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SQL Anywhere 11.0.0 » UltraLite - Database Management and Reference » Using UltraLite Databases » Working with UltraLite databases » Working with UltraLite indexes

 

Adding UltraLite indexes

You can use either Sybase Central or Interactive SQL to perform this task.

Note

UltraLite does not detect duplicate or redundant indexes. As indexes must be maintained with the data in your database, add your indexes carefully.

Sybase Central

In Sybase Central, you can perform this task while working with a selected database.

To create a new index for a given UltraLite table (Sybase Central)

  1. Connect to the UltraLite database.

  2. Right-click Indexes, and choose New » Index.

  3. Follow the instructions in the wizard.

Interactive SQL

In Interactive SQL, you can perform this task with the CREATE INDEX statement.

To create a new index for a given UltraLite table (Interactive SQL)

  1. Connect to an UltraLite database.

  2. Execute a CREATE INDEX statement.

    This statement creates an index with the default maximum hash size you have configured. To create an index that overrides the default, ensure you use the WITH MAX HASH SIZE value clause to set a new value for this index instance. See UltraLite CREATE INDEX statement.

    For example, to speed up a search on employee surnames in a database that tracks employee information, and tune the performance of queries against this index, you could create an index called EmployeeNames and increase the hash size to 20 bytes with the following statement:

    CREATE INDEX EmployeeNames
    ON Employees (Surname, GivenName)
    WITH MAX HASH SIZE 20;
See also