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    Data Lake Analytics - Deprecated：SHOW

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    Data Lake Analytics - Deprecated：SHOW

    更新時間：Jul 06, 2024

    本文主要介紹在DDL下的SHOW文法以及相關文法樣本。

    SHOW SCHEMAS

    查詢使用者所有的schema（database）。

    • 文法：
      SHOW {SCHEMAS | DATABASES}
    [LIKE 'pattern']
    [EXTRA]
    • 樣本：
      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

    查詢當前schema下的表，在使用前，您必須先切換到對應的schema。文法如下：
    USE database_name
    樣本：
    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)
    通過SELECT DATABASE()查看當前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

    查看建表語句。

    • 文法：
      SHOW CREATE TABLE tbl_name
    • 樣本：
      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

    列出表的所有分區資訊。

    • 文法：
      SHOW PARTITIONS
    [database_name.]table_name
    • 樣本：
      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)
      支援指定分區進行過濾：
      SHOW PARTITIONS [database_name.]table_name [PARTITION(partition_spec)];
      樣本：
      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

    查詢使用者的查詢任務資訊。

    • 文法：
      SHOW QUERY_TASK [FOR UserName]
    [WHERE expr]
    [ORDER BY {col_name | expr}
      [ASC | DESC], ...]
    [LIMIT {[offset,] row_count | row_count OFFSET offset}]
    • 樣本：
      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)
      如果是主帳號登入，可以查詢其他客戶SQL執行記錄
mysql> show query_task  for your sun_account where  create_time > '2020-06-01'

    SHOW PROCESSLIST

    查看Server端中各個線程（串連）的運行情況。

    • 文法：
      show processlist
    • 樣本：
      mysql> show processlist\G

*************************** 1. row ***************************
       Id: 16777224            -- 線程（串連）Id
     User: oa_1xxxxxxxxxx7597c -- dla帳號 
     Host: 212.20.XX.XX:7320  -- 用戶端Ip和Port
       db: tpch_50x_text       -- 串連上綁定的Schema
  Command: SELECT              -- 當前SQL類型
     Time: 1                   -- SQL執行時間
    State: RUNNING             -- SQL狀態
     Info: select count(*) from lineitem   -- SQL語句
ProcessId: q201908070004sh0aa2bf4a0001009   -- ProcessId用於排查問題
1 row in set (0.08 sec)

    SHOW GRANTS

    查看帳號的許可權資訊。

    • 文法：
      show grants for <account_id>
    • 樣本：
      GRANT ALL ON *.* TO dla_p123456789 WITH GRANT OPTION
    說明 其中 ALL表示所有許可權，更多許可權資訊請參見GRANT。