The enterprise giant's stumble may not bode well for the technology sector -- and not just enterprise providers, but all big cap tech companies.

By Kevin Kelleher, contributor

FORTUNE - Oracle missing its earnings guidance is like Mariano Rivera blowing a save opportunity, or Bob Dylan putting out a disappointing record. It happens, but not very often. And when it does, the only real question is: Why?

The answer matters beyond the world of Oracle (ORCL) shareholders. Oracle has long been seen as a kind of proxy for corporate spending on information technology. If Oracle's earnings disappointed because of internal problems, that's not such a big deal outside Oracle. If Oracle didn't do much wrong, however, it points to a possible slowdown in IT spending for next year.

So what happened? The enterprise software giant weighed in earlier this week with revenue of $8.8 billion in the three months ended Nov. 30, up 2% from the same period a year earlier but short of the $9.2 billion analysts were expecting. Similarly, non-GAAP earnings per share came in at 54 cents, below the 57 cents the Street had been looking for.

Oracle hasn't fallen short of estimates for at least three years -- a feat all the more significant given the weak economy. As of Tuesday's close, before the company posted its earnings, Oracle had gained 64% over the past three years, against a 40% rise in the S&P 500.

On Wednesday, the stock tumbled 12%. In the past six weeks, the stock has lost nearly a quarter of its value, equal to roughly $40 billion. The S&P 500 is down only 2% in the period. And other software stocks are being dragged down in Oracle's wake: Salesforce.com (CRM) fell 5% Wednesday, SAP (SAP) dropped 6% and VMWare (VMW) slid 10%.

Even as the financial turmoil in Europe and overheated economies in Asia have raised concerns about another global recession in 2012, the tech world has seemed somewhat immune. Most of the discussion focused on the consumer side of the industry -- the ongoing rivalry between Apple (AAPL) and Google (GOOG), the rise of Amazon's (AMZN) tablet, the fate of Zynga's (ZNGA) IPO. The enterprise side is much less visible and -- frankly -- a little unglamorous, but just as important as the consumer side.

And if companies are putting the brakes on IT spending, it could hurt tech stocks across the board. The relative resilience of Oracle's stock and its ability to consistently trump the Street's estimates gave the company an aura of safety. Here was a tech giant that could weather hard times. And if Oracle is feeling a chill in IT spending, what are other software vendors feeling?

The conventional wisdom is that enterprise software can help companies reduce some long-term operating costs in departments such as human resources and customer relations. Cloud computing, an area that Oracle has been pushing into, can also reduce IT costs by handing over storage and maintenance functions to companies that can run vast networks that benefit from economies of scale.

So if companies are growing stingier about their enterprise software budgets, it could signal they are starting to cut closer to the bone. Oracle CFO Safra Catz said that it's taking some of its clients longer to approve projects. "All of a sudden the CEO had to approve it or something like that, where before it was all set," Catz said. Though, she stressed that she hadn't been told yet that any companies were reducing their IT budgets. "Clearly, this quarter was not as we thought it would be, and we've been taking a look at the deals that really should have closed and that would have closed but for some sort of irregular environment."

On the one hand, it's unrealistic to expect a company like Oracle to offer investors an economic forecast. On the other, it's hard to read a phrase like "some sort of irregular environment" and not wonder what exactly it means. Is it a one-time quirk in Oracle's accounting - an aberration that will be corrected next quarter? Or is it something more serious?

The notion that Oracle's irregular environment was limited to last quarter was undermined when the company offered guidance. The company said the current quarter's revenue would grow between 1% and 5% on year, or to between $8.9 billion and $9.3 billion -- below the analysts' consensus of $9.5 billion -- while earnings per share would be between 56 cents and 59 cents, against the Street's 59 cents.

That left some analysts worried enough that three of them -- Societe Generale, Canaccord Genuity and CLSA Asia-Pacific Markets -- cut their ratings on the stock Wednesday. But Canaccord felt that Oracle's challenges were unique to the company. "Oracle missed because some buyers waited for a new hardware upgrade, and on the software front the firm is behind the curve in cloud applications," wrote analyst Richard Davis. "We expect Oracle to catch up, but it will be through some R&D and a lot of M&A."

But other analysts suggested Oracle may be the canary in an unhealthy coal mine. Bank of America's Kash Rangan wondered if the tighter approval process Catz mentioned "could be a broader trend for software." Deutsche Bank's Tom Ernst said he "saw uncharacteristic weakness across all segments and geographies, which we find a bit puzzling... Outside of the severely contracting macro environment of the last recession, it is rare to see such low growth rates for all geographic regions."

So which is it? Has Oracle hit a speed bump as it transitions to new hardware and cloud computing offerings? Or is it the first warning sign of an unexpected contraction in corporate IT spending in the face of global economic uncertainty?

Other companies will offer more clues. On Wednesday, Tibco (TIBX), a cloud computing company, said it earned 42 cents a share last quarter, above the Street's 35-cent estimate. But the real test will come in mid-January when companies like SAP and IBM (IBM), another strong performer in tech over the past three years, are due report earnings.

If it turns out Oracle was the exception, this week's drop in software shares could prove to be a buying opportunity for bulls. But if Oracle is the first sign of a slowdown, the tech world could be in for a rough start in 2012.