2012-12-17 11gR2 "Performance Tuning Guide" page 1 - 49
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Oracle Database 11g Release 2 (11.2.0.2) New Features in Oracle
Database Performance -- 11202新特性
Oracle Orion I/O Calibration Tool Documentation -- Oracle Orion I/O测试工具
Oracle Orion is a tool for predicting the performance of an Oracle database
without having to install Oracle or create a database. Unlike other I/O calibration
tools, Oracle Orion is expressly designed for simulating Oracle database I/O
workloads using the same I/O software stack as Oracle. Orion can also simulate
the effect of striping performed by Oracle Automatic Storage Management.
The Symptoms and the Problems -- 性能问题的征兆
-- Slow physical I/O -- IO缓慢
Generally, this is caused by poorly-configured disks. However, it could also be
caused by a significant amount of unnecessary physical I/O on those disks issued
by poorly-tuned SQL.
-- Latch contention -- 闩的争用
Rarely is latch contention tunable by reconfiguring the instance. Rather, latch
contention usually is resolved through application changes.
-- Excessive CPU usage -- CPU的过度使用
Excessive CPU usage usually means that there is little idle CPU on the system.
This could be caused by an inadequately-sized system, by untuned SQL
statements, or by inefficient application programs.
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