Figure 6-10. The OSM ipcbc.sql report shows the CBC-related instance parameters. This script output was the source of the data in Table 6-1.

If set, the number of buffers you want in the buffer cache (Oracle reserves the right to alter the actual number of buffers)

One of the best and easiest ways to cause CBC latch contention is to create a large buffer cache so your most active blocks are always cached, and then reduce the number of CBC latches to say, one. That should do it, except that Oracle is smart enough (at least starting with Oracle Database 10g) to not allow the number of CBC latches to drop below 1,024. But even with 1,024 latches and enough logical IO activity, you'll see plenty of CBC latch contention.