Extractors exist for reading information from the following sources:
Reading the MySQL binary log (binlog) directly from the disk and translating that content and session information into the THL. Using this method to read the binlog in it's different formats, such as the statement, row and mixed-based logging.
Remotely from MySQL server over a network, including reading from an Amazon RDS MySQL instance. This enables the replicator to read the information remotely, either on services where direct access to the binlog is not available, or where we cannot be installed.
Directly from Oracle up to Oracle 11g using the Oracle CDC system. The Change Data Capture solution within Oracle makes it possible to extract information from the tables within Oracle, although it's availability is limited and implies some overhead on the Oracle service, it can provide a flexible solution for extracting row-based information.