The following are limitations specific to the
NDBCLUSTER
storage engine:
Machine architecture. The following issues relate to physical architecture of cluster hosts:
All machines used in the cluster must have the same architecture. That is, all machines hosting nodes must be either big-endian or little-endian, and you cannot use a mixture of both. For example, you cannot have a management node running on a PowerPC which directs a data node that is running on an x86 machine. This restriction does not apply to machines simply running mysql or other clients that may be accessing the cluster's SQL nodes.
Adding and dropping of data nodes. Online adding or dropping of data nodes is not currently possible. In such cases, the entire cluster must be restarted.
Backup and restore between architectures. It is also not possible to perform a Cluster backup and restore between different architectures. For example, you cannot back up a cluster running on a big-endian platform and then restore from that backup to a cluster running on a little-endian system. (Bug#19255)
Online schema changes.
It is not possible to make online schema changes such as
those accomplished using ALTER
TABLE
or CREATE
INDEX
, as the NDB Cluster
engine does not support autodiscovery of such changes.
(However, you can import or create a table that uses a
different storage engine, and then convert it to
NDB
using ALTER
TABLE
. In such a case, you must
issue a tbl_name
ENGINE=NDBCLUSTERFLUSH
TABLES
statement to force the cluster to pick up
the change.)
Binary logging. MySQL Cluster has the following limitations or restrictions with regard to binary logging:
sql_log_bin
has no
effect on data operations; however, it is supported for
schema operations.
MySQL Cluster cannot produce a binlog for tables having
BLOB
columns but no
primary key.
Only the following schema operations are logged in a cluster binlog which is not on the mysqld executing the statement:
See also Section 17.1.5.9, “Limitations Relating to Multiple MySQL Cluster Nodes”.
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