Greenplum 如何直连segment节点

• Greenplum

 

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直连greenplum segment节点的方法, utility模式 : 
使用这种方式，不与其他节点通讯，只操作当前节点。也没有数据分布的概念。
如果使用utility模式连接的是master节点，写入数据时，数据不会分布到segment，使用正常模式连接后，写入master的数据也查不出来。

$  PGOPTIONS='-c gp_session_role=utility' psql -p 40005
psql (8.2.15)
Type "help" for help. postgres=# \dt List of relations Schema | Name | Type | Owner | Storage --------+------+-------+----------+--------- public | t | table | digoal | heap public | test | table | digoal | heap (2 rows) postgres=# select * from pg_locks; locktype | database | relation | page | tuple | transactionid | classid | objid | objsubid | transaction | pid | mode | granted | mppsessionid | mppiswriter | gp_segment_id ---------------+----------+----------+------+-------+---------------+---------+-------+----------+-------------+--------+-----------------+---------+--------------+-------------+--------------- transactionid | | | | | 136604 | | | | 136604 | 130724 | ExclusiveLock | t | 6 | t | -1 relation | 10899 | 10333 | | | | | | | 136604 | 130724 | AccessShareLock | t | 6 | t | -1 (2 rows) 注意使用PGOPTIONS='-c gp_session_role=utility'后，只操作本地节点 $psql -p # master psql (8.2.15) Type "help" for help. postgres=# select count(*) from test; count ------- 0 (1 row) postgres=# \q $psql -p 40001 # segment psql (8.2.15) Type "help" for help. postgres=# select count(*) from test; count --------- 4166801 (1 row)

 

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转载于:https://www.cnblogs.com/xibuhaohao/p/11119169.html