No user-defined functions (UDFs).

No stack trace on core dump.

You cannot set this up as a master or a slave (no replication).

Very large result sets may be unusable on low memory systems.

You cannot connect to an embedded server from an outside process with sockets or TCP/IP. However, you can connect to an intermediate application, which in turn can connect to an embedded server on the behalf of a remote client or outside process.