Chao Liang

US Patent:

7752225, Jul 6, 2010

Filed:

Oct 16, 2007

Appl. No.:

11/873410

Inventors:

David Kogan - San Mateo CA, US
Rajendra S. Pingte - Foster City CA, US
Chao Liang - Fremont CA, US
Yujie Cao - Redwood Shores CA, US

Assignee:

Oracle International Corporation - Redwood Shores CA

International Classification:

G06F 7/00
G06F 17/30

US Classification:

707793, 707809, 718 1, 718104

Abstract:

Techniques for migrating duration trees from a source database server (or instance) to a destination database server (or instance) are provided. A duration is a memory management construct that allows database components to group related areas of memory together. A source duration tree is captured at the source database server and combined with a destination duration tree at the destination database server. Any duration identifiers in the source duration tree that conflict with (i. e. , are the same as) a duration identifier in the destination duration tree are mapped to new duration identifiers.

US Patent:

7984015, Jul 19, 2011

Filed:

May 3, 2007

Appl. No.:

11/800122

Inventors:

Karl Dias - Foster City CA, US
Leonidas Galanis - San Jose CA, US
Jonathan Klein - Redwood City CA, US
Venkateshwaran Venkataramani - Sunnyvale CA, US
Yujun Wang - Cupertino CA, US
Richard Sarwal - Portola Valley CA, US
Leng Tan - Sunnyvale CA, US
Graham Wood - El Granada CA, US
Benoit Dageville - Foster City CA, US
Chao Liang - Fremont CA, US
Sanjay Kaluskar - Menlo Park CA, US

Assignee:

Oracle International Corporation - Redwood Shores CA

International Classification:

G06F 7/00
G06F 17/00

US Classification:

707610, 709248

Abstract:

A method and apparatus for capturing database system workload and replaying that workload in a database system is provided. According to one aspect, in order to subject a test database system to the same workload to which the production database system actually would be subjected, a database server in the production system captures and records workload that the database server receives from external entities. This captured workload is processed. Processes external to a database server in the test database system send the processed workload to that database server. As a result, the test database system is subjected to the same workload to which the production database system originally was subjected. The foregoing technique permits a database administrator to determine how the production database system will fare if the difference that is present in the test database system is introduced into the production database system.

US Patent:

20060059228, Mar 16, 2006

Filed:

May 17, 2005

Appl. No.:

11/131653

Inventors:

Ravikanth Kasamsetty - Union City CA, US
Ravi Koti - Bangalore, IN
Sanjay Kaluskar - Menlo Park CA, US
Chao Liang - Fremont CA, US

Assignee:

ORACLE INTERNATIONAL CORPORATION - REDWOOD SHORES CA

International Classification:

G06F 15/16

US Classification:

709203000

Abstract:

A method and apparatus for migrating the session state of an original session from a first node to a second node, such that a process, executing in the migrated session, may enqueue and dequeue messages from a queue of messages and experience the same behavior from the queue of messages as if the process was enqueuing and dequeuing messages in the original session. Advantageously, all the benefits of migrating a session from one node to another node may be realized, even when the session contains queuing state information that describes the state of a queue of messages. Data that indicates how many messages one or more subscribers have removed from the queue of messages may also be stored to preserve proper behavior of the queue of messages for multiple subscribers when sessions are migrated.

US Patent:

20100005097, Jan 7, 2010

Filed:

Jul 1, 2008

Appl. No.:

12/166272

Inventors:

Chao Liang - Fremont CA, US
Feng Cao - Belmont CA, US
Rajendra Pingte - Foster City CA, US

Assignee:

ORACLE INTERNATIONAL CORPORATION - Redwood Shores CA

International Classification:

G06F 17/30
G06F 12/00

US Classification:

707 8, 707201, 707E17032, 707E17134

Abstract:

Techniques are described herein for capturing and restoring database session state. Production database server components save the session state of each of a plurality of database sessions. The components store workload units that are processed in these sessions. The components store updated session states in response to certain events. Thus, the components may capture multiple session states, pertaining to various different points in time, for each session. The captured session states and the captured workload are moved to a test database server. A user selects, from among the time points represented by the session states, a point in time at which the user would like workload replay to begin. Sessions are re-created on the test database server. Session states of these sessions are set to reflect the session states as they existed at the user-selected time point. Workload units are replayed in the sessions relative to the test database server.

US Patent:

20100042668, Feb 18, 2010

Filed:

Dec 14, 2007

Appl. No.:

12/450212

Inventors:

Chao Liang - Brooklyn NY, US
Yang Guo - Plainsboro NJ, US
Yong Liu - Brooklyn NY, US

Assignee:

Thomson Licensing - Boulogne-Billancourt

International Classification:

G06F 15/16

US Classification:

709201, 709209, 709225

Abstract:

A HCPS (hierarchically clustered P2P streaming system) comprising peers grouped into clusters and hierarchies. The HCPS actively balances the uploading capabilities among clusters and executes an optimal scheduling algorithm within each cluster to ensure that system resources are optimally utilized. The HCPS comprises an architecture which can be used in practical applications, yet can achieve the streaming rate close to the theoretical upper bound.

US Patent:

20110173265, Jul 14, 2011

Filed:

May 28, 2008

Appl. No.:

12/993412

Inventors:

Chao Liang - Brooklyn NY, US
Yang Guo - West Windsor NJ, US
Yong Liu - Brooklyn NY, US

Assignee:

Thomson Licensing LLC - Princeton NJ

International Classification:

G06F 15/16

US Classification:

709205

Abstract:

A method and apparatus are described including receiving data from a plurality of cluster heads and forwarding the data to peers. Also described are a method and apparatus including calculating a sub-stream rate, splitting data into a plurality of data sub-streams and pushing the plurality of data sub-streams into corresponding transmission queues. Further described are a method and apparatus including splitting source data into a plurality of equal rate data sub-streams, storing the equal rate data sub-streams into a sub-server content buffer, splitting buffered data into a plurality of data sub-streams, calculating a plurality of sub-stream rates and pushing the data sub-streams into corresponding transmission queues.

US Patent:

20130325841, Dec 5, 2013

Filed:

Jun 5, 2012

Appl. No.:

13/488739

Inventors:

Tanvir Ahmed - Hayward CA, US
Thomas Keefe - Mill Valley CA, US
Chao Liang - San Ramon CA, US
Vikram Pesati - San Jose CA, US

International Classification:

G06F 17/30

US Classification:

707713, 707E17017

Abstract:

Techniques are provided for a database server to identify a query that comprises an access check operator specifying a data access control policy, and if so, to re-write the query to produce an optimized query execution plan. A first technique rewrites a query comprising an access check operator based on the privileges associated with the database principal requesting the query. The rewritten query exposes the access predicates relevant to the requesting principal to subsequent database optimization processes. A second technique rewrites a query comprising an access check operator that specifies a data security policy that does not include a denied privilege. A third technique rewrites a query that comprises an access check operator specifying one or more database table columns that store row-specific access control lists. The rewritten queries are used to generate a query execution plan that provides for several query execution optimizations.

US Patent:

20190243987, Aug 8, 2019

Filed:

Apr 15, 2019

Appl. No.:

16/384283

Inventors:

- Redwood Shores CA, US
Yi Ru - Belmont CA, US
Chao Liang - San Ramon CA, US
Vikram Reddy Pesati - San Jose CA, US

International Classification:

G06F 21/62
G06F 16/23
H04L 29/06
G06F 16/25
G06F 16/28

Abstract:

Embodiments allow, within database security policies, the grant of data change operation-specific privileges to particular users to be applied within particular data realms in a given table. Furthermore, according to one or more embodiments, User Privilege column-level privileges are explicitly associated with one or more data access operations such that the grant of such a column-level privilege allows the user to perform only those data access operations that are explicitly associated with the column-level privilege. Enforcement of the data security policies includes prevention of data leakage via WHERE and RETURNING INTO clauses. According to one or more embodiments, a two-phase rewrite is used to optimize enforcement of column-level privileges. During the two-phase rewrite of a given query, the privileges checked during enforcement of the User Privilege data security policies are pruned to avoid unnecessary privilege checks given the columns that are accessed in the query.