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Poly. Base Setup Errors and Possible Solutions. Blog Authors: Murshed Zaman and Sumin Mohanan. Reviewer(s): Barbara Kess. Prologue. Poly. Base is a new feature in SQL Server 2. It was popularized by APS (Microsoft Analytics Platform System) and Azure SQL DW.

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Poly. Base allows access to relational and non- relational data from SQL Server using familiar T- SQL language. It allows you to run queries on external data that resides in Hadoop or Azure blob storage. Optionally, it can push query operations to Hadoop. But since the feature has connectivity to data that resides outside of SQL Server, like Hadoop, some of our customers have had situations for which it was necessary to involve engineering to understand and guide the situation to a successful installation and/or data access. The purpose of this document is to highlight some of these issues we have seen with various customers and the possible solutions. Keep in mind these are some of the errors that we have seen and mitigated. The error message you see, although it may look the same, may have a different solution.

The CREATE EXTERNAL TABLE DDL points to a directory (and not a specific file) and the directory contains files with different schemas. SSMS Error: Select query on the external table gives the following error: Msg 7. Level 1. 6, State 1. Line 1. 4Cannot execute the query “Remote Query” against OLE DB provider “SQLNCLI1. Query aborted– the maximum reject threshold (0 rows) was reached while reading from an external source: 1 rows rejected out of total 1 rows processed.(/nation/sensors. Column ordinal: 0, Expected data type: INT, Offending value: . The name of the first rejected file shows in SSMS with offending data types or values.

Possible Reason: The reason this error happens is because each file has different schema. The Poly. Base external table DDL when pointed to a directory recursively reads all the files in that directory.

When a column or data type mismatch happens, this error could be seen in SSMS. Possible Solution: If the data for each table consists of one file, then use the filename in the LOCATION section prepended by the directory of the external files. If there are multiple files per table, put each set of files into different directories in Azure Blob Storage and then you can point LOCATION to the directory instead of a particular file. The latter suggestion is the best practices recommended by SQLCAT even if you have one file per table. Example: Create External Table foo(col.

WITH (LOCATION=. Kerberos security is not enforced in Hadoop Cluster. SSMS Error: Select on the external table gives the following error: Msg 1. Level 1. 6, State 1, Line 5. EXTERNAL TABLE access failed due to internal error: . EXTERNAL TABLE access failed due to internal error: .

Check DWEngine Server Log to make sure you don’t see DMS disconnections after the restart. Customer Scenario: SQL Server 2. Hadoop cluster (Kerberos is not enabled). Poly. Base is configured to push computation to Hadoop cluster. The Journey Of Life Eternal Movie. Query: select count(*) from foo WITH (FORCE EXTERNALPUSHDOWN); SSMS Error: Msg 1. Level 1. 6, State 1, Line 1. EXTERNAL TABLE access failed due to internal error: .

Also make sure that pdw. DMS tries to read the whole file as one row since it cannot decode the row delimiter and runs into Java heap space error.

Possible Solution: Convert the file to UTF8 format since Poly. Base currently requires UTF8 format for text delimited files. Customer Scenario: Customer’s intention is to setup SQL Server 2. Poly. Base to connect to Azure Blob Storage. SSMS Error: Msg 1. Level 1. 6, State 1, Line 7. EXTERNAL TABLE access failed due to internal error: .

List of connectivity values and supported types can be found at https: //msdn. Customer Scenario: Trying to export data to Azure blob storage or Hadoop file system using Poly. Base with CREATE EXTERNAL TABLE AS SELECT (CETAS) syntax from SQL Server 2. SSMS Error: Msg 1. Level 1. 5, State 1, Line 1. Incorrect syntax near the keyword . If this statement is a common table expression, an xmlnamespaces clause or a change tracking context clause, the previous statement must be terminated with a semicolon.

Reason: CETAS is not a supported statement in SQL Server 2. Poly. Base. Solution: Create the external table first and then use INSERT INTO SELECT to export to the external location.

More details can be found at https: //msdn. Customer Scenario: SQL DW is setup to import data from Azure blob storage.

Create external table fails with the following message. SSMS Error: Msg 1. Level 1. 6, State 1, Line 3. External TABLE access failed due to internal error: . Java exception message: com. Storage. Exception: Server failed to authenticate the request.

Make sure the value of Authorization header is formed correctly including the signature.: Error . Make sure the value of Authorization header is formed correctly including the signature. SQL Server has been restarted after all the configuration changes. Poly. Base Engine and Poly. Base Data Movement services are running after restart.

SSMS Error: Data Source configured without job tracker location: org. File. System: Provider org. View. File. System could not be instantiated. Data Source configured with job tracker location: Error . Customer Scenario: SQL Server 2.

APS is setup with supported HDP Cluster. Queries without pushdown works but fails with the following message when . EXTERNAL TABLE access failed due to internal error: . An internal DMS error occurred that caused this operation to fail. Details: Exception: Microsoft.

Sql. Server. Data. Warehouse. Data. Movement. Workers. Dms. Sql. Native. Exception, Message: Sql. Native. Buffer. Reader. Run, error in Odbc.

Execute. Query: Sql. State: 4. 20. 00, Native. Error: 8. 68. 0, .

This configuration will force the name node to return a URI for the data nodes with the Hostname instead of the internal IP address.< property> < name> dfs. Customer Scenario: SQL Server 2. Poly. Base query on a directory with a large number of files (> 3. SSMS Error: Msg 1. Level 1. 6, State 1, Line 1. EXTERNAL TABLE access failed due to internal error: . Java exception message: GC overhead limit exceeded: Error .

Java exception message: Java heap space: Error . With a large number of files, this overhead becomes noticeable and can eventually consume all memory available to the JVM.

Possible Solution: Rearrange the data in multiple directories so that each directory contains a subset of files and then break down the query in multiple ones that operate on a part of the original path at a time and materialize the tables as SQL Server tables (before joining them). Example: Let’s assume your external table data is in the following location: Orders/file. We have seen this with 2 customers now and felt it was worth mentioning here.

SSMS Error: Msg 1. Level 1. 6, State 1, Line 1. Microsoft. Sql. Server. Data. Warehouse. Common. Error. Handling. Mpp.

Sql. Exception: EXTERNAL TABLE access failed due to internal error: . Java exception message: com. Malformed. Byte. Sequence.

Exception: Invalid byte 1 of 1- byte UTF- 8 sequence.: Error . These sources that has it’s own formatting and can produce unwanted/unprintable characters which when found in the configuration files will show error message as shown above.

Possible Solution: Open the files in a smart text editor (something other than notepad) and look for these characters and eliminate them. Restart the necessary services. Epilogue. This blog does not cover all the issues you can encounter when accessing data by using Poly. Base. We plan to revise this document regularly with additional scenarios for the benefit of the masses.

How I fixed “Could not load file or assembly . I did not pay much attention to it because they raise this concern every alternate day and when they re- run it the backup completes successfully. But when my team member showed me the error message in TDP, it looked different. Quickly glanced through the Add/Remove Programs applet and could not locate Native Client Tools for SQL Server 2. But without fire there will not be any smoke!

For sure someone had installed the Client Tools for SQL Server 2. DBA told me that the server was rebooted last night and could see many Error messages in the Event Log prior to that. Some smart guys had done the installation under the credentials of the Service Account! Well, it had to be fixed now else no backups for those databases. Since it was referring to Microsoft. Sql. Server. Smo of version 1. I looked for it in the Global Assembly Cache (GAC), under C: WINDOWSASSEMBLY.

But it was not listed there. The client tool assemblies for SQL Server 2. C: Program Files. Microsoft SQL Server. SDKAssemblies folder. This folder had only one file Microsoft. Sql. Server. Types.

This confirmed that the server was meddled with last night. I had two options to fix this issue. To install SQL Server 2.

SMO package from this link or to register the assemblies back into GAC manually. Since installing the SMO package does much more than putting back the assemblies, I chose to stay away from it. Instead planned to move the assemblies to GAC myself. From a working server which had SQL Server 2. SMO installed, I copied the following files to C: Program Files. Microsoft SQL Server. SDKAssemblies folder.

Microsoft. Sql. Server. Connection. Info. Microsoft. Sql. Server. Connection. Info. Extended. dll. Microsoft.

Sql. Server. Dmf. Adapters. dll. Microsoft. Sql. Server. Dmf. Microsoft. Sql. Server. Dmf. Sql. Clr. Wrapper. Microsoft. Sql. Server.

Management. Collector. Microsoft. Sql. Server. Management. Collector. Enum. dll. Microsoft. Sql. Server. Management. Sdk. Sfc. dll. Microsoft. Sql. Server. Policy.

Enum. dll. Microsoft. Sql. Server. Reg. Svr. Enum. dll. Microsoft. Sql. Server. Service. Broker. Enum. dll. Microsoft. Sql. Server. Smo. dll. Microsoft.

Sql. Server. Smo. Extended. dll. Microsoft. Sql. Server. Sql.

Enum. dll. Microsoft. Sql. Server. Sql. Wmi. Management. dll. Microsoft. Sql. Server. SString. dll. Microsoft. Sql. Server. Types. Microsoft. Sql. Server.

Wmi. Enum. dll. Microsoft. Sql. Server. Wmi. Enum. dll. Only copying these files is not sufficient, they need to registered. Unlike the other DLLs these files cannot be registered using regsvr. C: WINDOWSSYSTEM3.

They have to be moved into GAC using the gacutil. C: WINDOWSassembly. GAC folder and then registered using regasm. Net framework folder. From the command prompt registered these files one by one using the below command.

Now it was telling me that Microsoft. Sql. Server. Sql.

Clr. Provider assembly was missing. I had copied all the assemblies from the working server and registered them. This assembly was not available in the regular location. Where else this Microsoft. Sql. Server. Sql. Clr. Provider. dll could be?

The best place to look for was the C: WINDOWSASSEMBLY folder on the working server. The files in this folder cannot be copied using the Windows Explorer. They need to be copied from the command prompt.

After doing dir /s in the ASSEMBLY folder I was able to locate this file under C: WINDOWSassembly. GAC. Copied this file to the C: on that server and from there copied it to the C: Program Files.

Microsoft SQL Server. SDKAssemblies folder on the affected server. Then registered this file by following the process explained earlier.

Expecting few more surprises I opened the TDP GUI yet again. Ero Electronic Temperature Controller Manual Lfs. Not this time, I was in for a pleasant surprise! It had worked and TDP showed up the databases. It was great sense of accomplishment after 6.