INTERVIEW QUESTIONS DATA WAREHOUSING ABINITIO DETAILS

Question: Describe the process steps you would perform when defragmenting a data table. This table contains mission critical data.

Answer: There are several ways to do this:

1) We can move the table in the same or other tablespace and rebuild all the indexes on the table.

alter table <table_name> move <tablespace_name> this activity reclaims the defragmented space in the table

analyze table table_name compute statistics to capture the updated statistics.

2)Reorg could be done by taking a dump of the table, truncate the table and import the dump back into the table.

There are several ways to do this:

1) We can move the table in the same or other tablespace and rebuild all the indexes on the table.

alter table <table_name> move <tablespace_name> this activity reclaims the defragmented space in the table

analyze table table_name compute statistics to capture the updated statistics.

2)Reorg could be done by taking a dump of the table, truncate the table and import the dump back into the table.


Source: CoolInterview.com

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