A system, method, and computer-readable medium that facilitate management of data skew during a parallel multiple join operation are provided. Portions of tables involved in the join operation are distributed among a plurality of processing modules, and each of the processing modules is provided wit ...
A system and method for using failure casting to manage failures in a computer system. In accordance with an embodiment, the system uses a failure casting hierarchy to cast failures of one type into failures of another type. In doing this, the system allows incidents, problems, or failures to be cas ...
Several methods and a system of a replicated service for write ahead logs are disclosed. In one embodiment, a method includes persisting a state of a distributed system through a write ahead log (WAL) interface. The method also includes maintaining a set of replicas of a WAL through a consensus prot ...
A computer-implemented method, apparatus and article of manufacture for optimizing a database query. Resource usage of one or more resources of the computer system are monitored. A condition code representative of the monitored resource usage is stored. A cost model is modified using the stored cond ...
A database system receives information relating to a job requested by a requestor, where the job includes a plurality of requests. Execution of the requests of the job is managed using the received information, where managing the requests includes adjusting one or more of priority settings and resou ...
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 ...
A system, method, and computer-readable medium that facilitate management of data skew during a parallel join operation are provided. Portions of tables involved in the join operation are distributed among a plurality of processing modules, and each of the processing modules is provided with a list ...
An execution plan for executing one or more iterations of recursive database queries can be generated in accordance with one aspect of the invention. For example, in accordance with one embodiment of the invention, one or more cardinalities (results or size of results, including intermediate results ...
A system, method, and computer-readable medium for optimization of query processing in a parallel processing system are provided. Skewed values and non-skewed values are treated differently to improve upon conventional DISTINCT and aggregation query processing. Skewed attribute values on which a DIS ...
An event tap associated with a server, such as a Web server, at a machine can transform a server event into a tuple, select a database node for the tuple, and place the tuple in a queue for that database node, and then flush the queue periodically directly into database nodes. The use of an event ta ...
