The realization of database sharing in substation automation system 變電站綜合自動化系統(tǒng)中數(shù)據(jù)共享的實(shí)現(xiàn)
Database sharing in substation comput er automaticsystem using visual basic 語言實(shí)現(xiàn)的變電站綜合自動化系統(tǒng)數(shù)據(jù)共享
Besides , it is highly efficient in a shipping environment that requires common database sharing and a central administration function 另外,它在需要有公共數(shù)據(jù)庫共享和集中管理功能的托運(yùn)環(huán)境中非常高效。
This will allow an additional 500 mb of memory available for database shared memory , pushing total utilization slightly above 2 gb to about 2 . 2 gb 這樣可以為數(shù)據(jù)庫共享內(nèi)存增加500 mb的可用內(nèi)存,從而使內(nèi)存使用總量從2 gb多一點(diǎn)兒增加到2 . 2 gb 。
Adapted to the requirements of high technology , cooperative action in battle and real - time information sharing in digitalized war , it puts emphasis research upon the key techniques of distributed heterogeneous data interoperation for military planning under network environment . using mts / com + mid - ware components , it realizes the distributed heterogeneous databases sharing , heterogeneous data interoperation and its process control in military battle planning 為適應(yīng)現(xiàn)代數(shù)字化戰(zhàn)爭技術(shù)含量高、多兵種協(xié)同作戰(zhàn)要求高以及作戰(zhàn)信息共享的實(shí)時性要求高的特點(diǎn),本文基于com dcom中間件技術(shù),重點(diǎn)研究網(wǎng)絡(luò)環(huán)境下面向軍事作戰(zhàn)規(guī)劃的分布式異構(gòu)數(shù)據(jù)互操作技術(shù),實(shí)現(xiàn)了軍事作戰(zhàn)規(guī)劃的分布式異構(gòu)數(shù)據(jù)共享及異構(gòu)數(shù)據(jù)互操作的過程規(guī)劃與控制。
Consequently , in this article , we propose a series of solutions of databases sharing and integration under internet . the solutions are composed of four parts : releasing of database profile description of sharing requirement releasing of requirement distilling and integration of information 鑒于此,本論文提出了網(wǎng)絡(luò)環(huán)境下數(shù)據(jù)庫共享與集成一體化解決方案,該方案通過四個步驟來實(shí)現(xiàn)數(shù)據(jù)庫共享與集成:數(shù)據(jù)庫概貌發(fā)布、 er模式共享需求描述、需求發(fā)布并提交到數(shù)據(jù)庫、信息提取與集成。
To be concluded , the main work done are : propose solutions of databases sharing and integration based on xml ; describe and release database profile by xml ; propose the idea of semantic e - r description pattern of requirement ; propose the model of commen sql syntax verifing ; research the strategy of security in database sharing and integration 歸納起來,本論文所做的工作主要有:提出基于xml的數(shù)據(jù)庫共享與集成方案;用xml統(tǒng)一描述和發(fā)布數(shù)據(jù)庫概貌信息;提出可視化語義e - r模式共享需求描述方式;提出了一種通用的sql語法驗(yàn)證模型;分析了數(shù)據(jù)庫共享與集成方案中的安全策略。
Some data shared technology such as file shared , database shared , metadata shared technology are used today . they alleviate the pressure that information can not be shared effectively to some extent . but the type of shared data is single without the ability of sharing more types of data 當(dāng)前已有的數(shù)據(jù)共享技術(shù)如文件共享技術(shù)、數(shù)據(jù)庫共享技術(shù)、元數(shù)據(jù)共享技術(shù)等,這些技術(shù)的應(yīng)用雖然在一定程度上緩解了信息無法有效共享的危機(jī),但其實(shí)現(xiàn)的共享數(shù)據(jù)類型仍比較單一,無法實(shí)現(xiàn)對多樣化數(shù)據(jù)資源的共享。
The merits and characteristic of xml - it has nothing to do with the platform , easy to expand , its interaction is good , semanteme have stronger quality , and it can be formatted - make it ease to describe the heterogeneous database and realize the inter - convert between heterogeneous databases . besides , through its own merits , it can solve the problems - the deficient of union inquires about and optimizes , the integration of heterogeneous database share based on web is not very mature , poor expanding - existing in heterogeneous database system at present partly Xml本身所具有的與平臺無關(guān)、易于擴(kuò)展、交互性好、語義性強(qiáng)、可格式化等特性和優(yōu)點(diǎn)使得它在異構(gòu)數(shù)據(jù)庫系統(tǒng)中便于異構(gòu)數(shù)據(jù)庫的描述和實(shí)現(xiàn)異構(gòu)數(shù)據(jù)庫之間的轉(zhuǎn)換,并能通過自身的優(yōu)點(diǎn),解決目前異構(gòu)數(shù)據(jù)庫系統(tǒng)中存在的聯(lián)邦查詢優(yōu)化欠缺、和對基于web的異質(zhì)數(shù)據(jù)庫間共享的集成較不成熟、擴(kuò)展性較差等問題。