RE: Tomcat reconnect to database server?
Actually, I am correct that the Microsoft SQL Server JDBC driver does not support a validationQuery option. However, I agree that I was incorrect in assuming that the resource parameters configured the JDBC driver, rather than the connection pool (and the JDBC driver indirectly). I'm glad that you corrected my mistake. Fortunately, one thing that I've learned from using mailing lists is that there's no better way to get someone to give you the right answer than to suggest the wrong one! Derek -Original Message- From: Altankov Peter [mailto:[EMAIL PROTECTED] Sent: January 8, 2004 7:24 AM To: Derek Mahar Subject: RE: Tomcat reconnect to database server? I think u r just wrong. We are not talking bout the JDBC driver itself but for the apache DBCP and POOL implementations. And THAT dbpool package supports the option of validation query -Original Message- From: Derek Mahar [mailto:[EMAIL PROTECTED] Sent: 07 2004 . 20:41 To: Altankov Peter Subject: RE: Tomcat reconnect to database server? Thanks for the suggestion. After reading the MS SQL Server JDBC driver documentation, however, it appears that the driver does not support the validationQuery option. :-( Derek -Original Message- From: Altankov Peter [mailto:[EMAIL PROTECTED] Sent: January 7, 2004 11:38 AM To: Tomcat Users List Subject: RE: Tomcat reconnect to database server? The DBCP pool that you lookup from JNDI is already such a connection manager. Just try adding the validation query that Arthur suggested. Im not sure for MSSQL but I use this for Oracle: parameter namevalidationQuery/name valueSELECT 1 FROM dual/value /parameter This goes underResourceParams name=jdbc/your_resource BR -Original Message- From: Derek Mahar [mailto:[EMAIL PROTECTED] Sent: 07 2004 . 18:21 To: Tomcat Users List Subject: RE: Tomcat reconnect to database server? Thanks for your reply. Unfortunately, the Microsoft SQL Server JDBC driver does not support an autoreconnect option. Do I need a separate connection pool manager? The MS SQL Server JDBC driver documentation suggests that I might need such a manager since the driver does not itself manage the connection pool. Derek -Original Message- From: Philipp Taprogge [mailto:[EMAIL PROTECTED] Sent: January 7, 2004 9:47 AM To: Tomcat Users List Subject: Re: Tomcat reconnect to database server? Hi! I don't know MSSQL in particular, but in princible it should be as simple as adding ?autoreconnect=true to the driver URL. Phil Derek Mahar wrote: How can I configure Tomcat 5.0.16 to reconnect to a Microsot SQL Server after a server restart? I have configured Tomcat to use JNDI datasources (through Resource and ResourceParam elements within GlobalNamingResources). I presume that at startup, Tomcat connects to the server and creates a pool of connections for later use. However, when we restart our server, Tomcat loses its connection(s) and does not re-establish these connections. -- And on the seventh day, He exited from append mode. (Book of create(2), line 255) - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Tomcat reconnect to database server?
Hi! I don't know MSSQL in particular, but in princible it should be as simple as adding ?autoreconnect=true to the driver URL. Phil Derek Mahar wrote: How can I configure Tomcat 5.0.16 to reconnect to a Microsot SQL Server after a server restart? I have configured Tomcat to use JNDI datasources (through Resource and ResourceParam elements within GlobalNamingResources). I presume that at startup, Tomcat connects to the server and creates a pool of connections for later use. However, when we restart our server, Tomcat loses its connection(s) and does not re-establish these connections. -- And on the seventh day, He exited from append mode. (Book of create(2), line 255) - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
RE: Tomcat reconnect to database server?
You may also want to put in a validation query, it adds overhead, but it forces a reconnection.. I had a similar problem with postgres where the pooled connections didn't know they were no longer properly connected. By adding the validation query, it forces the manager to verify connection before handing the connection down to the requesting code. -Art -Original Message- From: Philipp Taprogge [mailto:[EMAIL PROTECTED] Sent: Wednesday, January 07, 2004 9:47 AM To: Tomcat Users List Subject: Re: Tomcat reconnect to database server? Hi! I don't know MSSQL in particular, but in princible it should be as simple as adding ?autoreconnect=true to the driver URL. Phil Derek Mahar wrote: How can I configure Tomcat 5.0.16 to reconnect to a Microsot SQL Server after a server restart? I have configured Tomcat to use JNDI datasources (through Resource and ResourceParam elements within GlobalNamingResources). I presume that at startup, Tomcat connects to the server and creates a pool of connections for later use. However, when we restart our server, Tomcat loses its connection(s) and does not re-establish these connections. -- And on the seventh day, He exited from append mode. (Book of create(2), line 255) - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
RE: Tomcat reconnect to database server?
Thanks for your reply. Unfortunately, the Microsoft SQL Server JDBC driver does not support an autoreconnect option. Do I need a separate connection pool manager? The MS SQL Server JDBC driver documentation suggests that I might need such a manager since the driver does not itself manage the connection pool. Derek -Original Message- From: Philipp Taprogge [mailto:[EMAIL PROTECTED] Sent: January 7, 2004 9:47 AM To: Tomcat Users List Subject: Re: Tomcat reconnect to database server? Hi! I don't know MSSQL in particular, but in princible it should be as simple as adding ?autoreconnect=true to the driver URL. Phil Derek Mahar wrote: How can I configure Tomcat 5.0.16 to reconnect to a Microsot SQL Server after a server restart? I have configured Tomcat to use JNDI datasources (through Resource and ResourceParam elements within GlobalNamingResources). I presume that at startup, Tomcat connects to the server and creates a pool of connections for later use. However, when we restart our server, Tomcat loses its connection(s) and does not re-establish these connections. -- And on the seventh day, He exited from append mode. (Book of create(2), line 255) - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
RE: Tomcat reconnect to database server?
Where do I specify the validation query? Is there a way to configure the default connection pool manager? Derek -Original Message- From: D'Alessandro, Arthur [mailto:[EMAIL PROTECTED] Sent: January 7, 2004 9:48 AM To: Tomcat Users List Subject: RE: Tomcat reconnect to database server? You may also want to put in a validation query, it adds overhead, but it forces a reconnection.. I had a similar problem with postgres where the pooled connections didn't know they were no longer properly connected. By adding the validation query, it forces the manager to verify connection before handing the connection down to the requesting code. -Art -Original Message- From: Philipp Taprogge [mailto:[EMAIL PROTECTED] Sent: Wednesday, January 07, 2004 9:47 AM To: Tomcat Users List Subject: Re: Tomcat reconnect to database server? Hi! I don't know MSSQL in particular, but in princible it should be as simple as adding ?autoreconnect=true to the driver URL. Phil Derek Mahar wrote: How can I configure Tomcat 5.0.16 to reconnect to a Microsot SQL Server after a server restart? I have configured Tomcat to use JNDI datasources (through Resource and ResourceParam elements within GlobalNamingResources). I presume that at startup, Tomcat connects to the server and creates a pool of connections for later use. However, when we restart our server, Tomcat loses its connection(s) and does not re-establish these connections. -- And on the seventh day, He exited from append mode. (Book of create(2), line 255) - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
RE: Tomcat reconnect to database server?
The DBCP pool that you lookup from JNDI is already such a connection manager. Just try adding the validation query that Arthur suggested. Im not sure for MSSQL but I use this for Oracle: parameter namevalidationQuery/name valueSELECT 1 FROM dual/value /parameter This goes underResourceParams name=jdbc/your_resource BR -Original Message- From: Derek Mahar [mailto:[EMAIL PROTECTED] Sent: 07 2004 . 18:21 To: Tomcat Users List Subject: RE: Tomcat reconnect to database server? Thanks for your reply. Unfortunately, the Microsoft SQL Server JDBC driver does not support an autoreconnect option. Do I need a separate connection pool manager? The MS SQL Server JDBC driver documentation suggests that I might need such a manager since the driver does not itself manage the connection pool. Derek -Original Message- From: Philipp Taprogge [mailto:[EMAIL PROTECTED] Sent: January 7, 2004 9:47 AM To: Tomcat Users List Subject: Re: Tomcat reconnect to database server? Hi! I don't know MSSQL in particular, but in princible it should be as simple as adding ?autoreconnect=true to the driver URL. Phil Derek Mahar wrote: How can I configure Tomcat 5.0.16 to reconnect to a Microsot SQL Server after a server restart? I have configured Tomcat to use JNDI datasources (through Resource and ResourceParam elements within GlobalNamingResources). I presume that at startup, Tomcat connects to the server and creates a pool of connections for later use. However, when we restart our server, Tomcat loses its connection(s) and does not re-establish these connections. -- And on the seventh day, He exited from append mode. (Book of create(2), line 255) - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
RE: Tomcat reconnect to database server?
Does this force it to reconnect in the case of an error? I know the documentation lists adding ?autoreconnect=true to the connection string to cause this to happen. Course I have only seen this with MySQL Databases. -Steve P.S. has anyone gotten the MySQL driver failover to work? -Original Message- From: Altankov Peter [mailto:[EMAIL PROTECTED] Sent: Wednesday, January 07, 2004 10:38 AM To: Tomcat Users List Subject: RE: Tomcat reconnect to database server? The DBCP pool that you lookup from JNDI is already such a connection manager. Just try adding the validation query that Arthur suggested. Im not sure for MSSQL but I use this for Oracle: parameter namevalidationQuery/name valueSELECT 1 FROM dual/value /parameter This goes underResourceParams name=jdbc/your_resource BR -Original Message- From: Derek Mahar [mailto:[EMAIL PROTECTED] Sent: 07 2004 . 18:21 To: Tomcat Users List Subject: RE: Tomcat reconnect to database server? Thanks for your reply. Unfortunately, the Microsoft SQL Server JDBC driver does not support an autoreconnect option. Do I need a separate connection pool manager? The MS SQL Server JDBC driver documentation suggests that I might need such a manager since the driver does not itself manage the connection pool. Derek -Original Message- From: Philipp Taprogge [mailto:[EMAIL PROTECTED] Sent: January 7, 2004 9:47 AM To: Tomcat Users List Subject: Re: Tomcat reconnect to database server? Hi! I don't know MSSQL in particular, but in princible it should be as simple as adding ?autoreconnect=true to the driver URL. Phil Derek Mahar wrote: How can I configure Tomcat 5.0.16 to reconnect to a Microsot SQL Server after a server restart? I have configured Tomcat to use JNDI datasources (through Resource and ResourceParam elements within GlobalNamingResources). I presume that at startup, Tomcat connects to the server and creates a pool of connections for later use. However, when we restart our server, Tomcat loses its connection(s) and does not re-establish these connections. -- And on the seventh day, He exited from append mode. (Book of create(2), line 255) - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
