delete()

This operation deletes entities with a boolean expression.

Request Syntax

delete(
    expr: str, 
    partition_name: str | None, 
    timeout: float | None
)

PARAMETERS:

expr (string) -

__[REQUIRED] __

A boolean expression to filter the entities to delete.
partition_name (string) -

The name of partitions from which the matched entities are to be deleted.

If a partition is specified, only its entities are involved in filtering. Otherwise, all entities in the collection are involved.
timeout (float | None)

The timeout duration for this operation. Setting this to None indicates that this operation timeouts when any response arrives or any error occurs.

RETURN TYPE:

MutationResult

RETURNS:

A MutationResult object that contains the following fields:

insert_count (int)

The count of inserted entities.
delete_count (int)

The count of deleted entities.
upsert_count (int)

The count of upserted entities.
succ_count (int)

The count of successful executions during this operation.
succ_index (list)

A list of index numbers starting from 0, each indicating a successful operation.
err_count (int)

The count of failed executions during this operation.
err_index (list)

A list of index numbers starting from 0, each indicating a failed operation.
primary_keys (list)

A list of primary keys for the inserted entities.
timestamp (int)

The timestamp at which this operation is completed.

EXCEPTIONS:

MilvusException

This exception will be raised when any error occurs during this operation.

Examples

from pymilvus import Collection, CollectionSchema, FieldSchema, DataType

schema = CollectionSchema([
    FieldSchema("id", DataType.INT64, is_primary=True),
    FieldSchema("vector", DataType.FLOAT_VECTOR, dim=5)
])

# Create a collection
collection = Collection(
    name="test_collection",
    schema=schema
)

# Insert a list of columns
collection.insert(
    data=[
        [0,1,2,3,4],                         # id
        [                                    # vector
            [0.1,0.2,-0.3,-0.4,0.5],
            [0.3,-0.1,-0.2,-0.6,0.7],
            [-0.6,-0.3,0.2,0.8,0.7],
            [0.6,0.2,-0.3,-0.8,0.5],
            [0.3,0.1,-0.2,-0.6,-0.7],
        ],
    ]
)

# Delete two entities
res = collection.delete("id in [ 0, 1 ]")

Related operations

The following operations are related to delete():