摘要:
A method and system of subsetting a group of server systems configures a server system with a group name and a group port, and with at least one subset name and subset port. The server system, when activated, reads its configuration and registers with a system routing entity as being part of the group name and the group port, and as being part of the subset name and the subset port. In this manner, server systems can be targeted via its subset name and subset port, while also accessible via the common name and port for the group. If the group includes a workload balancer, the server system also registers with the workload balancer using the group name and the subset name, such that workload balancing is provided for the subset.
摘要:
A method and apparatus for configuring a plurality of server systems. In one implementation, the method includes configuring the plurality of server systems as a first database having a group name and a group port, and configuring a subset of the plurality of server systems as a second database having a subset name and a subset port. The first database is accessible by a client application via the group name and the group port for storage of data in the first database, and the second database is accessible by a client application via the subset name and the subset group for storage of data in the second database.
摘要:
A shared memory device called the Coupling Facility (CF) is used to record the indoubt transaction entries for each member of the database cluster, avoiding the CPU cost and elapsed time impact of persisting this information to disk (either via a log write or a relational table I/O). The CF provides full read/write access and data coherency for concurrent access by all the members in the database cluster. At any given point in time, the CF will contain the full list of indoubt transactions for the entire database cluster. CF duplexing is used to guarantee the integrity of the CF structure used for the indoubt list. In the event of complete loss of both CF structures (which will not happen except in major disaster situations), data sharing group restart processing can reconstruct the CF structures from the individual member logs.
摘要:
A method and system for providing package resolution in a database system is disclosed. The method and system comprise providing a statement within a server which allows an application to identify a list of package collections. The method and system further includes executing the statement to obtain the appropriate package. A system and method in accordance with the present invention provides a new current package path value, which is set via a statement referred to as Set Current Package Path. The SET CURRENT PACKAGE PATH statement allows the application to supply a precedence list of qualified package collections during execution time, therefore the scheme for resolving packages can be changed at any point during execution. The SET CURRENT PACKAGE PATH statement improves application development by making the package resolution mechanism less error prone and less tedious for the application developer, while providing an optimal-performance solution in the client-server environment.
摘要翻译:公开了一种在数据库系统中提供打包分辨率的方法和系统。 方法和系统包括在服务器内提供允许应用程序识别包集合列表的语句。 该方法和系统还包括执行该语句以获得适当的包。 根据本发明的系统和方法提供新的当前包路径值,其通过称为设置当前包路径的语句来设置。 SET CURRENT PACKAGE PATH语句允许应用程序在执行时间内提供合格的包集合的优先列表,因此可以在执行期间的任何时候更改解决包的方案。 SET CURRENT PACKAGE PATH语句通过使程序包解析机制对于应用程序开发人员而言更不容易出错,更乏味,同时在客户端 - 服务器环境中提供最佳性能解决方案,从而改进了应用程序开发。
摘要:
A shared memory device called the Coupling Facility (CF) is used to record the indoubt transaction entries for each member of the database cluster, avoiding the CPU cost and elapsed time impact of persisting this information to disk (either via a log write or a relational table I/O). The CF provides full read/write access and data coherency for concurrent access by all the members in the database cluster. At any given point in time, the CF will contain the full list of indoubt transactions for the entire database cluster. CF duplexing is used to guarantee the integrity of the CF structure used for the indoubt list. In the event of complete loss of both CF structures (which will not happen except in major disaster situations), data sharing group restart processing can reconstruct the CF structures from the individual member logs.
摘要:
Techniques are provided for processing data. It is determined that a portion of a data stream to be transmitted includes a security-sensitive portion. The security-sensitive portion of the data stream is encrypted. The data stream with the encrypted security-sensitive portion is transmitted.
摘要:
Indoubt transaction entries are recorded for each member of a database cluster, thereby avoiding the CPU cost and elapsed-time impact of persisting this information to a disk (either via a log write or a relational table I/O). This implementation allows for full read/write access and data coherency for concurrent access by all the members in the database cluster. At any given point in time, a full list of indoubt transactions is maintained for the entire database cluster in a relational table (e.g., an SQL table).
摘要:
In a method and system for avoiding section collision for application server requests over a single database connection, the database server assigns query identifiers to each instance of the same cursor opened for the same processing level within an application, allowing multiple instances of the same cursor to be processed in parallel without section collision. The application server assigns a command source identifier to each statement sent over a single database connection to uniquely identify the application source of the statement. This applies for multiples of the same statement sent by different application sources within the same application, for a single statement containing multiple application sources, and for multiple statements from different applications multiplexed over a single database connection. These statements can be processed separately from and in parallel with the each other without section collision.
摘要:
A method, apparatus and program storage device is provided for dynamic data formatting during transmittal of generalized byte string data across a computer network. Remote server dynamically changes format of each column string data value from the result set separately, according to actual size of the string data value, and returns it to a client. Small-size data value is returned in a single network return message as varchar type, in-line with the rest of the query data. Medium-sized data value is retrieved without locators and streamed in multiple return network messages in a separate data object following the query data and in the same response. Large-size data value is retrieved using locators and returned as a progressive reference in pieces of specified size, where each piece of data value is separately transferred under client's control when needed, thus eliminating the need to buffer large amount of data.
摘要:
An embodiment of the present invention enables manipulation of data on a remote server and ensures uniqueness of data identifiers in a multi-tier environment, where a database client communicates through one or more intermediate servers to reach the target server containing the remote database. In particular, a client system transmits a query to the target server via a gateway system and receives a handle or data reference and a query identification for subsequent manipulation of data residing on that target server. A new query identification is generated by the gateway system and mapped with the query identification of the intended target server. When the client system transmits a query with the gateway query identification, the gateway system performs a lookup operation to identify the corresponding target server and subsequently forwards the query and target server query identification to the identified target server for processing.