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3
votes
4answers
3k views

Benefits of BTREE in MySQL

What are the pros and cons of using a BTREE index in MySQL, regarding query speed, disk storage and memory usage? Does BTREE provide easier iteration in increasing order ? What kind of queries would ...
2
votes
1answer
168 views

Character varying index overhead & length limit

I have a unique constraint on a character varying column that will mostly have lengths of approximately 600 but could get to 10 million. I have read about B-Trees, but I can't determine how much disk ...
3
votes
3answers
1k views

Optimizing DELETE Query on MySQL MEMORY Table

I run a large forum which maintains a MySQL database for backend data storage. The 'session' table tracks logged in users & guests. It is currently about 100k records, so not really that large. ...
1
vote
1answer
171 views

In MySQL if column X has unique values what's the difference between UNIQUE index and B-Tree index

Let's assume that I have table data: CREATE TABLE `test`.`data` ( `row_id` INT NOT NULL , `data_id` INT NOT NULL , PRIMARY KEY (`row_id`) ); Now, let's assume that data_id has unique values. Is ...