Specifying just the table title (or alias) is the popular way of halting an entire Table Scan. If the stats are calculated towards the tables and indexes, Oracle really should pick the finest offered index.
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All rows in the outer desk are broadcast to each query server. The internal desk rows are randomly partitioned.
To get a column getting only two unique values, the optimizer assumes Every price seems in 50% with the rows, so the associated fee-dependent approach is likely to choose a complete desk scan rather than an index scan.
Generally, in case you review the tables, then the optimizer selects an economical star strategy. You can also use hints to Enhance the program. Probably the most precise technique is always to get the tables during the FROM clause within the get with the keys during the index, with the big table very last. Related Site Then description use the following hints:
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Whether or not the hint is given, there is not any warranty which the transformation will take place. The optimizer only generates the subqueries if original site it seems fair to do so.
If selected indexes are provided as arguments, then the optimizer attempts to use some Boolean combination of These specific bitmap indexes.
This hint is usually recommended when the volume of partitions of your outer table is equal to or almost equivalent to a various of the number of question servers; for instance, fourteen partitions and 15 question servers.
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