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Unable to fetch data using SQL Server datalength function due to performance issues

I have a documents table in my database. The document table structure is like
CREATE TABLE [dbo].[Documents]
(
[DocumentId] [BIGINT] NOT NULL IDENTITY(1, 1),
[ObjectType] [VARCHAR](50) COLLATE SQL_Latin1_General_CP1_CI_AS NOT NULL,
[ObjectId] [BIGINT] NOT NULL,
[DocumentName] [VARCHAR](250) COLLATE SQL_Latin1_General_CP1_CI_AS NOT NULL,
[DocumentFile] [VARBINARY](MAX) NOT NULL,
[isTemp] [BIT] NOT NULL CONSTRAINT [DF_Documents_isTemp] DEFAULT ((0)),
[IsActive] [BIT] NOT NULL,
[RowGuid] [UNIQUEIDENTIFIER] NOT NULL CONSTRAINT [DF_Documents_RowGuid] DEFAULT (newid()),
[CreatedBy] [BIGINT] NOT NULL,
[CreatedOn] [DATETIME] NOT NULL,
[UpdatedBy] [BIGINT] NULL,
[UpdatedOn] [DATETIME] NULL
)
GO
-- Constraints and Indexes
ALTER TABLE [dbo].[Documents]
ADD CONSTRAINT [PK_Documents]
PRIMARY KEY CLUSTERED ([DocumentId])
GO
CREATE NONCLUSTERED INDEX [ix_DocumentName]
ON [dbo].[Documents] ([DocumentName])
GO
CREATE NONCLUSTERED INDEX [ix_ObjectId]
ON [dbo].[Documents] ([ObjectId])
GO
CREATE NONCLUSTERED INDEX [ix_ObjectType]
ON [dbo].[Documents] ([ObjectType])
GO
In the documents table there are 100k records.
This is the C# method which is fetching single document on the basis of objectid.
public IQueryable<Document> GetDocumentData(long objectId, string objectType)
{
var searchResults = new MerrickEntities().Documents.Where(c => c.ObjectId == objectId && c.ObjectType == objectType && SqlFunctions.DataLength(c.DocumentFile) > 0);
return searchResults.AsQueryable();
}
In this query is not fetching data and it seems the issue is caused by datalength function.
How can I optimize this query?

SQL Multiple meetings to one user and vice versa

I'm creating a meeting program in c# using SQL. How would i go about adding multiple users from the user table to one meeting and vice versa (multiple meetings to one user from the table)
Sorry I'm new to SQL
SQL DB Format: User
[UserID] VARCHAR (50) NOT NULL,
[FirstName] VARCHAR (50) NOT NULL,
[LastName] VARCHAR (50) NOT NULL,
[Username] VARCHAR (50) NOT NULL,
[Password] VARCHAR (50) NOT NULL,
[Exc1] BIT NULL,
[Exc2] BIT NULL,
[Exc3] BIT NULL,
[Exc4] BIT NULL,
[Exc5] BIT NULL,
[Importance] INT NOT NULL,
[Meetings] VARCHAR (50) NULL,
PRIMARY KEY CLUSTERED ([UserID] ASC),
CONSTRAINT [Meetings] FOREIGN KEY ([Meetings]) REFERENCES [dbo].[Meeting] ([MeetingID])
Meeting
[MeetingID] VARCHAR (50) NOT NULL,
[Title] VARCHAR (50) NOT NULL,
[Date] DATE NOT NULL,
[StartTime] TIME (7) NOT NULL,
[EndTime] TIME (7) NOT NULL,
[Location] VARCHAR (50) NOT NULL,
[Exc1] BIT NULL,
[Exc2] BIT NULL,
[Exc3] BIT NULL,
[Exc4] BIT NULL,
[Exc5] BIT NULL,
[Summary] VARCHAR (MAX) NULL,
[UserID] VARCHAR (50) NOT NULL,
PRIMARY KEY CLUSTERED ([MeetingID] ASC),
CONSTRAINT [UserID] FOREIGN KEY ([UserID]) REFERENCES [dbo].[Users] ([UserID])

In this case it is a n to n relation and you need an additional table like
usermeetings
[UsermeetingsID]
[UserID]
[MeetingID]
And you can remove the userid columns from meeting table and meetings columns from user table

How to access AspNetUsers table fields?

I want to implement a limited time period membership in asp.net MVC. For that, I manually introduced a new column ExpiryDate in the AspNetUsers table. When a new user registers itself this field will automatically generate an expiry date with the help of the getdate() method.
CREATE TABLE [dbo].[AspNetUsers] (
[Id] NVARCHAR (128) NOT NULL,
[Email] NVARCHAR (256) NULL,
[EmailConfirmed] BIT NOT NULL,
[PasswordHash] NVARCHAR (MAX) NULL,
[SecurityStamp] NVARCHAR (MAX) NULL,
[PhoneNumber] NVARCHAR (MAX) NULL,
[PhoneNumberConfirmed] BIT NOT NULL,
[TwoFactorEnabled] BIT NOT NULL,
[LockoutEndDateUtc] DATETIME NULL,
[LockoutEnabled] BIT NOT NULL,
[AccessFailedCount] INT NOT NULL,
[UserName] NVARCHAR (256) NOT NULL,
[RegisterDate ] DATETIME DEFAULT (getdate()) NULL,
[ExpiryDate] DATETIME DEFAULT (getdate()+(60)) NULL,
CONSTRAINT [PK_dbo.AspNetUsers] PRIMARY KEY CLUSTERED ([Id] ASC)
);
Now, I want to check that expiry date value everytime when that user tries to login. Where and what logic should I implement in my code?

How can I access data from my junction table?

I have created a junction table between two of my tables to create a many to many relationship between them.I am able to save data to them, but can't access that data again. This is written in MVC ASP.NET by the way.
My first table:
CREATE TABLE [dbo].[UserInfo] (
[Id] INT IDENTITY (1, 1) NOT NULL,
[FirstName] NVARCHAR (50) NULL,
[LastName] NVARCHAR (50) NULL,
[Email] NVARCHAR (256) NOT NULL,
[Image] VARBINARY (MAX) NULL,
[Approved] BIT NOT NULL,
[Color] NVARCHAR (10) NULL,
PRIMARY KEY CLUSTERED ([Id] ASC)
);
My second table:
CREATE TABLE [dbo].[Events] (
[Id] NVARCHAR (128) NOT NULL,
[Name] NVARCHAR (100) NOT NULL,
[StartDate] DATETIME NULL,
[EndDate] DATETIME NULL,
[Approved] BIT NOT NULL,
[room_id] INT NULL,
[color] NVARCHAR (10) NOT NULL,
[Owner] INT NULL,
PRIMARY KEY CLUSTERED ([Id] ASC),
CONSTRAINT [FK_Events_Rooms] FOREIGN KEY ([room_id]) REFERENCES [dbo].[Rooms] ([_key])
);
My junction table:
CREATE TABLE [dbo].[UserToEvent] (
[UserId] INT NOT NULL,
[EventId] NVARCHAR (128) NOT NULL,
CONSTRAINT [UserId_EventId_pk] PRIMARY KEY CLUSTERED ([UserId] ASC, [EventId] ASC),
CONSTRAINT [FK_User] FOREIGN KEY ([UserId]) REFERENCES [dbo].[UserInfo] ([Id]),
CONSTRAINT [FK_Event] FOREIGN KEY ([EventId]) REFERENCES [dbo].[Events] ([Id])
);
Code to add new relationship:
Event e = await db.Events.FindAsync(id);
string email = User.Identity.Name;
UserInfo user = db.UserInfoes.Where(x => x.Email == email).First();
user.Events.Add(e);
e.UserInfoes.Add(user);
db.Entry(user).State = EntityState.Modified;
db.Entry(e).State = EntityState.Modified;
await db.SaveChangesAsync();
Code to access relationship:
UserInfo user = await db.UserInfoes.FindAsync(id);
List<Events> events = user.Events;
I would expect events to be filled with all events associated with user, but it never has any events.

I have found a work-around which is sufficient to my needs. I added another attribute to my junction table, which then allowed me to access it within my controllers (Since there weren't only two primary keys). From here I was able to gather the data from it just like any other table. Not sure why the above method does not work however. I have used that method before without a hitch. If anyone has an answer, I would love to hear it.

SharePoint Foundation 2013 IMPORT\EXPORT dbo.allDocs file\files

I would like to import\export file from Sharepoint 2013 database via C#. Do you know how to do it? Because file in SharePoint is encrypted.
My question is: How import\export file in C# from SharePoint Foundation 2013 database?
CREATE SCRIPT [dbo].[AllDocs]
CREATE TABLE [dbo].[AllDocs](
[Id] [uniqueidentifier] NOT NULL,
[SiteId] [uniqueidentifier] NOT NULL,
[DirName] [nvarchar](256) NOT NULL,
[LeafName] [nvarchar](128) NOT NULL,
[Level] [tinyint] NOT NULL,
[ParentId] [uniqueidentifier] NOT NULL,
[DeleteTransactionId] [varbinary](16) NOT NULL,
[WebId] [uniqueidentifier] NOT NULL,
[ListId] [uniqueidentifier] NULL,
[DoclibRowId] [int] NULL,
[Type] [tinyint] NOT NULL,
[SortBehavior] [tinyint] NOT NULL,
[Size] [int] NULL,
[ETagVersion] AS (case when [InternalVersion] IS NULL then NULL else ([InternalVersion]+[BumpVersion]*(256))/(256) end),
[EffectiveVersion] AS (case when [InternalVersion] IS NULL then NULL else [InternalVersion]+[BumpVersion]*(256) end),
[InternalVersion] [int] NULL,
[ContentVersion] [int] NOT NULL,
[NextBSN] [bigint] NULL,
[MetadataNextBSN] [bigint] NULL,
[StreamSchema] [tinyint] NULL,
[HasStream] AS (case when [Type]=(0) AND ([DocFlags]&(256))=(256) AND [SetupPath] IS NULL OR [SetupPath] IS NOT NULL AND ([DocFlags]&(64))=(64) then (1) else (0) end),
[BumpVersion] [tinyint] NOT NULL,
[UIVersion] [int] NOT NULL,
[Dirty] AS (case when [BumpVersion]<>(0) then CONVERT([bit],(1)) else CONVERT([bit],(0)) end),
[ListDataDirty] [bit] NOT NULL,
[DocFlags] [int] NULL,
[ThicketFlag] [bit] NULL,
[CharSet] [int] NULL,
[ProgId] [nvarchar](255) NULL,
[TimeCreated] [datetime] NOT NULL,
[TimeLastModified] [datetime] NOT NULL,
[NextToLastTimeModified] [datetime] NULL,
[MetaInfoTimeLastModified] [datetime] NULL,
[TimeLastWritten] [datetime] NULL,
[SetupPathVersion] [tinyint] NOT NULL,
[SetupPath] [nvarchar](255) NULL,
[SetupPathUser] [nvarchar](255) NULL,
[CheckoutUserId] [int] NULL,
[DraftOwnerId] [int] NULL,
[CheckoutDate] [datetime] NULL,
[CheckoutExpires] [datetime] NULL,
[VersionCreatedSinceSTCheckout] [bit] NOT NULL,
[LTCheckoutUserId] AS (case when ([DocFlags]&(32))=(32) then [CheckoutUserId] end),
[CheckinComment] [nvarchar](1023) NULL,
[IsCheckoutToLocal] AS (case when ([DocFlags]&(512))=(512) then (1) else (0) end),
[VirusVendorID] [int] NULL,
[VirusStatus] [tinyint] NULL,
[VirusInfo] [nvarchar](255) SPARSE NULL,
[VirusInfoEx] [varbinary](max) NULL,
[MetaInfo] [dbo].[tCompressedBinary] NULL,
[MetaInfoSize] [int] NULL,
[MetaInfoVersion] [int] NOT NULL,
[UnVersionedMetaInfo] [dbo].[tCompressedBinary] NULL,
[UnVersionedMetaInfoSize] [int] NULL,
[UnVersionedMetaInfoVersion] [int] NULL,
[WelcomePageUrl] [nvarchar](260) NULL,
[WelcomePageParameters] [nvarchar](max) NULL,
[IsCurrentVersion] [bit] NOT NULL,
[AuditFlags] [int] NULL,
[InheritAuditFlags] [int] NULL,
[UIVersionString] AS ((CONVERT([nvarchar],[UIVersion]/(512))+'.')+CONVERT([nvarchar],[UIVersion]%(512))),
[ScopeId] [uniqueidentifier] NOT NULL,
[BuildDependencySet] [varbinary](max) NULL,
[ParentVersion] [int] NULL,
[ParentVersionString] AS ((CONVERT([nvarchar],[ParentVersion]/(512))+'.')+CONVERT([nvarchar],[ParentVersion]%(512))),
[TransformerId] [uniqueidentifier] NULL,
[ParentLeafName] [nvarchar](128) NULL,
[CtoOffset] [smallint] NULL,
[Extension] AS (case when charindex(N'.',[LeafName] collate Latin1_General_BIN)>(0) then right([LeafName],charindex(N'.',reverse([LeafName]) collate Latin1_General_BIN)-(1)) else N'' end),
[ExtensionForFile] AS (case when [Type]=(0) AND charindex(N'.',[LeafName] collate Latin1_General_BIN)>(0) then right([LeafName],charindex(N'.',reverse([LeafName]) collate Latin1_General_BIN)-(1)) else N'' end),
[ItemChildCount] [int] NOT NULL,
[FolderChildCount] [int] NOT NULL,
[FileFormatMetaInfo] [varbinary](max) NULL,
[FileFormatMetaInfoSize] [int] NOT NULL,
[FFMConsistent] [bit] NULL,
[ListSchemaVersion] [int] NULL,
[ClientId] [varbinary](16) NULL,
CONSTRAINT [AllDocs_ParentId] PRIMARY KEY CLUSTERED
(
[SiteId] ASC,
[DeleteTransactionId] ASC,
[ParentId] ASC,
[Id] ASC,
[Level] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = ON, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON, FILLFACTOR = 95) ON [PRIMARY]
) ON [PRIMARY] TEXTIMAGE_ON [PRIMARY]
I try use this:
1 Code:
-- To allow advanced options to be changed.
EXEC sp_configure 'show advanced options', 1
GO
-- To update the currently configured value for advanced options.
RECONFIGURE
GO
-- To enable the feature.
EXEC sp_configure 'xp_cmdshell', 1
GO
-- To update the currently configured value for this feature.
RECONFIGURE
GO
2 Code
DECLARE #Command VARCHAR(4000),
#FileID VARCHAR(128),
#MyFilename nvarchar(max)
DECLARE curFile CURSOR FOR -- Cursor for each image in table
SELECT DocId FROM [WSS_Content].[dbo].[DocStreams]
OPEN curFile
FETCH NEXT FROM curFile
INTO #FileID
WHILE (##FETCH_STATUS = 0) -- Cursor loop
BEGIN
-- Keep the bcp command on ONE LINE - SINGLE LINE!!! - broken up for presentation
SELECT #MyFilename = LeafName from [WSS_Content].[dbo].[AllDocs] WHERE Id = #FileID
SET #Command = 'bcp "SELECT Content from [WSS_Content].[dbo].[DocStreams] WHERE DocId = ''' +
#FileID + '''" queryout "C:\' +
#MyFilename+'" -T -n -Slocalhost -fC:\bcp.fmt'
PRINT #Command -- debugging
EXEC xp_cmdshell #Command -- Carry out image export to file from db table
FETCH NEXT FROM curFile
INTO #FileID
END -- cursor loop
CLOSE curFile
DEALLOCATE curFile
But I get error:

It`s simple to import\export file in C# because it's binary file SELECT Content from [WSS_Content].[dbo].[DocStreams]