storage-engines | 易学教程

See what storage engine MySQL database uses via terminal

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问题 Is there a command in terminal for finding out what storage engine my MySQL database is using? 回答1: This is available in a few places. From the SHOW CREATE TABLE output. mysql> SHOW CREATE TABLE guestbook.Guestbook; +-----------+-------------------------------------------+ | Table | Create Table | +-----------+-------------------------------------------+ | Guestbook | CREATE TABLE `Guestbook` ( `NAME` varchar(128) NOT NULL DEFAULT '', `MESSAGE` text NOT NULL, `TIMESTAMP` varchar(24) DEFAULT

When to use CSV storage engine for MySQL?

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问题 From the docs, it states: The CSV storage engine stores data in text files using comma-separated values format. What are the advantages of this? Here are some I can think of: You can edit the CSV files using simple text editor (however, you can export data easily using SELECT INTO OUTFILE ) Can be easily imported into Spreadsheet programs Lightweight and maybe better performance (wild guess) What are some disadvantages? No indexing Cannot be partitioned No transactions Cannot have NULL values

When to use CSV storage engine for MySQL?

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When to use CSV storage engine for MySQL?

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Django set Storage Engine & Default Charset

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问题 Creating my tables from my models.py . I donno how to do 2 things - I want to specify MySQL to create some of my tables as InnoDB & some as MyISAM . How do I do it? Also I want to specify my tables DEFAULT CHARSET as utf8 . How do I do it? This is what I see when I run syncdb - ... ) ENGINE=MyISAM DEFAULT CHARSET=latin1 I use Ubuntu 10.04, Django 1.2.X, MySQL 5.1.X UPDATE : I thought these might be MySQL default settings & I ended up changing my.cnf where I added default-character-set = utf8

How to check if MySQL table is UTF-8 and has storageEngine InnoDB?

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问题 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? 回答1: You can use information_schema in order to know the engine of each table. select table_name,engine from information_schema.tables where table

Fastest MySQL storage engine for storing data without concurrency

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问题 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 回答1: Using an InnoDB table comes with an overhead of transactional support, rollbacks etc. If

consequences of changing mysql storage engine while application is running in production

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问题 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 回答1: Any change you make with ALTER TABLE that requires a table-copy will lock the table. This is the most significant issue for

Laravel Schema Builder alter storage engine

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问题 I am trying to alter a table and change it's storage engine to InnoDb . When I run php artisan migrate it completes without error. However when I check the storage engine in Sequel Pro, nothing is changed. public function up() { Schema::table('tests', function(Blueprint $t) { $t->engine = 'InnoDB'; $t->foreign('group_id')->references('id')->on('test_groups')->onDelete('restrict'); }); } 回答1: Since @alexrussell confirmed my believe, I'm almost certain you can only define the storage engine

When to use CSV storage engine for MySQL?

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From the docs , it states: The CSV storage engine stores data in text files using comma-separated values format. What are the advantages of this? Here are some I can think of: You can edit the CSV files using simple text editor (however, you can export data easily using SELECT INTO OUTFILE ) Can be easily imported into Spreadsheet programs Lightweight and maybe better performance (wild guess) What are some disadvantages? No indexing Cannot be partitioned No transactions Cannot have NULL values Granted this (non-exhaustive) list of advantages and disadvantages, in what practical scenarios