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About Indexes. Indexes are optional structures associated with tables and clusters that allow SQL statements to execute more quickly against a table. Just as the index in this manual helps you locate information faster than if there were no index, an Oracle Database index provides a faster access path to table data.
SQL Server databases have three types of files: 1  Primary data files. The primary data file is the starting point of the database and points to the other files in the database. 2  Secondary data files. Secondary data files make up all the data files, other than the primary data file. 3  Log files.