2026-03-12 20:23:15

idev/mts_shared_server_statistics.sql

@@ -0,0 +1,89 @@
+-- +----------------------------------------------------------------------------+
+-- |                          Jeffrey M. Hunter                                 |
+-- |                      jhunter@idevelopment.info                             |
+-- |                         www.idevelopment.info                              |
+-- |----------------------------------------------------------------------------|
+-- |      Copyright (c) 1998-2012 Jeffrey M. Hunter. All rights reserved.       |
+-- |----------------------------------------------------------------------------|
+-- | DATABASE : Oracle                                                          |
+-- | FILE     : mts_shared_server_statistics.sql                                |
+-- | CLASS    : Multi-threaded Server (MTS)                                     |
+-- | PURPOSE  : Display status and metrics related to MTS shared server         |
+-- |            statistics.                                                     |
+-- |                                                                            |
+-- |            SERVERS_STARTED    : The number of shared server processes      |
+-- |                                 started as the instance adjusts the number |
+-- |                                 of shared processes up and down from the   |
+-- |                                 initial value specified by the MTS_SERVERS |
+-- |                                 parameter. When the instance starts, and   |
+-- |                                 after the initial number of shared server  |
+-- |                                 processes processes specified by           |
+-- |                                 MTS_SERVERS has been started, this value   |
+-- |                                 is set to 0. From that point on, this      |
+-- |                                 value is incremented whenever a new shared |
+-- |                                 server process is started.                 |
+-- |            SERVERS_TERMINATED : A count of the total number of shared      |
+-- |                                 server processes that have been terminated |
+-- |                                 since the instance was started.            |
+-- |            SERVERS_HIGHWATER  : The maximum number of shared server        |
+-- |                                 processes that have ever been running at   |
+-- |                                 one moment in time.                        |
+-- |                                                                            |
+-- |            NOTES: If the SERVERS_HIGHWATER value matches, the instance's   |
+-- |                   MTS_MAX_SERVERS value, then you might realize a          |
+-- |                   performance benefit from increasing MTS_MAX_SERVERS. If  |
+-- |                   the counts for SERVERS_STARTED and SERVERS_TERMINATED    |
+-- |                   keep climbing, then you should consider raising          |
+-- |                   MTS_SERVERS. Raising the minimum number of shared server |
+-- |                   processes should reduce the number that are deleted only |
+-- |                   to be recreated later.                                   |
+-- |                                                                            |
+-- |            This script is RAC enabled.                                     |
+-- |                                                                            |
+-- | NOTE     : As with any code, ensure to test this script in a development   |
+-- |            environment before attempting to run it in production.          |
+-- +----------------------------------------------------------------------------+
+
+SET TERMOUT OFF;
+COLUMN current_instance NEW_VALUE current_instance NOPRINT;
+SELECT rpad(instance_name, 17) current_instance FROM v$instance;
+SET TERMOUT ON;
+
+PROMPT 
+PROMPT +------------------------------------------------------------------------+
+PROMPT | Report   : Multi-threaded Server: Shared Server Statistics             |
+PROMPT | Instance : &current_instance                                           |
+PROMPT +------------------------------------------------------------------------+
+
+SET ECHO        OFF
+SET FEEDBACK    6
+SET HEADING     ON
+SET LINESIZE    180
+SET PAGESIZE    50000
+SET TERMOUT     ON
+SET TIMING      OFF
+SET TRIMOUT     ON
+SET TRIMSPOOL   ON
+SET VERIFY      OFF
+
+CLEAR COLUMNS
+CLEAR BREAKS
+CLEAR COMPUTES
+
+COLUMN instance_name        FORMAT a10              HEAD 'Instance'
+COLUMN servers_started      FORMAT 999,999,999      HEAD 'Servers Started'
+COLUMN servers_terminated   FORMAT 999,999,999      HEAD 'Servers Terminated'
+COLUMN servers_highwater    FORMAT 999,999,999      HEAD 'Servers Highwater'
+
+SELECT
+    i.instance_name           instance_name
+  , s.servers_started         servers_started
+  , s.servers_terminated      servers_terminated
+  , s.servers_highwater       servers_highwater
+FROM
+    gv$instance i
+  , gv$shared_server_monitor s
+WHERE
+    i.inst_id = s.inst_id
+ORDER BY
+    i.instance_name;