Financial regulators conducted an on-site inspection of the Tokyo Stock Exchange on Friday following a system failure that caused a full-day trade suspension earlier this month, Finance Minister Taro Aso said.
The Financial Services Agency is expected to examine the bourse's governing structure and also interview officials operating its systems about the details of the shutdown on Oct. 1.
In the worst outage since the TSE's trading system was fully computerized in 1999, the problem was caused by a memory issue in a server in its trading system and a failure of the auto-backup system that was blamed on a settings error, the bourse said.