Search results
Results from the WOW.Com Content Network
Original file (885 × 1,243 pixels, file size: 52.18 MB, MIME type: application/pdf, 570 pages) This is a file from the Wikimedia Commons . Information from its description page there is shown below.
In the fields of databases and transaction processing (transaction management), a schedule (or history) of a system is an abstract model to describe the order of executions in a set of transactions running in the system.
In computer science, the five-minute rule is a rule of thumb for deciding whether a data item should be kept in memory, or stored on disk and read back into memory when required. It was first formulated by Jim Gray and Gianfranco Putzolu in 1985, [ 1 ] [ 2 ] and then subsequently revised in 1997 [ 3 ] and 2007 [ 4 ] to reflect changes in the ...
Codd's twelve rules [1] are a set of thirteen rules (numbered zero to twelve) proposed by Edgar F. Codd, a pioneer of the relational model for databases, designed to define what is required from a database management system in order for it to be considered relational, i.e., a relational database management system (RDBMS).
Original file (854 × 1,191 pixels, file size: 77.36 MB, MIME type: application/pdf, 566 pages) This is a file from the Wikimedia Commons . Information from its description page there is shown below.
This is often a stop-the-world process that traverses a whole table and rewrites it with the last version of each data item. PostgreSQL can use this approach with its VACUUM FREEZE process. Other databases split the storage blocks into two parts: the data part and an undo log. The data part always keeps the last committed version.
A deductive database is a database system that can make deductions (i.e. conclude additional facts) based on rules and facts stored in its database. Datalog is the language typically used to specify facts, rules and queries in deductive databases.
On March 22, 2011, Oracle announced it had decided to end all software development on the Itanium, and that Oracle Rdb 7.3 would be the last major version released by Oracle. Due to a lawsuit filed by HP against Oracle , Oracle was ordered to continue porting its software to Itanium computers for as long as HP (now Hewlett Packard Enterprise ...