15. A non-transitory computer-useable storage medium for automatically diagnosing a system problem, said medium having a computer-readable program, wherein a program upon being processed on a computer causes the computer to implement the steps of: creating a problem description index, wherein the problem description index is created from a group consisting of: a line-wise index comprising a document entry in the problem description index for each line in a problem description information of a plurality of previously diagnosed problems, a description-wise index comprising a document entry in the problem description index for the problem description information of each of a plurality of previously diagnosed problems, and a set-wise index comprising a document entry in the problem description index for each set of the problem description information of a plurality of previously diagnosed problems grouped together based on a problem cause; receiving the problem description index and problem description information of a new problem, the problem description index comprising problem description information of previously diagnosed problems, wherein said problem description information of previously diagnosed problems and of said new problem comprises text content describing system events that have occurred; comparing problem description information of the new problem with problem description information in the problem description index, wherein comparing the problem description information of the new problem with problem description information in the problem description index for a line-wise index comprises a line-wise search of the line-wise index, wherein said line-wise search comprises searching each line of text content in the problem description index for each line of text content from the problem description information of the new problem; computing a search score for each document in the problem description index, wherein the search score is a measure of similarity between each document in the problem description index and the problem description information of the new problem; assigning a matching score to each of the previously diagnosed problems based on the search score, wherein the matching score is a measure of similarity between the new problem and each of the previously diagnosed problems; and determining a diagnosis of the new problem, wherein the diagnosis of the new problem is a diagnosis of at least one of the previously diagnosed problems.
22. The computer-useable storage medium of claim 15 , wherein assigning a matching score comprises processing the search score based on a similarity definition for noise reduction.