Code coverage means, how well your test set is covering your source code. i.e. to what extent is the source code covered by the set of Test cases. As mentioned in above answers, there are various coverage criteria, like paths, conditions, functions, statements, etc.
Chiasmus. Definition: Chiasmus is a specific type of parallelism. It consists of two parallel phrases in which corresponding words or phrases are placed in the opposite order.
I/O query parallelism was the first variety of parallelism. It was delivered in DB2 Version 3 and allowed a single CP to process multiple I/Osâfetching multiple pages into the buffer pool in parallel. Today, I/O parallelism is infrequently observed. I/O parallelism is also not zIIP-eligible.