Oracle added alot of granularity to the 10g wait interface, but the documentation seems to be lacking. I tried googling, google groups, metalink, and otn and I can't really find any detail on this wait:

 

enq: SQ - contention

 

Looks like some kind of share lock contention(if I am reading it). I saw a vague reference in some powerpoint slides to ITL waits.  

 

I opened a TAR, but sometimes it takes a while to get a response. Does Oracle document the new waits anywhere?