eXtremeDB內(nèi)核模式（KM）

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　　操作系統(tǒng)的核心部分是內(nèi)核，內(nèi)核負責完成系統(tǒng)資源分配、調度、底層硬件接口、網(wǎng)絡、安全以及其他必要任務。
　　為提高系統(tǒng)整體性能，一些像內(nèi)核模式軟件組件的應用程序被整體或部分加入到系統(tǒng)內(nèi)核中。通常這些基于內(nèi)核的軟件必須對復雜的數(shù)據(jù)進行排序、存儲和檢索，例如：一個訪問控制系統(tǒng)的“策略引擎”可以駐留在內(nèi)核并要求檢查一個規(guī)則數(shù)據(jù)庫來決定一個進程是否有權限在某一種模式和某一個時刻打開指定的文件。
　　第一個內(nèi)核模式數(shù)據(jù)庫系統(tǒng)
　　eXtremeDB內(nèi)核版（kernel mode，KM）是第一個明確的為在操作系統(tǒng)內(nèi)核運行而設計的數(shù)據(jù)庫管理系統(tǒng)（DBMS），它提供基于內(nèi)核的應用功能與關鍵數(shù)據(jù)庫功能，例如：事務處理、使用多種索引類型的查詢、多線程數(shù)據(jù)訪問、靈活的數(shù)據(jù)庫API以及高層次數(shù)據(jù)定義語言。
　　McObject在內(nèi)存嵌入式數(shù)據(jù)庫領域處于領先地位，這主要得益于其超小尺寸的eXtremeDB產(chǎn)品。eXtremeDB的高效性以及其優(yōu)化的全內(nèi)存的體系架構，允許其部署在內(nèi)核，而其他數(shù)據(jù)庫管理系統(tǒng)（DBMS）則會耗盡內(nèi)核資源。
　　在典型應用中，與在用戶空間部署一個數(shù)據(jù)庫系統(tǒng)并通過昂貴的（在性能方面）上下文切換來調用內(nèi)核進程對其進行訪問相比，eXtremeDB-KM在速度上快了一個數(shù)量級。
　　直接訪問內(nèi)核數(shù)據(jù)
　　eXtremeDB-KM是一個內(nèi)存數(shù)據(jù)庫系統(tǒng)，提供對內(nèi)核進程的直接數(shù)據(jù)訪問。eXtremeDB運行時將數(shù)據(jù)庫映射到驅動程序或內(nèi)核模塊地址空間，并提供指向數(shù)據(jù)元素的指針，從而節(jié)省了管理緩存的開銷。
　　eXtremeDB-KM運行代碼直接鏈接到模塊，因此執(zhí)行路徑中不會出現(xiàn)遠程程序調用，這使得執(zhí)行路徑通常只需要幾個CPU指令。內(nèi)核模式線程直接訪問內(nèi)核數(shù)據(jù)庫；并發(fā)訪問由數(shù)據(jù)庫在運行時進行協(xié)調。通過由系統(tǒng)調用實現(xiàn)的一組公共接口，用戶模式應用程序同樣可以使用數(shù)據(jù)庫（如下圖所示）。

　　eXtremeDB-KM可以直接供內(nèi)核進程使用。與eXtremeDB-KM進行交互的用戶模式應用程序則需要使用一組公共接口，這些接口通過對內(nèi)核模式代理的系統(tǒng)調用實現(xiàn)。
　　eXtremeDB-KM
　　McObject公司的eXtremeDB-KM包提供特定的開發(fā)工具、完整源代碼及示例程序。內(nèi)核模塊使用eXtremeDB-KM的一個例子是檢查給定操作是否違背存儲在數(shù)據(jù)庫中的訪問規(guī)則。相關的用戶模式示例程序給出了定義及更改訪問規(guī)則的接口，其中規(guī)則存儲在內(nèi)核模式數(shù)據(jù)庫中。

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