#### 15.20.6.6 Performing DML and DDL Statements on the Underlying InnoDB Table

 You can access the underlying `InnoDB` table (which is `test.demo_test` by default) through standard SQL interfaces. However, there are some restrictions:

* When querying a table that is also accessed through the **memcached** interface, remember that **memcached** operations can be configured to be committed periodically rather than after every write operation. This behavior is controlled by the [`daemon_memcached_w_batch_size`](innodb-parameters.html#sysvar_daemon_memcached_w_batch_size) option. If this option is set to a value greater than `1`, use [`READ UNCOMMITTED`](innodb-transaction-isolation-levels.html#isolevel_read-uncommitted) queries to find rows that were just inserted.

  ```
  mysql> SET SESSSION TRANSACTION ISOLATION LEVEL READ UNCOMMITTED;

  mysql> SELECT * FROM demo_test;
  +------+------+------+------+-----------+------+------+------+------+------+------+
  | cx   | cy   | c1   | cz   | c2        | ca   | CB   | c3   | cu   | c4   | C5   |
  +------+------+------+------+-----------+------+------+------+------+------+------+
  | NULL | NULL | a11  | NULL | 123456789 | NULL | NULL |   10 | NULL |    3 | NULL |
  +------+------+------+------+-----------+------+------+------+------+------+------+
  ```

* When modifying a table using SQL that is also accessed through the **memcached** interface, you can configure **memcached** operations to start a new transaction periodically rather than for every read operation. This behavior is controlled by the [`daemon_memcached_r_batch_size`](innodb-parameters.html#sysvar_daemon_memcached_r_batch_size) option. If this option is set to a value greater than `1`, changes made to the table using SQL are not immediately visible to **memcached** operations.

* The `InnoDB` table is either IS (intention shared) or IX (intention exclusive) locked for all operations in a transaction. If you increase [`daemon_memcached_r_batch_size`](innodb-parameters.html#sysvar_daemon_memcached_r_batch_size) and [`daemon_memcached_w_batch_size`](innodb-parameters.html#sysvar_daemon_memcached_w_batch_size) substantially from their default value of `1`, the table is most likely locked between each operation, preventing [DDL](glossary.html#glos_ddl) statements on the table.

