Configure ADO.NET logs

You can configure the ADO.NET driver's logging behavior at the registry level with HKEY_LOCAL_MACHINE\SOFTWARE\Vertica\ADO.NET\Driver and the class level with VerticaLogProperties.

Registry-level settings

The following parameters control how messages between the client and server are logged. If they are not set, then the client library does not log any messages.

To set these parameters on Windows, edit the keys in the Windows Registry under HKEY_LOCAL_MACHINE\SOFTWARE\Vertica\ADO.NET\Driver.

LogLevel

The minimum severity of a message for it to be logged:

• 0: No logging
• 1: Fatal errors
• 2: errors
• 3: Warnings
• 4: Info
• 5: Debug
• 6: Trace (all messages)

For example, a LogLevel of 3 means that the client driver logs messages with severities 0, 1, 2, and 3.

LogPath

The absolute path of a directory to store log files. For example: /var/log/verticaadonet.

LogNamespace

Limits logging to messages generated by certain objects in the client driver.

C#PreloadLogging

Normally, logging only starts after the driver has fully loaded. This option specifies whether the ADO.NET driver should start logging before the driver has fully loaded, set to one of the following:

• 0: Do not start logging until the driver has loaded.
• 1: Start logging as soon as possible.

Class-level settings

You can set the log properties of the ADO.NET driver with the VerticaLogProperties static class. This class includes the following methods:

• SetLogPath(String path, bool persist): Must be set before the connection starts.
• SetLogNamespace(String lognamespace, bool persist)
• SetLogLevel(VerticaLogLevel loglevel, bool persist)

Logs are created when the first connection is opened, so you cannot change the log path after the connection starts. You can change the log level and log namespace at any time.

The persist parameter controls whether the setting is written to the client's Windows Registry, where it will be used for all subsequent connections. If set to false, then the setting only applies to the current session.

SetLogPath

The SetLogPath method takes as its arguments a string containing the path to the log file and the persist argument. If the path string contains only a directory path, then the log file is created with the name vdp-driver-MM-dd_HH.mm.ss.log (where MM-dd_HH.mm.ss is the date and time the log was created). If the path ends in a filename, such as log.txt or log.log, then the log is created with that filename.

If SetLogPath is called with an empty string for the path argument, then the client executable's current directory is used as the log path.

If SetLogPath is not called and no registry entry exists for the log path, and you have called any of the other VerticaLogProperties methods, then the client executable's current directory is used as the log path.

When the persist argument is set to true, the path specified is copied to the registry verbatim. If no filename was specified, then the filename is not saved to the registry.

For example:

//set the log path
string path = "C:\\log";
VerticaLogProperties.SetLogPath(path, false);

SetLogNamespace

The SetLogNamespace method takes as its arguments a string containing the namespace to log and the persist argument. The namespace string to log can be one of the following:

• Vertica
• Vertica.Data.VerticaClient
• Vertica.Data.Internal.IO
• Vertica.Data.Internal.DataEngine
• Vertica.Data.Internal.Core

Namespaces can be truncated to include multiple child namespaces. For example, you can specify Vertica.Data.Internal to log for all of the Vertica.Data.Internal namespaces.

If a log namespace is not set, and no value is stored in the registry, then the "Vertica" namespace is used for logging.

For example:

//set namespace to log
string lognamespace = "Vertica.Data.VerticaClient";
VerticaLogProperties.SetLogNamespace(lognamespace, false);

SetLogLevel

The SetLogLevel method takes as its arguments a VerticaLogLevel type and the persist argument. The VerticaLogLevel argument can be one of:

• VerticaLogLevel.None
• VerticaLogLevel.Fatal
• VerticaLogLevel.Error
• VerticaLogLevel.Warning
• VerticaLogLevel.Info
• VerticaLogLevel.Debug
• VerticaLogLevel.Trace

If a log level is not set, and no value is stored in the registry, then VerticaLogLevel.None is used.

For example:

//set log level
VerticaLogLevel level = VerticaLogLevel.Debug;
VerticaLogProperties.SetLogLevel(level, false);

Getting Log Properties

You can get the log property values using the getters included in the VerticaLogProperties class. The properties are:

• LogPath
• LogNamespace
• LogLevel

For example:

//get current log settings
string logpath = VerticaLogProperties.LogPath;
VerticaLogLevel loglevel = VerticaLogProperties.LogLevel;
string logns = VerticaLogProperties.LogNamespace;
Console.WriteLine("Current Log Settings:");
Console.WriteLine("Log Path: " + logpath);
Console.WriteLine("Log Level: " + loglevel);
Console.WriteLine("Log Namespace: " + logns);

Examples

This complete example shows how to set and get log properties:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data;
using Vertica.Data.VerticaClient;
namespace ConsoleApplication
{
    class Program
    {
        static void Main(string[] args)
        {
            //configure connection properties
            VerticaConnectionStringBuilder builder = new VerticaConnectionStringBuilder();
            builder.Host = "192.168.1.10";
            builder.Database = "VMart";
            builder.User = "dbadmin";
            
            //get current log settings
            string logpath = VerticaLogProperties.LogPath;
            VerticaLogLevel loglevel = VerticaLogProperties.LogLevel;
            string logns = VerticaLogProperties.LogNamespace;
            Console.WriteLine("\nOld Log Settings:");
            Console.WriteLine("Log Path: " + logpath);
            Console.WriteLine("Log Level: " + loglevel);
            Console.WriteLine("Log Namespace: " + logns);

            //set the log path
            string path = "C:\\log";
            VerticaLogProperties.SetLogPath(path, false);

            // set log level
            VerticaLogLevel level = VerticaLogLevel.Debug;
            VerticaLogProperties.SetLogLevel(level, false);

            //set namespace to log
            string lognamespace = "Vertica";
            VerticaLogProperties.SetLogNamespace(lognamespace, false);
            
            //open the connection
            VerticaConnection _conn = new VerticaConnection(builder.ToString());
            _conn.Open();

            //get new log settings
            logpath = VerticaLogProperties.LogPath;
            loglevel = VerticaLogProperties.LogLevel;
            logns = VerticaLogProperties.LogNamespace;
            Console.WriteLine("\nNew Log Settings:");
            Console.WriteLine("Log Path: " + logpath);
            Console.WriteLine("Log Level: " + loglevel);
            Console.WriteLine("Log Namespace: " + logns);

            //close the connection
            _conn.Close();
        }
    }
}

The example produces the following output:

Old Log Settings:
Log Path:
Log Level: None
Log Namespace:
New Log Settings:
Log Path: C:\log
Log Level: Debug
Log Namespace: Vertica