Oracle Corp. came close to acquiring Micros Systems Inc., a maker of software for stores and restaurants, six years ago. Micros Chief Executive Officer Tom Giannopoulos flew from Maryland to California to sign a deal, only to have the transaction fall through at the last minute, according to a person with knowledge of the matter.

Now Oracle CEO Larry Ellison is again trying to buy Micros, this time for more than $5 billion, people familiar with the deal said yesterday. This would be his largest acquisition since buying Sun Microsystems Inc. in 2010.

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