In our MySQL 5.5 database, we have following InnoDB table with 30M+ rows: +----------------+-------------+-----------------+--------+ | participant_id | question_id | given_answer_id | status | ...
I have a table (InnoDB) with data length around 36G and index length 23G. It had a composite primary key across three columns. As an initial attempt to reduce the size of this table, I dropped the ...
Mongo's ObjectID is defined like this: ObjectId is a 12-byte BSON type, constructed using: a 4-byte value representing the seconds since the Unix epoch, a 3-byte machine identifier, ...
I'm trying to build a aggregated reader website of multiple forums. Because most queries are likely to be within same time periods for written_time column, I'm thinking about taking advantage of ...
I am build a web application (project management system) and I have been wondering about this when it come to performance. I have an Issues table an inside it there are 12 foreign keys linking to ...
Can I have create an InnoDB table without a PK? If so, would a secondary index be used as the clustered index?
Is it possible to create an InnoDB table without a Primary Key? Since InnoDB tables are structured as clustered index around the PK, what would be the structure of a table without PK? Would that ...
I have a table with around 30 million rows in MySQL 5.5 using the InnoDB storage engine. This table has a foreign key that links to another table with around 3 million rows. I want to add a primary ...