Aesthete
发表于 2025-3-28 15:46:40
Christopher P. Mattison,Mark Wineyoversion databases, a multiversion database represents several states of the modeled universe. Thus, both the notion of consistency and the means to maintain it have to be extended. To this aim, we consider new integrity constraints induced by versioning. Constraints are characterized according to s
无弹性
发表于 2025-3-28 20:47:47
https://doi.org/10.1007/978-1-60327-153-0y performing integrity tests against the database whenever an update occurs. The integrity test is much cheaper and easier to validate than the initial constraint. We use a two level approach where constraint validation can be performed before or after an update is made. We adopt the algorithm propo
receptors
发表于 2025-3-28 23:59:43
Antonio Giordano M.D.,Umberto Galderisiis thus the source of tension between confidentiality and integrity. Only discretionary confidentiality models which independantly grant the READ and the UPDATE privileges on data items and transition rules (a special case of transition integrity constraints) are considered here. Because of a relati
词汇表
发表于 2025-3-29 05:24:26
Marrow Stromal Mesenchymal Stem Cellstation can be used to give high level abstract requirements, or more detailed implementation level designs, and an additional refinement notation can be used to describe how specifications at different levels relate to one another. Tools to support the use of the notation, through a natural language
冒失
发表于 2025-3-29 09:42:16
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躺下残杀
发表于 2025-3-29 12:56:20
Ronglih Liao,Regina L. Sohn M.D., Ph.D.cing enables performance improvements by equalizing the load over the available computer nodes. In the project head, methods of load sharing and load balancing are used to control the multiprogramming level. The allocation of free operators is used to achieve an optimal processing of complex queries
责任
发表于 2025-3-29 19:07:58
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眉毛
发表于 2025-3-29 21:12:41
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1FAWN
发表于 2025-3-30 01:38:28
Large-Scale Mitotic Cell Synchronization,ut the ways in which values and entities in the database are related to each other. These associational facilities work by treating the database as a graph and following all the arcs from a node or finding paths between nodes. The nodes of the database graph correspond to entities or values in the a
foppish
发表于 2025-3-30 07:57:26
Jennifer A. Fischer,Salvatore J. Caradonnad relative temporal facts which may be declared at multiple and even mixed levels of granularity in a uniform, natural, and unambiguous manner. We use the SQL query language as the basis for the SQL+i query language, utilising a temporal algebra whose aim is to reduce any periods of indeterminacy to