我有一个简单的asp.net核心Web应用程序（v2.1），已将其部署到Linux上的B1（并尝试使用B2）Azure App Service。当我调用dbContext.SaveChanges()时，添加一个非常简单的实体后，该请求大约需要30秒，然后引发以下错误：
Microsoft.Data.Sqlite.SqliteException (0x80004005): SQLite Error 5: 'database is locked'.
这是代码。 _dbContext注入了作用域生存期。
public async Task<IActionResult> SignIn([Bind("Email,Password,RedirectUrl")] SignInModel model) {
if (ModelState.IsValid) {
var user = _dbContext.Users.Include(u => u.Claims).FirstOrDefault(u => u.UserName == model.Email);
...
user.LastLogin = DateTimeOffset.Now;
await _dbContext.SaveChangesAsync();
...
return Redirect(String.IsNullOrWhiteSpace(model.RedirectUrl) ? "/" : model.RedirectUrl);
}
else {
return View(model);
}
}
在30秒钟内，我通过SSH看到SQLite DB文件旁边存在一个日志文件。最终被删除了。
更新：这是日志。您可以看到，在一次更新调用之后，恰好30秒后引发了一个锁定异常。 SQL命令超时为30秒。我正在使用远程SSH Shell监视文件系统，并且日志文件在那里存在约30秒。就像应用程序服务所使用的网络共享和SQLite文件锁定逻辑的组合损坏或非常缓慢一样。
2018-12-20T15:06:27.660624755Z [40m[32minfo[39m[22m[49m: Microsoft.AspNetCore.Hosting.Internal.WebHost[1]
2018-12-20T15:06:27.660656156Z Request starting HTTP/1.1 POST http://insecuresite.azurewebsites.net/Account/SignIn application/x-www-form-urlencoded 56
2018-12-20T15:06:27.660797960Z [15:06:27 DBG] InsecureSite.Middleware.MyCookieAuthHandler:Constructor called.
2018-12-20T15:06:27.660875561Z [15:06:27 DBG] InsecureSite.Middleware.MyCookieAuthHandler:Constructor called.
2018-12-20T15:06:27.660885462Z [15:06:27 DBG] InsecureSite.Middleware.MyCookieAuthHandler:HandleAuthenticateAsync called.
2018-12-20T15:06:27.660890662Z [15:06:27 DBG] InsecureSite.Middleware.MyCookieAuthHandler:HandleAuthenticateAsync called.
2018-12-20T15:06:27.661837484Z [40m[32minfo[39m[22m[49m: Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker[1]
2018-12-20T15:06:27.661856585Z Route matched with {action = "SignIn", controller = "Account"}. Executing action InsecureSite.Controllers.AccountController.SignIn (InsecureSite)
2018-12-20T15:06:27.662465200Z [40m[32minfo[39m[22m[49m: Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker[1]
2018-12-20T15:06:27.662478400Z Executing action method InsecureSite.Controllers.AccountController.SignIn (InsecureSite) with arguments (InsecureSite.Models.SignInModel) - Validation state: Valid
2018-12-20T15:06:27.667736726Z [40m[32minfo[39m[22m[49m: Microsoft.EntityFrameworkCore.Infrastructure[10403]
2018-12-20T15:06:27.667751427Z Entity Framework Core 2.1.4-rtm-31024 initialized 'AppDbContext' using provider 'Microsoft.EntityFrameworkCore.Sqlite' with options: None
2018-12-20T15:06:27.716864407Z [40m[32minfo[39m[22m[49m: Microsoft.EntityFrameworkCore.Database.Command[20101]
2018-12-20T15:06:27.716886507Z Executed DbCommand (0ms) [Parameters=[], CommandType='Text', CommandTimeout='30']
2018-12-20T15:06:27.716892507Z PRAGMA foreign_keys=ON;
2018-12-20T15:06:27.776374136Z [40m[32minfo[39m[22m[49m: Microsoft.EntityFrameworkCore.Database.Command[20101]
2018-12-20T15:06:27.776410837Z Executed DbCommand (59ms) [Parameters=[@__model_Email_0='?' (Size = 18)], CommandType='Text', CommandTimeout='30']
2018-12-20T15:06:27.776514640Z SELECT "u"."UserId", "u"."FirstName", "u"."LastLogin", "u"."LastName", "u"."PasswordHash", "u"."UserName"
2018-12-20T15:06:27.776526140Z FROM "Users" AS "u"
2018-12-20T15:06:27.776531140Z WHERE "u"."UserName" = @__model_Email_0
2018-12-20T15:06:27.776536040Z ORDER BY "u"."UserId"
2018-12-20T15:06:27.776540740Z LIMIT 1
2018-12-20T15:06:27.778553489Z [40m[32minfo[39m[22m[49m: Microsoft.EntityFrameworkCore.Database.Command[20101]
2018-12-20T15:06:27.778567689Z Executed DbCommand (1ms) [Parameters=[@__model_Email_0='?' (Size = 18)], CommandType='Text', CommandTimeout='30']
2018-12-20T15:06:27.778840096Z SELECT "u.Claims"."UserClaimId", "u.Claims"."Claim", "u.Claims"."UserId", "u.Claims"."Value"
2018-12-20T15:06:27.778852696Z FROM "UserClaims" AS "u.Claims"
2018-12-20T15:06:27.778857796Z INNER JOIN (
2018-12-20T15:06:27.778862596Z SELECT "u0"."UserId"
2018-12-20T15:06:27.778869696Z FROM "Users" AS "u0"
2018-12-20T15:06:27.778874396Z WHERE "u0"."UserName" = @__model_Email_0
2018-12-20T15:06:27.778879897Z ORDER BY "u0"."UserId"
2018-12-20T15:06:27.780228429Z LIMIT 1
2018-12-20T15:06:27.780242129Z ) AS "t" ON "u.Claims"."UserId" = "t"."UserId"
2018-12-20T15:06:27.780247829Z ORDER BY "t"."UserId"
2018-12-20T15:06:27.789636555Z [40m[32minfo[39m[22m[49m: Microsoft.EntityFrameworkCore.Database.Command[20101]
2018-12-20T15:06:27.789651955Z Executed DbCommand (0ms) [Parameters=[], CommandType='Text', CommandTimeout='30']
2018-12-20T15:06:27.789657656Z PRAGMA foreign_keys=ON;
2018-12-20T15:06:27.794111763Z [40m[32minfo[39m[22m[49m: Microsoft.EntityFrameworkCore.Database.Command[20101]
2018-12-20T15:06:27.794126763Z Executed DbCommand (4ms) [Parameters=[@p1='?', @p0='?'], CommandType='Text', CommandTimeout='30']
2018-12-20T15:06:27.794132363Z UPDATE "Users" SET "LastLogin" = @p0
2018-12-20T15:06:27.794280267Z WHERE "UserId" = @p1;
2018-12-20T15:06:27.794298667Z SELECT changes();
2018-12-20T15:06:57.833069471Z [41m[30mfail[39m[22m[49m: Microsoft.EntityFrameworkCore.Database.Transaction[20205]
2018-12-20T15:06:57.833107571Z An error occurred using a transaction.
2018-12-20T15:06:57.833113572Z Microsoft.Data.Sqlite.SqliteException (0x80004005): SQLite Error 5: 'database is locked'.
2018-12-20T15:06:57.833118772Z at Microsoft.Data.Sqlite.SqliteException.ThrowExceptionForRC(Int32 rc, sqlite3 db)
2018-12-20T15:06:57.833123772Z at Microsoft.Data.Sqlite.SqliteCommand.ExecuteReader(CommandBehavior behavior)
2018-12-20T15:06:57.833128672Z at Microsoft.Data.Sqlite.SqliteCommand.ExecuteNonQuery()
2018-12-20T15:06:57.833133672Z at Microsoft.Data.Sqlite.SqliteConnectionExtensions.ExecuteNonQuery(SqliteConnection connection, String commandText)
2018-12-20T15:06:57.833138672Z at Microsoft.Data.Sqlite.SqliteTransaction.Commit()
2018-12-20T15:06:57.833143372Z at Microsoft.EntityFrameworkCore.Storage.RelationalTransaction.Commit()
2018-12-20T15:06:57.853805669Z [41m[30mfail[39m[22m[49m: Microsoft.EntityFrameworkCore.Update[10000]
2018-12-20T15:06:57.853833569Z An exception occurred in the database while saving changes for context type 'InsecureSite.Data.AppDbContext'.
2018-12-20T15:06:57.853928072Z Microsoft.Data.Sqlite.SqliteException (0x80004005): SQLite Error 5: 'database is locked'.
2018-12-20T15:06:57.853938272Z at Microsoft.Data.Sqlite.SqliteException.ThrowExceptionForRC(Int32 rc, sqlite3 db)
2018-12-20T15:06:57.853943572Z at Microsoft.Data.Sqlite.SqliteCommand.ExecuteReader(CommandBehavior behavior)
2018-12-20T15:06:57.854041474Z at Microsoft.Data.Sqlite.SqliteCommand.ExecuteNonQuery()
2018-12-20T15:06:57.854051475Z at Microsoft.Data.Sqlite.SqliteConnectionExtensions.ExecuteNonQuery(SqliteConnection connection, String commandText)
2018-12-20T15:06:57.854056675Z at Microsoft.Data.Sqlite.SqliteTransaction.Commit()
2018-12-20T15:06:57.854137377Z at Microsoft.EntityFrameworkCore.Storage.RelationalTransaction.Commit()
2018-12-20T15:06:57.854146577Z at Microsoft.EntityFrameworkCore.Update.Internal.BatchExecutor.ExecuteAsync(DbContext _, ValueTuple`2 parameters, CancellationToken cancellationToken)
2018-12-20T15:06:57.854208178Z at Microsoft.EntityFrameworkCore.ChangeTracking.Internal.StateManager.SaveChangesAsync(IReadOnlyList`1 entriesToSave, CancellationToken cancellationToken)
2018-12-20T15:06:57.854283180Z at Microsoft.EntityFrameworkCore.ChangeTracking.Internal.StateManager.SaveChangesAsync(Boolean acceptAllChangesOnSuccess, CancellationToken cancellationToken)
2018-12-20T15:06:57.854292080Z at Microsoft.EntityFrameworkCore.DbContext.SaveChangesAsync(Boolean acceptAllChangesOnSuccess, CancellationToken cancellationToken)
2018-12-20T15:06:57.854299081Z Microsoft.Data.Sqlite.SqliteException (0x80004005): SQLite Error 5: 'database is locked'.
2018-12-20T15:06:57.854366282Z at Microsoft.Data.Sqlite.SqliteException.ThrowExceptionForRC(Int32 rc, sqlite3 db)
2018-12-20T15:06:57.854384483Z at Microsoft.Data.Sqlite.SqliteCommand.ExecuteReader(CommandBehavior behavior)
2018-12-20T15:06:57.854389683Z at Microsoft.Data.Sqlite.SqliteCommand.ExecuteNonQuery()
2018-12-20T15:06:57.854455384Z at Microsoft.Data.Sqlite.SqliteConnectionExtensions.ExecuteNonQuery(SqliteConnection connection, String commandText)
2018-12-20T15:06:57.854463685Z at Microsoft.Data.Sqlite.SqliteTransaction.Commit()
2018-12-20T15:06:57.854468185Z at Microsoft.EntityFrameworkCore.Storage.RelationalTransaction.Commit()
2018-12-20T15:06:57.854529686Z at Microsoft.EntityFrameworkCore.Update.Internal.BatchExecutor.ExecuteAsync(DbContext _, ValueTuple`2 parameters, CancellationToken cancellationToken)
2018-12-20T15:06:57.854652489Z at Microsoft.EntityFrameworkCore.ChangeTracking.Internal.StateManager.SaveChangesAsync(IReadOnlyList`1 entriesToSave, CancellationToken cancellationToken)
2018-12-20T15:06:57.854673890Z at Microsoft.EntityFrameworkCore.ChangeTracking.Internal.StateManager.SaveChangesAsync(Boolean acceptAllChangesOnSuccess, CancellationToken cancellationToken)
2018-12-20T15:06:57.854748391Z at Microsoft.EntityFrameworkCore.DbContext.SaveChangesAsync(Boolean acceptAllChangesOnSuccess, CancellationToken cancellationToken)
2018-12-20T15:06:57.858109772Z [40m[32minfo[39m[22m[49m: Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker[2]
2018-12-20T15:06:57.858123973Z Executed action InsecureSite.Controllers.AccountController.SignIn (InsecureSite) in 30193.6715ms
2018-12-20T15:06:57.860885139Z [41m[30mfail[39m[22m[49m: Microsoft.AspNetCore.Diagnostics.ExceptionHandlerMiddleware[1]
2018-12-20T15:06:57.860899939Z An unhandled exception has occurred while executing the request.
2018-12-20T15:06:57.860905239Z Microsoft.Data.Sqlite.SqliteException (0x80004005): SQLite Error 5: 'database is locked'.
2018-12-20T15:06:57.861009242Z at Microsoft.Data.Sqlite.SqliteException.ThrowExceptionForRC(Int32 rc, sqlite3 db)
2018-12-20T15:06:57.861018942Z at Microsoft.Data.Sqlite.SqliteCommand.ExecuteReader(CommandBehavior behavior)
2018-12-20T15:06:57.861023842Z at Microsoft.Data.Sqlite.SqliteCommand.ExecuteNonQuery()
2018-12-20T15:06:57.861120545Z at Microsoft.Data.Sqlite.SqliteConnectionExtensions.ExecuteNonQuery(SqliteConnection connection, String commandText)
2018-12-20T15:06:57.861130145Z at Microsoft.Data.Sqlite.SqliteTransaction.Commit()
2018-12-20T15:06:57.861134745Z at Microsoft.EntityFrameworkCore.Storage.RelationalTransaction.Commit()
2018-12-20T15:06:57.861237547Z at Microsoft.EntityFrameworkCore.Update.Internal.BatchExecutor.ExecuteAsync(DbContext _, ValueTuple`2 parameters, CancellationToken cancellationToken)
2018-12-20T15:06:57.861311249Z at Microsoft.EntityFrameworkCore.ChangeTracking.Internal.StateManager.SaveChangesAsync(IReadOnlyList`1 entriesToSave, CancellationToken cancellationToken)
2018-12-20T15:06:57.861320149Z at Microsoft.EntityFrameworkCore.ChangeTracking.Internal.StateManager.SaveChangesAsync(Boolean acceptAllChangesOnSuccess, CancellationToken cancellationToken)
2018-12-20T15:06:57.861392851Z at Microsoft.EntityFrameworkCore.DbContext.SaveChangesAsync(Boolean acceptAllChangesOnSuccess, CancellationToken cancellationToken)
2018-12-20T15:06:57.861401851Z at InsecureSite.Controllers.AccountController.SignIn(SignInModel model) in /home/site/repository/InsecureSite/Controllers/AccountController.cs:line 57
2018-12-20T15:06:57.861463253Z at Microsoft.AspNetCore.Mvc.Internal.ActionMethodExecutor.TaskOfIActionResultExecutor.Execute(IActionResultTypeMapper mapper, ObjectMethodExecutor executor, Object controller, Object[] arguments)
2018-12-20T15:06:57.861472053Z at System.Threading.Tasks.ValueTask`1.get_Result()
2018-12-20T15:06:57.861541855Z at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.InvokeActionMethodAsync()
2018-12-20T15:06:57.861550055Z at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.InvokeNextActionFilterAsync()
2018-12-20T15:06:57.861554655Z at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.Rethrow(ActionExecutedContext context)
2018-12-20T15:06:57.861629257Z at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted)
2018-12-20T15:06:57.861639057Z at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.InvokeInnerFilterAsync()
2018-12-20T15:06:57.861718659Z at Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.InvokeNextResourceFilter()
2018-12-20T15:06:57.861727059Z at Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.Rethrow(ResourceExecutedContext context)
2018-12-20T15:06:57.861791861Z at Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted)
2018-12-20T15:06:57.861800861Z at Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.InvokeFilterPipelineAsync()
2018-12-20T15:06:57.861805561Z at Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.InvokeAsync()
2018-12-20T15:06:57.861810161Z at Microsoft.AspNetCore.Builder.RouterMiddleware.Invoke(HttpContext httpContext)
2018-12-20T15:06:57.861880363Z at Microsoft.AspNetCore.Authentication.AuthenticationMiddleware.Invoke(HttpContext context)
2018-12-20T15:06:57.861888363Z at Microsoft.AspNetCore.StaticFiles.StaticFileMiddleware.Invoke(HttpContext context)
2018-12-20T15:06:57.861948164Z at Microsoft.AspNetCore.Diagnostics.ExceptionHandlerMiddleware.Invoke(HttpContext context)
2018-12-20T15:06:57.862056667Z [40m[32minfo[39m[22m[49m: Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker[1]
2018-12-20T15:06:57.862066767Z Route matched with {action = "Error", controller = "Home"}. Executing action InsecureSite.Controllers.HomeController.Error (InsecureSite)
2018-12-20T15:06:57.867899207Z [40m[32minfo[39m[22m[49m: Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker[1]
2018-12-20T15:06:57.867914108Z Executing action method InsecureSite.Controllers.HomeController.Error (InsecureSite) - Validation state: Valid
2018-12-20T15:06:57.868025910Z [40m[32minfo[39m[22m[49m: Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker[2]
2018-12-20T15:06:57.868045011Z Executed action method InsecureSite.Controllers.HomeController.Error (InsecureSite), returned result Microsoft.AspNetCore.Mvc.ViewResult in 0.0771ms.
2018-12-20T15:06:57.868147613Z [40m[32minfo[39m[22m[49m: Microsoft.AspNetCore.Mvc.ViewFeatures.ViewResultExecutor[1]
2018-12-20T15:06:57.868157914Z Executing ViewResult, running view Error.
2018-12-20T15:06:57.869182938Z [40m[32minfo[39m[22m[49m: Microsoft.AspNetCore.Mvc.ViewFeatures.ViewResultExecutor[4]
2018-12-20T15:06:57.869196139Z Executed ViewResult - view Error executed in 7.5623ms.
2018-12-20T15:06:57.869201439Z [40m[32minfo[39m[22m[49m: Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker[2]
2018-12-20T15:06:57.869206339Z Executed action InsecureSite.Controllers.HomeController.Error (InsecureSite) in 7.9125ms
2018-12-20T15:06:57.869222639Z [40m[32minfo[39m[22m[49m: Microsoft.AspNetCore.Hosting.Internal.WebHost[2]
2018-12-20T15:06:57.869228039Z Request finished in 30208.5835ms 500 text/html; charset=utf-8
2018-12-20T15:08:44 No new trace in the past 1 min(s).
没有其他任何请求到达此Web应用程序。我是唯一提出要求的人。
控制器可以从数据库文件读取数据而不会出错。我看到在失败的写入之前需要进行3ms和6ms的几次查询。
我看到有一个issue带有锁定和多个线程，但是它是固定的，而且我使用的是该修订版（2.1.4）的更高版本
答案 0 :(得分：0)
这通常是由于打开或挂起的连接请求而导致的，这些请求由于某些较早的过程抢了锁而无法处理。您可以尝试以下实现，使用该实现可以正确地in order处理连接和命令。
private static void ExecuteNonQuery(string queryString)
{
using (var connection = new SQLiteConnection(
ConnectionString))
{
using (var command = new SQLiteCommand(queryString, connection))
{
command.Connection.Open();
command.ExecuteNonQuery();
}
}
}
答案 1 :(得分：0)
可以分享您的更新方法吗？有时数据库被锁定，因为C＃代码未正确使用数据库连接/事务。
我建议您看看更新方法，看看是否正确使用了数据库连接和事务。 microsoft documentation might help
using (var context = new BloggingContext())
{
using (var transaction = context.Database.BeginTransaction())
{
try
{
context.Blogs.Add(new Blog { Url = "http://blogs.msdn.com/dotnet" });
context.SaveChanges();
context.Blogs.Add(new Blog { Url = "http://blogs.msdn.com/visualstudio" });
context.SaveChanges();
var blogs = context.Blogs
.OrderBy(b => b.Url)
.ToList();
// Commit transaction if all commands succeed, transaction will auto-rollback
// when disposed if either commands fails
transaction.Commit();
}
catch (Exception)
{
// TODO: Handle failure
}
}
}