Re: ASSM and high volume concurrent inserts

From: Surachart Opun <>
Date: Fri, 18 Dec 2009 01:21:10 +0700
Message-ID: <>

  • Allocate size Table on tablespace (avoid extend tablespace by auto) alter table ... allocate extent ...

or create use tablespace specify extent size(create tablespace with uniform extents)

- Partitioning Table/Index
-  Enough ITL on the block (INITRANS)
- No Indexing
- No integrity checks (Foreign keys, not null constraints)
- Increae Buffer cache (if it's to small you'll early end up with I/O)

Good Luck
Surachart Opun

On Fri, Dec 18, 2009 at 12:46 AM, Haroon A. Qureshi <> wrote:

> Hello,
> A client is running an application that does high volume concurrent inserts
> (> 200million rows). Performance degrades with high buffer busy waits. The
> tablespace is ASSM managed, so we can't change the freelists to tune it. I
> want to try moving to a manually managed tablespace and tune the freelists.
> But not sure if the client will go for that change, given the effort and
> timelines. Has anyone come across performance issues with ASSM and high
> volume inserts? Anyway of tuning it with ASSM?
> Thanks in advance,
> Haroon
> --

Received on Thu Dec 17 2009 - 12:21:10 CST

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