Обсуждение: How to know server status variable in postgresql?

Hai, I am developing a java application for performance counter. For that i
want to collect all server status counter names with current value. i just
did it for MySQl by, *"SHOW GLOBAL STATUS"*. is their any query similar this
to collect those details from the database. I am new to postgresql, so i
dont know about it well. So if you know help me friends.

Thanks in advance



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On 1/7/2014 4:33 AM, ambilalmca wrote:
> Hai, I am developing a java application for performance counter. For that i
> want to collect all server status counter names with current value. i just
> did it for MySQl by, *"SHOW GLOBAL STATUS"*. is their any query similar this
> to collect those details from the database. I am new to postgresql, so i
> dont know about it well. So if you know help me friends.

there's no such single source for 'all server status counters'. there's
a whole pile of different pg_catalog.pg_stat_*** tables with different
sorts of information, for each database.

the best script I've seen for pulling monitoring data out of postgres is
check_postgres from the Bucardo folks, this is designed to work with a
Nagios/Cacti type monitoring system.... its actually a perl script, you
run it repeatedly giving it specific things you want to look at (for
instance, size and name of largest tables, or total database size, or
number of active connections, etcetcetc).



--
john r pierce                                      37N 122W
somewhere on the middle of the left coast

I want to collect,

*Connections. *

Current connections. The number of currently open connections.
Connections executing requests. The number of currently open connections
that are executing requests.
Idle connections. The number of currently idle connections.
Max connections. The maximum number of concurrent connections to the
database server.
Used connections. Connections used as a percentage of maximum connections.

*Buffers. *

Shared buffers size. Current size of shared buffers.
Disk cache size. Current size of disk cache buffer.
Sort buffer size. Current size of sort buffer.
Work buffer size. Current size of working requests buffer.
Temp buffer size. Current size of temporary buffer.

*IO Requests.*

Blocks read. Number of blocks directly read on disk.
For optimal performance this value should be the smallest possible. If the
database has to execute too many disk accesses, performance will suffer.
Index blocks read. Number of index blocks directly read on disk.
% Index blocks read. Percentage of index blocks directly read on disk.
Sequence blocks read. Number of sequence blocks directly read on disk.

*Cache*
Blocks read. Number of cached blocks read.
Index blocks read. Number of cached index blocks read.
% Index blocks read. Percentage of cached index blocks read.
For optimal performance, this value must be as large as possible. If an
insufficient number of index blocks are declared in the table, it could
negatively impact the database server performance.
Sequence blocks read. Number of cached sequence blocks read.

*Index*.

Index read. Number of reads initiated by an index.
Indexed rows read. Number of rows read by indexed requests.
Indexed rows fetched. Number of live rows fetched by indexed requests.

*Command Rates.*

Rows read. Number of rows read.
Rows fetched. Number of rows fetched.
Inserted rows. Number of rows inserted.
Updated rows. Number of rows updated.
Deleted rows. Number of rows deleted.
Committed transactions. Number of committed transactions.
This value should be relatively stable, indicating that there are no
performance-reducing load peaks. If applications do not commit often enough,
it will lead to an overload on the database server.
Rolled back transactions. Number of transactions rolled back.
% Rolledback transactions. Percentage of transactions rolled back.

*Locks. *

Locks waiting. Number of locks waiting.
Locks held. Number of locks held.
Process holding locks. Number of processes holding locks.

how to collect these details by using query. now i find queries for
sonnections. but i dont know anout others. please help me.@Sameer Kumar



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@ sameer khan, i got query for all except *Number of cached blocks read,
Number of cached index blocks read, Number of cached sequence blocks read*.
can you tell query for these three counters only?



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On Wed, Jan 15, 2014 at 7:36 AM, ambilalmca <ambilalmca@gmail.com> wrote:
> can you tell me the full query for that? because in pg_stat_all_tables contains many fields. i dont know whats the
correctone to get the result. 

>>>> *Number of cached blocks read,

>>>> Number of cached index blocks read,

They're in pg_statio_all_tables, it's all documented at:
http://www.postgresql.org/docs/current/static/monitoring-stats.html

Regards,
Marti