How to check the maximum number of allowed connections to an Oracle database

Question

What s the best way  using SQL  to check the maximum number of connections that is allowed for an Oracle database  In the end  I would like to show the current number of sessions and the total number allowed  e g   Currently  23 out of 80 connections are used

User · Answer

I thought this would work  based on this source   SELECT    Currently           SELECT COUNT    FROM V SESSION         out of         DECODE VL SESSIONS MAX 0  unlimited  VL SESSIONS MAX          connections are used   AS USAGE MESSAGE FROM    V LICENSE VL   However  Justin Cave is right   This query gives better results   SELECT    Currently           SELECT COUNT    FROM V SESSION         out of         VP VALUE         connections are used   AS USAGE MESSAGE FROM    V PARAMETER VP WHERE VP NAME    sessions

User · Answer

There are a few different limits that might come in to play in determining the number of connections an Oracle database supports   The simplest approach would be to use the SESSIONS parameter and V SESSION  i e   The number of sessions the database was configured to allow  SELECT name  value    FROM v parameter  WHERE name    sessions    The number of sessions currently active  SELECT COUNT      FROM v session   As I said  though  there are other potential limits both at the database level and at the operating system level and depending on whether shared server has been configured   If shared server is ignored  you may well hit the limit of the PROCESSES parameter before you hit the limit of the SESSIONS parameter   And you may hit operating system limits because each session requires a certain amount of RAM

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The sessions parameter is derived from the processes parameter and changes accordingly  when you change the number of max processes  See the Oracle docs for further info   To get only the info about the sessions       select current utilization  limit value      from v resource limit      where resource name  sessions      CURRENT UTILIZATION LIMIT VALUE ------------------- -----------                 110         792   Try this to show info about both       select resource name  current utilization  max utilization  limit value      from v resource limit      where resource name in   sessions    processes       RESOURCE NAME CURRENT UTILIZATION MAX UTILIZATION LIMIT VALUE ------------- ------------------- --------------- ----------- processes                      96             309         500 sessions                      104             323         792

User · Answer

Use gv session for RAC  if you want get the total number of session across the cluster

User · Answer

v resource limit view is so interesting for me in order to glance oracle sessions processes     https   bbdd-error blogspot com es 2017 09 check-sessions-and-processes-limit-in html

User · Answer

select count    sum decode status   ACTIVE  1 0   from v session where type   USER

User · Answer

Note  this only answers part of the question   If you just want to know the maximum number of sessions allowed  then you can execute in sqlplus  as sysdba   SQL gt  show parameter sessions   This gives you an output like       NAME                                 TYPE        VALUE ------------------------------------ ----------- ------------------------------ java max sessionspace size           integer     0 java soft sessionspace limit         integer     0 license max sessions                 integer     0 license sessions warning             integer     0 sessions                             integer     248 shared server sessions               integer   The sessions parameter is the one what you want

[sql] How to check the maximum number of allowed connections to an Oracle database?

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