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Antongig's avatar
Antongig
Frequent Visitor
1 year ago
Solved

Cannot Remove Invalid Table "_delta_log._commits" — SQL Sync Blocked

Hello, I'm experiencing a persistent issue in Microsoft Fabric Lakehouse.   Lakehouse: Silver_Lakehouse Issue: SQL Sync fails due to a phantom table _delta_log._commits. Error Message: Delta ta...
data warehouse
  • BhaveshPatel's avatar
    BhaveshPatel
    1 year ago

    Hi Antongig 

     

    Somewhere you deleted the transaction log file or data is corrupted due to _delta_log. For that, you need to delete the whole table ( single table ) and recreate the table using Python or scala commands which ever you think is relevant. 

     

    Also, Which database are you using as a source. I mean to say Azure SQL. SQL Server...etc. 

BhaveshPatel's avatar
BhaveshPatel
Icon for Super User rankSuper User
1 year ago

Hi Antongig 

 

Why do you need Silver Lakehouse??? Could you please explain the whole scenarios?

  • Antongig's avatar
    Antongig
    Frequent Visitor
    1 year ago

    Hi Bhavesh, thanks for replying!

    I use Silver_Lakehouse as part of a production data pipeline where:

    • Tables are copied from Bronze to Silver using Spark notebooks and pipelines

    • SQL sync is required for warehouse access and reporting

    • Several downstream reports and jobs depend on these tables

    The issue is that Fabric tries to sync a non-existent table _delta_log._commits, likely due to a failed write or interrupted notebook cell.
    I’ve tried:

    • Dropping the table via Spark SQL (DROP TABLE)

    • Deleting folders via file paths

    • Recreating and overwriting the table

    • Listing all tables (it doesn't appear)

    Nothing worked. Now SQL sync always fails.
    I cannot delete the Lakehouse easily because many pipelines and references are linked to it by name.

    Do you have any suggestion for clearing this ghost table or triggering a hard SQL sync refresh? 

    • BhaveshPatel's avatar
      BhaveshPatel
      Icon for Super User rankSuper User
      1 year ago

      Hi Antongig 

       

      Somewhere you deleted the transaction log file or data is corrupted due to _delta_log. For that, you need to delete the whole table ( single table ) and recreate the table using Python or scala commands which ever you think is relevant. 

       

      Also, Which database are you using as a source. I mean to say Azure SQL. SQL Server...etc. 

      • Antongig's avatar
        Antongig
        Frequent Visitor
        1 year ago

        The Lakehouse uses Delta Lake format underneath on OneLake storage. 

        I already tried deleting and recreating the table, but Fabric’s SQL sync still reports _delta_log._commits as a table, even though it doesn’t exist anymore. I tried:

        spark.sql("DROP TABLE IF EXISTS Silver_Lakehouse.`_delta_log._commits`")

        and I also tried:

        tables_path = "/lakehouse/default/Tables"
for i in os.listdir(tables_path):
    if "commits" in i:
        print(i)

        in my notebook in fabric. Both does absolutely nothing.

    • v-menakakota's avatar
      v-menakakota
      Icon for Community Support rankCommunity Support
      1 year ago

      Hi  Antongig  ,
      Thanks for reaching out to the Microsoft fabric community forum.
       

      You could try using the Lakehouse REST API to list all the tables in your Lakehouse sometimes it shows hidden or stuck entries that don’t appear with ShowTables.

      Look for the_delta_log._commits entry using the GET tables API call. If it shows up there, it means the metadata is still registered in the backend.

      Here’s the link to the API documentation which may help you:
      Lakehouse management API - Microsoft Fabric | Microsoft Learn

       

      If I misunderstand your needs or you still have problems on it, please feel free to let us know.   

      Best Regards,  
      Community Support Team 

      • Antongig's avatar
        Antongig
        Frequent Visitor
        1 year ago

        This solution did not work out as the get request via API showed only the tables I already could see in the fabric UI in the browser. So I have to create a ticket for microsoft support.