Estimating Progress of Execution for SQL Queries
ثبت نشده
چکیده
منابع مشابه
Multi-query SQL Progress Indicators
Recently, progress indicators have been proposed for SQL queries in RDBMSs. All previously proposed progress indicators consider each query in isolation, ignoring the impact simultaneously running queries have on each other’s performance. In this paper, we explore a multi-query progress indicator, which explicitly considers concurrently running queries and even queries predicted to arrive in th...
متن کاملKAMD: A Progress Estimator for MapReduce Pipelines
Limited user-feedback exists in cluster computing environments such as MapReduce. Accurate, time-oriented progress indicators could provide much utility to users in this domain, where job execution times can have high variance due to the amount of data being processed, the amount of parallelism available, and the types of operators (often user-defined) that perform the processing. This feedback...
متن کاملMap Combine Map Task Split HDFS file K 1 , N 1 ( a ) Reduce Task { P 2 } { P 1 } { P 3 }
In parallel query-processing environments, accurate, time-oriented progress indicators could provide much utility to users given that queries take a very long time to complete and both interand intra-query execution times can have high variance. In these systems, query times depend on the query plans and the amount of data being processed, but also on the amount of parallelism available, the ty...
متن کاملUltrawrap: SPARQL execution on relational data
The Semantic Web’s promise to achieve web-wide data integration requires the inclusion of legacy relational data as RDF, which, in turn, requires the execution of SPARQL queries on the legacy relational database. In this paper we explore a hypothesis: existing commercial relational databases already subsume the algorithms and optimizations needed to support effective SPARQL execution on existin...
متن کاملNested Query Optimization in Relational Database
Many database applications perform complex data retrieval and update tasks. Nested queries, and queries that invoke user-defined functions, which are written using a mix of procedural and SQL constructs, are often used in such applications. A straight-forward evaluation of such queries involves repeated execution of parameterized sub-queries or blocks containing queries. This work discusses imp...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2004