Dimension Data said the preliminary agreement -- subject to completion of due diligence -- did not encompass purchase of SQL Services' former subsidiary, Databank, which will continue to trade independently.
Steve Nola, the chief executive officer of Dimension Data, said the decision to acquire the company was "based on the high degree of strategic fit with Dimension Data's local and global data centre solutions business".
He said SecureData's core skill-sets in databases, servers and operating systems, storage, security, backup, recovery and replication, would help enhance Dimension Data's offerings in Australia.
"Additionally, the acquisition of the intellectual property associated with the managed database services provides Dimension Data with the opportunity to leverage this capability on a global scale," Nola said.
The acquisition means Dimension Data would acquire a 51 percent shareholding in SQL Services in New Zealand.