Are temporary tables replicated?

Are temporary tables replicated?

Temporary tables are replicated except in the case where you stop the replica server (not just the replication threads) and you have replicated temporary tables that are open for use in updates that have not yet been executed on the replica.

Are temporary tables supported by MySQL?

MySQL has a feature to create a special table called a Temporary Table that allows us to keep temporary data. This table is visible and accessible only for the current session. MySQL deletes this table automatically as long as the current session is closed or the user terminates the connection.

How do I fix MySQL replication error?

To fix the replication error we follow the below steps.

1. First, we log into the MYSQL.
2. On the MySQL shell, we check the slave status.
3. For that, we stop the slave from replication, using the below command.
4. Next, we tell the slave to simply skip the invalid SQL query.
5. Again, we start the slave.

Are temp tables automatically dropped SQL?

Temporary tables are automatically dropped when they go out of scope, unless explicitly dropped by using DROP TABLE: A local temporary table created in a stored procedure is dropped automatically when the stored procedure is finished.

What is a temporary table in MySQL?

The temporary tables are session-specific tables that are created within the session. When the session closes, the table is dropped by itself. A temporary table exists within a session only; therefore, a table created by one session is not visible to another session.

How long does MySQL temporary table last?

Temporary tables were added in the MySQL Version 3.23. If you use an older version of MySQL than 3.23, you cannot use the temporary tables, but you can use Heap Tables. As stated earlier, temporary tables will only last as long as the session is alive.

How does MySQL replication work?

Replication works as follows: Whenever the master’s database is modified, the change is written to a file, the so-called binary log, or binlog. The slave has another thread, called the SQL thread, that continuously reads the relay log and applies the changes to the slave server.

What is MySQL replication?

MySQL replication is a process that enables data from one MySQL database server (the master) to be copied automatically to one or more MySQL database servers (the slaves). However, general principles of setting up the MySQL master-slave replication on the same machine are the same for all operating systems.

What happens if you don’t drop a temp table?

Failure to come up with a good “why not” isn’t good enough. if you do not drop the temp table, then call the dbo. MyProc again in the same session, you will get an exception thrown when the code tries to create the temp table again.

Do we need to drop temp tables?

If you are wondering why it is not required to drop the temp table at the end of the stored procedure, well, it is because when the stored procedure completes execution, it automatically drops the temp table when the connection/session is dropped which was executing it. Well, that’s it.

How do I view a temporary table in MySQL?

mysql> CREATE TEMPORARY TABLE t1 (c1 INT PRIMARY KEY) ENGINE=INNODB; Query INNODB_TEMP_TABLE_INFO to view the temporary table metadata. The TABLE_ID is a unique identifier for the temporary table. The NAME column displays the system-generated name for the temporary table, which is prefixed with “#sql”.

How to stop the replication thread in MySQL?

Use SHOW STATUS to check the value of the Slave_open_temp_tables variable. If the value is not 0, restart the replication SQL thread with START REPLICA | SLAVE SQL_THREAD and repeat the procedure later. When the value is 0, issue a mysqladmin shutdown command to stop the replica.

When to use temporary table and drop in replication mode?

In statement-based replication mode, CREATE TEMPORARY TABLE and DROP TEMPORARY TABLE statements cannot be used inside a transaction, procedure, function, or trigger when GTIDs are in use on the server (that is, when the enforce_gtid_consistency system variable is set to ON ).

When to replicate a drop table in MySQL?

The exception is that to enable correct removal of temporary tables at the end of a session, a replica always replicates a DROP TEMPORARY TABLE IF EXISTS statement, regardless of any exclusion rules that would normally apply for the specified table.

Why are nontemporary tables not logged in MySQL?

Statements that involve a mix of temporary and nontemporary tables are logged on the source only for the operations on nontemporary tables, and the operations on temporary tables are not logged. This means that there are never any temporary tables on the replica to be lost in the event of an unplanned shutdown by the replica.