Career as a DBA

Database Administration comes into play in medium large and large enpterprises and organizations running database server boxes where the business can not tolerate downtime and data availability is very critical.
Such setups involve expensive hardware and an enterprise class DBMS solution , eg., MSSQL Enteprise Edition, ORACLE Enterprise Edition etc.
Usually the server boxes include SAN(Storage Area Network) or NAS(Network Area Storage) setup as clusters and connected to multiple active/active or active/passive server boxes. The SAN usually connects to the server through a Host Bus Adapter and the medium could be Fiber Channel or some other fast communication channel.
NAS connects to the server via a Switch and has much more flexibility of placing it physically farther than the servers.
The disk drives in NAS, SAN, or the Server itself are fast SATA or SCSIs disks bundled up in different level of hardware RAIDS for faster read/writes and fault tolerance.
Many people focus more on multiple high speed processors with not quite edequate L2 Cache. As a general rule of thumb, a PIII processor running on a board with greator L2 Cache would outperform a P4 Processor running with inadequate L2 Cache.
A DBAs task also involves selecting and configuring RAIDs to serve different kind of I/O activity; example is that you require different RAID for sequential Reads/Writes and different for non sequential Reads/Writes. One also needs to accommodate the fault tolerance.
Technically speaking, DBAs are most prone to waking up nights and staying long at office for backups , performance and downtime issues. The business stucks if the db server goes down; that adds your value to your organization more than a Developer(no offence). DBA is a hot and fun job, but you also take stress along with you at home with a fear of being called late night for assistance:)

A DBA tasks include:
Disaster Recovery Plans (including backups, restore testing)
Performance Tuning (Includes hardware and Server performance monitoring, SQL optimization)
Development (TSQL or PLSQL, whatever dbms you have)
Security (Audits, user roles and permissions, patterns of transactions etc)
Reporting (Reports server, including automation of reports for management and staff)

As of my past experience Databases are most prone to DBAs than any thing; to err is human :). I don't believe if any of the db gurus never caught up in a disasterous situation of a messed up database, the quality that seperates them from ordinary db guys is, how confidently they react by keeping the nerves in control and resolving the problem in best possible way with minimum down time.
Many smart and compitent Tecchy folks turn to the DARK END; the so called MANAGEMENT. As it's said, when you get technically experienced and older in your field; your technical skills become secondary to your management skills. Your spoken and writting skills, dressing and attitude decides how far you'll go.
Or in other words; Degree of Management Skills is INVERSELY proportional to that of Technical Skills.:)


Cheers!