Merge pull request #47686 from xiedeyantu/add_marked_dropped_tables_doc

add marked_dropped_tables doc

docs/en/operations/system-tables/marked_dropped_tables.md

@@ -0,0 +1,37 @@
+---
+slug: /en/operations/system-tables/marked_dropped_tables
+---
+# marked_dropped_tables
+
+Contains information about tables that drop table has been executed but data cleanup has not been actually performed.
+
+Columns:
+
+-   `index` ([UInt32](../../sql-reference/data-types/int-uint.md)) — Index in marked_dropped_tables queue.
+-   `database` ([String](../../sql-reference/data-types/string.md)) — Database.
+-   `table` ([String](../../sql-reference/data-types/string.md)) — Table name.
+-   `uuid` ([UUID](../../sql-reference/data-types/uuid.md)) — Table uuid.
+-   `engine` ([String](../../sql-reference/data-types/string.md)) — Table engine name.
+-   `metadata_dropped_path` ([String](../../sql-reference/data-types/string.md)) — Path of table's metadata file in metadate_dropped directory.
+-   `table_dropped_time` ([DateTime](../../sql-reference/data-types/datetime.md)) — The time when the next attempt to remove table's data is scheduled on. Usually it's the table when the table was dropped plus `database_atomic_delay_before_drop_table_sec`
+
+**Example**
+
+The following example shows how to get information about marked_dropped_tables.
+
+``` sql
+SELECT *
+FROM system.marked_dropped_tables\G
+```
+
+``` text
+Row 1:
+──────
+index:                 0
+database:              default
+table:                 test
+uuid:                  03141bb2-e97a-4d7c-a172-95cc066bb3bd
+engine:                MergeTree
+metadata_dropped_path: /data/ClickHouse/build/programs/data/metadata_dropped/default.test.03141bb2-e97a-4d7c-a172-95cc066bb3bd.sql
+table_dropped_time:    2023-03-16 23:43:31
+```