We are currently looking for contract DBAs and also a permanent full-time Senior DBA and I spent a good part of last week and this week reviewing resumes and conducting interviews.
Thankfully, there are a lot of interview questions out on the Internet. One of my senior DBA's favourite was "What was the most dangerous thing that you have done as a DBA?" and we get a wide ranging and variety of answers to that one. The good thing with this one is that there is no right or wrong answer but rather it provides us with an insight to the candidate's perspective of what is considered to be dangerous actions or actions that requires special attention and care.
We threw a few technical questions in the mix to allow us to gauge the level of technical expertise and knowledge of the candidates as we have found that 10 years spent creating database does not equate a senior level of knowledge and expertise as a DBA. Other questions are designed to identify the candidate's natural behaviour under stress or their thought processes in identifying and resolving issues.
One thing for sure is that it is practically impossible to judge simply from the resume but we still use the resume as our filtering mechanism on who should be interviewed and who shouldn't. I normally scan the resume for the type of work and organization that the candidate has worked for in the past where they picked up their DBA experience. For example, if someone put down that they spent 3 months at a small organization and was heavily involved in implementing RAC, 10gAS, DataGuard, replication, tuning, OEM, OID, RMAN, etc., then I got to question how much experience was picked up for each individual technology within the 3-month period. The other thing that I watched out for is whether someone spent the whole period doing DBA work or whether it was a combination of DBA, System Administration and/or Development work.
I can tell you that it is still a hit and miss exercise as one of my contract "hires" turned out to be a dud and I am still searching for the perfect process to hire the right person.