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A database transaction symbolizes a unit of work, performed within a database management system (or similar system) against a database, that is treated in a coherent and reliable way independent of other transactions. A transaction generally represents any change in a database. Transactions in a database environment have two main purposes:
chemical database substances CAS Search; suppliers "Chemindex". Clival Database Clinical Trail Database Clinical Trail Data Solutions 50,000 molecules clinical trail data Phase 0 to IV indications "clival". CMNPD Comprehensive Marine Natural Products Database Peking University: from literature and other databases structural classification; species
A chemical database is a database specifically designed to store chemical information. This information is about chemical and crystal structures , spectra, reactions and syntheses, and thermophysical data.
Transactional database may refer to: Operational database of customer transactions; Database transaction - a transactional database could be one that is ACID-compliant for each database transaction; Navigational database [citation needed
The guarantee that any transactions started in the future necessarily see the effects of other transactions committed in the past. [ 7 ] [ 8 ] As these various definitions are not mutually exclusive, it is possible to design a system that guarantees "consistency" in every sense of the word, as most relational database management systems in ...
In data management, dynamic data or transactional data is information that is periodically updated, meaning it changes asynchronously over time as new information becomes available. The concept is important in data management, [ citation needed ] since the time scale of the data determines how it is processed and stored.
A database is an organized collection of data. Databases offer fast retrieval times for non-structured requests as in a typical transaction processing application. Databases for transaction processing may be constructed using hierarchical, network, or relational structures. Hierarchical structure: organizes data in a series of levels.
Isolation ensures that concurrent execution of transactions leaves the database in the same state that would have been obtained if the transactions were executed sequentially. Isolation is the main goal of concurrency control ; depending on the isolation level used, the effects of an incomplete transaction might not be visible to other ...