Re: how to check if keys disabled?

Jacek Becla Tue, 03 May 2005 14:17:59 -0700

Victor Pendleton wrote:

Try show index from t1;
Show index from t2;


Hi Victor,

Nope, this does not help. t1 has key disabled, t1 enabled, and the result is the same:

mysql> show index from t1\G
*************************** 1. row ***************************
       Table: t1
  Non_unique: 0
    Key_name: PRIMARY
Seq_in_index: 1
 Column_name: x
   Collation: A
 Cardinality: 0
    Sub_part: NULL
      Packed: NULL
        Null:
  Index_type: BTREE
     Comment:
1 row in set (0.00 sec)

mysql> show index from t2\G
*************************** 1. row ***************************
       Table: t2
  Non_unique: 0
    Key_name: PRIMARY
Seq_in_index: 1
 Column_name: x
   Collation: A
 Cardinality: 0
    Sub_part: NULL
      Packed: NULL
        Null:
  Index_type: BTREE
     Comment:
1 row in set (0.00 sec)


cheers,
Jacek

-----Original Message----- From: Jacek Becla [mailto:[EMAIL PROTECTED] Sent: Tuesday, May 03, 2005 4:00 PM To: Jay Blanchard Cc: mysql@lists.mysql.com Subject: Re: how to check if keys disabled?

Jay

Are you sure? DESCRIBE tells me the table has an index, but not whether the index is enabled or not:

mysql> create table t1 (x int primary key);
Query OK, 0 rows affected (0.01 sec)

mysql> create table t2 (x int primary key);
Query OK, 0 rows affected (0.01 sec)

mysql> alter table t1 disable keys;
Query OK, 0 rows affected (0.00 sec)

mysql> describe t1;
+-------+---------+------+-----+---------+-------+
| Field | Type    | Null | Key | Default | Extra |
+-------+---------+------+-----+---------+-------+
| x     | int(11) | NO   | PRI |         |       |
+-------+---------+------+-----+---------+-------+
1 row in set (0.00 sec)

mysql> describe t2;
+-------+---------+------+-----+---------+-------+
| Field | Type    | Null | Key | Default | Extra |
+-------+---------+------+-----+---------+-------+
| x     | int(11) | NO   | PRI |         |       |
+-------+---------+------+-----+---------+-------+
1 row in set (0.00 sec)

Am I missing something?

thanks,
Jacek


Jay Blanchard wrote:

[snip]
How can I find out if keys are enabled/disabled for a given table?

Suppose I do:
create table t1 (x int primary key);
create table t2 (x int primary key);
alter table t1 disable keys;

How can I now find out that t1 has keys disabled, and t2 enabled?
[/snip]

DESCRIBE t1 or DESCRIBE t2

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