DLA的SHOW语法以及相关语法示例_云原生数据湖分析（文档停止维护）-阿里云帮助中心

SHOW SCHEMAS

查询用户所有的schema（database）。

语法：

SHOW {SCHEMAS | DATABASES}
    [LIKE 'pattern']
    [EXTRA]

示例：

mysql> show schemas;
+------------------+
| TABLE_SCHEMA     |
+------------------+
| tpch_string_100x |
| tpch_string_10x  |
| tpch_string_1x   |
+------------------+
3 rows in set (0.01 sec)

mysql> show schemas like 'tpch%';
+------------------+
| TABLE_SCHEMA     |
+------------------+
| tpch_string_100x |
| tpch_string_10x  |
| tpch_string_1x   |
+------------------+
3 rows in set (0.01 sec)

mysql> show schemas like 'tpch%' extra;
+--------------+------------------+------------------------------+
| CATALOG_NAME | TABLE_SCHEMA     | CREATOR_ID                   |
+--------------+------------------+------------------------------+
| hive         | tpch_string_100x | OA$oa_101302231286633637597c |
| hive         | tpch_string_10x  | OA$oa_101302231286633637597c |
| hive         | tpch_string_1x   | OA$oa_101302231286633637597c |
+--------------+------------------+------------------------------+
3 rows in set (0.01 sec)

SHOW TABLES

查询当前schema下的表，在使用前，您必须先切换到对应的schema。语法如下：

USE database_name

示例：

mysql> use tpch_string_1x;
Database changed

mysql> show tables;
+-------------------------+
| TABLE_NAME              |
+-------------------------+
| customer_avro_string    |
| customer_json_string    |
| customer_orc_string     |
| customer_parquet_string |
| customer_rcfile_string  |
| customer_text_string    |
+-------------------------+
6 rows in set (0.01 sec)

通过SELECT DATABASE()查看当前session的schema。

mysql> select database();
+----------------+
| database()     |
+----------------+
| tpch_string_1x |
+----------------+
1 row in set (0.00 sec)

mysql> show tables like 'cus%';
+-------------------------+
| TABLE_NAME              |
+-------------------------+
| customer_avro_string    |
| customer_json_string    |
| customer_orc_string     |
| customer_parquet_string |
| customer_rcfile_string  |
| customer_text_string    |
+-------------------------+
6 rows in set (0.01 sec)

SHOW CREATE TABLE

查看建表语句。

语法：
```
SHOW CREATE TABLE tbl_name
```

示例：

mysql> show create table customer_text_string\G
*************************** 1. row ***************************
Result: CREATE EXTERNAL TABLE `customer_text_string`(
  `c_custkey` int, 
  `c_name` string, 
  `c_address` string, 
  `c_nationkey` int, 
  `c_phone` string, 
  `c_acctbal` double, 
  `c_mktsegment` string, 
  `c_comment` string)
ROW FORMAT DELIMITED 
  FIELDS TERMINATED BY '|' 
STORED AS INPUTFORMAT 
  'org.apache.hadoop.mapred.TextInputFormat' 
OUTPUTFORMAT 
  'org.apache.hadoop.hive.ql.io.HiveIgnoreKeyTextOutputFormat'
LOCATION
'oss://acs:ram::111111111:role&aliyunopenanalyticsossfullaccessrole@test_bucket/datasets/tpch/1x/text_string/customer_text'
TBLPROPERTIES (
  'COLUMN_STATS_ACCURATE'='false', 
  'numFiles'='1', 
  'numRows'='-1', 
  'rawDataSize'='-1', 
  'totalSize'='24346144', 
  'transient_lastDdlTime'='1523448357')

1 row in set (0.38 sec)

SHOW PARTITIONS

列出表的所有分区信息。

语法：

SHOW PARTITIONS
    [database_name.]table_name

示例：

mysql> show partitions primitives_avro_p;
+--------------------------------------------------------------------------+
| Result                                                                   |
+--------------------------------------------------------------------------+
| year=2009/month=1
year=2009/month=2
year=2009/month=3
year=2009/month=4
 |
+--------------------------------------------------------------------------+
1 row in set (0.46 sec)

mysql> show partitions basic_test.primitives_avro_p;
+--------------------------------------------------------------------------+
| Result                                                                   |
+--------------------------------------------------------------------------+
| year=2009/month=1
year=2009/month=2
year=2009/month=3
year=2009/month=4
 |
+--------------------------------------------------------------------------+
1 row in set (0.67 sec)

支持指定分区进行过滤：

SHOW PARTITIONS [database_name.]table_name [PARTITION(partition_spec)];

示例：

mysql> show partitions primitives_avro_p partition(year='2009');
+--------------------------------------------------------------------------+
| Result                                                                   |
+--------------------------------------------------------------------------+
| year=2009/month=1
year=2009/month=2
year=2009/month=3
year=2009/month=4
 |
+--------------------------------------------------------------------------+
1 row in set (0.51 sec)

mysql> show partitions primitives_avro_p partition(month='3');
+--------------------+
| Result             |
+--------------------+
| year=2009/month=3
 |
+--------------------+
1 row in set (0.45 sec)

mysql> show partitions primitives_avro_p partition(year='2009',month='3');
+--------------------+
| Result             |
+--------------------+
| year=2009/month=3
 |
+--------------------+
1 row in set (0.46 sec)

SHOW QUERY_TASK

查询用户的查询任务信息。

语法：

SHOW QUERY_TASK [FOR UserName]
    [WHERE expr]
    [ORDER BY {col_name | expr}
      [ASC | DESC], ...]
    [LIMIT {[offset,] row_count | row_count OFFSET offset}]

示例：

mysql> show query_task where create_time > '2018-04-12' order by create_time desc limit 4, 1\G
*************************** 1. row ***************************
        TABLE_SCHEMA: tpch_string_1x
                  ID: e573ff53_1523547045897
              STATUS: SUCCESS
             MESSAGE: NULL
             COMMAND: select * from customer_text_string_2
          CREATOR_ID: OA$oa_101302231286633637597c
         CREATE_TIME: 2018-04-12 23:30:46.0
         UPDATE_TIME: 2018-04-12 23:30:46.0
           ROW_COUNT: 10000
         ELAPSE_TIME: 3017
  SCANNED_DATA_BYTES: 1630878
RESULT_FILE_OSS_FILE: oss://aliyun-oa-query-results-*****-oss-cn-hangzhou/*****/2018/4/12/20180412233042e573ff53000017/result.csv
    CANCELLABLE_TASK: 0
1 row in set (0.04 sec)

mysql> show query_task where id = 'e573ff53_1523547045897'\G
*************************** 1. row ***************************
        TABLE_SCHEMA: tpch_string_1x
                  ID: e573ff53_1523547045897
              STATUS: SUCCESS
             MESSAGE: NULL
             COMMAND: select * from customer_text_string_2
          CREATOR_ID: OA$oa_101302231286633637597c
         CREATE_TIME: 2018-04-12 23:30:46.0
         UPDATE_TIME: 2018-04-12 23:30:46.0
           ROW_COUNT: 10000
         ELAPSE_TIME: 3017
  SCANNED_DATA_BYTES: 1630878
RESULT_FILE_OSS_FILE:  oss://aliyun-oa-query-results-*****-oss-cn-hangzhou/*****/2018/4/12/20180412233042e573ff53000017/result.csv
    CANCELLABLE_TASK: 0
1 row in set (0.01 sec)

如果是主账号登录，可以查询其他客户SQL执行历史记录
mysql> show query_task  for your sun_account where  create_time > '2020-06-01'

SHOW PROCESSLIST

查看Server端中各个线程（连接）的运行情况。

语法：
```
show processlist
```

示例：

mysql> show processlist\G

*************************** 1. row ***************************
       Id: 16777224            -- 线程（连接）Id
     User: oa_1xxxxxxxxxx7597c -- dla账号 
     Host: 212.20.XX.XX:7320  -- 客户端Ip和Port
       db: tpch_50x_text       -- 连接上绑定的Schema
  Command: SELECT              -- 当前SQL类型
     Time: 1                   -- SQL执行时间
    State: RUNNING             -- SQL状态
     Info: select count(*) from lineitem   -- SQL语句
ProcessId: q201908070004sh0aa2bf4a0001009   -- ProcessId用于排查问题
1 row in set (0.08 sec)

SHOW GRANTS

查看账号的权限信息。

语法：
```
show grants for <account_id>
```

示例：

GRANT ALL ON *.* TO dla_p123456789 WITH GRANT OPTION

说明其中 ALL表示所有权限，更多权限信息请参见GRANT。