MySQL transactional and non-transactional tables

When looking at the max_binlog_stmt_cache_size parameter explanation, there is such a sentence. If nontransactional statements within a transaction require more than this many bytes of memory, the server generates an error.

So, what are nontransactional statements?

Look for the nontransactional keyword at http://dev.mysql.com/, and the first one that comes out is Rollback Failure for Nontransactional Tables.

So what are Nontransactional Tables?

Nontransactional Tables, non-transactional tables, tables that do not support transactions, that is, tables that use the MyISAM storage engine.

The characteristic of non-transactional tables is that they do not support rollback. Looking at the following example

>create table no_trans(id int) ENGINE=MyiSAM;
>start transaction;
>insert into no_trans values(1);
>select * from no_trans;
+------+
| id   |
+------+
|    1 |
+------+
1 row in set (0.00 sec)
 
>rollback;
Query OK, 0 rows affected, 1 warning (0.00 sec)
 
>show warnings;
+---------+------+---------------------------------------------------------------+
| Level   | Code | Message                                                       |
+---------+------+---------------------------------------------------------------+
| Warning | 1196 | Some non-transactional changed tables couldn't be rolled back |
+---------+------+---------------------------------------------------------------+
1 row in set (0.00 sec)
 
>select * from no_trans;
+------+
| id   |
+------+
|    1 |
+------+
1 row in set (0.00 sec)

, you can see that the rollback of non-transactional tables throws a warning, indicating that non-transactional tables do not support rollback.

Compared with non-transaction table objects, transaction tables, such as tables using InnoDB, support rollback operations.

>create table trans(id int);
>start transaction;
>insert into trans values(1);
>select * from trans;
+------+
| id   |
+------+
|    1 |
+------+
1 row in set (0.00 sec)
 
 
>rollback;
Query OK, 0 rows affected (0.00 sec)
 
 
>select * from trans;
Empty set (0.00 sec)

It can be concluded that nontransactional statements mean statements that operate non-transactional tables.

max_binlog_stmt_cache_size This parameter affects non-transaction tables, such as MyISAM. If this parameter is not enough, it will prompt that more space is needed.

max_binlog_cache_size This parameter affects transaction tables, such as InnoDB. If this parameter is not enough, it will prompt that more space is needed.

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