US6490610B1 — Automatic failover for clients accessing a resour…

Claim 1

Independent Claim 79 words

A method for recovering after failure of a first connection that was established between a client and a first server for accessing a resource, the method comprising the steps of: detecting that the first connection between said first server and said client has failed; after detecting the first connection has failed, selecting a second server that has access to said resource; and automatically connecting said client with said second server to establish a second connection for accessing said resource.

Claim 2

Independent Claim 79 words

A method for recovering after failure of a first connection that was established between a client and a first server for accessing a resource, the method comprising the steps of: detecting that the first connection between said first server and said client has failed; after detecting the first connection has failed, selecting a second server that has access to said resource; and automatically connecting said client with said second server to establish a second connection for accessing said resource.

Claim 3

Dependent Claim 86 words

The method of claim 1 wherein: said step of detecting that the first connection between said first server and said client has failed includes the step of detecting that the first connection between a database server application that has access to the resource and a database client application has failed; said step of automatically connecting said client with the second server includes the step of automatically connecting said database client application with a second database server application to establish a second connection for accessing said resource.

Claim 4

Dependent Claim 44 words

The method of claim 2 wherein the step of detecting that said first connection between said database client application and said first server has failed includes the step of detecting that the database server application has not responded within a threshold period of time.

Claim 5

Dependent Claim 66 words

The method of claim 1 wherein the step of detecting that the first connection between said first server and said client has failed includes the steps of: detecting that said first connection between a database client application and said first server has failed; and notifying said application that said first connection has failed and that access to said resource through said first server has been lost.

Claim 6

Dependent Claim 67 words

The method of claim 4 wherein the step of detecting that said first connection between said database client application and said first server has failed includes the steps of: said client initiating a callback request when making said first connection between said client and said first server, and said client responding to said callback request when said first connection between said client and said first server fails.

Claim 7

Dependent Claim 23 words

The method of claim 1 further comprising the step of said client causing said resource to be rolled back to a valid state.

Claim 8

Dependent Claim 49 words

The method of claim 1 wherein: said first server is executing a select command when said first connection fails; and the method further comprises the step of said client causing said second server to complete execution of said select command after said client is connected to said second server.

Claim 9

Dependent Claim 43 words

The method of claim 1 wherein: said client is causing said first server to execute a transaction when said first connection fails; and said client causes said second server to complete execution of said transaction after said client connects to said second server.

Claim 10

Dependent Claim 56 words

The method of claim 1 wherein: the first connection between the first server and the client constitutes a session; the method includes the steps of maintaining values that reflect a state of said session at both said client and said first server, and communicating said values to said second server after failure of said first connection.

Claim 11

Dependent Claim 48 words

The method of claim 1 wherein: said client is causing said first server to execute a transaction when said first connection fails; and said client causes said resource to be rolled back to a savepoint, wherein said savepoint represents an intermediate point in the execution of said transaction.

Claim 12

Dependent Claim 35 words

The method of claim 10 further comprising the step of said client causing said second server to complete the execution of said transaction from said save point after said client connects to said second server.

Claim 13

Dependent Claim 75 words

The method of claim 1 wherein: said client is causing said first server to execute a database instruction when said first connection fails; and the method further includes the steps of said client calculating a checksum based on results returned by said first server; said client using said checksum to determine whether to cause said second server to continue executing said database instruction from where said database instruction was interrupted when said first server failed.

Claim 14

Dependent Claim 43 words

The method of claim 12 further comprising the step of said client using said checksum to complete the execution of said database instruction from where said database instruction was interrupted when said first connection failed after said client connects to said second server.

Claim 15

Dependent Claim 27 words

The method of claim 1 wherein the step of detecting that the first connection has failed includes the step of detecting that the first server has failed.

Claim 16

Dependent Claim 28 words

The method of claim 1 further comprises the step of: after automatically connecting said client with said second sever, said client accessing said resource through said second server.

Claim 17

Dependent Claim 91 words

A computer-readable medium having stored thereon sequences of instructions for recovering after failure of a first connection that was established between a client and a first server for accessing a resource, the sequences of instructions including instructions for performing the steps of: detecting that the first connection between said first server and said client has failed; after detecting the first connection has failed, selecting a second server that has access to said resource; and automatically connecting said client with said second server to establish a second connection for accessing said resource.

Claim 18

Dependent Claim 91 words

A computer-readable medium having stored thereon sequences of instructions for recovering after failure of a first connection that was established between a client and a first server for accessing a resource, the sequences of instructions including instructions for performing the steps of: detecting that the first connection between said first server and said client has failed; after detecting the first connection has failed, selecting a second server that has access to said resource; and automatically connecting said client with said second server to establish a second connection for accessing said resource.

Claim 19

Dependent Claim 87 words

The computer-readable medium of claim 16 wherein: said step of detecting that said first connection between said first server and said client has failed includes the step of detecting that the first connection between a database server application that has access to the resource and a database client application has failed; said step of automatically connecting said client with the second server includes the step of automatically connecting said database client application with a second database server application to establish a second connection for accessing said resource.

Claim 20

Dependent Claim 45 words

The computer-readable medium of claim 17 wherein the step of detecting that said first connection between said database client application and said first server has failed includes the step of detecting that the first server has failed to respond within a predetermined period of time.

Claim 21

Dependent Claim 66 words

The computer-readable medium of claim 16 wherein the step of detecting that a connection between said first server and said client has failed includes the steps of: detecting that said first connection between a database client application and said first server has failed; and notifying said application that said first connection has failed and that access to said resource through said first server has been lost.

Claim 22

Dependent Claim 68 words

The computer-readable medium of claim 19 wherein the step of detecting that said first connection between said database client application and said first server has failed includes the steps of: said client initiating a callback request when making said first connection between said client and said first server; and said client responding to said callback request when said first connection between said client and said first server fails.

Claim 23

Dependent Claim 38 words

The computer-readable medium of claim 16 wherein the sequences of instructions further include instructions for performing the step of said client causing said resource to be rolled back to a valid state after connecting to said second server.

Claim 24

Dependent Claim 55 words

The computer-readable medium of claim 16 wherein: said first server is executing a select command when said first connection fails; and the sequences of instructions further include instructions for performing the step of said client causing said second server to complete execution of said select command after said client is connected to said second server.

Claim 25

Dependent Claim 44 words

The computer-readable medium of claim 16 wherein: said client is causing said first server to execute a transaction when said first connection fails; and said client causes said second server to complete execution of said transaction after said client connects to said second server.

Claim 26

Dependent Claim 63 words

The computer-readable medium of claim 16 wherein: the first connection between the first server and the client constitutes a session; the sequences of instructions further includes instructions for performing the steps of maintaining values that reflect a state of said session at both said client and said first server; and communicating said values to said second server after failure of said first connection.

Claim 27

Dependent Claim 28 words

The computer-readable medium of claim 16 wherein the step of detecting that the first connection has failed includes the step of detecting that the first server has failed.

Claim 28

Dependent Claim 32 words

The computer-readable medium of claim 16 further comprising instructions for performing the step of: after automatically connecting said client with said second sever, said client accessing said resource through said second server.

Claim 29

Independent Claim 133 words

A method for completing a transaction after failure of a first connection that was established between a client and a first server for accessing a resource, the method comprising the steps of: performing a first portion of the transaction on the first server; detecting that the first connection between said first server and said client has failed; after detecting that the first connection between said first server and said client has failed, automatically establishing a second connection between said client and a second server that has access to said resource; and performing a second portion of the transaction on the second server to complete the transaction, wherein performance of the first portion of the transaction includes performance of at least some operations that are not performed by the second portion of the transaction.

Claim 30

Independent Claim 133 words

A method for completing a transaction after failure of a first connection that was established between a client and a first server for accessing a resource, the method comprising the steps of: performing a first portion of the transaction on the first server; detecting that the first connection between said first server and said client has failed; after detecting that the first connection between said first server and said client has failed, automatically establishing a second connection between said client and a second server that has access to said resource; and performing a second portion of the transaction on the second server to complete the transaction, wherein performance of the first portion of the transaction includes performance of at least some operations that are not performed by the second portion of the transaction.

Claim 31

Dependent Claim 59 words

The method of claim 27 wherein: the step of performing a first portion of the transaction includes the step of initiating a select command when said first server fails; and the method further comprises the step of said client causing said second server to complete execution of said select command after said client is connected to said second server.

Claim 32

Dependent Claim 56 words

The method of claim 27 wherein: the first connection between the first server and the client constitutes a session, the method includes the steps of maintaining values that reflect a state of said session at both said client and said first server; and communicating said values to said second server after failure of said first connection.

Claim 33

Dependent Claim 93 words

The method of claim 27 wherein: the step of performing the fist portion of the transaction includes the step of maintaining a savepoint that represents an intermediate point in the execution of said transaction; the step of automatically establishing the second connection includes the step of causing said resource to be rolled back to the savepoint; and the step of performing the second portion of the transaction includes the step of causing said second server to complete the execution of the transaction from said savepoint after said client connects to said second server.

Claim 34

Independent Claim 120 words

A method for recovering after failure of a first connection that was established between a client and a first server for accessing a resource, wherein said first connection constitutes a session between said client and said first server, the method comprising the steps of: executing commands sent by said client to said first server using said session, wherein said session has a state that changes in response to said first server executing said commands; and prior to failure of the first connection, establishing a second connection between the client and a second server that has access to said resource; and pre-parsing on said second server, without executing on said second server, commands sent by said client to said first server.

Claim 35

Independent Claim 120 words

A method for recovering after failure of a first connection that was established between a client and a first server for accessing a resource, wherein said first connection constitutes a session between said client and said first server, the method comprising the steps of: executing commands sent by said client to said first server using said session, wherein said session has a state that changes in response to said first server executing said commands; and prior to failure of the first connection, establishing a second connection between the client and a second server that has access to said resource; and pre-parsing on said second server, without executing on said second server, commands sent by said client to said first server.

Claim 36

Dependent Claim 145 words

A computer-readable medium having stored thereon sequences of instructions for completing a transaction after failure of a first connection that was established between a client and a first server for accessing a resource, the sequences of instructions including instructions for performing the steps of: performing a first portion of the transaction on the first server; detecting that the first connection between said first server and said client has failed; after detecting that the first connection between said first server and said client has failed, automatically establishing a second connection between said client and a second server that has access to said resource; and performing a second portion of the transaction on the second server to complete the transaction, wherein performance of the first portion of the transaction includes performance of at least some operations that are not performed by the second portion of the transaction.

Claim 37

Dependent Claim 145 words

A computer-readable medium having stored thereon sequences of instructions for completing a transaction after failure of a first connection that was established between a client and a first server for accessing a resource, the sequences of instructions including instructions for performing the steps of: performing a first portion of the transaction on the first server; detecting that the first connection between said first server and said client has failed; after detecting that the first connection between said first server and said client has failed, automatically establishing a second connection between said client and a second server that has access to said resource; and performing a second portion of the transaction on the second server to complete the transaction, wherein performance of the first portion of the transaction includes performance of at least some operations that are not performed by the second portion of the transaction.

Claim 38

Dependent Claim 64 words

The computer-readable medium of claim 32 wherein: the step of performing a first portion of the transaction includes the step of initiating a select command when said first server fails; and the computer-readable medium further comprising instructions for performing the step of said client causing said second server to complete execution of said select command after said client is connected to said second server.

Claim 39

Dependent Claim 62 words

The computer-readable medium of claim 32 wherein: the first connection between the first server and the client constitutes a session; the computer-readable medium further including instructions for performing the steps of maintaining values that reflect a state of said session at both said client and said first server; and communicating said values to said second server after failure of said first connection.

Claim 40

Dependent Claim 94 words

The computer-readable medium of claim 32 wherein: the step of performing the first portion of the transaction includes the step of maintaining a savepoint that represents an intermediate point in the execution of said transaction; the step of automatically establishing the second connection includes the step of causing said resource to be rolled back to the savepoint; and the step of performing the second portion of the transaction includes the step of causing said second server to complete the execution of the transaction from said savepoint after said client connects to said second server.

Claim 41

Dependent Claim 132 words

A computer-readable medium having stored thereon sequences of instructions for recovering after failure of a first connection that was established between a client and a first server for accessing a resource, wherein said first connection constitutes a session between said client and said first server, the sequences of instructions including instructions for performing the steps of: executing commands sent by said client to said first server using said session, wherein said session has a state that changes in response to said first server executing said commands; and prior to failure of the first connection, establishing a second connection between the client and a second server that has access to said resource; and pre-parsing on said second server, without executing on said second server, commands sent by said client to said first server.

Claim 42

Dependent Claim 132 words

A computer-readable medium having stored thereon sequences of instructions for recovering after failure of a first connection that was established between a client and a first server for accessing a resource, wherein said first connection constitutes a session between said client and said first server, the sequences of instructions including instructions for performing the steps of: executing commands sent by said client to said first server using said session, wherein said session has a state that changes in response to said first server executing said commands; and prior to failure of the first connection, establishing a second connection between the client and a second server that has access to said resource; and pre-parsing on said second server, without executing on said second server, commands sent by said client to said first server.

Claim 43

Independent Claim 166 words

A method for recovering after failure of a first connection that was established between a client and a first server for accessing a resource, the method comprising the steps of: prior to failure of the first connection, initiating a first transaction on the first server, wherein the transaction causes a first set of data to be sent to an application executing on said client; detecting that the first connection between said first server and said client has failed, wherein the failure of the first connection causes the first transaction to be interrupted; and after detecting the first connection has failed, selecting a second server that has access to said resource; automatically connecting said client with said second server to establish a second connection for accessing said resource; initiating a second transaction, wherein the second transaction is based on the first transaction; and sending a second set of data to the application, where the second set of data causes the failure to be transparent to the application.

Claim 44

Independent Claim 166 words

A method for recovering after failure of a first connection that was established between a client and a first server for accessing a resource, the method comprising the steps of: prior to failure of the first connection, initiating a first transaction on the first server, wherein the transaction causes a first set of data to be sent to an application executing on said client; detecting that the first connection between said first server and said client has failed, wherein the failure of the first connection causes the first transaction to be interrupted; and after detecting the first connection has failed, selecting a second server that has access to said resource; automatically connecting said client with said second server to establish a second connection for accessing said resource; initiating a second transaction, wherein the second transaction is based on the first transaction; and sending a second set of data to the application, where the second set of data causes the failure to be transparent to the application.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	2005-12-02	2006-06-03	2006-12-03	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	2009-12-02	2010-06-03	2010-12-03	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	2013-12-02	2014-06-03	2014-12-03	$7700.00	Window Closed / Lapsed

Automatic failover for clients accessing a resource through a server

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