10.28 OPG_APIS.FIND_CLUSTERS_PREP

Format

OPG_APIS.FIND_CLUSTERS_PREP(
     edge_tab_name  IN VARCHAR2,
     wt_clusters    IN OUT VARCHAR2,
     wt_undir       IN OUT VARCHAR2,
     wt_cluas       IN OUT VARCHAR2,
     wt_newas       IN OUT VARCHAR2,
     wt_delta       IN OUT VARCHAR2,
     options        IN VARCHAR2 DEFAULT NULL);

Description

Prepares for running weakly connected components (WCC) cluster detection.

Parameters

edge_tab_name

Name of the property graph edge table.

wt_clusters

A working table holding the final vertex cluster mappings. This table has two columns (VID NUMBER, CLUSTER_ID NUMBER). Column VID stores the vertex ID values, and column CLUSTER_ID stores the corresponding cluster ID values. Cluster ID values are long integers that can have gaps between them.

If an empty name is specified, a new table will be generated, and its name will be returned.

wt_undir

A working table holding an undirected version of the graph.

wt_cluas

A working table holding current cluster assignments.

wt_newas

A working table holding updated cluster assignments.

wt_delta

A working table holding changes ("delta") in cluster assignments.

options

Additional settings for index creation.

Usage Notes

The property graph edge table must exist in the database.

Examples

The following example prepares for doing cluster detection in a property graph named mypg.

DECLARE
  wtClusters   varchar2(200);
  wtUnDir      varchar2(200);
  wtCluas      varchar2(200);
  wtNewas      varchar2(200);
  wtDelta      varchar2(200);
BEGIN
  opg_apis.find_clusters_prep('mypgGE$', wtClusters, wtUnDir,
      wtCluas, wtNewas, wtDelta, '');
  dbms_output.put_line('working tables names ' || wtClusters || ' '
|| wtUnDir || ' ' || wtCluas || ' '  || wtNewas    || ' '
|| wtDelta );
END;
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