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This free online PDF editor allows you to add and edit texts, images and shapes in your PDF file. Annotate PDF online for free. No registration or installation ... You can create a hash cluster and store tables in the cluster. Rows are retrieved according to the results of a hash function. To find any row value, all you need to do is find the hash value for a cluster s key value, which you can get by using the hash function. The hash values point to data blocks in the hash cluster, so a single I/O will get you the row data and lead to more efficient performance. When your application uses equality queries such as, say, a query that returns all rows for region 10, hash clusters are a better choice than using a normal table with indexes. The reason is that the database hashes the specified cluster key, and the hash key value directly points to the area on disk where the database has stored the rows. Here s a simple example of how you create a hash cluster: SQL> CREATE CLUSTER emp_dept(deptno NUMBER(3)) 2 TABLESPACE users 3* HASH IS deptno HASHKEYS 200; Cluster created. SQL> Once you create the hash cluster, you create the cluster tables just as you would in a regular cluster. The HASHKEYS value specifies the maximum number of unique hash values that can be generated by the hash function. mac pdf editor online: PDFzorro | edit pdf -files online pdf editing software online jsPDF - HTML5 PDF Generator | Parallax
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