It enhanced the indexing algorithms and introduced the notion of filtered indexes. DB2 9.7 added data compression for database indexes, temporary tables, and large objects. DDL statements create and modify database objects such as tables, indexes, and users. Values can be stored and retrieved as numeric indexes or string values. LEAPS are available on approximately 2500 equities and 20 indexes. They generally contain similar information to the main GRO indexes and registers. Reviewing the query plan can present opportunities for new indexes or changes to existing indexes. There's also support for invisible indexes and persisting of global system variables. The Oracle implementation limits itself to using bitmap indexes. These would likely correspond to interface indexes, or possibly port numbers. Google indexes hundreds of terabytes of information from web pages. It also caches much of the content that it indexes. This page indexes the individual years pages. Spamdexing is the deliberate manipulation of search engine indexes. Economists measure these changes in prices with price indexes.