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IBM has published a fascinating benchmark using a 32-CPU processor server with a full terabyte of RAM: Oracle IBM terabyte RAM benchmark.

This benchmark achieved over 1.6 million transactions per minute (over 25,000 transactions per second) using a $8.4 million dollar server environment.
 

I highly recommend the book "Oracle Benchmarking" for more details on conducting and interpreting Oracle benchmarks.  This book is written by numerous Oracle tuning experts and shows a complete method for Oracle and SQL Server benchmarking

 

The most interesting part is the knowledge that hardware vendors spend a fortune making their benchmarks as fast as possible.  Reading these benchmark documents are a great way to get Oracle tuning tips and techniques.  This benchmark has the following characteristics:

 

1 ? Used multiple blocksizes (4k, 8k and 16k block sizes)

2 ? Used over 500 billions bytes for the data buffer cache

3 ? Used the Oracle KEEP pool (600 gigabytes)

4 ? Used hidden parameters

5 ? Turned-off CPU costing for the SQL optimizer (_optimizer_cost_model=io and _optimizer_cache_stats=0)

 

Large RAM regions - Foremost in this benchmark we see the use of very-large RAM memory regions for Oracle to cache the most frequently-used data, plus a 14 billion byte shared pool:

 

db_cache_size = 176000M
db_2k_cache_size = 2048M
db_16k_cache_size = 99000M
db_keep_cache_size = 600000M
db_recycle_cache_size = 64000M

shared_pool_size = 14000M

 

It?s also interesting that the benchmark uses a over 500 megabytes NUMA pool (non-uniform memory access) to leverage the super-fast T2 RAM that is localized near each CPU:

 

_NUMA_pool_size = 536870912

 

Undocumented parameters - We also see numerous undocumented Oracle parameters.  The Oracle10g database has loads of undocumented parameters and only the super-experts dare to use them because they are unsupported and risky.  However, when the stakes are high (selling multi-million dollar servers), they can be very useful:

 

_NUMA_pool_size = 536870912
_collect_undo_stats=false
_awr_restrict_mode=true
_db_writer_flush_imu=false
_db_cache_pre_warm=FALSE
_undo_autotune = false
_imu_pools = 358
_optimizer_cache_stats = false
_optimizer_cost_model = io
_cursor_cache_frame_bind_memory = true
_db_writer_coalesce_area_size = 16777216
_kghdsidx_count = 1
_ksmg_granule_size=268435456
_two_pass=false
_session_idle_bit_latches=3000

 

Reading the TPC benchmarks at www.tpc.org is one of the best ways to see secrets for top-performance for your specific hardware and Oracle version.  Of course, make sure that you fully-understand the techniques (especially the undocumented parms) and that you thoroughly test all changes before trying them in a production environment.

If you like Oracle tuning, you may enjoy the new book "Oracle Tuning: The Definitive Reference", over 900 pages of BC's favorite tuning tips & scripts. 

You can buy it direct from the publisher for 30%-off and get instant access to the code depot of Oracle tuning scripts.


 

 

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Note: This Oracle documentation was created as a support and Oracle training reference for use by our DBA performance tuning consulting professionals.  Feel free to ask questions on our Oracle forum.

Verify experience! Anyone considering using the services of an Oracle support expert should independently investigate their credentials and experience, and not rely on advertisements and self-proclaimed expertise. All legitimate Oracle experts publish their Oracle qualifications.

Errata?  Oracle technology is changing and we strive to update our BC Oracle support information.  If you find an error or have a suggestion for improving our content, we would appreciate your feedback.  Just  e-mail:  

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