RE: After 256 connections : ORA-12154

From: Sami <saminathans_at_myrealbox.com>
Date: Tue, 16 Dec 2003 17:29:33 -0800
Message-ID: <F001.005DA1DE.20031216172933@fatcity.com>

Raj, Thanks for the info..

Process limit is set to 7000
Yes our OS is Sun Solaris

-----Original Message-----
Jamadagni, Rajendra
Sent: Tuesday, December 16, 2003 2:54 PM To: Multiple recipients of list ORACLE-L

What is the setting for processes in the database? What is your per-process-file descriptor limit?

If you are on Solaris following may apply to you ...

Problem Description

You have a JDBC program connecting to the database. This program may run standalone
or on a webserver. This program opens many simultaneous connections to the database.
The following error occurs on or near the 257th connection: java.sql.SQLException: ORA-12154: TNS:could not resolve service name All of the following symptoms apply:
- Solaris OS

Oracle JDBC/OCI driver
ORA-12154 Error
Failure occurs on 257th connection between JDBC client and Oracle server.
Same program works on a non-Solaris OS, exceeding the 257th connection. Solution Description
This is a known Solaris bug (1084772). Contact Sun for further information and/or possible patch. As a workaround, you can hardcode the full tns description in the JDBC/OCI connection string. This avoids the need to read the tnsnames.ora file. This will not eliminate the problem, but should free up more file descriptors for your use, thus deferring failure until later. jdbc:oracle:oci8:@(description=(address=(host=pepper)(protocol=tcp)(port=152 1))(connect_data=(sid=ORCL))) Explanation
The OS file descriptor limit is being reached. Thus, the tnsnames.ora file cannot be read to resolve the tns alias suppled to the connection string. References
http://sunsolve.sun.com bug (1084772) Summary: Although the limit for file descriptors is 1024, you cannot open more than 256 fd's using stdio.h. (This is not an Oracle bug.) note:94091.1 Example: Identifying Connection String Problems in JDBC bug:777647 When Opening > 253 File Descriptors and Then Connection bug:2060739 ORA-12154 After Creating 220+ Connections Using Thick (OCI8) JDBC Driver

</solaris only>

Raj

Rajendra dot Jamadagni at nospamespn dot com All Views expressed in this email are strictly personal. QOTD: Any clod can have facts, having an opinion is an art !

-----Original Message-----
Sent: Tuesday, December 16, 2003 2:39 PM To: Multiple recipients of list ORACLE-L

Dear Gurus,

We are getting the following error if we try to create more than 256 connections from the same client. The problem is easily reproducible bt writing simple java program and keep creating connections(do not close it).

Did anyone encounter this kind of issue and how did you solve it?

Exception in thread "main" java.sql.SQLException: ORA-12154: TNS:could not resolve service name

        at java.lang.Throwable.fillInStackTrace(Native Method)
        at java.lang.Throwable.fillInStackTrace(Compiled Code)
        at java.lang.Throwable.<init>(Compiled Code)
        at java.lang.Exception.<init>(Compiled Code)
        at java.sql.SQLException.<init>(SQLException.java:43)
        at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:168)
        at oracle.jdbc.oci8.OCIDBAccess.check_error(Compiled Code)
        at oracle.jdbc.oci8.OCIDBAccess.logon(Compiled Code)
        at oracle.jdbc.driver.OracleConnection.<init>(Compiled Code)
        at oracle.jdbc.driver.OracleDriver.getConnectionInstance(Compiled
Code)
        at oracle.jdbc.driver.OracleDriver.connect(Compiled Code)
        at java.sql.DriverManager.getConnection(Compiled Code)
        at java.sql.DriverManager.getConnection(Compiled Code)
        at j1.main(Compiled Code)

Thanks in advance

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Author: Jamadagni, Rajendra
  INET: Rajendra.Jamadagni_at_espn.com

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Author: Sami
  INET: saminathans_at_myrealbox.com

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Received on Tue Dec 16 2003 - 19:29:33 CST