The transaction log for database 'tempdb' is full due to 'ACTIVE_TRANSACTION'

user_8359301 0
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I'm using Microsoft SQL Server 2014 and have run into some issues trying to create a temporary table. I've run this code once before with no issue, but when I tried to run the query today, I received one of two errors "There is already an object named '#AllClasses' in the database" or "The transaction log for database 'tempdb' is full due to 'ACTIVE_TRANSACTION'." I have pasted a part of the code below: 

    CREATE TABLE #AllClasses(studentId uniqueidentifier, ClassName nvarchar(100), SchoolName nvarchar(100), AcademicYearId uniqueidentifier, UserGroupId uniqueidentifier, SchoolId uniqueidentifier, ClassId uniqueidentifier,  UserGroupOrganizationStatusId tinyint);

    CREATE UNIQUE INDEX #I_AllClasses ON #AllClasses (StudentId, UserGroupId);

    INSERT #AllClasses(studentId, ClassName, SchoolName, AcademicYearId, UserGroupId, SchoolId, sc.ClassId, u.UserGroupOrganizationStatusId)

    SELECT sc.studentId, c.ClassName, u.UserGroupOrganizationName, c.AcademicYearId, c.UserGroupId, c.SchoolId, sc.ClassId, u.UserGroupOrganizationStatusId
    FROM StudentClassCrossReference sc
    INNER JOIN class c ON sc.ClassId = c.classId
    INNER JOIN School s ON s.SchoolId = c.SchoolId
    INNER JOIN dbo.UserGroupOrganization u ON u.UserGroupOrganizationId = s.UserGroupOrganizationId
    GROUP BY sc.studentId, c.classname, u.UserGroupOrganizationName, u.UserGroupOrganizationId, c.AcademicYearId, c.UserGroupId, c.SchoolId, sc.ClassId, u.UserGroupOrganizationStatusId
    HAVING u.UserGroupOrganizationStatusId = 0

When I try to drop the table, I get a new error which reads, "Cannot drop the table '#All Classes' because it does not exist or you do not have permission."

        DROP Table #LS25Student, #AllClasses, #LS25PageSession, #LS25PsByClass

And when I tried using an IF statement to drop the table, I received the error "The transaction log for 'tempdb' is full due to 'ACTIVE_TRANSACTION'." 

    IF OBJECT_ID('tempdb.dbo.#AllClasses', 'U') IS NOT NULL 
      DROP TABLE #AllClasses; 

    IF OBJECT_ID('tempdb.dbo.#LS25Student', 'U') IS NOT NULL 
      DROP TABLE #LS25Student;

    IF OBJECT_ID('tempdb.dbo.#LS25PageSession', 'U') IS NOT NULL 
      DROP TABLE #LS25PageSession;

    IF OBJECT_ID('tempdb.dbo.#LS25PsByClass', 'U') IS NOT NULL 
      DROP TABLE #LS25PsByClass;

I am able to run other queries without issue. Any suggestions to fix this particular query would be greatly appreciated.

sql-server sql
5 Answers

This error happens when you are doing onerous queries on the DB before a commit performs.

For example, if you try to make a subquery with some analytic calculations over a table with millions of records and then you make an update on it, the tempdb grows in dimensions (because of the necessary calculations) until it reaches the maximum dimensions, giving that error.

The possible solutions are:

  • Reduce the operations in segments wherever possible, for example making an update on a reduced set of rows (based on some keys)
  • Increase the dimensions of the tempdb (obviously if there's enough disk space)
user_60710450

I had the same problem and it went away when I had increased Log Size of 'tempdb' database (Initial Size). (you can use SSMS and choose Properties of 'tempdb' database)

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user_7694650

For me disconnecting from the db (right click on it in Object Explorer - Disconnect) and reconnecting again fixed the issue.

user_37314440
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