1. Database Reference
  2. Initialization Parameters
  3. Initialization Parameters
  4. GCS_SERVER_PROCESSES

1.129 GCS_SERVER_PROCESSES

GCS_SERVER_PROCESSES specifies the number of background GCS server processes (LMS0, ... LMS9 and LMSa, ... LMSz) to serve the inter-instance traffic among Oracle RAC instances.

Property Description

Parameter type

Integer

Default value

If 1 - 3 CPUS, then 1

If 4 - 15 CPUs, then 2

If 16 or more CPUs, then 2 + (CPUs / 32). If the result includes a fraction, then the fraction is disregarded. For example, if you had 20 CPUs, then 2 + (20 / 32) would equal 2 GCS processes.Foot 1

If CLUSTER_DATABASE is set to false, then 0

If Oracle ASM, then 1

Modifiable

No

Modifiable in a PDB

No

Range of values

1 to 100

Basic

No

Oracle RAC

Multiple instances can have different values.

Footnote 1

On certain operating systems, the RDBMS optimizes the default allocation of background GCS server processes based on the core to thread ratio of the CPU.

GCS server processes are only seen in an Oracle RAC environment.