GLOBAL_TXN_PROCESSES

Property	Description
Parameter type	Integer
Default value	`1`
Modifiable	`ALTER SYSTEM`
Range of values	`0` to `20`
Basic	No
Oracle RAC	Multiple instances can have different values.

GLOBAL_TXN_PROCESSES specifies the initial number of GTXn background processes (GTX0, ... GTX9 and GTXa, ... GTXj) per instance to support global (XA) transactions in an Oracle RAC environment.

If you want to disable the GTXn background processes, then you must set GLOBAL_TXN_PROCESSES to 0 in your parameter file. Setting this parameter to 0 will disable the XA support on an Oracle RAC database. Error ORA-55712 will be returned if you try to run XA transactions on an Oracle RAC database with this parameter set to zer0. You can change the setting to a nonzero value at runtime to turn on the support for XA.

GLOBAL_TXN_PROCESSES is useful for systems that process global (XA) transactions heavily. You do not need to specify a value for this parameter since Oracle Database automatically determines the number of processes and autotunes them, as necessary. GTXn background processes are only seen in an Oracle RAC environment.