GS_BLOCKLIST_QUERY

GS_BLOCKLIST_QUERY records job blocklist and exception information. This table uses unique_sql_id as the unique index to collect statistics on job exception information and record blocklist information. You can associate GS_BLOCKLIST_QUERY with GS_WLM_SESSION_INFO to obtain the query column and execution information of a job.

The schema of the GS_BLOCKLIST_QUERY system catalog is dbms_om.
The GS_BLOCKLIST_QUERY system catalog can be queried only in the postgres database. If it is queried in other databases, an error is reported.
The GS_BLOCKLIST_QUERY system catalog contains unique indexes, which are distributed on DNs in hash mode. The distributed column is unique_sql_id.
Generally, constant values are ignored during Unique SQL ID calculation in DML statements. However, constant values cannot be ignored in DDL, DCL, and parameter setting statements. A unique_sql_id may correspond to one or more queries.

GaussDB(DWS) also provides the GS_BLOCKLIST_QUERY view for querying job blocklist and exception information. This view can directly display the query column. This view depends on GS_WLM_SESSION_INFO. If the GS_WLM_SESSION_INFO table is large, the query may take a long time.

**Table 1** GS_BLOCKLIST_QUERY columns
Name	Type	Reference	Description
unique_sql_id	Bigint	N/A	Query ID generated based on the query parsing tree.
block_list	Boolean	N/A	Check whether a job is in the blocklist.
except_num	Integer	N/A	Query the number of job exceptions.
except_time	Timestamp	N/A	Query the time when the last job exception occurred.