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1. 发明授权

US09251194B2 Automatic data request recovery after session failure 有权
标题翻译：会话失败后自动数据请求恢复
公开(公告)号：US09251194B2
公开(公告)日：2016-02-02
申请号：US13559337
申请日：2012-07-26
申请人： Matthew Alban Neerincx , Luiz Fernando Federico Dos Santos , Oleg Ignat , David Bruce Lomet , Quetzalcoatl Bradley , Raghu Ram , Chadwin James Mumford , Peter Gvozdjak , Balendran Mugundan
发明人： Matthew Alban Neerincx , Luiz Fernando Federico Dos Santos , Oleg Ignat , David Bruce Lomet , Quetzalcoatl Bradley , Raghu Ram , Chadwin James Mumford , Peter Gvozdjak , Balendran Mugundan
IPC分类号： G06F11/00 , G06F17/30 , H04L29/14 , H04L29/08
CPC分类号： H04L67/32 , G06F11/1402 , G06F17/30348 , G06F17/30864 , G06F2201/80 , H04L67/142 , H04L69/40
摘要： Techniques for recovering from session failures between clients and database servers are described herein. A session may be established between a client and a first database server to handle a database query for the client. A command of the session may be received by the first database server from the client. Data requested by the command may be retrieved. Prior to responding to the command, the data is spooled to a session state stored in a repository of the first database server, and the session state is replicated to one or more additional database servers. The session state stored in the repository of the first database server enables the first database server and client to recover from a failure of the session. The replicated session state enables the additional database server(s) to reestablish the session and respond to the command, instead of the first database server, if the session fails.
摘要翻译：本文描述了从客户端和数据库服务器之间的会话故障中恢复的技术。可以在客户端和第一数据库服务器之间建立会话来处理客户端的数据库查询。会话的命令可以由客户端由第一数据库服务器接收。可以检索命令请求的数据。在响应命令之前，将数据假脱机到存储在第一数据库服务器的存储库中的会话状态，并将会话状态复制到一个或多个其他数据库服务器。存储在第一数据库服务器的存储库中的会话状态使得第一数据库服务器和客户端能够从会话的故障中恢复。如果会话失败，复制的会话状态使得附加数据库服务器能够重新建立会话并响应命令而不是第一个数据库服务器。

2. 发明申请

US20140032491A1 AUTOMATIC TRANSACTION RETRY AFTER SESSION FAILURE 有权
标题翻译：会话失败后的自动交易重装
公开(公告)号：US20140032491A1
公开(公告)日：2014-01-30
申请号：US13560468
申请日：2012-07-27
申请人： Matthew Alban Neerincx , Luiz Fernando Federico Dos Santos , Oleg Ignat , David Bruce Lomet , Quetzalcoatl Bradley , Raghu Ram , Chadwin James Mumford , Peter Gvozdjak , Balendran Mugundan
发明人： Matthew Alban Neerincx , Luiz Fernando Federico Dos Santos , Oleg Ignat , David Bruce Lomet , Quetzalcoatl Bradley , Raghu Ram , Chadwin James Mumford , Peter Gvozdjak , Balendran Mugundan
IPC分类号： G06F17/30 , G06F15/16
CPC分类号： G06F17/30345
摘要： Techniques for recovering from session failures between clients and database servers are described herein. A session may be established between a client and a first database server, and a transaction may be opened to process a plurality of database commands. One or more commands associated with the transaction may be received from the client at the database server. Each received command has an associated command identifier. A transaction log stores the command identifier associated with each received command and indicates whether each received command has been successfully executed at the database server. After a session failure, the session is reestablished, and a command identifier for a further command is received from the client. If the command identifier associated with the further command is determined to have been stored in the transaction log, the command does not need to be executed, and the transaction may continue.
摘要翻译：本文描述了从客户端和数据库服务器之间的会话故障中恢复的技术。可以在客户端和第一数据库服务器之间建立会话，并且可以打开事务来处理多个数据库命令。可以从数据库服务器处的客户端接收与事务相关联的一个或多个命令。每个接收到的命令都具有相关联的命令标识符。事务日志存储与每个接收到的命令相关联的命令标识符，并且指示每个接收到的命令是否已经在数据库服务器上成功执行。会话失败后，重新建立会话，并从客户端接收另一个命令的命令标识符。如果确定与其他命令相关联的命令标识符已经存储在事务日志中，则不需要执行该命令，并且事务可以继续。

3. 发明授权

US08898109B2 Automatic transaction retry after session failure 有权
标题翻译：会话失败后自动事务重试
公开(公告)号：US08898109B2
公开(公告)日：2014-11-25
申请号：US13560468
申请日：2012-07-27
申请人： Matthew Alban Neerincx , Luiz Fernando Federico Dos Santos , Oleg Ignat , David Bruce Lomet , Quetzalcoatl Bradley , Raghu Ram , Chadwin James Mumford , Peter Gvozdjak , Balendran Mugundan
发明人： Matthew Alban Neerincx , Luiz Fernando Federico Dos Santos , Oleg Ignat , David Bruce Lomet , Quetzalcoatl Bradley , Raghu Ram , Chadwin James Mumford , Peter Gvozdjak , Balendran Mugundan
IPC分类号： G06F7/00 , G06F17/00
CPC分类号： G06F17/30345
摘要： Techniques for recovering from session failures between clients and database servers are described herein. A session may be established between a client and a first database server, and a transaction may be opened to process a plurality of database commands. One or more commands associated with the transaction may be received from the client at the database server. Each received command has an associated command identifier. A transaction log stores the command identifier associated with each received command and indicates whether each received command has been successfully executed at the database server. After a session failure, the session is reestablished, and a command identifier for a further command is received from the client. If the command identifier associated with the further command is determined to have been stored in the transaction log, the command does not need to be executed, and the transaction may continue.
摘要翻译：本文描述了从客户端和数据库服务器之间的会话故障中恢复的技术。可以在客户端和第一数据库服务器之间建立会话，并且可以打开事务来处理多个数据库命令。可以从数据库服务器处的客户端接收与事务相关联的一个或多个命令。每个接收到的命令都具有相关联的命令标识符。事务日志存储与每个接收到的命令相关联的命令标识符，并且指示每个接收到的命令是否已经在数据库服务器上成功执行。会话失败后，重新建立会话，并从客户端接收另一个命令的命令标识符。如果确定与其他命令相关联的命令标识符已经存储在事务日志中，则不需要执行该命令，并且事务可以继续。

4. 发明申请

US20140032964A1 AUTOMATIC DATA REQUEST RECOVERY AFTER SESSION FAILURE 有权
标题翻译：会议失败后自动数据请求恢复
公开(公告)号：US20140032964A1
公开(公告)日：2014-01-30
申请号：US13559337
申请日：2012-07-26
申请人： Matthew Alban Neerincx , Luiz Fernando Federico Dos Santos , Oleg Ignat , David Bruce Lomet , Quetzalcoatl Bradley , Raghu Ram , Chadwin James Mumford , Peter Gvozdjak
发明人： Matthew Alban Neerincx , Luiz Fernando Federico Dos Santos , Oleg Ignat , David Bruce Lomet , Quetzalcoatl Bradley , Raghu Ram , Chadwin James Mumford , Peter Gvozdjak
IPC分类号： G06F11/14 , G06F17/30
CPC分类号： H04L67/32 , G06F11/1402 , G06F17/30348 , G06F17/30864 , G06F2201/80 , H04L67/142 , H04L69/40
摘要： Techniques for recovering from session failures between clients and database servers are described herein. A session may be established between a client and a first database server to handle a database query for the client. A command of the session may be received by the first database server from the client. Data requested by the command may be retrieved. Prior to responding to the command, the data is spooled to a session state stored in a repository of the first database server, and the session state is replicated to one or more additional database servers. The session state stored in the repository of the first database server enables the first database server and client to recover from a failure of the session. The replicated session state enables the additional database server(s) to reestablish the session and respond to the command, instead of the first database server, if the session fails.
摘要翻译：本文描述了从客户端和数据库服务器之间的会话故障中恢复的技术。可以在客户端和第一数据库服务器之间建立会话来处理客户端的数据库查询。会话的命令可以由客户端由第一数据库服务器接收。可以检索命令请求的数据。在响应命令之前，将数据假脱机到存储在第一数据库服务器的存储库中的会话状态，并将会话状态复制到一个或多个其他数据库服务器。存储在第一数据库服务器的存储库中的会话状态使得第一数据库服务器和客户端能够从会话的故障中恢复。如果会话失败，复制的会话状态使得附加数据库服务器能够重新建立会话并响应命令而不是第一个数据库服务器。

5. 发明授权

US08170997B2 Unbundled storage transaction services 有权
标题翻译：非捆绑存储交易服务
公开(公告)号：US08170997B2
公开(公告)日：2012-05-01
申请号：US12362481
申请日：2009-01-29
申请人： David Bruce Lomet , Alan David Fekete , Michael James Zwilling
发明人： David Bruce Lomet , Alan David Fekete , Michael James Zwilling
IPC分类号： G06F7/00 , G06F17/00
CPC分类号： G06F17/30362 , G06F11/1471 , G06F17/30368 , G06F2201/80
摘要： Systems (and corresponding methods) that unbundle the kernel or storage engine of a database system are provided. The unbundling separates transactional aspects from storage aspects. The two components of the storage engine resulting from the unbundling are a transaction component (TC) and a data component (DC). Data storage access methods are implemented in the DC without the added complexity of dealing with transactions, which are handled separately in the TC. The interface supported by the DC is a logical interface, e.g., record oriented, in which the way that records are mapped to disk pages (or flash memory blocks, etc.) need not be exposed. The TC then deals with logical locking and logging, meaning that it need know nothing about the way pages are used in the DC.
摘要翻译：提供了解除数据库系统的内核或存储引擎捆绑的系统（和相应的方法）。拆分将交易方面与存储方面分开。由分拆产生的存储引擎的两个组件是事务组件（TC）和数据组件（DC）。数据存储访问方法在DC中实现，而不需要在TC中单独处理的事务处理更多的复杂性。由DC支持的接口是逻辑接口，例如面向记录，其中记录被映射到磁盘页（或闪存块等）的方式不需要被暴露。 TC然后处理逻辑锁定和记录，这意味着它不需要知道在DC中使用页面的方式。

6. 发明授权

US06959401B2 Recovery guarantees for software components 失效
标题翻译：软件组件的恢复保证
公开(公告)号：US06959401B2
公开(公告)日：2005-10-25
申请号：US10154261
申请日：2002-05-23
申请人： David Bruce Lomet , Roger S. Barga
发明人： David Bruce Lomet , Roger S. Barga
IPC分类号： G06F11/00 , G06F11/14
CPC分类号： G06F11/1471 , Y10S707/99953
摘要： A technique is described for guaranteeing recovery in a computer system comprising of recovery contracts with a plurality of obligations for a message exchange between a first component and a second component. Three forms of contract are described, governing interactions between three types of components. Each contract is bilateral, i.e. between a first component and a second component. The first and second components have mutual agreement on when the contract will be released to facilitate log truncation, and independent and/or autonomous recovery. The use of persistent and transactional components and the requirements for ensuring that it is possible to replay the components in a deterministic fashion, can result in a high cost or overhead in logging of nondeterministic events, including component interactions. An appreciation that this requirement may result in overly pessimistic logging has led to the definition of three additional component types, a functional component, a subordinate component and a read-only component.
摘要翻译：描述了一种用于保证计算机系统中的恢复的技术，包括具有用于第一部件和第二部件之间的消息交换的多个义务的恢复合同。描述了三种形式的合同，管理三种组件之间的相互作用。每个合同是双边的，即在第一个组件和第二个组件之间。第一和第二部分在合同何时被释放以便于日志截断以及独立和/或自主恢复时有相互的协议。使用持久性和事务性组件以及确保有可能以确定性方式重放组件的要求可能会导致记录非确定性事件（包括组件交互）的高成本或开销。感谢这一要求可能导致过度悲观的日志记录导致三个附加组件类型，功能组件，从属组件和只读组件的定义。

7. 发明授权

US06754657B2 Time stamping of database records 有权
标题翻译：数据库记录的时间戳
公开(公告)号：US06754657B2
公开(公告)日：2004-06-22
申请号：US09939180
申请日：2001-08-24
申请人： David Bruce Lomet
发明人： David Bruce Lomet
IPC分类号： G06F1730
CPC分类号： G06F17/30353 , G06F17/30551 , Y10S707/99938 , Y10S707/99952 , Y10S707/99953
摘要： A method of assigning timestamps to data items processed by a transaction. The method sets initial upper and lower limits for a transaction timestamp that will be applied to data items processed by the transaction if the transaction does not abort. The upper and lower limits are incrementally updated as data items are processed and time intervals are requested by the transaction. The lower limit is incrementally updated as data items are processed to ensure that write-write, read-write and write-read conflicts are avoided. A transaction timestamp is selected that is greater than the lower limit, but less than the upper limit.
摘要翻译：将时间戳分配给由事务处理的数据项的方法。该方法设置事务时间戳的初始上限和下限，如果事务不中止，将会应用于事务处理的数据项。当数据项被处理并且事务请求时间间隔时，上限和下限被逐步更新。随着数据项的处理，下限将逐步更新，以确保避免写入，读写和写读冲突。选择的事务时间戳大于下限，但小于上限。

8. 发明授权

US07233947B2 Timestamping in databases 有权
标题翻译：数据库中的时间戳
公开(公告)号：US07233947B2
公开(公告)日：2007-06-19
申请号：US10444009
申请日：2003-05-22
申请人： David Bruce Lomet
发明人： David Bruce Lomet
IPC分类号： G06F17/30
CPC分类号： G06F17/30551 , G06F17/30353 , Y10S707/99938 , Y10S707/99939
摘要： A method of assigning transaction timestamps for use with a database that includes temporal data and may include non-temporal data. In the method, a lock is placed on a resource accessed by a first transaction to prevent conflicts with concurrently executing transactions. An access record of the lock mode and a timestamp of the first transaction is created for the resource accessed by the first transaction. The access record is accessed to determine whether a resource that a subsequent transaction accesses conflicts with the resource accessed by the first transaction. A timestamp lower bound or floor is identified for the subsequent transaction when the subsequent transaction accesses a resource that conflicts with the resource access of the first transaction. A timestamp is assigned to the subsequent transaction that is greater than the lower bound. The access record of a lock mode and a transaction timestamp may be created each time a resource is accessed, may be created for resources accessed after a request for CURRENT TIME is made, and/or may be made for resources accessed after an end time of a time interval defined by a request for CURRENT TIME.
摘要翻译：分配用于包括时间数据的数据库的事务时间戳的方法，并且可以包括非时间数据。在该方法中，锁被放置在由第一事务访问的资源上以防止与并发执行事务的冲突。为第一个事务访问的资源创建锁定模式的访问记录和第一个事务的时间戳。访问访问记录以确定后续事务访问的资源是否与第一个事务访问的资源冲突。当后续事务访问与第一个事务的资源访问冲突的资源时，为后续事务识别时间戳下限或下限。时间戳被分配给大于下限的后续事务。可以在每次访问资源时创建锁定模式和事务时间戳的访问记录，可以在进行CURRENT TIME的请求之后创建用于访问的资源，并且/或可以为在由CURRENT TIME的请求定义的时间间隔。

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