Re: [GENERAL] is max connections in a database table somewhere

2011-08-11 Thread Geoffrey Myers 

Greg Smith wrote:

On 08/10/2011 02:46 PM, Geoffrey Myers wrote:

Is the max connections value in a system table somewhere?


If you intend to do anything with the value you probably want one of 
these forms:


SELECT CAST(current_setting('max_connections') AS integer);
SELECT CAST(setting AS integer) FROM pg_settings WHERE 
name='max_connections';


The setting comes back as a text field when using current_setting on the 
pg_settings view (which isn't a real table, under the hood it's calling 
a system function)


Actually, just pulling it out of the database to display it in a report.


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Re: [GENERAL] is max connections in a database table somewhere

2011-08-11 Thread Diego Augusto Molina 
2011/8/10, Greg Smith :
> On 08/10/2011 02:46 PM, Geoffrey Myers wrote:
>> Is the max connections value in a system table somewhere?

Yes, it is in the table "pg_catalog.pg_database". The column is named
"datconnlimit" and is of type "int4". See this:
http://www.postgresql.org/docs/9.0/interactive/catalog-pg-database.html.

But this would be the appropiate way of getting the value:
> SELECT CAST(current_setting('max_connections') AS integer);

You would rather use that form instead of messing up with the catalogs.
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Re: [GENERAL] is max connections in a database table somewhere

2011-08-10 Thread Greg Smith 

On 08/10/2011 02:46 PM, Geoffrey Myers wrote:

Is the max connections value in a system table somewhere?


If you intend to do anything with the value you probably want one of 
these forms:


SELECT CAST(current_setting('max_connections') AS integer);
SELECT CAST(setting AS integer) FROM pg_settings WHERE 
name='max_connections';


The setting comes back as a text field when using current_setting on the 
pg_settings view (which isn't a real table, under the hood it's calling 
a system function)


--
Greg Smith   2ndQuadrant USg...@2ndquadrant.com   Baltimore, MD
PostgreSQL Training, Services, and 24x7 Support  www.2ndQuadrant.us


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