add document for SHOW ANALYZE STATUS (#2856)

TOC.md

@@ -257,6 +257,7 @@
       + [`SET PASSWORD`](/sql-statements/sql-statement-set-password.md)
       + [`SET TRANSACTION`](/sql-statements/sql-statement-set-transaction.md)
       + [`SET [GLOBAL|SESSION] <variable>`](/sql-statements/sql-statement-set-variable.md)
+      + [`SHOW ANALYZE STATUS`](/sql-statements/sql-statement-show-analyze-status.md)
       + [`SHOW [BACKUPS|RESTORES]`](/sql-statements/sql-statement-show-backups.md)
       + [`SHOW CHARACTER SET`](/sql-statements/sql-statement-show-character-set.md)
       + [`SHOW COLLATION`](/sql-statements/sql-statement-show-collation.md)

sql-statements/sql-statement-show-analyze-status.md

@@ -0,0 +1,49 @@
+---
+title: SHOW ANALYZE STATUS
+summary: An overview of the usage of SHOW ANALYZE STATUS for the TiDB database。
+category: reference
+---
+
+# SHOW ANALYZE STATUS
+
+The `SHOW ANALYZE STATUS` statement shows the statistics collection tasks being executed by TiDB and a limited number of historical task records.
+
+## Synopsis
+
+**ShowStmt:**
+
+![ShowStmt](/media/sqlgram/ShowStmt.png)
+
+**ShowTargetFilterable:**
+
+![ShowTargetFilterable](/media/sqlgram/ShowTargetFilterable.png)
+
+## Examples
+
+{{< copyable "sql" >}}
+
+```sql
+create table t(x int, index idx(x)) partition by hash(x) partition 4;
+analyze table t;
+show analyze status;
+```
+
+```sql
++--------------+------------+----------------+-------------------+----------------+---------------------+----------+
+| Table_schema | Table_name | Partition_name | Job_info          | Processed_rows | Start_time          | State    |
++--------------+------------+----------------+-------------------+----------------+---------------------+----------+
+| test         | t          | p1             | analyze columns   |              0 | 2020-05-25 17:23:55 | finished |
+| test         | t          | p0             | analyze columns   |              0 | 2020-05-25 17:23:55 | finished |
+| test         | t          | p0             | analyze index idx |              0 | 2020-05-25 17:23:55 | finished |
+| test         | t          | p1             | analyze index idx |              0 | 2020-05-25 17:23:55 | finished |
+| test         | t          | p2             | analyze index idx |              0 | 2020-05-25 17:23:55 | finished |
+| test         | t          | p3             | analyze index idx |              0 | 2020-05-25 17:23:55 | finished |
+| test         | t          | p3             | analyze columns   |              0 | 2020-05-25 17:23:55 | finished |
+| test         | t          | p2             | analyze columns   |              0 | 2020-05-25 17:23:55 | finished |
++--------------+------------+----------------+-------------------+----------------+---------------------+----------+
+8 rows in set (0.00 sec)
+```
+
+## See also
+
+* [ANALYZE_STATUS table](/system-tables/system-table-information-schema.md#analyze_status-table)