Feb
25

A better SHOW TABLE STATUS

From command line we have the entire MySQL server on hands (if we have privileges too of course) but we don’t have a overall overview, at this point the show table status command is every useful, or not?.

This is what we get when run show table status in a standard 80×25 terminal screen:

We can maximize the terminal window and decrease font size, but not all the time we need that lots of info. Some time ago I develop a stored procedure to get a global overview including functions and stored procedures. The result is pretty comprehensible:

call tools.sp_status(database());
+----------------------------+--------+-------+---------+-----------------+
| Table Name                 | Engine | Rows  | Size    | Collation       |
+----------------------------+--------+-------+---------+-----------------+
| actor                      | InnoDB | 200   | 0.03 Mb | utf8_general_ci |
| actor_info                 | [VIEW] | -     | -       | -               |
| address                    | InnoDB | 589   | 0.09 Mb | utf8_general_ci |
| category                   | InnoDB | 16    | 0.02 Mb | utf8_general_ci |
| city                       | InnoDB | 427   | 0.06 Mb | utf8_general_ci |
| country                    | InnoDB | 109   | 0.02 Mb | utf8_general_ci |
| customer                   | InnoDB | 541   | 0.12 Mb | utf8_general_ci |
| customer_list              | [VIEW] | -     | -       | -               |
| film                       | InnoDB | 1131  | 0.27 Mb | utf8_general_ci |
| film_actor                 | InnoDB | 5143  | 0.27 Mb | utf8_general_ci |
| film_category              | InnoDB | 316   | 0.08 Mb | utf8_general_ci |
| film_list                  | [VIEW] | -     | -       | -               |
| film_text                  | MyISAM | 1000  | 0.31 Mb | utf8_general_ci |
| inventory                  | InnoDB | 4673  | 0.36 Mb | utf8_general_ci |
| language                   | InnoDB | 6     | 0.02 Mb | utf8_general_ci |
| nicer_but_slower_film_list | [VIEW] | -     | -       | -               |
| payment                    | InnoDB | 15422 | 2.12 Mb | utf8_general_ci |
| rental                     | InnoDB | 15609 | 2.72 Mb | utf8_general_ci |
| sales_by_film_category     | [VIEW] | -     | -       | -               |
| sales_by_store             | [VIEW] | -     | -       | -               |
| staff                      | InnoDB | 1     | 0.09 Mb | utf8_general_ci |
| staff_list                 | [VIEW] | -     | -       | -               |
| store                      | InnoDB | 2     | 0.05 Mb | utf8_general_ci |
+----------------------------+--------+-------+---------+-----------------+
23 rows in set (0.04 sec)
 
+----------------------------+-----------+---------------------+
| Routine Name               | Type      | Comment             |
+----------------------------+-----------+---------------------+
| get_customer_balance       | FUNCTION  |                     |
| inventory_held_by_customer | FUNCTION  |                     |
| inventory_in_stock         | FUNCTION  |                     |
| film_in_stock              | PROCEDURE |                     |
| film_not_in_stock          | PROCEDURE |                     |
| rewards_report             | PROCEDURE |                     |
| customer_create_date       | TRIGGER   | On INSERT: customer |
| del_film                   | TRIGGER   | On DELETE: film     |
| ins_film                   | TRIGGER   | On INSERT: film     |
| payment_date               | TRIGGER   | On INSERT: payment  |
| rental_date                | TRIGGER   | On INSERT: rental   |
| upd_film                   | TRIGGER   | On UPDATE: film     |
+----------------------------+-----------+---------------------+
12 rows in set (0.04 sec)
 
Query OK, 0 rows affected (0.04 sec)

There is the procedure source code:

DELIMITER $$
DROP PROCEDURE IF EXISTS `tools`.`sp_status` $$
CREATE PROCEDURE `tools`.`sp_status`(dbname VARCHAR(50))
BEGIN 
-- Obtaining tables and views
(
    SELECT 
     TABLE_NAME AS `Table Name`, 
     ENGINE AS `Engine`,
     TABLE_ROWS AS `Rows`,
     CONCAT(
        (FORMAT((DATA_LENGTH + INDEX_LENGTH) / POWER(1024,2),2))
        , ' Mb')
       AS `Size`,
     TABLE_COLLATION AS `Collation`
    FROM information_schema.TABLES
    WHERE TABLES.TABLE_SCHEMA = dbname
          AND TABLES.TABLE_TYPE = 'BASE TABLE'
)
UNION
(
    SELECT 
     TABLE_NAME AS `Table Name`, 
     '[VIEW]' AS `Engine`,
     '-' AS `Rows`,
     '-' `Size`,
     '-' AS `Collation`
    FROM information_schema.TABLES
    WHERE TABLES.TABLE_SCHEMA = dbname 
          AND TABLES.TABLE_TYPE = 'VIEW'
)
ORDER BY 1;
-- Obtaining functions, procedures and triggers
(
    SELECT ROUTINE_NAME AS `Routine Name`, 
     ROUTINE_TYPE AS `Type`,
     '' AS `Comment`
    FROM information_schema.ROUTINES
    WHERE ROUTINE_SCHEMA = dbname
    ORDER BY ROUTINES.ROUTINE_TYPE, ROUTINES.ROUTINE_NAME
)
UNION
(
    SELECT TRIGGER_NAME,'TRIGGER' AS `Type`, 
    concat('On ',EVENT_MANIPULATION,': ',EVENT_OBJECT_TABLE) AS `Comment`
    FROM information_schema.TRIGGERS
    WHERE EVENT_OBJECT_SCHEMA = dbname
)
ORDER BY 2,1;
END$$
DELIMITER ;

To use in your place you must call as:

mysql> call tools.sp_status(database());

Note the stored procedure has created in tools database (you can use another db), the goal of this is to call that useful procedure from any database, and it receives the name of database as parameter because is not possible obtain the current database from inside of stored procedure.

I published that code on  MySQL custom show table status entry at forge.mysql.com.

Any ideas to improving the source code to make it more useful?

 

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9 Responses to A better SHOW TABLE STATUS

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