Consequence of the post auto incrementer off?

1. Why is auto increment bad?
2. What happens when auto increment reaches limit?
3. What will be the auto increment ID of delete?
4. What can I use instead of auto increment?
5. Should primary key always be auto increment?
6. Should I use auto increment?
7. How can change auto-increment after Delete in MySQL?
8. How update a column with auto-increment in SQL Server?
9. How can I change column auto-increment in SQL Server?
10. Is it safe to use UUID as primary key?
11. Should UUID be primary key?
12. Is it good to use UUID?

Why is auto increment bad?

Arguing that the auto incrementing Primary Keys are bad because they expose helpful information for spammers to navigate through company roles or groups as well as revealing the number of users or count of some other entity in the database are really not strong arguments against auto incrementing keys, which are more ...

What happens when auto increment reaches limit?

When the AUTO_INCREMENT column reaches the upper limit of data type then the subsequent effort to generate the sequence number fails. ... For example, if we will use TINYINT then AUTO_INCREMENT would be able to generate only 127 sequence numbers and in case of UNSIGNED TINYINT, this value can be extended up to 255.

What will be the auto increment ID of delete?

This simply means that the next insert into the table will have an ID that is one more then the previous one and therefore all ID's will be unique. However, if you delete a row from the table, the table will auto increment as if the row had not been deleted at all. The result is a gap in the sequence of numbers.

What can I use instead of auto increment?

TL;DR: Use UUID's instead of auto-increment, if you don't already have a unique way of identifying each row.

Should primary key always be auto increment?

In order to avoid such complexity and to ensure that the primary key is always unique, we can use MySQL's Auto increment feature to generate primary keys. Auto increment is used with the INT data type. The INT data type supports both signed and unsigned values. Unsigned data types can only contain positive numbers.

Should I use auto increment?

Auto-increment should be used as a unique key when no unique key already exists about the items you are modelling. So for Elements you could use the Atomic Number or Books the ISBN number.

How can change auto-increment after Delete in MySQL?

You can use a pair of statements: DROP TABLE and CREATE TABLE to reset the auto-increment column. Note that this method delete all data from the table permanently. Like the TRUNCATE TABLE statement, those statements drop the table and recreate it, therefore, the value of the auto-increment is reset to zero.

How update a column with auto-increment in SQL Server?

The MS SQL Server uses the IDENTITY keyword to perform an auto-increment feature. In the example above, the starting value for IDENTITY is 1, and it will increment by 1 for each new record. Tip: To specify that the "Personid" column should start at value 10 and increment by 5, change it to IDENTITY(10,5) .

How can I change column auto-increment in SQL Server?

ALTER TABLE Inventory MODIFY COLUMN item_number INT AUTO_INCREMENT=50; After running this code, future item IDs will start at an item_number of 50 and increment by 1. To change the starting increment value and increment in SQL Server, set your non-default values during table creation.

Is it safe to use UUID as primary key?

Primary keys should never be exposed, even UUIDs

A primary key is, by definition unique within its scope. It is, therefore, an obvious thing to use as a customer number, or in a URL to identify a unique page or row. Don't!

Should UUID be primary key?

Pros. Using UUID for a primary key brings the following advantages: UUID values are unique across tables, databases, and even servers that allow you to merge rows from different databases or distribute databases across servers. UUID values do not expose the information about your data so they are safer to use in a URL.

Is it good to use UUID?

The point of a UUID is to have a universally unique identifier. There's generally two reason to use UUIDs: You do not want a database (or some other authority) to centrally control the identity of records. There's a chance that multiple components may independently generate a non-unique identifier.