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Tuning individual Oracle SQL statements

The acronym SQL stands for Structured Query Language. SQL is an industry standard database query language that was adopted in the mid-1980s. It should not be confused with commercial products such as Microsoft SQL Server or open source products such as MySQL, both of which use the acronym as part [...]

Why and when should one tune?

One of the biggest responsibilities of a DBA is to ensure that the Oracle database is tuned properly. The Oracle RDBMS is highly tunable and allows the database to be monitored and adjusted to increase its performance.

One should do performance tuning for the following reasons:

The speed of computing [...]

Do not index every column in the table – have only those indexes, which are required.
Distribute your data to parrallelise the IO operations among multiple disks especially for those tables which have lots of IO’s.
Try to avoid large data retrievals, since if the data being retrieved from a table is more than 10%-20% of the [...]