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  Tutorial: Database Oracle Primary Keys and Unique Columns in Oracle and SQL-Server Tutorial

The SQL-92 standard requires that all values in a primary key be unique and that the column not allow null values. Both Oracle and Microsoft SQL Server enforce uniqueness by automatically creating unique indexes whenever a PRIMARY KEY or UNIQUE constraint

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Identify high-impact SQL

Oracle SQL tuning is a phenomenally complex subject. Entire books have been written about the nuances of Oracle SQL tuning; however, there are some general guidelines that every Oracle DBA follows in order to improve the performance of their systems.

Tuning Oracle SQL is like fishing. You must first fish in the Oracle library cache to extract SQL statements and rank the statements by their amount of activity.

Locate the most frequently used SQL

The SQL statements will be ranked according the number of executions and will be tuned in this order. The executions column of the V$SQLAREA view can be used to locate the most frequently used SQL. The following query can be used to locate such SQL statements.


 

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Database Oracle Primary Keys and Unique Columns in Oracle and SQL-Server Tutorial

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