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Xpand provides general compatibility with MySQL and MariaDB functionality, but does not guarantee compatibility with any particular version. For the purposes of third party tools, you can configure Xpand to display a specific version.

The value for the version variable will is a concatenation of mysql_version and clustrix_version. The value for mysql_version should be set according to your compatibility needs and the clustrix_version global variable is updated automatically on database upgrade. 

sql> select @@version;        
+---------------------------------+ 
| @@version
| +---------------------------------+
| 5.0.45-Xpand-5.3
| +---------------------------------+
1 row in set (0.00 sec)

Changing the value of mysql_version may cause your application’s behavior to change.

Global Variables

These are the global variables related to version.

NameDescriptionDefault Value
clustrix_version

Xpand software version 

<auto populated>
mysql_version

The reported MySQL server version

5.0.45

format_versionA version string indicating the version of the software when the cluster was initial created.<auto populated>
versionThe reported server version<auto populated>

Caveats to Version Compatibility

Replication from Xpand (Master) to MySQL (Slave) 

Xpand can replicate to the following versions of MySQL with the using the specified  values set for mysql_version on the Xpand master. See Using Xpand as a Replication Master for instructions on configuration. 


MySQL version (slave)
Xpand mysql_version (master)5.0.*5.55.65.7
5.0(tick)(tick)(tick)(tick)
5.5(tick)(tick)(tick)(tick)
5.6(error)(tick)(error)(error)
5.7(error)(error)(error)(error)

Replication from Xpand to Xpand is not affected by the value for mysql_version

JDBC compatibility

Changing the MySQL value contained in version can have an impact on JDBC behavior, as JDBC will read the version and attempt to use features accordingly. Xpand does not support the tx_read_only variable, which is used by JDBC when some specific MySQL values are set in version. The following chart outlines compatibility of Xpand with different values for version and versions of JDBC:


JDBC
version
5.0.45
version
5.6.38
version
5.6.4
version
5.6.45
version
5.6.5
5.1.32(tick)Not Supported(tick)Not SupportedNot Supported
5.1.36(tick)Not Supported(tick)Not SupportedNot Supported
5.1.37(tick)(tick)(tick)(tick)(tick)
5.1.40(tick)(tick)(tick)(tick)(tick)
5.1.41(tick)(tick)(tick)(tick)(tick)
5.1.43(tick)(tick)(tick)(tick)(tick)
5.4.44(tick)(tick)(tick)(tick)(tick)
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