Why MS SQL For Big PACS?

All the enterprise level PACS (Physical Access Control Systems) I deal with use Microsoft or Oracle SQL, which can be very cost prohibitive at times. Are there any enterprise level PACS vendors that have utilized open source database like PostgreSQL, Oracle’s MySQL, MariaDB, Apache Derby, or Firebird SQL? If not, why not? Seems to me that the first one to do this will be very cost competative

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