Software bug crashes Japanese stock exchange

Tokyo, we have a problem

Robert Jaques

The Tokyo Stock Exchange suffered its worst ever outage yesterday when trading was suspended for four and a half hours due to a software problem.

A spokesman said that the glitch appeared to be connected to the decision to expand the trading system's capacity last month in response to high trading volumes.

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The modified system had worked well, but crashed when the automatic monthly clean-up of the software was implemented. A back-up system also failed because it uses the same software.

The suspension was particularly embarrassing in light of current plans for a flotation of the exchange, although trading volumes were healthy in the remaining time available.

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