Dabric terms

2023-11-17

• value: a single literal value such as a number, a string or a keyword
• row: a finite ordered sequence of values
• statement: a row consisting of entity id, attribute and value
• operator: "add" or "remove"
• index: ordered set of rows. All rows in an index are of the same length.
• change: a row and an operator. The operator tells wether the row should be added or removed from the index.
• datom: a row that ends with a transaction number and an operator
• temporal index: ordered set of datoms
• column: all values in a certain position in rows in an index
• column name: an identifier that uniquely identifies a column in an index

indexes

• source indexes are written directly
• derived indexes are defined by source indexes
• statement index has columns :entity, :attribute and :value
• relation index has arbitrary columns

transactions

• transaction: transaction number and a set of changes consering a specific index
• transaction log: a sequence of transactions consering a specific index
• monotonic transaction log: a transaction log where all the changes contain only adds and no removals.

This site is generated with zetgen