Question
What is the difference between truncate and delete? why is one faster? can we rollback both? how would a full table scan behave after?
Answers
Truncate is nearly instantaenous, cannot be rolled back, and is fast because Oracle simply resets the HWM. When a full table scan is performed on a table, such as for a sort operation, Oracle reads to the HWM. So if you delete every single solitary row in 10 million row table so it is now empty, sorting on that table of 0 rows would still be extremely slow.   Your Comment




  • Contributors: *,
More Software Questions..
What is the inputsplit in map reduce software?
What is software configuration management?
What Is Java Api For Xml-based Rpc (jax-rpc)?
How can you implement fine-grained auditing?
What is IBM’s simple explanation for Big Data’s four critical features?
What is static synchronized method in JDBC API? Give an example?
What does the NULLIF function do?
What happens if a start method is not invoked and the run method is directly invoked?
Should we override finalize method
what is the difference between mysql_fetch_array and mysql_fetch_object?
How will XML affect my document links?
Why to use Style Sheets?
What are Filters in MVC?
Can you explain Application layer in OSI model?
How to define new testplan attributes?
What are the minimum system requirements to run Photoshop? Is it possible to run Photoshop over linux?
Which oracle package is used to manage the oracle lock management services?
What is Latch Up? Explain Latch Up with cross section of a CMOS Inverter. How do you avoid Latch Up?
What is marker interface?
What types of partitioning are there for BW?


Search
Can you Answer!!
  • Q What is Dynamic Binding
  • Q What is zigbee?
  • Q Can i put google maps on my site without using the google maps apis?
  • Q ‘Impudent’ means:
  • Q What is a negatively charged electrode called?
  • Q How to invoke a Servlet?
  • Q Iscsi port binding considerations
  • Q From which the cathode ray particles originate in a discharge tube?
  • Q Can we implement all the concepts of OOPS using the keyword struct
  • Q Who accompanied Che Guera in his Motor Cycle Adventure trips?
  • Q What events are fired when a page loads ?