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Don Burleson Blog 








Oracle reactive monitoring tools

Oracle Tips by Burleson Consulting


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
_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


Reading the TPC benchmarks at 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.

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