what is transparency in distributed database system

... coordinates (0, 1, 0, 1). The following is a compact representation of this request in QUEL: 2 installation wants at the time the DBMS is installed. In this case, all routines could be linked into ... into the INGRES address space. The system was described in [ONG84]. Our initial experience with the system is that dynamic linking is not preferable to static linking. One problem is that initial ... run time system at system installation time by the linker provided by the operating system. Of course, a data base system implemented as a single server process with internal multitasking would...

Ngày tải lên: 22/10/2013, 10:15

... maintain a distributed database system. Chapter 2, Distributed Database Administration” This chapter discusses issues of concern to the database administrator (DBA) imple- menting or maintaining ... database in the system to ease the configuration of distributed database access. Databases and Database Links Each database in a distributed database is distinct from all other databases in the system ... 2-1 2 Distributed Database Administration This chapter discusses issues of concern to the database administrator (DBA) implementing or maintaining distributed databases. Topics covered include: ■...

Ngày tải lên: 17/01/2014, 09:20

... typed English sentences) to various kinds of information systems. At one end of this spectrum is simple, single database query, in which the translation from NL to the db system is quite direct. ... problem is one of using typed English to access and/or update a file or files in a single database system, let us define a spectrum of potential natural language interfaces (limiting that ... display, update, and interaction in which the system acts like a helpful, intelligent, knowledgeable assistant. In this situation, the user carries on a dialogue (perhaps using speech) using...

Ngày tải lên: 21/02/2014, 20:20

... database in the system to ease the configuration of distributed database access. Databases and Database Links Each database in a distributed database is distinct from all other databases in the system ... B-5 DBMS_HS.DROP_INST_INIT B-6 Oracle’s Distributed Database Architecture 1-4 Oracle8 Distributed Database Systems The Network To link the individual databases of a distributed database system, a network is necessary. ... 5-2 Controlling Connections Established by Database Links 5-2 Referential Integrity in a Distributed System 5-3 Distributed Queries 5-3 Tuning Distributed Queries 5-3 Handling Errors in Remote...

Ngày tải lên: 07/03/2014, 23:20

Ngày tải lên: 22/03/2014, 15:21

Ngày tải lên: 23/03/2014, 12:20

Ngày tải lên: 30/03/2014, 13:20

Ngày tải lên: 09/08/2014, 14:22

... Server. This will be demonstrated in later chapters. 2 Chapter What Is the Managed Preferences System? You’re reading this book, so it’s likely that you have some inkling of what the ... some scripting may be involved. We’ll present some sample scripts, and do our best to explain what is going on in them, but we can’t cover shell scripting in depth in this book.  The desire ... used or understood by many Macintosh administrators. If you’re willing, though, you’ll find it isn’t difficult at all, and it can make your job as a system administrator much easier. Nicely,...

Ngày tải lên: 21/10/2013, 22:20

... DHT in SQPeer is based not on data values but on peer views, thus providing efficient intensional indexing and routing capabilities. Other projects address mainly query routing issues in SONs. In ... maintaining (XML or RDF) extensional indices of entire peer bases is important compared to the cost of maintaining inten- sional peer views, as in the case of SQPeer. In addition, SQPeer’s interleaved execution ... the query and combining the results at the peer launching the initial query. This approach ignores RDF/S schema information during query routing, while distributed query planning and execution...

Ngày tải lên: 19/02/2014, 12:20

... Node autonomy in distributed systems. In Proceedings of the International Symposium on Databases in Parallel and Distributed Systems (Austin, Tex., Dec.), pp. 158-166. GARCIA-Mã LINA, H., AND ... be handled by construct- ing processors include the following: Schema integration: Integrating mul- tiple schemes into a single schema Negotiation: Determining what proto- col should be ... uniformly. In contrast to a federated database system, a nonfederated database system does not dis- tinguish local and nonlocal users. A partic- ular type of nonfederated database system in which...

Ngày tải lên: 20/02/2014, 05:21

... relationships is G T inside ∪ {A inside A |A is any involved object}, denoted by INSIDE. It is clear that G inside is inconsistent if and only if G inside is cyclic, if and only if G T inside contains ... point in p(B). ã p satisfies the relationship A behind B, stating that A is behind B in the picture p, iff the z-coordinate of each point in p(A) is greater than the z- coordinate of each point in ... Mechanism, Consistency Check- ing Mechanism, Image Indexing, Spatial Reasoning, Database, Image Matching, and Human-Computer Interface. Figure 1 is the block diagram of a Content-based Image Database...

Ngày tải lên: 07/03/2014, 14:20

... databases entirely resident in m ain m emory [28]. The reasoning was that a major disadvantage of deterministic database systems relative to traditional nondeterministic systems is that nondeterministic sys- tems ... execution. Calvin avoids this disadvantage of determinism in the context of disk-based databases by following its guiding design principle: move as much as possible of the heavy lifting to earlier in the ... used in the discussion of caching in our earlier discussion of memory- vs. disk-based storage engines. If the worker thread is executing at a passively participating node, then it is finished...

Ngày tải lên: 07/03/2014, 14:20

... engineering database systems investigated in the remainder of this section. 3.1 The (Pure) Relational Database Systems In the introduction to this paper we cited a few reasons why database management ... distributed eneineerine data management system. In Proceedings 07 the ASCHE Conference (Dallas, Tex.). FOGG, D. 1982. Implementation of domain abstrac- tion in the relational database system ... An Analysis of Geometric Modeling in Database Systems 4. Conclusions In the first part of this paper we investigated the requirements imposed on database management systems by computer-aided...

Ngày tải lên: 07/03/2014, 23:20

... mechanism remains unclear. The advantage of this procedure is that it provides infor- mation about the unconstrained flows possible in this scheme. In other words, this simplified model furnishes an ... also shuttles the reducing equivalents into the cytosol where it is needed for glucose synthesis [3]. In concluding, it is instructive to compare our approach for estimating intramitochondrial flows ... which minimal value of x this choice of c is still within the conversion cone. This minimal pyruvate uptake is found to be x ẳ 19.25 lmoles because for this choice the last inequality in H holds...

Ngày tải lên: 16/03/2014, 14:20

... starting point and updates the in- memory indexes accordingly. If the LSN of the log entry is greater than the corresponding index entry in the index, then the pointer in the index entry is updated ... in both systems. The performance of LogBase is su- perior to HBase, because LogBase maintains a dense in- memory index and each record has a corresponding index entry containing its location in ... record in the log. The index of each tablet can be maintained in memory since the size of an index entry is much smaller than the record’s size. The in- memory index is especially useful for handling...

Ngày tải lên: 16/03/2014, 16:20

... availability: To- wards a deeper understanding of machine failure characteristics in large distributed systems. In WORLDS ’04: First Workshop on Real, Large Distributed Systems (2004). [11] CHUN, B G., ... of distributed brick storage systems. In ICDCS ’05: Proceedings of the 25th IEEE International Con- ference on Distributed Computing Systems (2005), pp. 187–196. [22] MCKUSICK, M. K., AND QUINLAN, ... centers are independent, that is, that they lack a single point of failure such as a shared power plant or network link. Ad- 9 Availability in Globally Distributed Storage Systems Daniel Ford, Francáois...

Ngày tải lên: 16/03/2014, 19:20

... avoid disincentives. It included 47 studies of consumer incentives for preventive care, including 7 pertaining to obesity and weight loss (all of which are included in this synthesis.) Of all ... concerning the effectiveness of economic instruments in containing or reducing food consumption, particularly of foods high in saturated fats. This synthesis also covers indirect evidence pertaining ... Jain (32) of a wide range of interventions for preventing and reducing obesity included a small set of articles addressing weight loss in the workplace, including several studies that What is...

Ngày tải lên: 17/03/2014, 08:20

... In prostate tests PSA what is the difference between total PSA and free PSA? What is the normal range? In addition, how can it be that if there is ANY prostate specific antigen in the ... a minimum life expectancy of 10 years. [3] Although PSA is cleared by the Food and Drug Administration for monitoring patients with prostate cancer for disease recurrence, it is unique in ... continue to rise over time, other tests may be indicated. A man should discuss elevated PSA test results with his doctor. There are many possible reasons for an elevated PSA level, including...

Ngày tải lên: 21/03/2014, 12:19

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