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21. 发明授权

US10296629B2 Server supporting a consistent client-side cache 有权
公开(公告)号：US10296629B2
公开(公告)日：2019-05-21
申请号：US11876679
申请日：2007-10-22
申请人： Lakshminarayanan Chidambaran , Mehul Dilip Bastawala , Srinath Krishnaswamy , Tirthankar Lahiri , Juan R. Loaiza , Bipul Sinha , Srinivas S. Vemuri
发明人： Lakshminarayanan Chidambaran , Mehul Dilip Bastawala , Srinath Krishnaswamy , Tirthankar Lahiri , Juan R. Loaiza , Bipul Sinha , Srinivas S. Vemuri
IPC分类号： G06F7/00 , G06F17/30 , G06F17/00
摘要： A method, system, and computer program product is disclosed for interacting with a client supported by a client-side cache. Embodiments of a method, a system, and a computer program product are disclosed that retrieve a first snapshot, indicating a state of the database after a last database request by the client, associated with the client, determine any number of invalid cached results for the client based on the first snapshot, and transmit the any number of invalid cached results and a second snapshot, an update for the first snapshot.

22. 发明授权

US08738568B2 User-defined parallelization in transactional replication of in-memory database 有权
标题翻译：内存数据库的事务复制中用户定义的并行化
公开(公告)号：US08738568B2
公开(公告)日：2014-05-27
申请号：US13101783
申请日：2011-05-05
申请人： Sourav Ghosh , Rohan Aranha , Tirthankar Lahiri , Mark McAuliffe , Chih-Ping Wang , Paul Tuck , Nagender Bandi , John E. Miller , Dina Thomas , Marie-Anne Neimat
发明人： Sourav Ghosh , Rohan Aranha , Tirthankar Lahiri , Mark McAuliffe , Chih-Ping Wang , Paul Tuck , Nagender Bandi , John E. Miller , Dina Thomas , Marie-Anne Neimat
IPC分类号： G06F7/00
CPC分类号： G06F11/2038 , G06F11/2097 , G06F17/30575 , G06F17/30581 , G06F2201/80
摘要： A replication track is a designated group of transactions that are to be replicated at a destination database in a way that, with respect to any other transaction in the replication track, preserves transactional dependency. Further, transactions in a replication track can be replicated at the destination database without regard to transactional dependency of other transactions in another track. This facilitates concurrent parallel replication of transactions of different tracks. Replicating data in this manner is referred to herein as track replication. An application may request execution of transactions and designate different tracks for transactions.
摘要翻译：复制轨迹是要在目标数据库中复制的指定的一组事务，其方式是相对于复制轨道中的任何其他事务来保留事务依赖关系。此外，可以在目标数据库中复制复制轨道中的事务，而不考虑另一轨道中其他事务的事务依赖关系。这有助于同时并行复制不同轨道的事务。以这种方式复制数据在本文称为轨道复制。应用程序可以请求执行事务并为事务指定不同的轨道。

23. 发明授权

US08429133B2 Partial key indexes 有权
标题翻译：部分关键指标
公开(公告)号：US08429133B2
公开(公告)日：2013-04-23
申请号：US11956287
申请日：2007-12-13
申请人： Tirthankar Lahiri , Dheeraj Pandey , Juan R. Loaiza , Michael Zoll , Kiran B. Goyal , Neil J. S. Macnaughton
发明人： Tirthankar Lahiri , Dheeraj Pandey , Juan R. Loaiza , Michael Zoll , Kiran B. Goyal , Neil J. S. Macnaughton
IPC分类号： G06F7/00 , G06F17/00 , G06F17/30
CPC分类号： G06F17/30327
摘要： A partial reverse key index is described, which allows distributed contention as resources vie to insert data into an index as well as allows range scans to be performed on the index. To do so, before an index entry for a key value is inserted into an index, the key value is transformed using a transformation operation that affects a subset of the order of the key value. The index entry is then inserted based on the transformed key value. Because the transformation operation affects the order of the key value, the transformed values associated with two consecutive key values will not necessarily be consecutive. Therefore, the index entries associated with the consecutive key values may be inserted into unrelated portions of the index.
摘要翻译：描述了部分反向密钥索引，其允许分布式争用作为将数据插入到索引中的资源，并且允许在索引上执行范围扫描。为此，在将键值的索引条目插入索引之前，将使用影响键值顺序子集的转换操作来转换键值。然后基于转换的键值插入索引条目。由于转换操作影响键值的顺序，与两个连续的键值相关联的变换值不一定是连续的。因此，可以将与连续键值相关联的索引条目插入索引的无关部分。

24. 发明授权

US08306951B2 Automated integrated high availability of the in-memory database cache and the backend enterprise database 有权
标题翻译：自动集成高可用性的内存数据库缓存和后端企业数据库
公开(公告)号：US08306951B2
公开(公告)日：2012-11-06
申请号：US12719264
申请日：2010-03-08
申请人： Sourav Ghosh , Ashish Motivala , Charles Hoch , Rohan Aranha , Ben Fulton , Andrey Gusev , Tirthankar Lahiri , Juan Tellez
发明人： Sourav Ghosh , Ashish Motivala , Charles Hoch , Rohan Aranha , Ben Fulton , Andrey Gusev , Tirthankar Lahiri , Juan Tellez
IPC分类号： G06F17/30
CPC分类号： G06F17/30575 , G06F11/2025 , G06F11/2028 , G06F11/2038 , G06F11/2097 , G06F2201/80
摘要： A cluster manager is configured to manage a plurality of copies of a mid-tier database as a mid-tier database cluster. The cluster manager may concurrently manage a backend database system. The cluster manager is configured to monitor for and react to failures of mid-tier database nodes. The cluster manager may react to a mid-tier database failure by, for example, assigning a new active node, creating a new standby node, creating new copies of the mid-tier databases, implementing new replication or backup schemes, reassigning the node's virtual address to another node, or relocating applications that were directly linked to the mid-tier database to another host. Each node or an associated agent may configure the cluster manager to behave in this fashion during initialization, based on common cluster configuration information. Each copy of the mid-tier database may be, for example, a memory resident database. Thus, a node must reload the entire database into memory to recover a copy of the database.
摘要翻译：集群管理器被配置为将中间层数据库的多个副本作为中间层数据库集群进行管理。集群管理器可以同时管理后端数据库系统。集群管理器配置为监视中层数据库节点的故障并对其做出反应。集群管理器可以通过例如分配新的活动节点，创建新的备用节点，创建中间层数据库的新副本，实现新的复制或备份方案来对中间层数据库故障作出反应，重新分配节点的虚拟地址到另一个节点，或将直接链接到中间层数据库的应用程序重新定位到另一个主机。基于常见的集群配置信息，每个节点或相关联的代理可以在初始化期间将集群管理器配置为以这种方式行事。中间层数据库的每个副本可以是例如内存驻留数据库。因此，节点必须将整个数据库重新加载到内存中以恢复数据库的副本。

25. 发明申请

US20110071981A1 AUTOMATED INTEGRATED HIGH AVAILABILITY OF THE IN-MEMORY DATABASE CACHE AND THE BACKEND ENTERPRISE DATABASE 有权
标题翻译：内存数据库高速缓存和后端企业数据库的自动化高可用性
公开(公告)号：US20110071981A1
公开(公告)日：2011-03-24
申请号：US12719264
申请日：2010-03-08
申请人： Sourav Ghosh , Ashish Motivala , Charles Hoch , Rohan Aranha , Ben Fulton , Andrey Gusev , Tirthankar Lahiri , Juan Tellez
发明人： Sourav Ghosh , Ashish Motivala , Charles Hoch , Rohan Aranha , Ben Fulton , Andrey Gusev , Tirthankar Lahiri , Juan Tellez
IPC分类号： G06F17/30
CPC分类号： G06F17/30575 , G06F11/2025 , G06F11/2028 , G06F11/2038 , G06F11/2097 , G06F2201/80
摘要： A cluster manager is configured to manage a plurality of copies of a mid-tier database as a mid-tier database cluster. The cluster manager may concurrently manage a backend database system. The cluster manager is configured to monitor for and react to failures of mid-tier database nodes. The cluster manager may react to a mid-tier database failure by, for example, assigning a new active node, creating a new standby node, creating new copies of the mid-tier databases, implementing new replication or backup schemes, reassigning the node's virtual address to another node, or relocating applications that were directly linked to the mid-tier database to another host. Each node or an associated agent may configure the cluster manager to behave in this fashion during initialization, based on common cluster configuration information. Each copy of the mid-tier database may be, for example, a memory resident database. Thus, a node must reload the entire database into memory to recover a copy of the database.
摘要翻译：集群管理器被配置为将中间层数据库的多个副本作为中间层数据库集群进行管理。集群管理器可以同时管理后端数据库系统。集群管理器配置为监视中层数据库节点的故障并对其做出反应。集群管理器可以通过例如分配新的活动节点，创建新的备用节点，创建中间层数据库的新副本，实现新的复制或备份方案来对中间层数据库故障作出反应，重新分配节点的虚拟地址到另一个节点，或将直接链接到中间层数据库的应用程序重新定位到另一个主机。基于常见的集群配置信息，每个节点或相关联的代理可以在初始化期间将集群管理器配置为以这种方式行事。中间层数据库的每个副本可以是例如内存驻留数据库。因此，节点必须将整个数据库重新加载到内存中以恢复数据库的副本。

26. 发明申请

US20100036843A1 GLOBAL CHECKPOINT SCN 有权
标题翻译：全球检验点
公开(公告)号：US20100036843A1
公开(公告)日：2010-02-11
申请号：US12244640
申请日：2008-10-02
申请人： Neil MacNaughton , Tirthankar Lahiri , Varun Malhotra
发明人： Neil MacNaughton , Tirthankar Lahiri , Varun Malhotra
IPC分类号： G06F17/30
CPC分类号： G06F17/30362 , Y10S707/99933 , Y10S707/99935
摘要： Described herein are techniques for generating a global checkpoint system change number and computing a snapshot query using the global checkpoint system change number without a need to acquire global locks. In many cases, the need to acquire global locks is eliminated, thereby saving the overhead attendant to processing global locks.
摘要翻译：这里描述了用于生成全局检查点系统改变号码并使用全局检查点系统改变号码计算快照查询而不需要获取全局锁的技术。在许多情况下，消除了获取全局锁的需求，从而节省了处理全局锁的开销。

27. 发明申请

US20080071997A1 Techniques for improved read-write concurrency 有权
标题翻译：改进的读写并发技术
公开(公告)号：US20080071997A1
公开(公告)日：2008-03-20
申请号：US11521908
申请日：2006-09-15
申请人： Juan Loaiza , Neil MacNaughton , Eugene Ho , Vipin Gokhale , Kiran Goyal , Tirthankar Lahiri
发明人： Juan Loaiza , Neil MacNaughton , Eugene Ho , Vipin Gokhale , Kiran Goyal , Tirthankar Lahiri
IPC分类号： G06F13/00 , G06F12/14
CPC分类号： G06F9/526 , G06F17/30362 , G06F2209/523
摘要： Techniques are provided for performing changes to a resource governed by a locking mechanism. An entity (such as a server instance in a database system cluster) requests permission to modify the resource. In response to the request, the entity receives a first lock on the resource, which grants permission to perform the change to the resource without making the change permanent. After receiving the first lock, the entity performs the change to a copy of the resource that resides in shared memory without making another copy of the resource. After performing the change and until receiving permission to make the change permanent, the entity prevents the change to the resource from becoming permanent. After performing the change, the entity receives a second lock on the resource, which grants the entity permission to make the change permanent. After receiving the second lock, the entity ceases to prevent the change to the resource from becoming permanent.
摘要翻译：提供了用于对由锁定机构管理的资源进行更改的技术。实体（如数据库系统集群中的服务器实例）请求修改资源的权限。响应于该请求，实体在资源上接收到第一个锁定，该权限允许对资源执行更改，而不会使更改永久性。在接收到第一个锁定之后，实体对驻留在共享内存中的资源的副本执行更改，而不创建资源的另一个副本。执行变更后，直到获得变更永久性的许可，实体将防止资源变为永久性。执行更改后，实体将在资源上收到第二个锁定，该实体授予实体永久性更改权限。收到第二个锁后，实体停止防止资源变为永久性。

28. 发明授权

US07194589B2 Reducing disk IO by full-cache write-merging 有权
标题翻译：通过全缓存写入合并来减少磁盘IO
公开(公告)号：US07194589B2
公开(公告)日：2007-03-20
申请号：US10645987
申请日：2003-08-22
申请人： Tirthankar Lahiri , Juan R. Loaiza , Richard L. Frank , Kiran Goyal
发明人： Tirthankar Lahiri , Juan R. Loaiza , Richard L. Frank , Kiran Goyal
IPC分类号： G06F13/00
CPC分类号： G06F12/0804 , G06F12/0866
摘要： An electronic and computerized system that coalesces write operations using a buffer cache which stores data waiting to be written back to a disk of the electronic and computerized system is described. Dirty data blocks with consecutive data block addresses in the buffer cache are coalesced and written to the disk together. The disk head movements for performing the disk IOs are significantly reduced, thereby allowing the electronic and computerized system to maintain a high IO throughput and high peak performance with fewer disks.
摘要翻译：描述了使用存储等待被写回到电子和计算机化系统的盘的数据的缓冲器高速缓存来合并写入操作的电子和计算机化系统。缓冲区高速缓存中具有连续数据块地址的脏数据块被合并并且一起写入磁盘。用于执行磁盘IO的盘头运动显着减少，从而允许电子和计算机系统以更少的磁盘保持高IO吞吐量和高峰值性能。

29. 发明授权

US06952664B1 System and method for predicting cache performance 有权
标题翻译：用于预测缓存性能的系统和方法
公开(公告)号：US06952664B1
公开(公告)日：2005-10-04
申请号：US09834342
申请日：2001-04-13
申请人： Tirthankar Lahiri , Juan R. Loaiza , Arvind Nithrakashyap , William H. Bridge
发明人： Tirthankar Lahiri , Juan R. Loaiza , Arvind Nithrakashyap , William H. Bridge
IPC分类号： G06F17/50 , G06G17/50
CPC分类号： G06F17/5022
摘要： A system and methods for simulating the performance (e.g., miss rate) of one or more caches. A cache simulator comprises a segmented list of buffers, with each buffer configured to store a data identifier and an identifier of the buffer's segment. Data references, which may be copied from an operational cache, are applied to the list to conduct the simulation. Initial estimates of each cache's miss rate include the number of references that missed all segments of the list plus the hits in all segments not part of the cache. A correction factor is generated from the ratio of actual misses incurred by the operational cache to the estimated misses for a simulated cache of the same size as the operational cache. Final predictions are generated by multiplying the initial estimates by the correction factor. The size of the operational cache may be dynamically adjusted based on the final predictions.
摘要翻译：用于模拟一个或多个高速缓存的性能（例如，错过率）的系统和方法。缓存模拟器包括分段缓冲器列表，其中每个缓冲器被配置为存储数据标识符和缓冲器段的标识符。可以从操作缓存复制的数据引用被应用于列表以进行模拟。每个缓存的未命中率的初始估计包括丢失列表的所有段的引用数量加上不是高速缓存的一部分的所有段中的命中。由操作缓存引起的实际未命中率与与操作缓存大小相同的模拟高速缓存的估计未命中的比率产生校正因子。最终预测是通过将初始估计乘以校正因子而产生的。可以基于最终预测来动态地调整操作高速缓存的大小。

30. 发明申请

US20050044311A1 Reducing disk IO by full-cache write-merging 有权
标题翻译：通过全缓存写入合并来减少磁盘IO
公开(公告)号：US20050044311A1
公开(公告)日：2005-02-24
申请号：US10645987
申请日：2003-08-22
申请人： Tirthankar Lahiri , Juan Loaiza , Richard Frank , Kiran Goyal
发明人： Tirthankar Lahiri , Juan Loaiza , Richard Frank , Kiran Goyal
IPC分类号： G06F12/08 , G06F12/00
CPC分类号： G06F12/0804 , G06F12/0866
摘要： A method and system for implementing coalescing write IOs for an electronic and computerized system is disclosed. The electronic and computerized system has a buffer cache storing data blocks waiting for being written into a disk of the electronic and computerized system. Dirty data blocks with consecutive data block addresses in the buffer cache are coalesced and written to the disk together. Thus, the disk head movements for performing the write IOs are significantly reduced, thereby allowing the electronic and computerized system to maintain a high IO throughput and high peak performance with fewer disks.
摘要翻译：公开了一种用于实现电子和计算机化系统的合并写入IO的方法和系统。电子计算机系统具有缓冲存储器，其存储等待被写入电子计算机系统的盘的数据块。缓冲区高速缓存中具有连续数据块地址的脏数据块被合并并且一起写入磁盘。因此，用于执行写入IO的盘头移动被显着地减少，从而允许电子和计算机系统通过更少的盘来维持高IO吞吐量和高峰值性能。

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