',3,null); select * from student_exam_result select student_id, exame_name,exame_try,exame_results, last_value(exame_results) IGNORE NULLS over (PARTITION BY student_id, exame_name ) last_grade from student_exam_result order by student_id, exame_name, exame_try select student_id, exame_name,exame_try,exame_results, last_value(exame_results) IGNORE NULLS over (PARTITION BY student_id, exame_name ) last_grade, max(exame_results) over (PARTITION BY student_id, exame_name ) max_grade, avg(exame_results) over (PARTITION BY student_id, exame_name ) avg_grade from student_exam_result order by student_id, exame_name, exame_try ------------------------ select employee_id,first_name ,row_number() over(order by employee_id ) from employees select employee_id,first_name ,rownum from employees select employee_id,first_name ,department_id, row_number() over(partition by department_id order by employee_id ) from employees
Views: 556 khaled alkhudari
How to Recover MySQL, MSSql and Oracle Databases ⚕️👨‍💻🖥️
 
12:39
👍 Watch how to recover MySQL, MSSql and Oracle databases. How to backup such databases, which software to use for this purpose, and how to restore the databases from such backups. Hetman Partition Recovery - https://hetmanrecovery.com/hard_drive_recovery/software.htm. Content: Creating a backup copy and restoring MySQL databases with MySQL Workbench; Restoring a database manually; Creating a backup copy and restoring MySQL databases with mysqldump; Recovering damaged MySQL database tables with the help of myisamchk; Recovering a Microsoft SQL Server database; How to create a copy of SQL Server database for further restore, import or transfer; Creating a backup file manually; Creating a backup copy of Oracle Database Express Edition; Recovering tables with Hetman Partition Recovery; That is all for now. Hit the Like button and subscribe to our channel. Leave comments to ask questions. Thank you for watching. Good luck. Playlist: Recovering Data Deleted From The Hard Disk of a Windows Computer or Laptop - https://www.youtube.com/playlist?list=PLWfvrWYvsWiJz-xwWNm8AnZSzoAzDq-Zp. Other videos: #DataBaseRecovery, #MySqlRecovery, #MSSqlRecovery, #OracleRecovery, #DataBaseBackup.
Views: 916 Hetman Recovery
TALLERES ORACLE :  FLASHBACK ORACLE
 
01:43:59
Fecha : 09/01/2018 Se desarrollaron ejemplos de uso de Flashback Drop table, Version Query, Flashback Table y otros. Una forma rápida de consultar el histórico de modificaciones a una tabla o la restauración de una tabla dropeada. Instructor : ALAIN MEJIA AVALOS
How to drop tablespace in Oracle 10g or 11g
 
01:34
This is how to drop tablespace in oracle 10g or oracle 11g, you can delete tablespace in oracle if you want. Delete or drop tablesapce in oracle cascade
Views: 221 Tanya Kenapa?
Introduction - Partition in SQL Server - Part 1 Tamil
 
04:05
Click here to Subscribe to IT PORT Channel : https://www.youtube.com/channel/UCMjmoppveJ3mwspLKXYbVlg Partitioning is the process of dividing a single large table/index into multiple logical chunks/partitions in such way that each partition can be managed separately without having much overall impact on the availability of the table/index. Partitioning improves the manageability and availability of table/index as well as the performance of the queries running against this partitioned table/index SQL Server supports table and index partitioning. The data of partitioned tables and indexes is divided into units that can be spread across more than one filegroup in a database. The data is partitioned horizontally, so that groups of rows are mapped into individual partitions. All partitions of a single index or table must reside in the same database. The table or index is treated as a single logical entity when queries or updates are performed on the data. Explained in Tamil
Views: 412 IT Port
ORACLE SQL AND PL/SQL INTERVIEW QUESTION : DELETE DUPLICATE RECORDS FROM  A TABLE(3 ways)
 
13:15
This video tutorial demonstrates about how we can delete duplicate records from a table, the video shows 3 different ways to delete duplicate record from a table, one using Group by, second one by using correlated joins and third on by using rownum analytical function You can get the code from our website http://oracleplsqlblog.com/FullBlog/FullBlog/21
Views: 3572 Kishan Mashru
PART 6 RANAME PARTITION
 
01:15
rename partition, data warehousing, alter table
Global Index rebuild scenario in Oracle Database 11g
 
08:41
Why and How we need to rebuild global Index in Oracle 11g
Views: 2818 Athar Fahad
part 11  modify parition drop values
 
02:15
alter table modify partition, drop values,
part 16 default value add list partition
 
03:21
default value using list partition, alter table, data warehousing
part 13 hash partition
 
02:15
HASH ALGORITHM, hash partition, data warehousing create table
Views: 5125 Dr. Girija Narasimhan
part 3 range alphabet
 
05:25
data warehousing, range partition, table space, create table
How to recover truncated table without backup in oracle
 
12:22
TRY PRM For Oracle Database , FULL GUI supported, easy to use, written in Java cross platform . PRM can help user recover data from truncated table or corrupted database!
Oracle Part 4 Relationships and Tables
 
23:44
Uniqueness, Relationships, Create Table, Drop Table
Views: 2324 Free OpenMentor
Indexes in Oracle :Index Scan Methods :Part 2
 
30:18
The Video Explains when should you create indexes. The difference between Simple and composite Index, Relevance of order in composite indexes and Index Scan Methods in detail. 1.Index Unique scan 2.Index Range Scan 3. Index Skip Scan 4. Fast full Index Scan 5. Full Index Scan If you have any questions just drop in a comment
Views: 5220 Tech Coach
Difference Between Delete and Truncate
 
03:41
Below is link for Useful Pl/SQL Books http://goo.gl/XMy0tt ---------------------------------------------------------- Difference Between Delete and Truncate in Detail On bigger picture they serve the same purpose but there are many Differences listed with examples Point Delete Truncate 1. Data Recovery Delete: Come under the DML Category, we need to commit or Rollback explicitly to make the changes permanent, so we can recover the data by Rollback command fully with in a session or up to a point if Save Points are used Fall In DDL Category (DDL Command issue the Auto commit implicitly) so no chances of Recovery even not using the Flashback table method. But Truncate operations are also logged , they didn’t generate redo SQL but they are logged , view for truncated data info V$LOGMNR_CONTENTS 2. Data Removal Delete Can remove all or selected data using the Where Clause predicates. Or we can say delete any subset of rows We can Truncate complete table or a partition or sub partition of a table. 3. Speed Delete is Slower because oracle maintain the redo logs for Read Consistency (so that every session connected can see a consistent data at a given point of time ) Delete is very time consuming activity especially when table have numerous indexes and Triggers associated with table Faster as no data logs are maintained no associated trigger firing. 4. DML Triggers Firing DML (Delete) triggers associated with table will fire. DML Trigger will not fire in case of truncate method. 5. Flashback Technology Data can be recovered even after commit operation using Flashback Table options Flashback_transaction_query table will give what to recover and up to which point. Data cannot be recovered in truncate method by Flashback table option. 6. Referential Integrity Constraint Behavior if we don’t have related data in child table then we can delete the data from the parent table or we have variants like On Delete Cascade & on Delete set Null. We can’t truncate a table with enable Referential Integrity Constraint, even there is no data in the child table, we have to disable or drop the constraint if we want to truncate the table. Exception: Truncate is possible if the FK is self-referential means primary key and foreign key are on the same table. 7. Space De allocation or Space Utilization No extent reset with delete when deleting rows from a table, extents are not de allocated, So if there were 50 extents in the table before the deletion, there will still be 50 after the deletion. Truncate: When a table is truncated it will free the space allocated except in case of reuse storage clause. This space can subsequently be used only by new data in the table or cluster resulting from insert or update operations .All extents are de allocated leaving only the extents specified when the table was originally created .Example So if the table was originally created with min extents 3, there will be 3 extents remaining when the tables is truncated. When you truncate a table, NEXT is automatically reset to the last extent deleted. 8. High Water Mark Delete will not reset the high water mark Truncate will reset the High Water mark which is very important for performance point of view as in case of full table scan and full index scan oracle will read all the block under high water mark this makes a lot of difference in terms of performance. 9. Cluster No as such restriction with delete. You cannot individually truncate a table that is part of a cluster. You must truncate the cluster, Delete all rows from the table, or drop and re-create the table. 10. Information Capturing Delete : we can capture the row information what we have deleted using Delete Method, f you are deleting multiple records then use composite data types (collections & records) Truncate Don’t have this feature of capturing the deleted records. 11. Function Based Index Impact DELETE You cannot delete rows from a table if a function-based index on the table has become invalid. You must first validate the function-based index. Truncate: No as such restriction 12. UNUSABLE Indexes Delete no as such feature. Truncate if table is not empty then truncate make all unusable indexes to useable. 13. Complex views You cannot delete data from a Complex view except through INSTEAD OF triggers. But we can delete data from simple Views and MV. We cannot truncate a view simple or complex but you can truncate MV with special Features like Preserve MV Logs and Purge MV Logs. 14. Privileges Delete You need to provide delete table privilege on object. Truncate you must have drop table privilege there is no truncate table privilege exists. 15. Domain Index No as such restriction You cannot truncate the object having domain index in invalid or In progress state
Views: 12683 Ram Gupta

Country club cover letters
The best writing service review
Advanced energy materials cover letter
Job cover letter opening greeting
Cal state fresno admissions essay