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Date: Mon, 03 Mar 2003 13:24:17 -0800
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From: "Sam Bootsma" <sbootsma@gbrownc.on.ca>
Subject: ORA-00018: maximum number of sessions exceeded
Organization: Fat City Network Services, San Diego, California
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We are running Oracle 7.3.4.5.0 on an IBM/AIX RISC System/6000: Version
2.3.4.0.0. =20

=20

This afternoon, our users started getting the error message "ORA-00018:
maximum number of sessions exceeded."  As time went on, the number of
sessions was decreasing (as shown by the count of rows in v$session).
However, Oracle still did not allow connections.  This lasted for about
40 minutes. =20

=20

The sessions parameter in the initialization parameter file showed 300.

=20

Querying v$session showed 246 rows.

=20

Querying v$license reported:

SQL> select * from v$license;

=20

SESSIONS_MAX SESSIONS_WARNING SESSIONS_CURRENT SESSIONS_HIGHWATER
USERS_MAX

------------ ---------------- ---------------- ------------------
---------

           0                0              204                248
0

=20

There seems to be a contradiction here:  300 sessions in init.ora;
sessions_highwater at 248, and Oracle not allowing connections because
the maximum has been reached.

=20

Has anybody encountered this problem before.  Is there a "simple" reason
for this erratic behavior? =20

=20

Management is looking for an answer as to why this has happened.  Thanks
for any input!

=20

Sam Bootsma

sbootsma@gbrownc.on.ca

=20


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<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>We are running Oracle 7.3.4.5.0 on an IBM/AIX RISC
System/6000: Version 2.3.4.0.0.&nbsp; </span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>&nbsp;</span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>This afternoon, our users started getting the error =
message &#8220;ORA-00018:
maximum number of sessions exceeded.&#8221;&nbsp; As time went on, the =
number
of sessions was decreasing (as shown by the count of rows in =
v$session).&nbsp;
However, Oracle still did not allow connections.&nbsp; This lasted for =
about 40
minutes.&nbsp; </span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>&nbsp;</span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>The sessions parameter in the initialization =
parameter file
showed 300.</span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>&nbsp;</span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>Querying v$session showed 246 rows.</span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>&nbsp;</span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>Querying v$license reported:</span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>SQL&gt; select * from v$license;</span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>&nbsp;</span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>SESSIONS_MAX SESSIONS_WARNING SESSIONS_CURRENT
SESSIONS_HIGHWATER USERS_MAX</span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>------------ ---------------- ----------------
------------------ ---------</span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;
0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;
0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;
204&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;
&nbsp;&nbsp;248&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
0</span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>&nbsp;</span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>There seems to be a contradiction here:&nbsp; 300 =
sessions
in init.ora; sessions_highwater at 248, and Oracle not allowing =
connections because
the maximum has been reached.</span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>&nbsp;</span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>Has anybody encountered this problem before.&nbsp; Is =
there
a &#8220;simple&#8221; reason for this erratic behavior?&nbsp; =
</span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>&nbsp;</span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>Management is looking for an answer as to why this =
has
happened.&nbsp; Thanks for any input!</span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>&nbsp;</span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'>Sam Bootsma</span></font></p>

<p class=3DMsoNormal><font size=3D2 face=3DArial><span =
style=3D'font-size:10.0pt;
font-family:Arial'><a =
href=3D"mailto:sbootsma@gbrownc.on.ca">sbootsma@gbrownc.on.ca</a></span><=
/font></p>

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style=3D'font-size:
12.0pt'>&nbsp;</span></font></p>

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=00
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