cancel
Showing results for 
Search instead for 
Did you mean: 
Data Engineering
cancel
Showing results for 
Search instead for 
Did you mean: 

ADLS Gen 2 Delta Tables memory allocation

kkumar
New Contributor III

if i mount a gen2(ADLS 1) to another gen2(ADLS2) account and create a delta table on ADLS2 will it copy the data or just create something link External table.

i don't want to duplicate the the data.

2 REPLIES 2

youssefmrini
Honored Contributor III
Honored Contributor III

Hey You can't have have nested mounts.

Pat
Honored Contributor III

Hi @keerthi kumar​ ,

so basically you can CREATE EXTERNAL TABLES on top of the data stored somewhere - in your case ADLS. Data won't be copied, it will stay where it is, by creating external tables you are actually storing the metadata in your metastore (hive, unity catalog) - where the data is stored, table schema, partitions, etc.

Storing data and being able to query it with different engines it's called decoupling. Decoupling storage from compute allows you to manage cost of storage and compute separately.

Welcome to Databricks Community: Lets learn, network and celebrate together

Join our fast-growing data practitioner and expert community of 80K+ members, ready to discover, help and collaborate together while making meaningful connections. 

Click here to register and join today! 

Engage in exciting technical discussions, join a group with your peers and meet our Featured Members.