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OS Results From PostgreSQL


Hi ,

As of now, we are using "\i" or using "PL/SH" script for getting the OS command results from PostgreSQL. However, below is the one more option where we can get the required info.

Step 1
======
#include "postgres.h"
#include "fmgr.h"
#include <string.h>
#include <unistd.h>
#ifdef PG_MODULE_MAGIC
PG_MODULE_MAGIC;
#endif

PG_FUNCTION_INFO_V1(shell_exec);
Datum
shell_exec(PG_FUNCTION_ARGS)
{
    text  *arg1 = PG_GETARG_TEXT_P(0);
    char  *Command=VARDATA(arg1);
    int32 result=system(Command);   
    PG_RETURN_TEXT_P(result);
}

Step 2
=======
-bash-3.2$ more Makefile
PG_CONFIG = /opt/PostgresPlus/9.0AS/bin/pg_config
MODULES = shell_exec
PGXS := $(shell $(PG_CONFIG) --pgxs)
include $(PGXS)

Step 3
======
make and .so file to $PGHOME/lib  or $PGHOME/lib/postgres/

Step 4
======
postgres=# CREATE OR REPLACE FUNCTION shell_exec(text) RETURNS int                           AS 'shell_exec.so', 'shell_exec'  
LANGUAGE C STRICT;
CREATE FUNCTION

Step 5
======
postgres=# select shell_exec('vmstat 1 >/opt/PostgreSQL/9.0/data/output');
^CCancel request sent
postgres=# select pg_read_file('/opt/PostgreSQL/9.0/data/output',1,1000000);
                                       pg_read_file                                      
------------------------------------------------------------------------------------------
 rocs -----------memory---------- ---swap-- -----io---- --system-- -----cpu-----         +
  r  b   swpd   free   buff  cache   si   so    bi    bo   in   cs us sy id wa st        +
  0  0 2653376 654888  31832 248464    6   14    28   220    8   12  4  5 89  1  0       +
  0  0 2653376 654988  31832 248468    0    0     0    40  693 1310  0  1 99  0  0       +
  1  0 2653376 654856  31840 248468    0    0     0   116  704 1348  0  1 99  0  0       +
  0  0 2653376 654608  31840 248472    0    0     0     0  664 1494  0  1 100  0  0      +
  0  0 2653376 654740  31840 248472    0    0     0     0  631 1522  0  1 99  0  0       +
  0  0 2653376 654732  31840 248476    0    0     0     0  674 1519  0  1 99  0  0       +
  0  0 2653376 654756  31840 248476    0    0     0   156  616 1541  0  1 100  0  0      +
  0  0 2653376 654748  31848 248480    0    0     0    72  620 1331  0  1 99  0  0       +
  0  0 2653376 654748  31848 248480    0    0     0     0  599 1299  0  0 99  0  0       +
  0  0 2653376 654740  31848 248484    0    0     0     0  630 1292  0  1 99  0  0       +
  0  0 2653376 654972  31848 248484    0    0     0    32  664 1358  0  1 99  0
0       +

దినేష్ కుమార్
Dinesh Kumar

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