MySQL gateway connection

Looks like plenty of folks here have similar problems getting the dg4odbc gateway working for MySQL. Hope someone that's tackled this can help me out.
Our configuration is such that we have our gateway machine separate from our Oracle database, and the MySQL machine is yet another server. We have installed and configured the gateway along with the unixODBC gateway and the MySQL connector. Running ./isql from the gateway successfully connects to the MySQL database and returns rows from specified tables.
Our difficulty is with setting up the listener.ora (on the gateway) and tnsnames.ora (on the Oracle host). Here are the contents of those files:
listenter.ora:
SID_LIST_LISTENER =
    (SID_DESC =
      (PROGRAM = dg4odbc)
      (ORACLE_HOME=/db01/app/oracle/product/gateways)
      (SID_NAME = myodbc3)
      (ENVS=LD_LIBRARY_PATH=/opt/unixODBC/lib:/opt/mysql/myodbc5/lib:/usr/local/lib:/db01/app/oracle/product/gateways/lib)
LISTENER =
(DESCRIPTION_LIST =
    (DESCRIPTION =
      (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1))
      (ADDRESS = (PROTOCOL = TCP)(HOST = gw_host)(PORT = 1521))
)tnsnames.ora:
dg4odbc =
(DESCRIPTION =
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = TCP)(HOST = gw_host)(PORT = 1521))
    (CONNECT_DATA = (SID= myodbc3))
    (HS=OK)
)Listener status on the gateway is:
-bash-3.00$ lsnrctl status
LSNRCTL for Solaris: Version 11.1.0.6.0 - Production on 26-APR-2010 15:07:08
Copyright (c) 1991, 2007, Oracle. All rights reserved.
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=IPC)(KEY=EXTPROC1)))
STATUS of the LISTENER
Alias                     LISTENER
Version                   TNSLSNR for Solaris: Version 11.1.0.6.0 - Production
Start Date                26-APR-2010 14:41:51
Uptime                    0 days 0 hr. 25 min. 17 sec
Trace Level               off
Security                  ON: Local OS Authentication
SNMP                      OFF
Listener Parameter File   /db01/app/oracle/product/gateways/network/admin/listener.ora
Listener Log File         /db01/app/oracle/diag/tnslsnr/ozone4/listener/alert/log.xml
Listening Endpoints Summary...
(DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=EXTPROC1)))
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=gw_host)(PORT=1521)))
Services Summary...
Service "myodbc3" has 1 instance(s).
Instance "myodbc3", status UNKNOWN, has 1 handler(s) for this service...
The command completed successfullyCan anyone see anything obvious in this configuration that's out of whack?
I logged into sqlplus and create a public database link:
SQL> create public database link mysql
2   connect to user_name identified by password
3 using 'dg4odbc';Executing a query via the link gives the following:
SQL> select * from block@mysql;
select * from block@mysql
ERROR at line 1:
ORA-28500: connection from ORACLE to a non-Oracle system returned this message:
ORA-02063: preceding line from MYSQLAnyone seen this before or have any ideas for me? I've read through the docs and this forum and just cannot see where the problem lies.
Earl
P.S. tnsping from the Oracle database to the gateway gives this:
merc@: tnsping dg4odbc
TNS Ping Utility for Linux: Version 10.2.0.4.0 - Production on 26-APR-2010 15:15:07
Copyright (c) 1997, 2007, Oracle. All rights reserved.
Used parameter files:
/opt/oracle/product/10.2.0/db_1/network/admin/sqlnet.ora
Used TNSNAMES adapter to resolve the alias
Attempting to contact (DESCRIPTION = (ADDRESS_LIST = (ADDRESS = (PROTOCOL = TCP)(HOST = gw_host)(PORT = 1521))) (CONNECT_DATA = (SID= myodbc3)) (HS=OK))
OK (0 msec)

>
Maybe it is sufficient to get the part where the libodbc.so library is loaded, so check where you'll find it in the strace file and provide this info until the error is visible in the traceHopefully this is what you wanted from truss.
23074/1:     stat("/opt/unixODBC/lib/libodbc.so", 0xFFFFFFFF7FFFD4A0) = 0
23074/1:     resolvepath("/opt/unixODBC/lib/libodbc.so", "/opt/unixODBC/lib/libodbc.so.1.0.0", 1023) = 34
23074/1:     open("/opt/unixODBC/lib/libodbc.so", O_RDONLY)     = 9
23074/1:     mmap(0x00100000, 32768, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_ALIGN, 9, 0) = 0xFFFFFFFF7A400000
23074/1:     mmap(0x00100000, 1826816, PROT_NONE, MAP_PRIVATE|MAP_NORESERVE|MAP_ANON|MAP_ALIGN, -1, 0) = 0xFFFFFFFF7A200000
23074/1:     mmap(0xFFFFFFFF7A200000, 719355, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_TEXT, 9, 0) = 0xFFFFFFFF7A200000
23074/1:     mmap(0xFFFFFFFF7A3AE000, 55864, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_INITDATA, 9, 712704) = 0xFFFFFFFF7A3AE000
23074/1:     mmap(0xFFFFFFFF7A3BC000, 1552, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE|MAP_FIXED|MAP_ANON, -1, 0) = 0xFFFFFFFF7A3BC000
23074/1:     munmap(0xFFFFFFFF7A2B0000, 1040384)          = 0
23074/1:     memcntl(0xFFFFFFFF7A200000, 75448, MC_ADVISE, MADV_WILLNEED, 0, 0) = 0
23074/1:     close(9)                         = 0
23074/1:     stat("/opt/unixODBC/lib/libdl.so.1", 0xFFFFFFFF7FFFD230) Err#2 ENOENT
23074/1:     stat("/opt/mysql/myodbc5/lib/libdl.so.1", 0xFFFFFFFF7FFFD230) Err#2 ENOENT
23074/1:     stat("/usr/local/lib/libdl.so.1", 0xFFFFFFFF7FFFD230) Err#2 ENOENT
23074/1:     stat("/db01/app/oracle/product/gateways/lib/libdl.so.1", 0xFFFFFFFF7FFFD230) Err#2 ENOENT
23074/1:     stat("/opt/unixODBC/lib/libthread.so.1", 0xFFFFFFFF7FFFD230) Err#2 ENOENT
23074/1:     stat("/opt/mysql/myodbc5/lib/libthread.so.1", 0xFFFFFFFF7FFFD230) Err#2 ENOENT
23074/1:     stat("/usr/local/lib/libthread.so.1", 0xFFFFFFFF7FFFD230) Err#2 ENOENT
23074/1:     stat("/db01/app/oracle/product/gateways/lib/libthread.so.1", 0xFFFFFFFF7FFFD230) Err#2 ENOENT
23074/1:     stat("/opt/unixODBC/lib/libc.so.1", 0xFFFFFFFF7FFFD230) Err#2 ENOENT
23074/1:     stat("/opt/mysql/myodbc5/lib/libc.so.1", 0xFFFFFFFF7FFFD230) Err#2 ENOENT
23074/1:     stat("/usr/local/lib/libc.so.1", 0xFFFFFFFF7FFFD230) Err#2 ENOENT
23074/1:     stat("/db01/app/oracle/product/gateways/lib/libc.so.1", 0xFFFFFFFF7FFFD230) Err#2 ENOENT
23074/1:     stat("/opt/unixODBC/lib/libgcc_s.so.1", 0xFFFFFFFF7FFFD230) Err#2 ENOENT
23074/1:     stat("/opt/mysql/myodbc5/lib/libgcc_s.so.1", 0xFFFFFFFF7FFFD230) Err#2 ENOENT
23074/1:     stat("/usr/local/lib/libgcc_s.so.1", 0xFFFFFFFF7FFFD230) = 0
23074/1:     resolvepath("/usr/local/lib/libgcc_s.so.1", "/usr/local/lib/libgcc_s.so.1", 1023) = 28
23074/1:     open("/usr/local/lib/libgcc_s.so.1", O_RDONLY)     = 9
23074/1:     mmap(0xFFFFFFFF7A400000, 32768, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_FIXED, 9, 0) = 0xFFFFFFFF7A400000
23074/1:     close(9)                         = 0
23074/1:     stat("/db01/app/oracle/product/gateways/lib/libgcc_s.so.1", 0xFFFFFFFF7FFFD230) Err#2 ENOENT
23074/1:     stat("/lib/64/libgcc_s.so.1", 0xFFFFFFFF7FFFD230) Err#2 ENOENT
23074/1:     stat("/usr/lib/64/libgcc_s.so.1", 0xFFFFFFFF7FFFD230) Err#2 ENOENT
23074/1:     munmap(0xFFFFFFFF7A200000, 719355)          = 0
23074/1:     munmap(0xFFFFFFFF7A3AE000, 58892)          = 0
23074/1:     munmap(0xFFFFFFFF7A400000, 32768)          = 0
23074/1:     write(7, "   h o a e r r : 2 8 5 0".., 14)     = 14
23074/1:     time()                              = 1273255397
23074/1:     write(7, " E x i t i n g   h g o l".., 40)     = 40
23074/1:     write(7, " F a i l e d   t o   l o".., 81)     = 81
23074/1:     time()                              = 1273255397
23074/1:     write(7, " E x i t i n g   h g o l".., 49)     = 49
23074/1:     time()                              = 1273255397
23074/1:     write(7, " E x i t i n g   h g o i".., 126)     = 126
23074/1:     getpid()                         = 23074 [5550]
23074/1:     open("/proc/23074/map", O_RDONLY)          = 9
23074/1:     fstat(9, 0xFFFFFFFF7FFFD1F8)               = 0
23074/1:     open("/dev/zero", O_RDWR)               = 12
23074/1:     mmap(0x00000000, 14872, PROT_READ|PROT_WRITE, MAP_PRIVATE, 12, 0) = 0xFFFFFFFF7AC00000
23074/1:     pread(9, "\0\0\001\0\0\0\0\0\0\0\0".., 14872, 0) = 7488
23074/1:     close(9)                         = 0
23074/1:     munmap(0xFFFFFFFF7AC00000, 7592)          = 0
23074/1:     write(7, " h o s t m s t r :      ".., 41)     = 41
23074/1:     write(14, "\0 *\0\006\0\0\0\0\080\0".., 42)     = 42
23074/1:     read(14, "\0 n\0\006\0\0\0\0\0 H\0".., 8208)     = 110
23074/1:     getpid()                         = 23074 [5550]
23074/1:     open("/proc/23074/map", O_RDONLY)          = 9
23074/1:     fstat(9, 0xFFFFFFFF7FFFD4D8)               = 0
23074/1:     open("/dev/zero", O_RDWR)               = 13
23074/1:     mmap(0x00000000, 15080, PROT_READ|PROT_WRITE, MAP_PRIVATE, 13, 0) = 0xFFFFFFFF7A400000
23074/1:     pread(9, "\0\0\001\0\0\0\0\0\0\0\0".., 15080, 0) = 7592
23074/1:     close(9)                         = 0
23074/1:     munmap(0xFFFFFFFF7A400000, 7696)          = 0
23074/1:     write(7, " h o s t m s t r :      ".., 44)     = 44
23074/1:     getpid()                         = 23074 [5550]
23074/1:     open("/proc/23074/map", O_RDONLY)          = 9
23074/1:     fstat(9, 0xFFFFFFFF7FFFD358)               = 0
23074/1:     open("/dev/zero", O_RDWR)               = 15
23074/1:     mmap(0x00000000, 15288, PROT_READ|PROT_WRITE, MAP_PRIVATE, 15, 0) = 0xFFFFFFFF7A300000
23074/1:     pread(9, "\0\0\001\0\0\0\0\0\0\0\0".., 15288, 0) = 7696
23074/1:     close(9)                         = 0There appear to be errors there but I have no idea how to read this output. Thanks again for your help.
Earl

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I have following code:
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
public class JdbcExample2 {
public static void main(String args[]) {
    Connection con = null;
    try {
      Class.forName("com.mysql.jdbc.Driver").newInstance();
      //jdbc:mysql://host_name:port/dbname
//     con = DriverManager.getConnection("jdbc:MySQL:///test","admin", "admin");
      con = DriverManager.getConnection("jdbc:MySQL://localhost:3306/test","admin", "admin");
      if(!con.isClosed())
        System.out.println("Successfully connected to " +
          "MySQL server using TCP/IP...");
    } catch(Exception e) {
      System.err.println("Exception: " + e.getMessage());
    } finally {
      try {
        if(con != null)
          con.close();
      } catch(SQLException e) {}
}But when I run , I got following error:
Exception: com.mysql.jdbc.Driver
My question is:
[1]. when I connect to MySQL Server through mySQL Client, I got
Enter password: *****
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 18 to server version: 4.1.21-community-nt
Type 'help;' or '\h' for help. Type '\c' to clear the buffer.
mysql>
how Can I determine MySQL Server name?? I forgot when I install, maybe MySQL is my SQL Server name
[2]. Do I need to creat a user DSN name or System DSN name for MySQL Server?? which one is best??
How to do it??
[3]. How to make above simple JDBC program runnable??
Thanks
sunny
Message was edited by:
sunnymanman

Thanks, see new errors:
C:\Project\java>java Jdbc11
Copyright 2004, R.G.Baldwin
java.sql.SQLException: Access denied for user 'admin'@'localhost' (using password: YES)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:946)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:2941)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:868)
at com.mysql.jdbc.MysqlIO.secureAuth411(MysqlIO.java:3340)
at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:1238)
at com.mysql.jdbc.Connection.createNewIO(Connection.java:2743)
at com.mysql.jdbc.Connection.<init>(Connection.java:1553)
at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:266)
at java.sql.DriverManager.getConnection(DriverManager.java:512)
at java.sql.DriverManager.getConnection(DriverManager.java:171)
at Jdbc11.main(Jdbc11.java:23)
C:\Project\java>
any idea??
here Jdbc11.java:23 is:
Connection con = DriverManager.getConnection(
url,"admin", "YES");
my userID/Password = admin/admin;
sunny
Message was edited by:
sunnymanman

Conecting to mysql database Connection reset by peer

hi guys,
I have to connec to sever where , from this place i need to contact a remote database , the databse is behind a firewall , they database in their intranet ,they have give me a valid ip , they have a conection between the valid ip and the intranet system , they give me access to the port in the fire wall , i asked for the port 3306 (mysql default ) port , and tried connecting it but i get exception, should i need to get the 80 port for connection??? please help
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yeahman i feel the same, but i need to prove them they need to do some work , for that i should show thm its not my problem , can u tell me how the jdbc connector works,or any other way telling them , the port not opened still , how will the server pass the request to the database , some one please help me

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While accessing the lead questionaires for IC Win client..
I get the error message as follows
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Can u share with me as how to establish the SAP gateway connection ..
I am grateful for your help..
I woul like to thank and appreciate you by rewarding the points
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While accessing the lead questionaires for IC Win client..
I get the error message as follows
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Can u share with me as how to establish the SAP gateway connection ..
I am grateful for your help..
I woul like to thank and appreciate you by rewarding the points
Thanks and Regards,
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Oracle 11gR2
RHEL 6.4
Has anyone use the Oracle ODBC Gateway to connect to another Oracle database? Any issues with that configuration? Where do I get the ODBC drivers for Linux?
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Hi,
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I have never had to open more than one MySQL database from within the same website before, but I do now. The website I have is designed where all the content comes from within the main database. I am building an Inventory system that I want within it's own database, in the event I would ever need to move the application to another server or something, I don't want this data residing in the main database.
Currently, I open the database connection from within a file called "common.php" that resides in a directory called "lib" that can be accessed from the root directory. Below is the proposed code that would be placed within the "common.php" file:
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$dbpass = array('P@ssw0rd', 'P@ssw0rd2');
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function connectdb2($dbserver, $dbuser, $dbpass, $dbname) {
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global $connection2;
$connection2 = @mysql_connect($dbserver, $dbuser, $dbpass) or die ("could not connect to server");
$db2 = @mysql_select_db($dbname, $connection2) or die ("could not select databsase");
return $connection2;
//End of Code Within the "common.php"
From within any page of the website, I want to access both connections by placing an include at the top of each page:
include_once("lib/common.php");
Currently, when I run the code above, any page within the website (the home page) provides error messages with regards to database connectivity (the pages are looking for there content from within the second database. It's as if the second database is the only database seen by the website.
I need help figuring out how I can have two MySQL databases open at the same time (the second database will only be open for short periods of time and then closed). But the main database is always open.

Create one project using one copy of the exact tables.
create 2 different sessions.xml files each pointing to the same project. Set the login information in the sessions.xml files.
That should work fine.
Peter

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