Preserving a GlobalID while moving data between Feature Classes

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09-29-2017 10:04 AM
alex_friant
Occasional Contributor II

The spirit of this post is to gather other people's solutions, discuss ways of improving the suggested solution, and track future ArcGIS capabilities as they evolve for this problem.

 

This all started because we had existing data in a GDB that contained a Relationship Class (RC) between a Feature Class  (FC) and a Table (TBL) using the FC's GlobalID field. We wanted to move that data into a new GDB that had a new schema (changes in domains, fields, etc.).

 

The problem is that when you Append the old data into the new schema, the GlobalID in the new schema is different than the records from the old data. This breaks the relationship between the FC and the related TBL.

UPDATE:

I have a much, MUCH, better solution that I discovered and it doesn't appear to be documented anywhere. All the text below that has strikethrough you shouldn't pay attention to, as it was the old, convoluted solution.

New Solution:

  1. Have your old data ready to load (your "loading" gdb - this is your source data)
  2. Have your empty geodatabase with the new schema. (your "new" gdb. It's okay that it has the "GlobalID" field, there is a new way to populate it with the GlobalID values from your loading geodatabase in ArcGIS Pro.)
  3. Open ArcGIS Pro
  4. Make sure your two geodatabases are added to the project (the "loading" gdb and the "new" gdb)
  5. Run the Append Tool
  6. Use your loading gdb feature class as the source, and your new gdb feature class as the target
  7. For the tool's Environment settings, make sure the "Preserve Global ID field" checkbox is checked
  8. In the Append tool's Field Mapping section, under the "Properties" tab, change the target feature class Data Type for the GlobalID field from "GlobalID" ---to----> "GUID". (I know, this seems strange. The data type is set in the target feature class schema as "GlobalID", but if you don't change this to GUID, then the GlobalID values from your source feature class will not migrate over to your new FC. If you change this setting to "GUID", they will magically migrate over to your new FC! I don't believe this is documented. If someone sees this documented anywhere, please share in the comments!)
  9. Repeat steps 4-8 for your related table.

Pay no attention:

After doing some searching, I discovered that there is a way to do this using and Enterprise Geodatabase (EGDB) and ArcGIS Pro.

 

I post my basic workflow here on how to preserve the FC's GlobalID values so that when you migrate the data over to the new schema, the GlobalID values stay the same in the new FC. This preserves the relationship between the FC and the TBL in the new schema.

 

Assumptions:

  • You have a FC you need to migrate to a new schema and would like to preserve the GlobalIDs.
  • You have access to an EGDB and ArcGIS Pro

 

Manual Steps:

  1. Copy the source FC (Feature Class) to an EGDB (Enterprise Geodatabase)
    1. Rename each class to have "_OLD" appended to them
      • Note: You might need to deal with differences in domains at this point if they have the same name but have different contents
      • You don't want your final domains to be appended with "_1". If so, then after you copy them over, you will need to turn off the domains where they are used, and delete them in the EGDB
      • This doesn't affect final product because this is only happening in the source data
  2. Prepare your new schema of your target FC to have a "GlobalID" that can be preserved:
    1. Take a copy of the FC empty schema
      1. Use X-Ray in ArcCatalog to remove the GlobalID field in the FC
      2. Create a new GDB using this new FC design
    2. Create a new "GlobalID" field manually (don't use the GP Toolbox) in the FC
      1. Use "GUID" datatype
      2. Do this in the FCL for the Global ID's that need to be preserved - this is normally only necessary on the FC where there is a oneway relationship
    3. Copy the FC to the EGDB
    4. In the newly copied FC in the EGDB…
      1. Create a new index for this new "GlobalID" field
      2. Make sure that it has "Unique" box checked, and "Ascending" too
  3. Append records from the OLD FC to the NEW FC using ArcGIS Pro's Append tool
    1. Add the FC's to an ArcGIS Pro project
    2. Run the Append tool
      1. Make sure to have the "Preserve GlobalID" box checked under Environments
      2. For "Schema Type", use the "Use the Field Map to reconcile schema differences" option

 

At this point, you can now copy/paste that new FC back to your location of choice, and rebuild the RC so that it connects up with the new TBL. It turns out that the GUID's used in the related table to relate back to the FC are naturally preserved by using the Append tool in ArcCatalog, so performing the workflow above on the related TBL is unnecessary. Even though the TBL's GlobalID (not GUID) values change when moving the data, that's doesn't matter to us because they aren't used to create the relationship.

 

We don't do this often so we aren't going to take efforts to automate it, but I assume that might be possible.

38 Replies
JohnWatson_EBA
New Contributor III

Alex, I don't believe I tried Kyle's solution. I ended up getting around my issue with a manual update (and using a Technician), but when I have some time to kill I will try his solution on another test dataset. Thanks.

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PaulDavidson1
Regular Contributor

Great idea and I like the overall concept when updating Hosted FClass. Definitely hHave to remember this one next time an update gives me grief which seems to be quite often

Thanks for sharing!!!

-Paul Davidson

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ScottSambell1
New Contributor II

Hi.  Trying to append features from a FGDB in Pro (2.6.0) to Hosted Feature Service on ArcGIS Online.  Tried everything in this thread with no luck.  Keep getting the same error

 WARNING 000594: Input feature 1: Function not implemented.  whenever the "Preserve GlobalIDs" box is ticked.  

Anyone come across this?  Or have a solution for preserving GlobalIDs when appending to AGOL Hosted Feature Layer?  Thanks.

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alex_friant
Occasional Contributor II

I never tested this out by using an AGOL HFL as my target. Let us know if you find a solution.

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erica_tefft
Occasional Contributor III

Hi Scott, 

I am running into this issue now. Did you ever find a solution? I'd been able to successfully use this workflow with HFL in the past, pre Pro 2.6. 

Erica

Erica
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ScottSambell1
New Contributor II

Unfortunately not.  

We have just resigned to the fact that it does not work and have created complex workarounds to grab the GlobalID from features once they are published.

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MingHome
New Contributor II

Can I publish feature layer/service from GDB/Pro to AGOL while preserve the GlobalID? If I use the GlobalID/GUID as the primary/foreign keys of relationship class, what will happen after I publish both feature class and related table to a AGOL feature service?

 

Thanks,

Ming

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erica_tefft
Occasional Contributor III

As long as your relationship is defined before publishing the data to AGOL, you should be fine and the relationship will remain. I am not sure if the GlobalID/GUID values will be the same as what you've got recorded in your local fGDB though - that's something I have never checked. 

Erica
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MingHome
New Contributor II

Thanks Erica!

Ming

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