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> System table containing logging entries with information about various blob storage operations such as uploads and deletes.

# system.blob_storage_log

<Info>
  **Querying in ClickHouse Cloud**

  The data in this system table is held locally on each node in ClickHouse Cloud. Obtaining a complete view of all data, therefore, requires the `clusterAllReplicas` function. See [here](/reference/system-tables/overview#system-tables-in-clickhouse-cloud) for further details.
</Info>

<h2 id="description">
  Description
</h2>

Contains logging entries with information about various blob storage operations such as uploads and deletes.

<h2 id="columns">
  Columns
</h2>

* `hostname` ([LowCardinality(String)](/reference/data-types/lowcardinality)) — Hostname of the server executing the query.
* `event_date` ([Date](/reference/data-types/date)) — Date of the event.
* `event_time` ([DateTime](/reference/data-types/datetime)) — Time of the event.
* `event_time_microseconds` ([DateTime64(6)](/reference/data-types/datetime64)) — Time of the event with microseconds precision.
* `event_type` ([Enum8('Upload' = 1, 'Delete' = 2, 'MultiPartUploadCreate' = 3, 'MultiPartUploadWrite' = 4, 'MultiPartUploadComplete' = 5, 'MultiPartUploadAbort' = 6, 'Read' = 7)](/reference/data-types/enum)) — Type of the event. Possible values: 'Upload', 'Delete', 'MultiPartUploadCreate', 'MultiPartUploadWrite', 'MultiPartUploadComplete', 'MultiPartUploadAbort', 'Read'
* `query_id` ([String](/reference/data-types/string)) — Identifier of the query associated with the event, if any.
* `thread_id` ([UInt64](/reference/data-types/int-uint)) — Identifier of the thread performing the operation.
* `thread_name` ([String](/reference/data-types/string)) — Name of the thread performing the operation.
* `disk_name` ([LowCardinality(String)](/reference/data-types/lowcardinality)) — Name of the associated disk.
* `bucket` ([String](/reference/data-types/string)) — Name of the bucket.
* `remote_path` ([String](/reference/data-types/string)) — Path to the remote resource.
* `local_path` ([String](/reference/data-types/string)) — Path to the metadata file on the local system, which references the remote resource.
* `data_size` ([UInt64](/reference/data-types/int-uint)) — Size of the data involved in the upload event.
* `elapsed_microseconds` ([UInt64](/reference/data-types/int-uint)) — Elapsed time for the operation, in microseconds.
* `error_code` ([Int32](/reference/data-types/int-uint)) — Error code of the operation. 0 if there was no error.
* `error` ([String](/reference/data-types/string)) — Error message associated with the event, if any.

<h2 id="example">
  Example
</h2>

Suppose a blob storage operation uploads a file, and an event is logged:

```sql theme={null}
SELECT * FROM system.blob_storage_log WHERE query_id = '7afe0450-504d-4e4b-9a80-cd9826047972' ORDER BY event_date, event_time_microseconds \G
```

```text theme={null}
Row 1:
──────
hostname:                clickhouse.eu-central1.internal
event_date:              2023-10-31
event_time:              2023-10-31 16:03:40
event_time_microseconds: 2023-10-31 16:03:40.481437
event_type:              Upload
query_id:                7afe0450-504d-4e4b-9a80-cd9826047972
thread_id:               2381740
disk_name:               disk_s3
bucket:                  bucket1
remote_path:             rrr/kxo/tbnqtrghgtnxkzgtcrlutwuslgawe
local_path:              store/654/6549e8b3-d753-4447-8047-d462df6e6dbe/tmp_insert_all_1_1_0/checksums.txt
data_size:               259
error:
```

In this example, upload operation was associated with the `INSERT` query with ID `7afe0450-504d-4e4b-9a80-cd9826047972`. The local metadata file `store/654/6549e8b3-d753-4447-8047-d462df6e6dbe/tmp_insert_all_1_1_0/checksums.txt` refers to remote path `rrr/kxo/tbnqtrghgtnxkzgtcrlutwuslgawe` in bucket `bucket1` on disk `disk_s3`, with a size of 259 bytes.

<h2 id="see-also">
  See also
</h2>

* [External Disks for Storing Data](/concepts/features/configuration/server-config/storing-data)