DUTIES FOR SYSTEM ADMINISTRATOR

Duties of a system administrator
A system administrator's responsibilities typically include:
• Morning checks of systems/software.
• Performing backups of data.
• Applying operating system updates, and configuration changes.
• Installing and configuring new hardware/software.
• Adding/deleting/modifying user account information, resetting passwords, etc.
• Answering technical queries.
• Responsibility for security.
• Responsibility for documenting the configuration of the system.
• Troubleshooting any reported problems.
• System performance tuning.
• Keeping the network up and running.

Performance tuning
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Performance tuning is the improvement of system performance. This is typically a computer application, but the same methods can be applied to economic markets, bureaucracies or other complex systems. The motivation for such activity is called a performance problem, which can be real or anticipated. Most systems will respond to increased load with some degree of decreasing performance. A system's ability to accept higher load is called scalability, and modifying a system to handle a higher load is synonymous to performance tuning.
Systematic tuning follows these steps:
1. Assess the problem and establish numeric values that categorize acceptable behaviour.
2. Measure the performance of the system before modification.
3. Identify the part of the system that is critical for improving the performance. This is called the bottleneck.
4. Modify that part of the system to remove the bottleneck.
5. Measure the performance of the system after modification