Interested to Buy Any Domain ? << Click Here >> for more details...
1)what is the difference between view and materilized view?
2)what is the difference between delete and truncate?
3)what is the difference between migration and upgration?
4)what is the difference between RMAN HOT BACKUP and normal
hot backup?
- 2 Answers
- 5935 Views
- 3i Infotech, I also Faced
- E-Mail Answers
Answers were Sorted based on User's Feedback
2)Truncate is a DDL command, which has autocommit hence
cant be rolled back where as delete is DML with user commit
& roll back option. Truncate is faster then delete since it
wont store any data to backup tablespace. before delting.
| Is This Answer Correct ? | 8 Yes | 0 No |
1)views , Materialized view or summary tables are subset of
a table filtering out uninteresting rows and columns.The
difference is that views are logical where as MV's are
actual tables.Views pulls real time data when ever queried
but data in MV is rfereshed based on users need.also when
you query a materialized view, you are querying a table,
which may also be indexed. In addition, because all the
joins have been resolved at materialized view refresh time,
you pay the price of the join once (or as often as you
refresh your materialized view), rather than each time you
select from the materialized view .Materialized views are
most often used in data warehousing / business intelligence
applications where querying large fact tables with
thousands of millions of rows would result in query
response times that resulted in an unusable.
2)
| Is This Answer Correct ? | 5 Yes | 0 No |
What is TERM ?
Mention the different languages present in dbms
What do you mean by entity type extension?
Excellent job opening with one of our client in Hyderabad About Client : It is an American e-commerce company based in Seattle, Washington, a leading online retailer of products that inform, educate, entertain and inspire.
IF Statements BLOCK 1 . IF a >= b THEN do_this …..; ELSE do_that….; END IF BLOCK 2 . IF a < b THEN do_that …..; ELSE do_this….; END IF; • Given any pair of non-NULL values for “a” and”b”, will Block 1 and Block 2 do the same thing? • What if either “a” or”b” (or both) is NULL?
What are the ACID Properties in a Database and Why are They Important?
What are the advantages and disadvantages of views in the database?
What are the the different Data Manipulation Language statements are?
What is the use of GRANT option in EXP command ?
Why do we need database normalization?
Which database server is best?
Can you explain insert, update and delete query?
-
Oracle (3259) - SQL Server (4518)
- MS Access (429)
- MySQL (1402)
- Postgre (483)
- Sybase (267)
- DB Architecture (141)
- DB Administration (291)
- DB Development (113)
- SQL PLSQL (3330)
- MongoDB (502)
- IBM Informix (50)
- Neo4j (82)
- InfluxDB (0)
- Apache CouchDB (44)
- Firebird (5)
- Database Management (1411)
- Databases AllOther (288)
