摘要:
An optimization technique is provided that optimizes data access by mapping each table, or row and/or column in a table, to a particular query, depending on whether the data in said table, row or column is ‘hot’ or ‘cold’ data. In one aspect, the invention features a method for optimizing the access time of an SQL query to a database including data. The method includes receiving, for each query type, a data frequency access measure and associating each query type with a processing rule set, according to the received data frequency access measure.
摘要:
A test system receives environment information of a target database system, where the environment information includes information relating to hardware and software components of the target database system, and one or more of: definitions of workloads in the target database system, and settings of a scheduler in the target database system. The test system emulates an environment of the target database system using the received environment information, and database software is executed in the emulated environment in the test system.
摘要:
A method, computer program, and system are disclosed for executing a utility on a database system having a plurality of database system nodes. Each database system node has an existing load. An increased load on the database system required to execute the utility is determined. The existing load on each of the database system nodes is determined. The increased load is distributed in such a way as to balance the load among the database system nodes.
摘要:
A database system includes an optimizer to generate resource estimates regarding execution of a request in the database system, and a regulator to monitor progress of execution of the request (and in some examples every step of the request), and to adjust the resource estimates based on the monitored progress. The regulator also adjusts a priority setting of the request according to the adjusted resource estimates.
摘要:
Computing capacity of a computing environment can be managed by controlling it associated processing capacity based on a target (or desired) capacity. In addition, fine-grained control over the processing capacity can be exercised. For example, a computing system can change the processing capacity (e.g., processing rate) of at least one processor operating based on a target capacity. The computing system may also be operable to change the processing capacity based on a measured processing capacity (e.g., a measured average of various processing rates of a processor taken over a period of time when a processor may have been operating at different processing rates over that period). By way of example, the processing rate of a processor can be switched between 1/8 and 2/8 of a maximum processing rate to achieve virtually any effective processing rates between them.
摘要:
A system, method, and computer-readable medium that provide virtual user access to a database system are provided. Middle-tier application end users issue requests to a middle-tier application that submits the requests to a database system on behalf of the middle-tier end users. The middle-tier application may authenticate end users and maintain a session pool for maintaining sessions with the database system for virtual users comprising valid middle-tier application end users. The middle-tier application is able to assert the identity of virtual users corresponding to the end users for use in access rights checking and auditing of queries without establishing a new logon session for the user. To facilitate middle-tier application assertion of virtual user identities, the middle-tier application is registered as a valid database user with the database system.
摘要:
A system and method for managing database systems, wherein the database systems perform database queries to retrieve data stored by the database systems. One or more regulators are used for managing the database systems, wherein a database tuning agent function of the regulator uses statistics on physical and logical data access in order to perform automated block size management for database objects.
摘要:
A method and apparatus of analyzing a target system comprises receiving information relating to an environment of the target system and storing cost data based on the environment information. The plan and its estimated performance for a query may be determined based on the cost data. The environment information may pertain to the environment of a parallel system (e.g., a multi-node parallel system, a single-node parallel system having plural central processing units or a system running plural virtual processors) that is running a parallel database. The cost data may identify a number of nodes in the target system, a number of central processing units in each node of the target system, and other types of system information. The cost data may be stored in a relational table having a plurality of rows. Each row of the relational table may correspond to a different target system. The cost data is used to emulate the environment of the target system and is usable by an optimizer module to derive a query plan for an SQL (structured query language) query having the lowest (or lower) cost.
摘要:
A computer-implemented method, system and article of manufacture for managing workloads in a computer system, comprising monitoring system conditions and operating environment events that impact on the operation of the computer system, regulating execution of one or more queries based on the monitored system conditions and operating environment events using arrival rate throttles, and performing the queries to access data in a database for presentation and use to a user.
摘要:
A system for managing a plurality of systems, includes a domain comprised of a plurality of systems, wherein the systems are managed by one or more closed-loop system management (CLSM) regulators. A virtual regulator manages operational characteristics of the domain and the plurality of systems, by communicating with the CLSM regulators to monitor the systems' states, events and conditions within the domain and to adjust the systems' operational characteristics in response to the systems' states, events and conditions.