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Published on 2010-03-23T13:58:01Z
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When will the below be necessary:
create index i_t_a_b on t(a,b);
create index i_t_b_a on t(b,a);
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I tried everything till now:
sudo apt-get remove mysql-server mysql-client mysql-common
sudo apt-get purge mysql-server mysql-client mysql-common
sudo apt-get autoremove
and even more commands...
But whenever I am trying to locate mysql. I get a no. of files related to mysql
command:
shell>>…
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Mysql was started:
/usr/bin/mysqld_safe --datadir=/srv/mysql/myDB --log-error=/srv/mysql/logs/mysqld-myDB.log --pid-file=/srv/mysql/pids/mysqld-myDB.pid --user=mysql --socket=/srv/mysql/sockets/mysql-myDB.sock --port=3700
but when I'm trying to do something:
ERROR 1548 (HY000) at line 1: Cannot…
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A client of my IT-consulting service owns a web-development shop. He's been having problems with a Slackware 12.0 server running MySQL 5.0.67. The machine was set up by the client's sysadmin, who left on bad terms. My client no longer employs a sysadmin.
As far as I can tell, the only copy of MySQL…
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Can't start mysql with:
sudo /usr/bin/mysqld_safe --datadir=/srv/mysql/myDB --log-error=/srv/mysql/logs/mysqld-myDB.log --pid-file=/srv/mysql/pids/mysqld-myDB.pid --user=mysql --socket=/srv/mysql/sockets/mysql-myDB.sock --port=3700
120222 13:40:48 mysqld_safe Starting mysqld daemon with databases…
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MySQL is one of the most popular database language and I have been recently working with it a lot. Data have no barrier and every database have their own place. I have been working with MySQL for quite a while and just like SQL Server, I often find lots of people asking me if I have a tutorial which…
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I've downloaded the employees database and executed some queries for benchmarking purposes.
Then I noticed that one query didn't use a covering index, although there was a corresponding index that I created earlier. Only when I added a FORCE INDEX clause to the query, it used a covering index.
I've…
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Hi,
I'm working on a database system and it's indexes, but I'm having a really hard time seing the clear difference between a covering index and a clustered index.
I've googled my way around but hasn't got a clear cut answer on:
What is the differences between the two types of indexes
When do…
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What is the diffrence between composite index and covering index in Sql Server ?
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When will the below be necessary:
create index i_t_a_b on t(a,b);
create index i_t_b_a on t(b,a);
>>> More
as seen on Stack Overflow
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When will the below be necessary:
create index i_t_a_b on t(a,b);
create index i_t_b_a on t(b,a);
>>> More
