来迁移数据管道

磁盘空间不足的条件，使用命名管道或匿名的迁移和进口数据；请注意，命名管道必须权限问题。

0. Name PIP 0
[pg@h1 ~]$ psql gtlions -ac "select 't3' tab,count(*) from t3 union all select 't4',count(*) from t4;"
select 't3' tab,count(*) from t3 union all select 't4',count(*) from t4;
 tab | count
-----+-------
 t3  |   100
 t4  |     0
(2 rows)
 
[pg@h1 ~]$ mknod syncpip p
[pg@h1 ~]$ psql gtlions -p 5432 -c "copy t3 to '/home/pg/sync'"|psql gtlions -p 5432 -c "copy t4 from '/home/pg/sync'"  
ERROR:  could not open file "/home/pg/sync" for reading: No such file or directory
[pg@h1 ~]$ psql gtlions -p 5432 -c "copy t3 to '/home/pg/syncpip'"|psql gtlions -p 5432 -c "copy t4 from '/home/pg/syncpip'"  
COPY 100
[pg@h1 ~]$ psql gtlions -p 5432 -c "copy t3 to '/home/pg/syncpip'"|psql gtlions -p 5432 -c "copy t4 from '/home/pg/syncpip'"        
COPY 100
[pg@h1 ~]$ psql gtlions -p 5432 -c "copy t3 to '/home/pg/syncpip'"|psql gtlions -p 5432 -c "copy t4 from '/home/pg/syncpip'"  
COPY 100
[pg@h1 ~]$ psql gtlions -p 5432 -c "copy t3 to '/home/pg/syncpip'"|psql gtlions -p 5432 -c "copy t4 from '/home/pg/syncpip'"  
COPY 100
[pg@h1 ~]$ psql gtlions -ac "select 't3' tab,count(*) from t3 union all select 't4',count(*) from t4;"
select 't3' tab,count(*) from t3 union all select 't4',count(*) from t4;
 tab | count
-----+-------
 t3  |   100
 t4  |   400
(2 rows)
1. Name PIP 1
[pg@h1 ~]$ rm -rf sync*
[pg@h1 ~]$ mkfifo syncpip
[pg@h1 ~]$ ll syncpip
prw-rw-r-- 1 pg pg 0 11月  6 09:15 syncpip
[pg@h1 ~]$ psql gtlions -p 5432 -c "copy t3 to '/home/pg/syncpip'"|psql gtlions -p 5432 -c "copy t4 from '/home/pg/syncpip'"  
COPY 100
[pg@h1 ~]$ psql gtlions -p 5432 -c "copy t3 to '/home/pg/syncpip'"|psql gtlions -p 5432 -c "copy t4 from '/home/pg/syncpip'"  
COPY 100
[pg@h1 ~]$ psql gtlions -p 5432 -c "copy t3 to '/home/pg/syncpip'"|psql gtlions -p 5432 -c "copy t4 from '/home/pg/syncpip'"  
COPY 100
[pg@h1 ~]$ psql gtlions -p 5432 -c "copy t3 to '/home/pg/syncpip'"|psql gtlions -p 5432 -c "copy t4 from '/home/pg/syncpip'"  
COPY 100
[pg@h1 ~]$ psql gtlions -ac "select 't3' tab,count(*) from t3 union all select 't4',count(*) from t4;"
select 't3' tab,count(*) from t3 union all select 't4',count(*) from t4;
 tab | count
-----+-------
 t3  |   100
 t4  |   800
(2 rows)
 
2. UnName PIP
[pg@h1 ~]$ psql gtlions -p 5432 -c "copy t3 to stdout"|psql gtlions -p 5432 -c "copy t4 from stdin"                                      
[pg@h1 ~]$ psql gtlions -p 5432 -c "copy t3 to stdout"|psql gtlions -p 5432 -c "copy t4 from stdin"  
[pg@h1 ~]$ psql gtlions -p 5432 -c "copy t3 to stdout"|psql gtlions -p 5432 -c "copy t4 from stdin"  
[pg@h1 ~]$ psql gtlions -p 5432 -c "copy t3 to stdout"|psql gtlions -p 5432 -c "copy t4 from stdin"  
[pg@h1 ~]$ psql gtlions -p 5432 -c "copy t3 to '/home/pg/syncpip'"|psql gtlions -p 5432 -c "copy t4 from '/home/pg/syncpip'"  
COPY 100
[pg@h1 ~]$ psql gtlions -ac "select 't3' tab,count(*) from t3 union all select 't4',count(*) from t4;"                        
select 't3' tab,count(*) from t3 union all select 't4',count(*) from t4;
 tab | count
-----+-------
 t3  |   100
 t4  |  1300
(2 rows)

-EOF-