公开(公告)号：US20150324259A1

公开(公告)日：2015-11-12

申请号：US14272167

申请日：2014-05-07

Applicant: Oracle International Corporation

Inventor： Mehul Dilip BASTAWALA ,  Srinath KRISHNASWAMY ,  Nancy Reiko IKEDA ,  Lakshminarayanan CHIDAMBARAN

IPC: G06F11/20 ,  H04L29/08 ,  H04L29/06

CPC classification number: G06F11/20 ,  G06F11/203 ,  G06F11/2038 ,  G06F11/2046 ,  G06F2201/82 ,  G06F2201/83 ,  H04L67/1097 ,  H04L67/2814 ,  H04L67/42

Abstract: Some embodiments are directed to a method and apparatus for implementing an automatic failover mechanism for a resource. A client accesses a source through a first server using a first session. During the session, the client stores checksum information corresponding to data received via the session with the first server. When it is detected that the session between the first server and the client has failed, the client is automatically connected with second server that has access to the resource. The checksum information is transmitted from the client to the second server, where it is compared with checksum information calculated at the second server, so that a determination can be made as to whether the client can continue processing where it left off when connected to the second server.

Abstract translation: 一些实施例涉及用于实现资源的自动故障切换机制的方法和装置。 客户端通过第一个服务器使用第一个会话来访问源。 在会话期间，客户端存储与经由与第一服务器的会话接收的数据相对应的校验和信息。 当检测到第一台服务器和客户端之间的会话发生故障时，客户机将自动连接到可访问该资源的第二台服务器。 校验和信息从客户端发送到第二服务器，在第二服务器处与第二服务器计算的校验和信息进行比较，从而可以确定当连接到第二服务器时客户端是否可以继续处理 服务器。

公开(公告)号：US20180060362A1

公开(公告)日：2018-03-01

申请号：US15690894

申请日：2017-08-30

Applicant: ORACLE INTERNATIONAL CORPORATION

Inventor： Lakshminarayanan CHIDAMBARAN ,  Srividya TATA ,  Geeta ARORA ,  Rajendra S. PINGTE ,  Sneha CHANDRABABU ,  Ramkrishan KANODIA

IPC: G06F17/30

CPC classification number: G06F16/27 ,  G06F16/2219 ,  G06F16/2282

Abstract: Upon receiving a query at a local database server from a client directed to a LOB stored at a remote database server, a remote LOB locator is created comprising a local LOB locator indicating the LOB's location and a database link associated with the remote database server. The remote LOB locator is communicated to the client, which submits a request to the local database server to perform an operation directed to the LOB. The request is forwarded to the remote database server using the remote LOB locator, where the operation is performed. This mechanism is extended to work with sharded databases. Character set conversions are minimized when returning data to the client from the remote database server. Remote LOB locators may serve as bind variables for DML statements directed to local or remote tables. Local LOB locators may serve as bind variables for DML statements directed to remote tables.