How are temporary tables created in stored procedures?

How are temporary tables created in stored procedures?

If a local temporary table is created in a stored procedure or application that can be executed at the same time by several users, the Database Engine must be able to distinguish the tables created by the different users. The Database Engine does this by internally appending a numeric suffix to each local temporary table name.

When to use local and global temporary tables?

Local temporary tables are visible only in the current session, and global temporary tables are visible to all sessions. If a local temporary table is created in a stored procedure or application that can be executed at the same time by several users, the Database Engine must be able to distinguish the tables created by the different users.

Is it not possible to use temp table and execute it?

The problem is when I execute the stored procedure, an error message occurs: Cannot find the object “#tmpA” because it does not exist or you do not have permissions. Is it not possible to use temp table and execute it or did I do something wrong?

When to use @ temp tables in SQL Server?

Use @temp tables whenever possible–that is, you only need one primary key and you do not need to access the data from a subordinate stored proc.

Why are temporary tables bad for the database?

Temporary Tables are considered as regular database object, in terms of transaction handling and performance, therefore using many temporary tables in your stored procedures can lead to very poor database performance.

When to use a user defined datatype in tempdb?

You can use a user-defined datatype when creating a temporary table only if the datatype exists in TempDB. Stored procedures can reference temporary tables that are created during the current session. Within a stored procedure, you cannot create a temporary table, drop it, and then create a new temporary table with the same name.