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1. 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。

2. 发明授权

US07783852B2 Techniques for automated allocation of memory among a plurality of pools 有权
标题翻译：在多个池中自动分配存储器的技术
公开(公告)号：US07783852B2
公开(公告)日：2010-08-24
申请号：US10746471
申请日：2003-12-23
申请人： Tirthankar Lahiri , Poojan Kumar , Brian Hirano , Arvind Nithrakashyap , Kant Patel , Kiran Goyal , Juan R. Loaiza
发明人： Tirthankar Lahiri , Poojan Kumar , Brian Hirano , Arvind Nithrakashyap , Kant Patel , Kiran Goyal , Juan R. Loaiza
IPC分类号： G06F12/00
CPC分类号： G06F9/5016 , G06F12/023
摘要： Allocation of memory is optimized across multiple pools of memory, based on minimizing the time it takes to successfully retrieve a given data item from each of the multiple pools. First data is generated that indicates a hit rate per pool size for each of multiple memory pools. In an embodiment, the generating step includes continuously monitoring attempts to access, or retrieve a data item from, each of the memory pools. The first data is converted to second data that accounts for a cost of a miss with respect to each of the memory pools. In an embodiment, the second data accounts for the cost of a miss in terms of time. How much of the memory to allocate to each of the memory pools is determined, based on the second data. In an embodiment, the steps of converting and determining are automatically performed, on a periodic basis.
摘要翻译：基于最小化从多个池中的每一个成功检索给定数据项所需的时间，内存分配在多个内存池之间进行了优化。生成第一个数据，指示每个多个内存池的每个池大小的命中率。在一个实施例中，生成步骤包括连续地监视从每个存储器池访问或检索数据项的尝试。第一个数据被转换成相对于每个存储器池来计算缺失成本的第二数据。在一个实施例中，第二数据考虑到时间方面的错过的成本。基于第二数据确定分配给每个存储器池的存储器的多少。在一个实施例中，周期性地自动执行转换和确定的步骤。

3. 发明授权

US07031987B2 Integrating tablespaces with different block sizes 有权
公开(公告)号：US07031987B2
公开(公告)日：2006-04-18
申请号：US09871476
申请日：2001-05-30
申请人： Sreedhar Mukkamalla , Arvind Nithrakashyap , Tirthankar Lahiri , Alok Pareek , Juan R. Loaiza , J. William Lee , Gary C. Ngai
发明人： Sreedhar Mukkamalla , Arvind Nithrakashyap , Tirthankar Lahiri , Alok Pareek , Juan R. Loaiza , J. William Lee , Gary C. Ngai
IPC分类号： G06F7/00
CPC分类号： G06F17/30592 , G06F17/30 , G06F17/30952 , Y10S707/99938 , Y10S707/99942 , Y10S707/99955
摘要： Provided herein is a mechanism that allows a given database system to access data blocks from another database system, where data blocks from the given database system and data blocks from the other database system have different sizes. According to an aspect of the present invention, a tablespace in the other database system contained the data blocks. The tablespace is detached from the other database system and integrated into the given database, which is capable of processing data stored in data blocks of a different sizes.

4. 发明申请

US20060143187A1 Integrating tablespaces with different block sizes 审中-公开
标题翻译：集成具有不同块大小的表空间
公开(公告)号：US20060143187A1
公开(公告)日：2006-06-29
申请号：US11347644
申请日：2006-02-02
申请人： Sreedhar Mukkamalla , Arvind Nithrakashyap , Tirthankar Lahiri , Alok Pareek , Juan Loaiza , J. Lee , Gary Ngai
发明人： Sreedhar Mukkamalla , Arvind Nithrakashyap , Tirthankar Lahiri , Alok Pareek , Juan Loaiza , J. Lee , Gary Ngai
IPC分类号： G06F17/30
CPC分类号： G06F16/283 , G06F16/00 , G06F16/9017 , Y10S707/99938 , Y10S707/99942 , Y10S707/99955
摘要： Provided herein is a mechanism that allows a given database system to access data blocks from another database system, where data blocks from the given database system and data blocks from the other database system have different sizes. According to an aspect of the present invention, a tablespace in the other database system contained the data blocks. The tablespace is detached from the other database system and integrated into the given database, which is capable of processing data stored in data blocks of different sizes.
摘要翻译：这里提供了允许给定数据库系统从另一个数据库系统访问数据块的机制，其中来自给定数据库系统的数据块和来自其他数据库系统的数据块具有不同的大小。根据本发明的一个方面，其他数据库系统中的表空间包含数据块。表空间与其他数据库系统分离，并集成到给定的数据库中，该数据库能够处理存储在不同大小的数据块中的数据。

5. 发明授权

US09697253B2 Consistent client-side cache 有权
公开(公告)号：US09697253B2
公开(公告)日：2017-07-04
申请号：US11875782
申请日：2007-10-19
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： G06F17/30
CPC分类号： G06F17/3048
摘要： A method, system, and computer program product is disclosed for caching results in a client-side cache. Embodiments of a method, a system, and a computer program product are disclosed that associate a first snapshot of a database with a client that indicates a state of the database after a last database request by the client, and indicate any number of invalid cached results in the client cache for the client based upon the first snapshot. In some embodiments, the method further includes receiving a second snapshot that indicates a state of the database upon receipt of a database server request by the client, and updating the first snapshot with the second snapshot.

6. 发明授权

US08892905B2 Method and apparatus for performing selective encryption/decryption in a data storage system 有权
标题翻译：用于在数据存储系统中执行选择性加密/解密的方法和装置
公开(公告)号：US08892905B2
公开(公告)日：2014-11-18
申请号：US11726428
申请日：2007-03-21
申请人： Adam Y. Lee , Varun Malhotra , Daniel ManHung Wong , Tirthankar Lahiri , Kiran Goyal , Juan R. Loaiza , Paul Youn
发明人： Adam Y. Lee , Varun Malhotra , Daniel ManHung Wong , Tirthankar Lahiri , Kiran Goyal , Juan R. Loaiza , Paul Youn
IPC分类号： G06Q30/02 , H04L9/08
CPC分类号： H04L9/0894
摘要： One embodiment of the present invention provides a system for performing selective encryption/decryption in a data storage system. During operation, the system receives a data block from a storage medium at an input/output layer, wherein the input/output layer serves as an interface between the storage medium and a buffer cache. Next, the system determines whether the data block is an encrypted data block. If not, the system stores the data block in the buffer cache. Otherwise, if the data block is an encrypted data block, the system retrieves a storage-key, wherein the storage-key is associated with a subset of storage, which is associated with the encrypted data block. Using the storage-key, the system then decrypts the encrypted data block to produce a decrypted data block. Finally, the system stores the decrypted data block in the buffer cache, wherein the data block remains encrypted in the storage medium.
摘要翻译：本发明的一个实施例提供一种用于在数据存储系统中执行选择性加密/解密的系统。在操作期间，系统在输入/输出层从存储介质接收数据块，其中输入/输出层用作存储介质和缓冲器高速缓存之间的接口。接下来，系统确定数据块是否是加密数据块。如果没有，系统将数据块存储在缓冲区高速缓存中。否则，如果数据块是加密数据块，则系统检索存储密钥，其中存储密钥与与加密数据块相关联的存储子集相关联。使用存储密钥，系统然后解密加密的数据块以产生解密的数据块。最后，系统将解密的数据块存储在缓冲器高速缓存中，其中数据块在存储介质中保持加密。

7. 发明申请

US20080232592A1 Method and apparatus for performing selective encryption/decryption in a data storage system 有权
标题翻译：用于在数据存储系统中执行选择性加密/解密的方法和装置
公开(公告)号：US20080232592A1
公开(公告)日：2008-09-25
申请号：US11726428
申请日：2007-03-21
申请人： Adam Y. Lee , Varun Malhotra , Daniel ManHung Wong , Tirthankar Lahiri , Kiran Goyal , Juan R. Loaiza , Paul Youn
发明人： Adam Y. Lee , Varun Malhotra , Daniel ManHung Wong , Tirthankar Lahiri , Kiran Goyal , Juan R. Loaiza , Paul Youn
IPC分类号： H04L9/00
CPC分类号： H04L9/0894
摘要： One embodiment of the present invention provides a system for performing selective encryption/decryption in a data storage system. During operation, the system receives a data block from a storage medium at an input/output layer, wherein the input/output layer serves as an interface between the storage medium and a buffer cache. Next, the system determines whether the data block is an encrypted data block. If not, the system stores the data block in the buffer cache. Otherwise, if the data block is an encrypted data block, the system retrieves a storage-key, wherein the storage-key is associated with a subset of storage, which is associated with the encrypted data block. Using the storage-key, the system then decrypts the encrypted data block to produce a decrypted data block. Finally, the system stores the decrypted data block in the buffer cache, wherein the data block remains encrypted in the storage medium.
摘要翻译：本发明的一个实施例提供一种用于在数据存储系统中执行选择性加密/解密的系统。在操作期间，系统在输入/输出层从存储介质接收数据块，其中输入/输出层用作存储介质和缓冲器高速缓存之间的接口。接下来，系统确定数据块是否是加密数据块。如果没有，系统将数据块存储在缓冲区高速缓存中。否则，如果数据块是加密数据块，则系统检索存储密钥，其中存储密钥与与加密数据块相关联的存储子集相关联。使用存储密钥，系统然后解密加密的数据块以产生解密的数据块。最后，系统将解密的数据块存储在缓冲器高速缓存中，其中数据块在存储介质中保持加密。

8. 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.

9. 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。

10. 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。

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