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https://issues.apache.org/jira/browse/IGNITE-6843?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Vladimir Ozerov reassigned IGNITE-6843:
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Assignee: Kirill Shirokov
> SQL: optionally do not use WAL when executing CREATE INDEX
> ----------------------------------------------------------
>
> Key: IGNITE-6843
> URL: https://issues.apache.org/jira/browse/IGNITE-6843
> Project: Ignite
> Issue Type: Task
> Security Level: Public(Viewable by anyone)
> Components: sql
> Affects Versions: 2.3
> Reporter: Vladimir Ozerov
> Assignee: Kirill Shirokov
> Labels: iep-1, performance
> Fix For: 2.4
>
>
> Inspired by Oracle {{NOLOGGING}} option [1].
> When an index is being created through {{CREATE INDEX}} command, every single
> index update is written to WAL. Let's introduce special mode where updates
> are not written to WAL:
> 1) Index updates during an index_create operation are not written to WAL
> 2) When the index is ready, force a checkpoint and wait for it to happen
> 3) Purge index data if node crashed before checkpoint
> Alternatively, we may even not trigger a checkpoint, hoping that that node
> will not crash before the nearest checkpoint is finished. If node crashed
> during this time window, the index should be marked as "invalid", and not
> used for queries. Then the user should either re-create or rebuild it.
> [1]
> https://docs.oracle.com/cd/B19306_01/server.102/b14200/statements_5010.htm#i2182589
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