forked from docs/doc-exports
Hasko, Vladimir
a5cc543164
Reviewed-by: Wagner, Fabian <fabian.wagner@t-systems.com> Co-authored-by: Hasko, Vladimir <vladimir.hasko@t-systems.com> Co-committed-by: Hasko, Vladimir <vladimir.hasko@t-systems.com>
17 lines
1.6 KiB
HTML
17 lines
1.6 KiB
HTML
<a name="ddm_04_0068"></a><a name="ddm_04_0068"></a>
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<h1 class="topictitle1">What High-Reliability Mechanisms Does DDM Provide?</h1>
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<div id="body1503630720106"><div class="section" id="ddm_04_0068__section17232211165316"><h4 class="sectiontitle">Protection of Data Integrity</h4><p id="ddm_04_0068__p47801643155116">DDM instance faults do not affect data integrity.</p>
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<ul id="ddm_04_0068__ul189961921145318"><li id="ddm_04_0068__li133938191511">Service data is stored in shards of data nodes, but not on DDM.</li><li id="ddm_04_0068__li15996721185313">Configuration information of schemas and logical tables is stored in DDM databases. Primary and standby DDM databases are highly available.</li></ul>
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<div class="section" id="ddm_04_0068__section0993540155216"><h4 class="sectiontitle">High Availability</h4><p id="ddm_04_0068__p12476105045220">DDM is deployed using multiple stateless nodes in cluster mode and provides services through the IP address bound to your load balancer.</p>
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<ul id="ddm_04_0068__ul14497141416410"><li id="ddm_04_0068__li3497814444">If one DDM node becomes faulty, an error is returned for connections established on the node, without affecting the DDM cluster. The faulty node is generally deleted from the cluster within 5 seconds.</li><li id="ddm_04_0068__li174971014748">If a data node becomes faulty, services can be restored within 30 seconds after the data node is recovered.</li></ul>
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<div class="parentlink"><strong>Parent topic:</strong> <a href="ddm_04_0066.html">General Questions</a></div>
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