Library Cache Lock

This post is a space holder for "Library Cache Lock" wait event.  It will be expanded later with more information.
1 Process hung on library cache lock
2 Oracle Library Cache
   Part I
   Part II
3 Library cache lock and library cache pin waits
4 Resolving a library cache lock issue
5 Systematic Latch Contention Troubleshooting in Oracle
6 Row Exclusive vs. Share - What is the difference between the following types of locks? [ID 266720.1]