storage-engines

I'm using a mysql base to store results from various test over a large amount of data (hundred of millions recordings). I'm the only user of the base so there won't be any problem of concurrency. I also want to use simple mathematical functions such as 'avg', 'std' etc What is the best engine in your opinion for such a task? I'm using InnoDB right now and it seems to me a bit heavy. Regards Guillaume Using an InnoDB table comes with an overhead of transactional support, rollbacks etc. If you don't need this support for transactions then you should really go with an MyISam table as it doesn't

We have a currently running application which is using Mysql in multithreaded environment. We have approx 25 tables out of which 20 tables are using InnoDb as storage engine while 5 tables are using MyISAM as storage engine. We are going to change storage engine of these 5 tables to InnoDB. Will it cause some issue if change it during running application Any change you make with ALTER TABLE that requires a table-copy will lock the table. This is the most significant issue for applications. The table will be inaccessible from queries by any application. How long this lock lasts depends on the

Googling around just finds instructions for changing from one format to another, but I can't seem to find how exactly to make sure which of these I have first. How can I: Check what character encoding a table has? Check what storage engine a table uses? Check if all tables are certain encoding? Check if all tables have a certain storage engine? Nicola Cossu You can use information_schema in order to know the engine of each table. select table_name,engine from information_schema.tables where table_schema = 'your_database' For the encoding you can use show create table table_name or, even better

I just learned that Mysql has a Native CSV storage engine which stores data in a Comma Separated Value file per table. Is it possible to create a table directly from a uploaded CSV file, something like: CREATE TABLE USERS < PATH/USERS.CSV where users.csv is uploaded by the user? Shiplu Mokaddim This is not possible. To create table you need a table schema. What you have is a data file. Schema cannot be created with it. What you can do is check if your file has header row. In that case you can create table using that header row but manually. However there is a way to generate create table