db4o

ObjectField.Indexed Method 

turns indexing on or off.

void Indexed(
   bool flag
);

Parameters

flag
specify
true
or
false
to turn indexing on for this field

Remarks

turns indexing on or off.

Field indices dramatically improve query performance but they may considerably reduce storage and update performance.
The best benchmark whether or not an index on a field achieves the desired result is the completed application - with a data load that is typical for it's use.

This configuration setting is only checked when the com.db4o.ObjectContainer is opened. If the setting is set to

true
and an index does not exist, the index will be created. If the setting is set to
false
and an index does exist the index will be dropped.

See Also

ObjectField Interface | com.db4o.config Namespace