W1:A1 W2:A2 ..... WN:AN

  2 : 3                   4 : 5                    5 : 7 

W1W1+A1 = 25 W2W2+A2=49 WNWN+AN = 512

= 72/180

= 80/180

= 75/180  

 =>     5   :   3

Therefore, the ratio is  5: 3

Total quantity of mixture = 75 litre

Milk  :  Water  =  4  :  1   

                   3       :       1

1:m

The correction of errors is more difficult than the detection. In error detection, checks only any error has occurred. In error correction, the exact number of bits that are corrupted and location in the message are known. The number of the errors and the size of the message are important factors.

Answer : (5)

The first four pairs indicate opposite of one another, whereas (5) is a pair of words having the same meaning.

Movement of letters  is +1, +2, +3, +4, +5

Therefore, SMILE => TOLPJ

Basic Replication : Basic replication is implemented using standard CREATE SNAPSHOT or CREATE MATERIALIZED VIEW statements. It can only replicate data and not procedures, indexes replication is always one-way, and snapshot copies are read only.

Advanced Replication : Advanced replication supports various configurations of updatable snapshot, multi-master and update anywhere replication. It is more difficult to configure but allows data and other database objects like indexes and procedures to be replicated.

Differences between Basic and Advanced replications:

- With basic replication, data replicas provide read-only access to the table data whereas advanced replication features extend the capabilities of basic read-only replication by allowing applications to update table replicas throughout a replicated database system.

- With Basic Replication applications can query data from local data replicas. On the other hand with advanced replication, data replicas anywhere in the system can provide both read and update access to a table's data.

- %FOUND

 This is a Boolean variable which evaluates to TRUE if the last row is successfully fetched.

- %NOTFOUND

 This is a Boolean variable which evaluates to TRUE if the last row is not successfully fetched. This means there are no more rows to fetch.

- %ROWCOUNT

 Returns the number of rows fetched by the cursor.

- %ISOPEN

If the cursor is open, it evaluates to TRUE else FALSE.