Breadcrumb Home News News Latest news from NSF Unidata and the community Search Topic - Any -AWIPSCloudCommunityDataEventsGEMPAKIDVJobsLDMLDM-McIDASLibCFMcIDASMetPyNetCDFNetCDF-JavaNewsPythonRAMADDARosettaTDSUDUNITSUnidata Select an article category Indexes R'nt us Jun 7, 2011 Indexes vs. indexes. Gray's third requirement: 3. Intelligent indexes: for efficiently subsetting and filtering the data.