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It is therefore no surprise that we can use indexes to avoid the sort operation to satisfy an order by clause. Ironically, an INDEX RANGE SCAN also becomes ...
It is not about the star, stupid: selecting unnecessary columns is bad. ... you don't need them. And they all boil down to performance. What is surprising, however, ...
Not all LIKE filters are slow: the performance depends on the position of the wild ... has a longer prefix that narrows the scanned index range down to two rows.
For a regular heap table—which has no particular row order—the database can take any table block ... Each additional index slows the execution down further.
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It is, however, no surprise that the queries get slower when the data volume grows. But the striking gap between the two indexes is somewhat unexpected. What is ...
Earlier releases provide the pseudo column ROWNUM that numbers the rows in the result set automatically. It is, however, not possible to apply a greater than or ...
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ORDER BY doesn't need to slow down your query. ... SQL queries with an order by clause do not need to sort the result explicitly if the relevant index already ...
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