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https://issues.apache.org/jira/browse/CLOUDSTACK-8606?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Koushik Das resolved CLOUDSTACK-8606.
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Resolution: Fixed
> DB performance impacted due to VM sync.
> ---------------------------------------
>
> Key: CLOUDSTACK-8606
> URL: https://issues.apache.org/jira/browse/CLOUDSTACK-8606
> Project: CloudStack
> Issue Type: Bug
> Security Level: Public(Anyone can view this level - this is the
> default.)
> Components: Management Server, Upgrade
> Affects Versions: 4.5.0
> Reporter: Koushik Das
> Assignee: Koushik Das
> Fix For: 4.6.0
>
>
> VM sync. generates a lot of queries on vm_instance table with 'instance_name'
> as filter. Since the field is not
> indexed, these kind of queries will impact DB performance.
> The issue is visible with deployments having more than 4000 VMs. VM sync.
> runs every 'ping.interval' and in each run generates individual queries for
> all VMs. If the MS is left running for a few hours, its response deteriorates
> drastically.
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