Suppose one has a column of words on which one builds a BTREE index: CREATE TABLE myTable ( words VARCHAR(25), INDEX USING BTREE (words) ); LOAD DATA LOCAL INFILE '/usr/share/dict/words' INTO ...
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. ...
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 ...
For example: CREATE TABLE test( col_1 INT, col_2 INT, col_3 VARCHAR(11), col_4 VARCHAR(11) )ENGINE = INNODB; CREATE INDEX mul ON test(col_2,col_3,col_4); Sorry,my English is not good,I mean ...
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 ...
I have noticed that even on huge tables with millions of records when I do a CREATE INDEX the index is created immediately (I get the console back in nsecs). Why is this? Doesn't it create the B-Tree ...