FILE Privilege

If you create a user called andrew:

 

UNIX > mysql -u root -p

Enter password:

Welcome to the MySQL monitor.  Commands end with ; or \g.

Your MySQL connection id is 45881

Server version: 5.0.67 Source distribution

 

Type 'help;' or '\h' for help. Type '\c' to clear the buffer.

 

mysql> create user 'andrew'@'localhost'

    -> identified by 'secret_password';

Query OK, 0 rows affected (0.00 sec)

 

mysql>

 

... and that user creates a table:

 

UNIX > mysql -u andrew -p

Enter password:

Welcome to the MySQL monitor.  Commands end with ; or \g.

Your MySQL connection id is 45883

Server version: 5.0.67 Source distribution

 

Type 'help;' or '\h' for help. Type '\c' to clear the buffer.

 

mysql> use test;

Reading table information for completion of table and column names

You can turn off this feature to get a quicker startup with -A

 

Database changed

mysql> create table andrews_table

    -> (col1 varchar(10));

Query OK, 0 rows affected (0.01 sec)

 

mysql> insert into andrews_table

    -> values ('Noddy');

Query OK, 1 row affected (0.00 sec)

 

mysql>

 

... then tries to output its contents into a file, it fails:

 

mysql> select * from andrews_table

    -> into outfile 'contents';

ERROR 1045 (28000): Access denied for user 'andrew'@'localhost' (using password: YES)

mysql>

 

To fix this, you need to grant the file privilege to the user:

 

UNIX > mysql -u root -p

Enter password:

Welcome to the MySQL monitor.  Commands end with ; or \g.

Your MySQL connection id is 45889

Server version: 5.0.67 Source distribution

 

Type 'help;' or '\h' for help. Type '\c' to clear the buffer.

 

mysql> grant file on *.* to andrew@localhost;

Query OK, 0 rows affected (0.00 sec)

 

mysql>

 

... then when the user tries again it works:

 

UNIX > mysql -u andrew -p

Enter password:

Welcome to the MySQL monitor.  Commands end with ; or \g.

Your MySQL connection id is 45890

Server version: 5.0.67 Source distribution

 

Type 'help;' or '\h' for help. Type '\c' to clear the buffer.

 

mysql> use test;

Reading table information for completion of table and column names

You can turn off this feature to get a quicker startup with -A

 

Database changed

mysql> select * from andrews_table

    -> into outfile 'contents';

Query OK, 1 row affected (0.00 sec)

 

mysql> exit

Bye

UNIX > 

 

and produces a file like this:

 

UNIX > cat contents

Noddy

UNIX >

MySQL BLACKHOLE Engine (again)

My previous post about this was run on a MySQL installation on UNIX. I decided to have another go using the MySQL on my home PC, which is installed on Windows XP. First I had a look for the have_blackhole_engine variable but I could not find it:
  

mysql> SHOW VARIABLES LIKE 'have_blackhole_engine';
Empty set (0.00 sec)

mysql>

But I decided to carry on and created a table using the BLACKHOLE engine:

mysql> use test

Database changed

mysql> create table andrew (col1 varchar(10));
Query OK, 0 rows affected (0.41 sec)

mysql> alter table andrew engine = blackhole;
Query OK, 0 rows affected (0.17 sec)
Records: 0  Duplicates: 0  Warnings: 0

mysql>

Then I inserted a row into the table and looked for it but it had gone so this time it had worked as expected:

mysql> insert into andrew values ('Fred');
Query OK, 1 row affected (0.00 sec)

mysql> select * from andrew;
Empty set (0.00 sec)

mysql>