Linked Questions

245
votes
10answers
241k views

What are the main differences between InnoDB and MyISAM?

What are the main differences between InnoDB and MyISAM?
58
votes
3answers
63k views

What is the performance impact of using CHAR vs VARCHAR on a fixed-size field?

I have an indexed column that stores an MD5 hash. Thus, the column will always store a 32-character value. For whatever reason, this was created as a varchar rather than a char. Is it worth the ...
17
votes
3answers
16k views

Best of MyISAM and InnoDB

Is it possible to make InnoDB to use indexes same as MyISAM instead of clustered index due to limitation of RAM while getting benefit of its concurrency performance?
16
votes
3answers
18k views

Which DBMS is good for super-fast reads and a simple data structure?

I am developing a product that, as a part of it's operation, must track a large number of files/directories. The idea is to store stat information in a database then, on boot, create watches for each ...
10
votes
2answers
61k views

way to prevent queries from waiting for table level lock

We've encountered a problem after moving the database of our customer to an extra server. This should have had positive effects on the site's performance, but there is a problem with table locking in ...
4
votes
4answers
15k views

Optimized my.cnf for high-end and busy server

Curretly my main culprit of poor performance is MySQL and I'm not a DB savvy. So far, I've had little luck in optimizing mysql configs on my server, which has a Sandy Bridge processor with 16GB ram ...
7
votes
1answer
10k views

Do you still use MyISAM or prefer Aria storage engine?

If Aria storage engine (previously called Maria) is the "new" MyISAM, which supports transaction and automatic crash recovery: Why still use MyISAM ? Should changing storage engine from MyISAM to ...
11
votes
1answer
9k views

MySQL table with 100,000 records queried often

I have a single database of about 100 tables to store various kinds of information. The most important table is our order table which is used to store customers orders and is over 100000 records as ...
6
votes
3answers
7k views

InnoDB vs MyISAM with many indexes

I am not sure if there is a right or wrong answer to this question, as I suppose it severely depends on the situation, but for the sake of a mental exercise, I'll go ahead and ask it anyway: I have a ...
7
votes
1answer
7k views

When to switch from MyISAM to InnoDB?

We have a MySQL 5.0 server running all tables as MyISAM. We have two slaves that, in the last month, we have upgraded to MySQL 5.5. Their tables are also still MyISAM. My original plan was to upgrade ...
2
votes
1answer
17k views

MySQL Performance Tuning for MyISAM

I need to performance tune a mysql server and need help. I have a 16G server dedicated to MySQL with 1 MyISAM table with about 2 million rows that gets a significant amount of traffic. There are ...
3
votes
2answers
8k views

How does mysql decide if concurrent insert is possible for a MyISAM table?

For "concurrent inserts", MySQL reference manual has the following explanation: The MyISAM storage engine supports concurrent inserts to reduce contention between readers and writers for a given ...
5
votes
2answers
4k views

mysql transaction vs lock

I have a question regarding MySQL locking and transaction management. My Question is ..does mysql takes lock on the the tuple/table on which I am doing select/update in a transaction ?
3
votes
1answer
7k views

MySQL high CPU usage (MyISAM table indexes)

I have a problem with an inherited MySQL database. From time to time mysqld uses up to 2300% CPU.. The only solution is to service mysql stop and run an myisamchk -r on a table. After the indexes have ...
5
votes
2answers
2k views

Choosing MyISAM over InnoDB for these project requirements; and long term options

Sorry for the long post, but I had to give as much info as possible to make this very vague question more specific. My project's aim is to let users search a (huge) database of variety of products. ...

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