One thing you have to consider though, is your area of expertise. No one can know the entire system, so it's good to pick a "layer" to concentrate on.
As a first point, make sure the weekly EarlyWatch alerts are being generated. This takes a snapshot of a lot of performance data from your system, uploads it to SAP, then gives you a summary report back (in your Inbox on the Service Marketplace). The recommendations are fairly standard as they come from an automated system, but the point to OSS notes and other things to guide you through the corrective actions.
As far as the "layers", consider OS, Database, or Application as three areas to focus on.
- From an OS perspective, focus on memory usage, I/O (disk) access, CPU utilization, and the number of work processes.
- From a database perspective, check the most common ratios, and also check the cursor cache stats in ST04 for the "worst" statements.
- From an application perspective, focus on online transactions with high response time and long-running background jobs.
Of course, this is only the tip of the iceberg, but it's a couple places you can dig into right away.
Marvin
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