pg_vcluster

System table pg_vcluster contains information about the virtual cluster(VC).pg_vcluster is a shared table.

In OushuDB, segment nodes can be devided into several VCs. In a virtual cluster, there are homogeneous multiple virtual computing cluster instances(VCI).pg_vcluster contains the definition of vcs and vcis.

Table 1. pg_catalog.pg_vcluster

column	type	references	description
vcname	name		name of vc/vci. Because one vci belongs to one vc, vci’s name likes ‘vcname@vciname’.
vcseg	text[]		only for vci. Ip or hostname of segment belongs to vci.
properties	text		properties of vc hash_table_bucket_number=”8”, max_nvseg_perquery=”512”, max_nvseg_perquery_perseg=”8”, enforce_nvseg=”0”, enforce_memory_pervseg=”0”, magma_hash_table_nvseg_perseg=”8”, nvseg_per_vci=”0”
ip	text		location of rm process
vcowner	oid		owner of vc
vcacl	aclitem[]		acl information of vc