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What are Clusters ?

Clusters are groups of one or more tables physically stores together to share common columns and are often used together.




  
Total Answers and Comments: 1 Last Update: October 01, 2006   
  
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October 01, 2006 12:32:47   #1  
partho sarathi konar        

RE: What are Clusters ?

Clusters are groups of one or more tables physically stored together because they share common columns and are often used together. This improves disk access time.

The related columns of the tables in a cluster are called the cluster key. The cluster key is indexed so that rows of the cluster can be retrieved with a minimum amount of I/O.

No matter how many tables within the cluster contain the cluster key value it is stored only once each in the cluster and the cluster index. Therefore less storage is required.

Whether or not a table is part of a cluster is transparent to users and to applications. Data stored in a clustered table is accessed by SQL in the same way as data stored in a nonclustered table.


 
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 Related Questions

Schema objects are the logical structures that directly refer to the database's data. Schema objects include tables, views, sequences, synonyms, indexes, clusters, database triggers, procedures, functions 

Clusters are groups of one or more tables physically stores together to share common columns and are often used together. 
Latest Answer : Clusters are groups of one or more tables physically stored together because they share common columns and are often used together. This improves disk access time.The related columns of the tables in a cluster are called the cluster key. The cluster key ...

Hash clusters are better choice when a table is often queried with equality queries. For such queries the specified cluster key value is hashed. The resulting hash key value points directly to the area 


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