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What is Autonomous transaction in Oracle
 
05:05
What is Autonomous transaction in Oracle. This is very frequently asking question in Interview. Hello Friend, in this Video You can learn how we can give the answer of Autonomous Transactions. An autonomous transaction is available from Oracle 8i. It is a very cool, useful, unique and powerful feature in oracle. An autonomous transaction is an independent transaction that is initiated by another transaction. It must contain at least one Structured Query Language (SQL) statement. When an autonomous transaction is called, the original transaction (calling transaction) is temporarily suspended. The autonomous transaction must commit or roll back before it returns control to the calling transaction. Once changes have been made by an autonomous transaction, those changes are visible to other transactions in the database. Autonomous transactions can be nested. For use Autonomous Transactions feature in program we have to use PRAGMA AUTONOMOUS_TRANSACTION Key word in Program When to use Autonomous Transactions? • Logging mechanism you need to log an error to your database log table. On the other hand, you need to roll back your core transaction because of the error. And you don't want to roll back over other log entries. • Commits and rollbacks in your database triggers If you define a trigger as an autonomous transaction, then you can commit and/or roll back in that code. • Software usage meter You want to keep track of how often a program is called during an application session. This information is not dependent on, and cannot affect, the transaction being processed in the application. Mutation Error Using autonomous transaction we can avoid mutation error. IF you want to share with your friend this video you can copy below block of text with link and past your friend group. ----------------------------------------------------------------------------- What is autonomous transaction in Oracle This is a very frequently ask Question in Interview Please Share this video with your friends and Oracle groups and communities. https://www.youtube.com/watch?v=gyvFajpfoWE ----------------------------------------------------------------------------- For More video's you can use blow link. https://www.youtube.com/user/rameshwargupta1/videos Join With us our Facebook Group for PLSQL Interview Q/A https://www.facebook.com/groups/146487615764170/ Join our Blogs http://oracletemple.blogspot.in/ Watch More... What is Parameterized Cursor in Oracle https://www.youtube.com/watch?v=JMKwHlVi6-A What is autonomous transaction in Oracle. https://www.youtube.com/watch?v=gyvFajpfoWE What are Constraints available in Oracle. https://www.youtube.com/watch?v=WivhdLXQklQ What is Mutation Error and How to avoid mutation. https://www.youtube.com/watch?v=CbWNCyW18Bs 5 Effective way to delete Duplicate rows https://www.youtube.com/watch?v=1wtTtnc87Oc What is Difference between Delete and Truncate https://www.youtube.com/watch?v=7b6wQ3Qumgg
Views: 13877 Ram Gupta
What is View in PL SQL
 
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What is a View What are the Advantages of Views. For More detail you can visit our facebook Page , Facebook Group our blog Facebook Page https://www.facebook.com/SQL-PLSQL-Developer-Interview-QA-249157952111412/?ref=page_internal ------------------------------------------------- Join our group on Facebook https://www.facebook.com/groups/14648... -------------------------------------------------------------------------------- Visit our blog http://oracletemple.blogspot.in/ -------------------------------------------------------------------------------- Useful plsql books link. http://goo.gl/XMy0tt ------------------------------------------------- Watch More... What is Parameterized Cursor in Oracle https://www.youtube.com/watch?v=JMKwH... What is autonomous transaction in Oracle. https://www.youtube.com/watch?v=gyvFa... What are Constraints available in Oracle. https://www.youtube.com/watch?v=Wivhd... What is Mutation Error and How to avoid mutation. https://www.youtube.com/watch?v=CbWNC... 5 Effective way to delete Duplicate rows https://www.youtube.com/watch?v=1wtTt... What is Difference between Delete and Truncate https://www.youtube.com/watch?v=7b6wQ...
Views: 16093 Ram Gupta
How to Delete the Duplicate Records in oracle
 
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http://oracletemple.blogspot.in/ How to Delete the duplicate records How delete the duplicate rows ? Tips: - Always take extra caution while deleting records. 1. First identify the duplicates using select. 2. Double verify those are actual ‘duplicates’ or not 3. Take backup if necessary 4. Apply commit only if you are sure. -~-~~-~~~-~~-~- Please watch: "difference between delete and truncate" https://www.youtube.com/watch?v=7b6wQ3Qumgg -~-~~-~~~-~~-~- ------------------------------------------------------------------ Below is link for Useful Pl/SQL Books http://goo.gl/XMy0tt ---------------------------------------------------------- Watch More... What is Parameterized Cursor in Oracle https://www.youtube.com/watch?v=JMKwHlVi6-A What is autonomous transaction in Oracle. https://www.youtube.com/watch?v=gyvFajpfoWE What are Constraints available in Oracle. https://www.youtube.com/watch?v=WivhdLXQklQ What is Mutation Error and How to avoid mutation. https://www.youtube.com/watch?v=CbWNCyW18Bs 5 Effective way to delete Duplicate rows https://www.youtube.com/watch?v=1wtTtnc87Oc What is Difference between Delete and Truncate https://www.youtube.com/watch?v=7b6wQ3Qumgg
Views: 21862 Ram Gupta
Difference Between Delete and Truncate
 
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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: 12824 Ram Gupta
What are types of View available in Oracle
 
05:10
What are the types of View available in Oracle? Watch More... What is Parameterized Cursor in Oracle https://www.youtube.com/watch?v=JMKwHlVi6-A What is autonomous transaction in Oracle. https://www.youtube.com/watch?v=gyvFajpfoWE What are Constraints available in Oracle. https://www.youtube.com/watch?v=WivhdLXQklQ What is Mutation Error and How to avoid mutation. https://www.youtube.com/watch?v=CbWNCyW18Bs 5 Effective way to delete Duplicate rows https://www.youtube.com/watch?v=1wtTtnc87Oc What is Difference between Delete and Truncate https://www.youtube.com/watch?v=7b6wQ3Qumgg
Views: 9592 Ram Gupta
Difference Between Case and Decode
 
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What is the difference between case and decode ? Important links for Oracle Developers For for SQL - PL/SQL Interview Questions Answers Facebook group https://www.facebook.com/groups/146487615764170/ Download Free PLSQL Interview Books , Documents Videos from here https://www.facebook.com/groups/146487615764170/files/ Free SQL / PLSQL Video on YouTube Channel SUBSCRIBE https://www.youtube.com/c/ramguptaoracle?sub_confirmation=1 Visit oracle forms / report / SQL PLSQL blog http://oracletemple.blogspot.in/ Oracle Community Google+ https://plus.google.com/u/0/collection/4mW-jB Join our facebook group https://www.facebook.com/groups/146487615764170/ Follow us on Twitter https://twitter.com/Rameshwar275 Simply Like and Share :) Oracle SQL PLSQL FaceBook group https://www.facebook.com/groups/146487615764170/ ORACLE SQL PLSQL VIDEO LINKS What is Parameterized Cursor in Oracle https://www.youtube.com/watch?v=JMKwHlVi6-A What is autonomous transaction in Oracle. https://www.youtube.com/watch?v=gyvFajpfoWE What are Constraints available in Oracle. https://www.youtube.com/watch?v=WivhdLXQklQ What is Mutation Error and How to avoid mutation. https://www.youtube.com/watch?v=CbWNCyW18Bs 5 Effective way to delete Duplicate rows https://www.youtube.com/watch?v=1wtTtnc87Oc What is Difference between Delete and Truncate https://www.youtube.com/watch?v=7b6wQ3Qumgg What are types of View available in Oracle https://www.youtube.com/edit?o=U&video_id=PN-NsSA2R-E
Views: 3657 Ram Gupta
What are Constraints in Oracle - [ SQL Interview Question ]
 
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This is very frequently asking question in SQL - PLSQL interview. For more details about SQL and PLSQL Interview Questions answers visit my blog http://oracletemple.blogspot.in/ Please Leave your comments about this video. Useful plsql books link. http://goo.gl/XMy0tt Watch More... What is Parameterized Cursor in Oracle https://www.youtube.com/watch?v=JMKwHlVi6-A What is autonomous transaction in Oracle. https://www.youtube.com/watch?v=gyvFajpfoWE What are Constraints available in Oracle. https://www.youtube.com/watch?v=WivhdLXQklQ What is Mutation Error and How to avoid mutation. https://www.youtube.com/watch?v=CbWNCyW18Bs 5 Effective way to delete Duplicate rows https://www.youtube.com/watch?v=1wtTtnc87Oc What is Difference between Delete and Truncate https://www.youtube.com/watch?v=7b6wQ3Qumgg
Views: 6260 Ram Gupta
What is Parameterized Cursor in Oracle
 
03:39
What is Parameterized Cursor in Oracle. In simple words a cursor with parameter is called parameterized cursor. PL/SQL allows developer to pass parameters into cursors. Same as like we can pass parameter into function and procedure. PL/SQL Parameterized cursor pass the parameters into a cursor and use them in to query. Cursor becomes more reusable using Cursor parameters. PL/SQL Parameterized cursor define only data type of parameter and not need to define it's length. In Parameterized cursor scope of the parameters are local within program only. Optionally, we can also give a default value for the parameter, which will take effect if no value is passed to the cursor. Key point 1. Scope of the parameters are locally 2. You can assign default value to a cursor parameter. 3. Cursor becomes more reusable with Cursor parameters. 4.PL/SQL Parameterized cursor define only data type of parameter and not need to define it's length. Please Leave your comments about this video and you can leave your question also for new videos. -------------------------------------------------------------------------------- Join our group on Facebook https://www.facebook.com/groups/146487615764170/ -------------------------------------------------------------------------------- Visit our blog http://oracletemple.blogspot.in/ -------------------------------------------------------------------------------- Useful plsql books link. http://goo.gl/XMy0tt ------------------------------------------------- Watch More... What is Parameterized Cursor in Oracle https://www.youtube.com/watch?v=JMKwHlVi6-A What is autonomous transaction in Oracle. https://www.youtube.com/watch?v=gyvFajpfoWE What are Constraints available in Oracle. https://www.youtube.com/watch?v=WivhdLXQklQ What is Mutation Error and How to avoid mutation. https://www.youtube.com/watch?v=CbWNCyW18Bs 5 Effective way to delete Duplicate rows https://www.youtube.com/watch?v=1wtTtnc87Oc What is Difference between Delete and Truncate https://www.youtube.com/watch?v=7b6wQ3Qumgg
Views: 6611 Ram Gupta
What is Mutation in oracle
 
09:22
After watching this video you can get clear understanding about Mutation error and how we can avoid mutation in program. Below is link for Useful Pl/SQL Books http://goo.gl/XMy0tt Watch More... What is Parameterized Cursor in Oracle https://www.youtube.com/watch?v=JMKwHlVi6-A What is autonomous transaction in Oracle. https://www.youtube.com/watch?v=gyvFajpfoWE What are Constraints available in Oracle. https://www.youtube.com/watch?v=WivhdLXQklQ What is Mutation Error and How to avoid mutation. https://www.youtube.com/watch?v=CbWNCyW18Bs 5 Effective way to delete Duplicate rows https://www.youtube.com/watch?v=1wtTtnc87Oc What is Difference between Delete and Truncate https://www.youtube.com/watch?v=7b6wQ3Qumgg
Views: 15580 Ram Gupta
What is Implicit and Explicit cursors
 
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What are Implicit and Explicit cursors http://oracletemple.blogspot.in -~-~~-~~~-~~-~- Please watch: "difference between delete and truncate" https://www.youtube.com/watch?v=7b6wQ3Qumgg -~-~~-~~~-~~-~- ------------------------------------------------------------------ Below is link for Useful Pl/SQL Books http://goo.gl/XMy0tt ----------------------------------------------------------
Views: 6447 Ram Gupta
Difference between Rowid and Rownum
 
02:07
Difference between Rowid and Rownum If you like this video please share and subscribe channel on youtube for more videos Useful Pl/sql Books http://goo.gl/XMy0tt Watch More... What is Parameterized Cursor in Oracle https://www.youtube.com/watch?v=JMKwHlVi6-A What is autonomous transaction in Oracle. https://www.youtube.com/watch?v=gyvFajpfoWE What are Constraints available in Oracle. https://www.youtube.com/watch?v=WivhdLXQklQ What is Mutation Error and How to avoid mutation. https://www.youtube.com/watch?v=CbWNCyW18Bs 5 Effective way to delete Duplicate rows https://www.youtube.com/watch?v=1wtTtnc87Oc What is Difference between Delete and Truncate https://www.youtube.com/watch?v=7b6wQ3Qumgg
Views: 10617 Ram Gupta
PL / SQL Interview Questions Answers
 
01:02
Hi, Friends Welcome to PL/SQL Interview Questions Answers Videos Series. https://youtu.be/Ot4UvVgVoNw Useful Pl/sql Books http://goo.gl/XMy0tt
Views: 6214 Ram Gupta

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