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https://issues.apache.org/jira/browse/IGNITE-8591?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Vladimir Ozerov closed IGNITE-8591.
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> SQL: Sort links on index pages in physical page order before row access
> -----------------------------------------------------------------------
>
> Key: IGNITE-8591
> URL: https://issues.apache.org/jira/browse/IGNITE-8591
> Project: Ignite
> Issue Type: Task
> Components: sql
> Affects Versions: 2.5
> Reporter: Vladimir Ozerov
> Assignee: Vladimir Ozerov
> Priority: Major
> Labels: performance
>
> When index page match condition, we eagerly read all matched data rows. This
> leads to a number of random disk reads.as Ignite use heap-organized storage.
> We can pre-sort all matched row links in accordance to their physical
> location, and then read them in batch. This will give us two important
> advantages:
> 1) Data reads will be more sequential, this is especially important for HDDs
> 2) This could decrease number of page reads in case of dense data placement,
> because there will be less evictions.
> In future we should expand this optimization to several index pages in the
> same way it is done in major databases.
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