The isolation level of SQL toolkit is set to REPEATABLE_READ by default.
When a database connection is created by Geneos (whether through DBLogging or SQLToolkit), the initial isolation level is indeed set to REPEATABLE_READ - this is explicit and hard coded. You can, however, change the isolation level for a specific query:
For Sybase, for example, you can change the isolation level in the query:
Changing the isolation level for a query
For example, the following two statements query the same table at isolation levels 0 and 3, respectively:
(take from this site)