Use raw sql to write logs to db.

src/NzbDrone.Core.Test/InstrumentationTests/DatabaseTargetFixture.cs

@@ -1,6 +1,7 @@
 using System;
 using System.Diagnostics;
 using FluentAssertions;
+using Marr.Data;
 using NLog;
 using NUnit.Framework;
 using NzbDrone.Common.Instrumentation;
@@ -65,6 +66,19 @@ namespace NzbDrone.Core.Test.InstrumentationTests
             VerifyLog(StoredModel, LogLevel.Info);
         }
 
+
+        [Test]
+        [Explicit]
+        public void perf_test()
+        {
+            MapRepository.Instance.EnableTraceLogging = false;
+            for (int i = 0; i < 1000; i++)
+            {
+                _logger.Info(Guid.NewGuid());
+            }
+            MapRepository.Instance.EnableTraceLogging = true;
+        }
+
         [Test]
         public void write_log_exception()
         {

src/NzbDrone.Core/Datastore/ConnectionStringFactory.cs

@@ -30,6 +30,7 @@ namespace NzbDrone.Core.Datastore
             connectionBuilder.CacheSize = (int)-10.Megabytes();
             connectionBuilder.DateTimeKind = DateTimeKind.Utc;
             connectionBuilder.JournalMode = SQLiteJournalModeEnum.Wal;
+            connectionBuilder.Pooling = true;
 
             return connectionBuilder.ConnectionString;
         }

src/NzbDrone.Core/Instrumentation/DatabaseTarget.cs

@@ -1,4 +1,5 @@
 using System;
+using System.Data;
 using System.Data.SQLite;
 using NLog.Common;
 using NLog.Config;
@@ -6,6 +7,7 @@ using NLog;
 using NLog.Layouts;
 using NLog.Targets;
 using NzbDrone.Common.Instrumentation;
+using NzbDrone.Core.Datastore;
 using NzbDrone.Core.Lifecycle;
 using NzbDrone.Core.Messaging.Events;
 
@@ -14,11 +16,14 @@ namespace NzbDrone.Core.Instrumentation
 
     public class DatabaseTarget : TargetWithLayout, IHandle<ApplicationShutdownRequested>
     {
-        private readonly ILogRepository _repository;
+        private readonly SQLiteConnection _connection;
 
-        public DatabaseTarget(ILogRepository repository)
+        const string INSERT_COMMAND = "INSERT INTO [Logs]([Message],[Time],[Logger],[Method],[Exception],[ExceptionType],[Level]) " +
+                                      "VALUES(@Message,@Time,@Logger,@Method,@Exception,@ExceptionType,@Level)";
+
+        public DatabaseTarget(IConnectionStringFactory connectionStringFactory)
         {
-            _repository = repository;
+            _connection = new SQLiteConnection(connectionStringFactory.LogDbConnectionString).OpenAndReturn();
         }
 
         public void Register()
@@ -50,6 +55,8 @@ namespace NzbDrone.Core.Instrumentation
         public LoggingRule Rule { get; set; }
 
         protected override void Write(LogEventInfo logEvent)
+        {
+            try
             {
                 var log = new Log();
                 log.Time = logEvent.TimeStamp;
@@ -82,9 +89,17 @@ namespace NzbDrone.Core.Instrumentation
 
                 log.Level = logEvent.Level.Name;
 
-            try
-            {
-                _repository.Insert(log);
+                var sqlCommand = new SQLiteCommand(INSERT_COMMAND, _connection);
+
+                sqlCommand.Parameters.Add(new SQLiteParameter("Message", DbType.String) { Value = log.Message });
+                sqlCommand.Parameters.Add(new SQLiteParameter("Time", DbType.DateTime) { Value = log.Time });
+                sqlCommand.Parameters.Add(new SQLiteParameter("Logger", DbType.String) { Value = log.Logger });
+                sqlCommand.Parameters.Add(new SQLiteParameter("Method", DbType.String) { Value = log.Method });
+                sqlCommand.Parameters.Add(new SQLiteParameter("Exception", DbType.String) { Value = log.Exception });
+                sqlCommand.Parameters.Add(new SQLiteParameter("ExceptionType", DbType.String) { Value = log.ExceptionType });
+                sqlCommand.Parameters.Add(new SQLiteParameter("Level", DbType.String) { Value = log.Level });
+
+                sqlCommand.ExecuteNonQuery();
             }
             catch (SQLiteException ex)
             {