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Question 96 :

What is user Account in Oracle database?

Answer :

An user account is not a physical structure in Database but it is having important relationship to the objects in the database and will be having certain privileges.

Question 97 :

When will the data in the snapshot log be used?

Answer :

We must be able to create a after row trigger on table (i.e., it should be not be already available) After giving table privileges. We cannot specify snapshot log name because oracle uses the name of the master table in the name of the database objects that support its snapshot log. The master table name should be less than or equal to 23 characters. (The table name created will be MLOGS_tablename, and trigger name will be TLOGS name).

Question 98 :

What dynamic data replication?

Answer :

Updating or Inserting records in remote database through database triggers. It may fail if remote database is having any problem.

Question 99 :

What is Two-Phase Commit ?

Answer :

Two-phase commit is mechanism that guarantees a distributed transaction either commits on all involved nodes or rolls back on all involved nodes to maintain data consistency across the global distributed database. It has two phase, a Prepare Phase and a Commit Phase.

Question 100 :

How can you Enforce Referential Integrity in snapshots ?

Answer :

Time the references to occur when master tables are not in use. Peform the reference the manually immdiately locking the master tables. We can join tables in snopshots by creating a complex snapshots that will based on the master tables.