Postgres-XC tutorial PDF - PGCon
Postgres-XC tutorial PDF - PGCon
Postgres-XC tutorial PDF - PGCon
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Constraints<br />
●<br />
●<br />
<strong>XC</strong> does not support Global constraints – i.e. constraints<br />
across datanodes<br />
Constraints within a datanode are supported<br />
Distribution strategy Unique, primary key constraints Foreign key constraints<br />
Replicated Supported Supported if the referenced table is<br />
also replicated on the same nodes<br />
Hash/Modulo distributed<br />
Supported if primary OR unique<br />
key is distribution key<br />
Supported if the referenced table is<br />
replicated on same nodes OR it's<br />
distributed by primary key in the<br />
same manner and same nodes<br />
Round Robin Not supported Supported if the referenced table is<br />
replicated on same nodes<br />
May 16th, 2012 <strong>Postgres</strong><strong>XC</strong> 60
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