Most employers are filling multiple job openings at the same time. This requires large volumes of resumes be reviewed relatively quickly. If you want your resume to receive proper consideration, make sure your cover letter clearly indicates the position you are applying for. This guarantees your resume will be forwarded to the proper recruiter in the shortest amount of time. A list of current job opening can often be found at an employer's web site.
Most employers require job seekers to provide a list of credible references.
Therefore, you should keep your references updated and informed and regarding your current roles and responsibilities. Keep in mind, references are also part of your overall job network. Many times they will know of positions within their organization before they are advertised. Generally speaking, a resume should be one page. The use of a second page can be justified if you have more than five years of work experience.