Need info abt gathering statistics

Hi,
We are using 8.0.6 database and have around 90GB data in our database. Since we are adding lot of data daily, I wanted to know, Do we need to gather/update statistics of all the tables in our database?
1) How gathering/updating statistics will help improve my database.
2) Do i need to have dba priviliges to gather these stats.
3) Do i need to update the stats daily.
4) Do i need to update stats for SYS? I heard it slows down the system.
5) What are the methods in 8.0.6 to gather statistics
Regards,
Ateeq

ateeqrahman wrote:
Hi,
We are using 8.0.6 database and have around 90GB data in our database. Since we are adding lot of data daily, I wanted to know, Do we need to gather/update statistics of all the tables in our database?
1) How gathering/updating statistics will help improve my database.Yes ...
2) Do i need to have dba priviliges to gather these stats.Not Necessary. You should have analyze any table privilege or execute permission on DBMS_STATS.
3) Do i need to update the stats daily.Depends on change in data
4) Do i need to update stats for SYS? I heard it slows down the system.
5) What are the methods in 8.0.6 to gather statisticsPlease read
http://www.oracle-base.com/articles/8i/RefreshingStaleStatistics8i.php
http://www.oracle-base.com/articles/8i/CostBasedOptimizerAndDatabaseStatistics.php
Regards
Rajesh

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