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An indexed cluster is a table cluster that uses an index to locate data. The clusterindex is a B-tree index on the cluster key. A cluster index must be created before anyrows can be inserted into clustered tables.Assume that you create the cluster employees_departments_cluster with the clusterkey department_id, as shown in Example 2–8. Because the HASHKEYS clause is notspecified, this cluster is an indexed cluster. Afterward, you create an index namedidx_emp_dept_cluster on this cluster key.
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