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    WRITE-BEHIND OPTIMIZATION OF COVERING CACHE
    1.
    发明申请
    WRITE-BEHIND OPTIMIZATION OF COVERING CACHE 有权

    公开(公告)号：US20220414015A1

    公开(公告)日：2022-12-29

    申请号：US17359087

    申请日：2021-06-25

    Applicant: Microsoft Technology Licensing, LLC

    Inventor： Krystyna Ewa REISTETER ,  Cristian DIACONU ,  Rogério RAMOS ,  Sarika R. IYER ,  Siddharth Deepak MEHTA ,  Huanhui HU

    IPC: G06F12/0882 ,  G06F12/0871 ,  G06F12/02 ,  G06F3/06

    Abstract: Data base performance is improved using write-behind optimization of covering cache. Non-volatile memory data cache includes a full copy of stored data file(s). Data cache and storage writes, checkpoints, and recovery may be decoupled (e.g., with separate writes, checkpoints and recoveries). A covering data cache supports improved performance by supporting database operation during storage delays or outages and/or by supporting reduced I/O operations using aggregate writes of contiguous data pages (e.g., clean and dirty pages) to stored data file(s). Aggregate writes reduce data file fragmentation and reduce the cost of snapshots. Performing write-behind operations in a background process with optimistic concurrency control may support improved database performance, for example, by not interfering with write operations to data cache. Data cache may store (e.g., in metadata) data cache checkpoint information and storage checkpoint information. A stored data file may store storage checkpoint information (e.g., in a file header).

    LOG DESTAGING FROM FIXED-SIZE LOG PORTION
    2.
    发明申请
    LOG DESTAGING FROM FIXED-SIZE LOG PORTION 审中-公开

    公开(公告)号：US20200097566A1

    公开(公告)日：2020-03-26

    申请号：US16138103

    申请日：2018-09-21

    Applicant: Microsoft Technology Licensing, LLC

    Inventor： Cristian DIACONU ,  Naveen PRAKASH ,  Alejandro Hernandez SAENZ ,  Alexander BUDOVSKI

    IPC: G06F17/30 ,  G06F3/06

    Abstract: The bifurcation of a log into a fixed-size log portion and a growable log portion. Log records are first written to the fixed-size log portion. At some point, the older log records within the fixed-size log portion are destaged to the growable log portion. Destaging may involve copying the log records from the fixed-size log portion and tacking the log record onto the end of the growable log portion. This destaging might occur one sub-portion (e.g., one virtual log file) at a time. The more recent log records are within the fixed-size log portion. Accordingly, new writes to the log occur to the fixed-size log portion. Furthermore, a large portion of the reads are of the more recent log records within the fixed-size log portion. Thus, optimizing performance within the fixed-size log portion results in significant improvement in the performance of the overall log.

    STORAGE SEGMENT SERVER COVERED CACHE
    3.
    发明申请
    STORAGE SEGMENT SERVER COVERED CACHE 审中-公开

    公开(公告)号：US20200099745A1

    公开(公告)日：2020-03-26

    申请号：US16138340

    申请日：2018-09-21

    Applicant: Microsoft Technology Licensing, LLC

    Inventor： Cristian DIACONU ,  Vikram WAKADE ,  Krystyna REISTETER

    IPC: H04L29/08

    Abstract: A storage segment server environment that includes storage segment server(s) that cover a contiguous address space of data. The storage segment server has storage segments that are contiguous and that matches the address space of a respective of storage segments in the cloud store service. Thus, a read of the contiguous address spaces of the data from the cloud store service may instead be handled as a single read of the contiguous address space of the storage segment server. Each storage segment server(s) may be assigned to a range within the total contiguous address space of the data. Each storage segment server(s) includes a respective storage segment write component that is configured to perform write operations to storage segments in the respective storage segment server. Each storage segment server(s) also includes a respective cloud storage write component that initiates corresponding write operations to the cloud store service.

    BROKERING PERSISTED AND UNPERSISTED LOG RECORDS
    4.
    发明申请
    BROKERING PERSISTED AND UNPERSISTED LOG RECORDS 审中-公开

    公开(公告)号：US20200097578A1

    公开(公告)日：2020-03-26

    申请号：US16138238

    申请日：2018-09-21

    Applicant: Microsoft Technology Licensing, LLC

    Inventor： Cristian DIACONU ,  Naveen PRAKASH ,  Alexander BUDOVSKI ,  Huanhui HU ,  Alejandro Hernandez SAENZ

    IPC: G06F17/30

    Abstract: Brokering log records so as to prevent log records that are not yet persisted in a persistent log from being disseminated. The log records may be generated as a primary compute system performs operations. Upon receiving a request for a log record, the broker component determines whether the requested log record has been persisted in a persistent log. If the broker component determines that the log record has been persisted in the persistent log, the broker component responds to the request by causing the requested log record to be provided to the requesting entity (e.g., a secondary compute system). On the other hand, if the log record cannot yet determine that the log record has been persisted in the persistent log, the broker component prevents the log record from being provided to the requesting entity. This prevents data from being inconsistent during recovery.

    ACCESSING PRIOR STORAGE SEGMENT SERVER STATE
    6.
    发明申请
    ACCESSING PRIOR STORAGE SEGMENT SERVER STATE 审中-公开

    公开(公告)号：US20200097366A1

    公开(公告)日：2020-03-26

    申请号：US16138683

    申请日：2018-09-21

    Applicant: Microsoft Technology Licensing, LLC

    Inventor： Cristian DIACONU ,  Huanhui HU ,  Sheetal SHROTRI

    IPC: G06F11/14 ,  H04L29/08

    Abstract: Assembly of a state of user data as of a particular point in time in the context of the data being spread across multiple storage segment servers. Furthermore, the assembly occurs despite the storage segment servers not needing to coordinate a timing of any snapshots. Rather, the storage segment servers perform a snapshot of the portion of the data that it individually stores without having to coordinate with any other storage segment server. The particular point of time may be any arbitrary time, such as a time selected by a user.

    IN-MEMORY DATABASE SYSTEM
    7.
    发明申请
    IN-MEMORY DATABASE SYSTEM 审中-公开

    公开(公告)号：US20190205295A1

    公开(公告)日：2019-07-04

    申请号：US16298498

    申请日：2019-03-11

    Applicant: Microsoft Technology Licensing, LLC

    Inventor： Cristian DIACONU ,  Craig Steven FREEDMAN ,  Per-Ake LARSON ,  Michael James ZWILLING

    IPC: G06F16/23 ,  G06F16/2455 ,  G06F16/21 ,  G06F12/02 ,  G06F16/27

    CPC classification number: G06F16/2379 ,  G06F12/0253 ,  G06F16/219 ,  G06F16/24561 ,  G06F16/27 ,  G06F2212/1044

    Abstract: An in-memory database system stores an entirety of a database within main memory of the computer system. The database includes a table comprising a plurality of rows including a particular row. A first transaction updating the particular row is executed to create a first version of the particular row. A second transaction updating the particular row is executed to create a second version of the particular row. The first version is visible only to the first transaction, and the second version is visible only to the second transaction. The in-memory database system may associate an index with the database table, the index referencing the plurality of rows, including referencing the first version of the particular row and the second version of the particular row. The in-memory database system may initiate garbage collection of the first version of the particular row and/or the second version of the particular row.

    DISTRIBUTED TRANSACTION MANAGEMENT
    8.
    发明申请
    DISTRIBUTED TRANSACTION MANAGEMENT 审中-公开
    分销交易管理

    公开(公告)号：US20150254273A1

    公开(公告)日：2015-09-10

    申请号：US14712755

    申请日：2015-05-14

    Applicant: Microsoft Technology Licensing, LLC

    Inventor： Per-Ake LARSON ,  Michael James ZWILLING ,  Cristian DIACONU

    IPC: G06F17/30

    CPC classification number: G06F17/30227 ,  G06F17/30353 ,  G06F17/30371 ,  G06F17/30575 ,  G06F17/30581 ,  G06F17/30864

    Abstract: The subject disclosure relates to a distributed transaction management technique that ensures synchronization between participating nodes in a global or distributed transaction. The technique leverages a commit protocol that uses local clocks at the respective participating nodes. Participants in a global transaction are configured to utilize the same commit timestamp and logical read time and can advance their respective local clocks to establish this synchronization. In one embodiment, distributed commit utilizes a modified version of two-phase commit that includes an extra phase to collect commit timestamp votes from participants. Additionally, a heartbeat mechanism can be used to establish loose synchronization between nodes. In another embodiment, a node can respond to a remote transaction request by returning a list of nodes involved in generating the result of the transaction and the types of access used by such nodes in addition to the transaction result itself.

    Abstract translation: 本公开涉及分布式事务管理技术，其确保全局或分布式事务中的参与节点之间的同步。 该技术利用在相应参与节点处使用本地时钟的提交协议。 全局事务中的参与者被配置为利用相同的提交时间戳和逻辑读取时间，并且可以推进其各自的本地时钟以建立该同步。 在一个实施例中，分布式提交利用两阶段提交的修改版本，其包括从参与者收集提交时间戳投票的额外阶段。 另外，可以使用心跳机制来建立节点之间的松散同步。 在另一个实施例中，节点可以通过返回生成事务结果所涉及的节点列表以及除了事务结果本身之外由这些节点使用的访问类型来响应远程事务请求。

    WRITE-BEHIND OPTIMIZATION OF COVERING CACHE
    10.
    发明公开
    WRITE-BEHIND OPTIMIZATION OF COVERING CACHE 审中-公开

    公开(公告)号：US20230297510A1

    公开(公告)日：2023-09-21

    申请号：US18311699

    申请日：2023-05-03

    Applicant: Microsoft Technology Licensing, LLC

    Inventor： Krystyna Ewa REISTETER ,  Cristian DIACONU ,  Rogério RAMOS ,  Sarika R. IYER ,  Siddharth Deepak MEHTA ,  Huanhui HU

    IPC: G06F12/0882 ,  G06F3/06 ,  G06F12/02 ,  G06F12/0871

    CPC classification number: G06F12/0882 ,  G06F3/0604 ,  G06F3/0656 ,  G06F3/0679 ,  G06F12/0246 ,  G06F12/0871

    Abstract: Data base performance is improved using write-behind optimization of covering cache. Non-volatile memory data cache includes a full copy of stored data file(s). Data cache and storage writes, checkpoints, and recovery may be decoupled (e.g., with separate writes, checkpoints and recoveries). A covering data cache supports improved performance by supporting database operation during storage delays or outages and/or by supporting reduced I/O operations using aggregate writes of contiguous data pages (e.g., clean and dirty pages) to stored data file(s). Aggregate writes reduce data file fragmentation and reduce the cost of snapshots. Performing write-behind operations in a background process with optimistic concurrency control may support improved database performance, for example, by not interfering with write operations to data cache. Data cache may store (e.g., in metadata) data cache checkpoint information and storage checkpoint information. A stored data file may store storage checkpoint information (e.g., in a file header).

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