As record temperatures hit much of the UK on Tuesday, tech giants Google and Oracle suffered outages as cooling systems failed at London data centres. Data centres are large highly secure buildings that hold banks of computers and are the powerhouses behind many online services. But the concentrated .

"Following unseasonably high temperatures in the UK south (London) region, two cooler units in the data centre experienced a failure when they were required to operate above their design limits," the company wrote on a status page first spotted by The Register.