Quote: a temporal database can view tuples as seen from some time; captures history of retroactive/proactive change; sequence of historical states [»snodR9_1986]

Quote: a rollback database contains immutable snapshots indexed by time; can rollback the database to some time [»snodR9_1986]

Quote: a historical database records a single historical state per relation; supports valid time, i.e. current knowledge about the past [»snodR9_1986]

Quote: a history object is a directed graph of configuration objects; shows the history of a conceptual object [»walpJ6_1988]

Quote: a transaction object records a transaction in process; when committed, it becomes a configuration object in the naming structure (history object) [»walpJ6_1988]

Quote: a transaction-time database answers time-slice queries concerning the state of the database at a particular time [»lomeD_1993]

Quote: time domain addressing for transactions in immutable systems; two timestamps per version for created and last read [»walpJ6_1988]

Quote: with time-split b-trees, read-only transactions only need a timestamp for concurrency control; ignores all later records [»lomeD6_1989]

Quote: use time-split B-tree (TSB-tree) for time-slice queries of a transaction-time database; data clustered by time-slice and key; replicate historical versions as needed; store on WORM disk [»lomeD_1993]

Quote: time-split B-trees are space and time efficient; the fraction of redundant records is bounded [»lomeD_1993]

Quote: an order-dependent query depends on the order of the input records; e.g., a stock's five-price moving average [»lernA9_2003]

Quote: AQuery supports ordered data as a natural property; order-of-magnitude improvement

Quote: AQuery has order-preserving and order-cavalier operators over arrables (array-table) [»lernA9_2003]

Quote: AQuery matches ASSUMING ORDER in a query with ORDERED BY in an arrable table

Quote: AQuery variables and operators refer to arrays (a column); e.g., price - prev(price) is daily-change-in-price [»lernA9_2003]

Quote: time series analysis should be linear in time and sublinear in space; use data reduction/transformation, indexing methods, and flexible similarity searching [»shasD_2004]

Quote: StatStream monitors 30,000 time series data streams for statistics and highly correlated pairs; use DFT and grid files; easily parallelized [»shasD_2004]

Quote: consistency in immutable systems is a (named) consistent group of versions of related conceptual objects [»walpJ6_1988]

Quote: historical versions of a transaction-time database are never modified; store on WORM optical disk

Quote: Cosmos has immutable objects that are transformed into new objects by atomic actions [»walpJ6_1988]

Quote: use a transaction-time database for backup by time-splitting modified nodes [»lomeD_1993]

Quote: implement transaction-time database with commit-time timestamps and two-phase commit to agree on the transaction time; no extra message overhead [»lomeD_1993]

Quote: instead of using end-of-file, introduce end-of-day markers to initiate once a day processing [»jackMA5_1976]

Quote: databases may model reality but they ignore time-varying aspects, e.g. historical queries and trend analysis [»snodR9_1986]

Quote: conventional databases can not handle historical queries, trend analysis, retroactive changes, or proactive changes [»snodR9_1986]