1. A method of indexing data and merging indexes within a database management system, in which the need for an in-memory table tracking currency of the data is eliminated, the method comprising: assigning a temporal indicator associated with a crawl to an instance of an index generated by the crawl, wherein the index is part of an indexing system of a database management system; assigning the instance of the index to a set of instances of the index to be merged; and validating the set of instances to be merged, generating a set of valid instances.