Amount of max possible simultaneous INSERTs depend on what ??

Hi all,
can somebody comment on following statement , whether its is absolutely true, only a part of the truth or completely wrong :
"The maximum possible amount of transactions that are simultaneously performing inserts into an Oracle- table is MAINLY constrained by the available ITL-slots of that table." (Assumption : Hardware performance identical)
Background : We have a mission critical table where every user performs inserts (some kind of an audit table). These inserts are part of the original business transaction and are -normally- very fast.
Problem is that the commit of the original business txn is only issued after populating this audit table.
We were asked how many hanging user transactions would be required in order to completely lock the table for further inserts and as a consequence completely hangup the application.
Cheers,
Mig

mbobak wrote:
2.) You didn't mention version, or whether you're using ASSM, but, if you're still using MSSM (free list managment), then you'll need to consider freelists as well. The freelists parameter should be set to the max concurrent number of inserts on a segment.
Mark,
I wasn't planning to go into details about how to configure the number of blocks available for insertion, but you're right: freelists is a significant setting, as is freelist groups. ASSM is roughly equivalent to just freelists 16 freelist groups 1 - which is why systems with very high rates of concurrent DML should seriously consider avoiding it.
P.S. Come to think of it, you're more likely to have trouble from buffer busy waits before you run into problems with ITL waits if you try increasing insertion concurrency by setting a high INITRANS.
Regards
Jonathan Lewis
http://jonathanlewis.wordpress.com
http://www.jlcomp.demon.co.uk
"Science is more than a body of knowledge; it is a way of thinking" Carl Sagan

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