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TIBCO® Patterns 6.1.2

# Additional Considerations Related to Character Maps

Here are a few additional considerations related to character maps:

| • | A custom character map must be created and assigned a name before it can be used. Custom character maps are stored in the Patterns server as named items analogous to in-memory tables. Once created, however, the custom character maps cannot be deleted or updated – they exist for the life of the TIBCO Patterns server process.

| • | Thesaurus tables also have character maps. If you do not specify a character map for a thesaurus table, the default character map is used.

| • | By default, all fields used within a simple or cognate query must have the same character map. It is possible to override this when using the "C" interface and create simple or cognate searches across fields with different character maps. However, this can lead to invalid results and should never be done without consulting your TIBCO representative.

| • | The character map for a thesaurus should be the same as the character map for the fields to which the thesaurus is applied. Thesaurus matching does not work properly if the thesaurus and field do not use the same character map.

| • | Although a character map cannot be deleted, the addition of a character map can be rolled back by aborting the transaction that added it.

| • | A character map that is added by an open transaction cannot be read or used by any transaction other than the transaction that added the character map. The only exception to this is the character map list operation, which shows the character map in the listing. This prevents a character map that could be rolled back from being assigned to a thesaurus or table that is created by another transaction.

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