High CPU load on Oracle when executing select on TT

Hello. I have grid cache: 2 instances of global TT + Oracle with async dynamic writing group of cache on a single table with 1 million entries. Each instance of grid cache is located on its own host. I start the execution performance test only on instances of TT SELECT queries. Now, I see that the process Oracle starts consuming a lot of time CPU. According to the documentation (if I understand correctly) all db readings are performed between instances of TT. That fact Oracle when I run select TT? In case that we to scale horizontally by adding instances TT Oracle doesn't become a bottleneck?

A few points:

1 data movement between grid mnodes requires that we update some informaiton in oracle (via the replication agent). Thi is probably what is causimng load you see you on Oracle.

2. a load of work that creates a lot of data movement will not run and will not well. This isn't a good way to use the grid of the cache. You should 'soft partition' workload
so that the connections on a member of the grid work preferentially on a (mostly) disjoint subset of data compoared connctions to members of grid President.

3. If you plan to work intensively with grid you hould reallly use the latest major version (11.2.2) not old enough now 11.2.1. There has been many improvements,
bug fixes etc since 11.2.1.8.0.

Chris

Tags: Database

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