619 search results - page 61 / 124 » Query Planning in Infomaster |
174
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VLDB
2001
ACM
15 years 8 months ago
2001
ACM
Most modern DBMS optimizers rely upon a cost model to choose the best query execution plan (QEP) for any given query. Cost estimates are heavily dependent upon the optimizer’s e...
226
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SIGMOD
2009
ACM
16 years 4 months ago
2009
ACM
SQL tuning--the attempt to improve a poorly-performing execution plan produced by the database query optimizer-is a critical aspect of database performance tuning. Ironically, as ...
128
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SIGMOD
2004
ACM
16 years 4 months ago
2004
ACM
Ranking is an important property that needs to be fully supported by current relational query engines. Recently, several rank-join query operators have been proposed based on rank...
125
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CCGRID
2005
IEEE
15 years 9 months ago
2005
IEEE
Partial replication is one type of optimization to speed up execution of queries submitted to large datasets. In partial replication, a portion of the dataset is extracted, re-org...
150
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CIKM
2005
Springer
15 years 9 months ago
2005
Springer
Modern query optimizers select an efficient join ordering for a physical execution plan based essentially on the average join selectivity factors among the referenced tables. In ...