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akorotkov.github.io
| | nenadnoveljic.com
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| | A frequently executed SQL causes problems with the initial incremental statistics calculation.
| | jonathanlewis.wordpress.com
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| | A couple of weeks ago, having just arrived home from Spain, I got a phone call in Heathrow airport from an old client that I hadn't seen for about 18 months. They had a problem; as far as they could tell a business critical query had suddenly stopped using an index and was doing a...
| | tonyhasler.wordpress.com
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| | When a table is accessed by multiple members of a parallel query server set, the execution plan may show the use of block range granules (PX BLOCK ITERATOR) or partition granules (PX PARTITION [RANGE|LIST|HASH] ITERATOR or PX PARTITION [RANGE|LIST|HASH] ALL). The basic ideas surrounding these concepts are discussed in numerous blogs and books, including my...
| | nenadnoveljic.com
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| Oracle's heuristics previously avoided considering fixed tables for Join Predicate Pushdown (JPPD) transformation, leading to suboptimal plans. Enforcing predicate pushing into the view with the PUSH_PRED hint was a workaround. Oracle addressed this in the 21c release, evaluating fixed tables for JPPD.