OBIEE11g: When UPDATE_TS Column has No Uniqueness, Dead Records May Be Left in the Event Polling Table
(Doc ID 2259323.1)
Last updated on MARCH 11, 2019
Applies to:
Business Intelligence Suite Enterprise Edition - Version 11.1.1.7.0 to 11.1.1.7.170418 [Release 11g]Information in this document applies to any platform.
Symptoms
Using event pooling tables to invalidate stale cache entries.
The DDL of BIPLATFORM schema for event polling table is S_NQ_EPT; and defined as following:
(
UPDATE_TYPE DECIMAL(10,0) DEFAULT 1 NOT NULL,
UPDATE_TS DATE DEFAULT SYSDATE NOT NULL,
DATABASE_NAME VARCHAR2(120) NULL,
CATALOG_NAME VARCHAR2(120) NULL,
SCHEMA_NAME VARCHAR2(120) NULL,
TABLE_NAME VARCHAR2(120) NOT NULL,
OTHER_RESERVED VARCHAR2(120) DEFAULT NULL NULL
) ;
UPDATE_TS column is defined DATE and default SYSDATE. This turns out that UPDATE_TS column with 1 second precision.
Often, there can be multiple inserts done to the polling table for cache purge marking at a sub-second level.
Example:
VALUES(default,default,'CA',NULL,'SH','TEST_A',null);
COMMIT;
INSERT INTO S_NQ_EPT(update_type,update_ts,database_name,catalog_name,schema_name,table_name,other_reserved)
VALUES(default,default,'CA',NULL,'SH','TEST_B',null);
COMMIT;
it could lead to dead records in the event polling table.
Like:
UPDATE_TYPE UPDATE_TS DATABASE_NAME CATALOG_NAME SCHEMA_NAME TABLE_NAME OTHER_RESERVED
1 2017-04-20 14:18:18 CA SH TEST_A instance1:coreapplication_obis1
1 2017-04-20 14:18:18 CA SH TEST_B instance1:coreapplication_obis1
1 2017-04-20 14:18:18 CA SH TEST_A
1 2017-04-20 14:18:18 CA SH TEST_B
Note: table_name is a different value in this case. When table_name has the same value, the records can be successfully cleared.
Cause
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In this Document
| Symptoms |
| Cause |
| Solution |