Starting with version 6.5, 4D allows you to now choose between two index modes: the "traditional" mode, which is the mode used in previous versions of 4D, and the new "fast" mode, which in most cases allows for a significant increase in speed.

If you choose the fast mode, you will be allowed to indicate the usage type for which you want the index to be most efficient: When adding or inserting records or when performing queries.

Mode	Advantages	Disadvantages
Fast	- Speed of construction - Possible parameter setting - according to the use	- Consumption of more - significant memory< - Access to tables is blocked - when using this index
Traditional	- Consume less memory - The modification of the table is - possible when using this index	- Slower construction - No optimization