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Oracle Interview Questions And Answers
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It is a table that maintains a record of modifications to the master table in a snapshot. It is stored in the same database as master table and is only available for simple snapshots. It should be created before creating snapshots. 70. When will the data in the snapshot log be used ? 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). 72. What are the benefits of distributed options in databases ? Database on other servers can be updated and those transactions can be grouped together with others in a logical unit. Database uses a two phase commit. MANAGING BACKUP & RECOVERY 73. What are the different methods of backing up oracle database ? - Logical Backups - Cold Backups - Hot Backups (Archive log) 74. What is a logical backup ? Logical backup involves reading a set of databse records and writing them into a file. Export utility is used for taking backup and Import utility is used to recover from backup. 75. What is cold backup ? What are the elements of it ? Cold backup is taking backup of all physical files after normal shutdown of database. We need to take. - All Data files. - All Control files. - All on-line redo log files. - The init.ora file (Optional) 76. What are the different kind of export backups ? Full back - Complete database Incremental - Only affected tables from last incremental date/full backup date. Cumulative backup - Only affected table from the last cumulative date/full backup date. |