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A time ago I came across a problem which inspired me to write this article.It also made me thinking how important it is to understand the client’s business model.Not that you need to get in depth of it – most of the cases we remain within the specifics of SQL.The optimistic side of it, with…
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This post is the continuation of the previous part. Clustering Factor – tests with 10046 Let’s go through the cases represented by SELECT statements and examine the true effort measured with the number of physical reads which are hidden behind a query retrieving its data from the table, yet by the means of either one:…
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Latest posts
- Be cautious when the optimizer estimates a cardinality of 1 – Part2
- Be cautious when the optimizer estimates a cardinality of 1 – Part1
- Be cautious when the optimizer estimates a cardinality of 1 – Part3
- When OEM meets the CBO: cardinality chaos across containers – Part 1
- When OEM meets the CBO: cardinality chaos across containers – Part 2
- Auto SQL Plan Management (look under the hood) – part 1
- Auto SQL Plan Management (look under the hood) – part 3
- Auto SQL Plan Management (look under the hood) – part 2
- Converting of CPU Costing in the Cost Based Optimizer 10053 Trace File
- Why this extra physical read while performing index scan?