Postgres-XC tutorial PDF - PGCon
Postgres-XC tutorial PDF - PGCon
Postgres-XC tutorial PDF - PGCon
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Querying replicated tables<br />
●<br />
Example: simple SELECT on replicated table<br />
CREATE TABLE tab1 (val int, val2 int)<br />
DISTRIBUTE BY REPLICATION TO NODE datanode_1, datanode_2;<br />
EXPLAIN VERBOSE SELECT * FROM tab1 WHERE val2 = 5;<br />
QUERY PLAN<br />
<br />
Result<br />
Output: val, val2<br />
> Data Node Scan on tab1 Queries the datanode/s<br />
Output: val, val2<br />
Node/s: datanode_1 one node out of two is chosen<br />
Remote query: SELECT val, val2 FROM ONLY tab1 WHERE (val2 = 5)<br />
May 16th, 2012 <strong>Postgres</strong><strong>XC</strong> 47
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