Both charges carry penalties of up to two years in prison.
Harris, who resigned as a constable from Counties Manukau Police in April last year, also faces a charge of cultivating cannabis.
Harris was a police officer stationed at Pukekohe from early 2007 and it is alleged he accessed the police database a month before his resignation.
Acting Assistant Commissioner Richard Chambers said there were strict controls on access to information held in the NIA, which holds information on a person's personal details and if they have criminal history.
"There is regular monitoring of NIA access including an audit carried out each month on approximately 75 randomly selected employees using the NIA database for that month," he said.
"These employees are required to justify their NIA access for that month."
Harris will be back before the court next month.