Delete Documents from CosmosDB based on condition through Query Explorer - azure

Question

What's the query or some other quick way to delete all the documents matching the where condition in a collection?
I want something like DELETE * FROM c WHERE c.DocumentType = 'EULA' but, apparently, it doesn't work.
Note: I'm not looking for any C# implementation for this.

Answer 1

This is a bit old but just had the same requirement and found a concrete example of what #Gaurav Mantri wrote about.
The stored procedure script is here:
https://social.msdn.microsoft.com/Forums/azure/en-US/ec9aa862-0516-47af-badd-dad8a4789dd8/delete-multiple-docdb-documents-within-the-azure-portal?forum=AzureDocumentDB
Go to the Azure portal, grab the script from above and make a new stored procedure in the database->collection you need to delete from.
Then right at the bottom of the stored procedure pane, underneath the script textarea is a place to put in the parameter. In my case I just want to delete all so I used:
SELECT c._self FROM c
I guess yours would be:
SELECT c._self FROM c WHERE c.DocumentType = 'EULA'
Then hit 'Save and Execute'. Viola, some documents get deleted. After I got it working in the Azure Portal I switched over the Azure DocumentDB Studio and got a better view of what was happening. I.e. I could see I was throttled to deleting 18 a time (returned in the results). For some reason I couldn't see this in the Azure Portal.
Anyway, pretty handy even if limited to a certain amount of deletes per execution. Executing the sp is also throttled so you can't just mash the keyboard. I think I would just delete and recreate the Collection unless I had a manageable number of documents to delete (thinking <500).
Props to Mimi Gentz #Microsoft for sharing the script in the link above.
HTH

Answer 2

I want something like DELETE * FROM c WHERE c.DocumentType = 'EULA'
but, apparently, it doesn't work.
Deleting documents this way is not supported. You would need to first select the documents using a SELECT query and then delete them separately. If you want, you can write the code for fetching & deleting in a stored procedure and then execute that stored procedure.

Answer 3

I wrote a script to list all the documents and delete all the documents, it can be modified to delete the selected documents as well.
var docdb = require("documentdb");
var async = require("async");
var config = {
host: "https://xxxx.documents.azure.com:443/",
auth: {
masterKey: "xxxx"
}
};
var client = new docdb.DocumentClient(config.host, config.auth);
var messagesLink = docdb.UriFactory.createDocumentCollectionUri("xxxx", "xxxx");
var listAll = function(callback) {
var spec = {
query: "SELECT * FROM c",
parameters: []
};
client.queryDocuments(messagesLink, spec).toArray((err, results) => {
callback(err, results);
});
};
var deleteAll = function() {
listAll((err, results) => {
if (err) {
console.log(err);
} else {
async.forEach(results, (message, next) => {
client.deleteDocument(message._self, err => {
if (err) {
console.log(err);
next(err);
} else {
next();
}
});
});
}
});
};
var task = process.argv[2];
switch (task) {
case "listAll":
listAll((err, results) => {
if (err) {
console.error(err);
} else {
console.log(results);
}
});
break;
case "deleteAll":
deleteAll();
break;
default:
console.log("Commands:");
console.log("listAll deleteAll");
break;
}

Answer 4

And if you want to do it in C#/Dotnet Core, this project may help: https://github.com/lokijota/CosmosDbDeleteDocumentsByQuery. It's a simple Visual Studio project where you specify a SELECT query, and all the matches will be a) backed up to file; b) deleted, based on a set of flags.

Answer 5

create stored procedure in collection and execute it by passing select query with condition to delete. The major reason to use this stored proc is because of continuation token which will reduce RUs to huge extent and will cost less.

Answer 6

##### Here is the python script which can be used to delete data from Partitioned Cosmos Collection #### This will delete documents Id by Id based on the result set data.
Identify the data that needs to be deleted before below step
res_list = "select id from id_del"
res_id = [{id:x["id"]}
for x in sqlContext.sql(res_list).rdd.collect()]
config = {
"Endpoint" : "Use EndPoint"
"Masterkey" : "UseKey",
"WritingBatchSize" : "5000",
'DOCUMENTDB_DATABASE': 'Database',
'DOCUMENTDB_COLLECTION': 'collection-core'
};
for row in res_id:
# Initialize the Python DocumentDB client
client = document_client.DocumentClient(config['Endpoint'], {'masterKey': config['Masterkey']})
# use a SQL based query to get documents
## Looping thru partition to delete
query = { 'query': "SELECT c.id FROM c where c.id = "+ "'" +row[id]+"'" }
print(query)
options = {}
options['enableCrossPartitionQuery'] = True
options['maxItemCount'] = 1000
result_iterable = client.QueryDocuments('dbs/Database/colls/collection-core', query, options)
results = list(result_iterable)
print('DOCS TO BE DELETED : ' + str(len(results)))
if len(results) > 0 :
for i in range(0,len(results)):
# print(results[i]['id'])
docID = results[i]['id']
print("docID :" + docID)
options = {}
options['enableCrossPartitionQuery'] = True
options['maxItemCount'] = 1000
options['partitionKey'] = docID
client.DeleteDocument('dbs/Database/colls/collection-core/docs/'+docID,options=options)
print ('deleted Partition:' + docID)