ExpressConnect for Oracle (ECO) is a library that is loaded by Replication Server 15.5 or later for Oracle replication.
It does not require a separate server process for starting up, monitoring, or administering.
Since Replication Server and ECO run within the same process, no SSL is needed between them, and also there is no requirement to configure settings previously covered in the ECDA for Oracle global configuration parameters.
Server connectivity is configured via Replication Server using the create connection and alter connection commands, thus there is no need to separately configure the equivalent to the ECDA for Oracle connect_string setting. See Replication Server Reference Manual.
Configuration of settings equivalent to the ECDA for Oracle service-specific settings such as text_chunksize, autocommit, array_size is also not required, as these settings are automatically determined by Replication Server (in some cases based on the Replication Agent input) and communicated to ECO.
Same set of datatype transformations.
Language and charset conversion between Sybase data and Oracle data. In ECO, this is configured using the map.cfg file.
Replication of empty strings in an ASE primary database to an Oracle replicate database, results in a string value of 1 or more (depending on whether the column is varchar or fixed char width datatype) blank spaces in Oracle.
ExpressConnect for Oracle requires only the tnsnames.ora file in order to establish location transparency. It does not require an interfaces file like ECDA for Oracle. You must specify the service name defined in the tnsnames.ora file for connection configuration.
See ExpressConnect for Oracle Installation and Configuration Guide for detailed information on ECO.