Tài liệu Managing time in relational databases- P2 pptx
Tài liệu Managing time in relational databases- P2 pptx
... management losingfaith in data warehouse projects. As these large projects fellincreasingly behind schedule and rose increasingly over budget—something large projects tend to do—the pressure increasedto ... concepts. Managing Time in Relational Databases. Doi: 10.1016/B978-0-12-375041-9.00001-7Copyright#2010 Elsevier Inc. All rights of reproduction in any form reserved.11PART1AN INTRODUCTION ... it how they think of warehouses and marts Managing Time in Relational Databases. Doi: 10.1016/B978-0-12-375041-9.00023-6Copyright#2010 Elsevier Inc. All rights of reproduction in any form reserved.1contains...
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Tài liệu Managing time in relational databases- P4 pptx
... lacking a standard for the PERIOD datatype, wewill continue the practice of defining periods of time in terms of their begin and endpoints in time. Chapter 3 THE ORIGINS OF ASSERTED VERSIONING: ... record of when business events happen in the realworld. In addition, for most business purposes, we assume that aSQL timestamp plus a defined interval of time will result in asecond timestamp that ... designing andmaintaining data models that must explicitly define temporaldata structures and integrity constraints on them. It alsorelieves developers of the burden of designing, writing andmaintaining...
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Tài liệu Managing time in relational databases- P5 pptx
... whether a point in time is or is not contained in a period of time. Where P and Tare, respectively, a point in time and a period of time, and T1andT2are dates delimiting T using the closed-open ... [aligns] with the time period,then it either [starts] the time period or [finishes] it. Otherwise,the point in time occurs [during] the time period. If the point in time [excludes] the time period, ... clock ticks. Thispoint in time may either [intersect] or [exclude] the time period.If the point in time [intersects] the time period, it also [fills] and[occupies] that time period. If it...
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Tài liệu Managing time in relational databases- P6 pptx
... point in time 1All effective time relationships exist within shared assertion time. Because this is soimportant to keep in mind, we will often add the qualifier “within shared assertion time ... Versioning In this variation on versioning, a logical delete flag is included in the version table. It has two values, one marking the row asnot being a delete, and the other marking the row as being ... VERSIONING97for version tables—a time period which we call assertion time, and computer scientists call transaction time effective time versioning adds a single date. Next, instead of adding this...
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Tài liệu Managing time in relational databases- P8 pptx
... assertion time andeffective time is that two or more effective -time [intersecting]versions of the same object, in shared assertion time, would vio-late temporal entity integrity, making conflicting ... repre-sentation of a timeline and a snapshot of effective time periods,grouped by common assertion times along that timeline. Withthe in- line notation, that context, too, is not represented.Viewing the ... withinshared assertion time, even a single effective -time clock tickincluded in another version of that object already in the table.Most physical transactions against bi-temporal tables areinserts....
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Tài liệu Managing time in relational databases- P15 pptx
... asserted, what information doesit contain that would justify retaining it in the database? Well, in fact, a row in empty assertion time is informative. The informa-tion it contains is information ... along the inflow pipelines whose terminationpoints are production tables, or along the outflow pipelineswhose points of origin are those same tables. The points of ori-gin of inflow pipelines may ... Havingnowhere in past assertion time to go, and obviously not belong-ing in current assertion time, it went to the only place it couldgo—into non-asserted time, i.e. into empty assertion time. A...
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Tài liệu Managing time in relational databases- P24 pptx
... 308–309Pipelinesconcept of, 268data, 269inflow, 268lost data and, 295–296outflow, 268PK. See Primary keyPoint in time, queries, 382–383to Period of time, 333–341to Point in time, 341–342Point in ... in time 1[before] Period 1, 338–339,339f[before] Period 1, inverse ofrelationship, 338–339[before] Point in time 2, 341,342f[before] Point in time 2,inverse of relationship,341[during] ... 237temporal insert transactionand, 235V_Allen_Example to illustrate,315–316Allen relationship queries,313–342claims processing example,343–346point in time to period of time, 333–341point in time...
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Tài liệu Managing time in relational databases- P1 ppt
... data in which none of that isnecessary, a world in which all pipeline datasets are contained in the single table that is their destination or their point of origin. In this world, maintaining ... systems used in education,finance, health care, insurance, manufacturing, retailing andtransportation—all industries in which the authors have hadconsulting experience. In using these methods, ... along inflow pipelines, and posted transactionsas data destined for some kind of logfile, and as moving towardsthat destination along outflow pipelines. So if we can bringpending transactions into...
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Tài liệu Managing time in relational databases- P3 doc
... point in time forward to the point in time we are interested in. But the defining feature of reconstructable methods is not themovement of data from off-line to on-line storage. The defining ... anypoint in time between the starting balance and the current bal-ance by going back to the starting balance and applying trans-actions, in chronological sequence, up to the desired point.We ... adifference in emphasis which may vary depending on context. Managing Time in Relational Databases. Doi: 10.1016/B978-0-12-375041-9.00002-9Copyright#2010 Elsevier Inc. All rights of reproduction in...
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Tài liệu Managing time in relational databases- P7 pdf
... truth.Temporal Integrity ConstraintsThe three integrity constraints in relational theory are entityintegrity, referential integrity and domain integrity. Entity integ-rity insures that the ... effective time than assertion time, we also present an in- line notation for single asserted Managing Time in Relational Databases. Doi: 10.1016/B978-0-12-375041-9.00006-6Copyright#2010 Elsevier Inc. ... eitherassertion time or effective time on their insert, update or deletetransactions, it will seem to them that they are maintaining data in a conventional table. This maintenance is not done by writingSQL...
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