Why can't I run this query in parallel?

DB version: 11.2.0.4

Platform: Oracle Linux 6.5

In my DB, a job with parallelism 5 as stats collection below works well. OEM, I confirm that the bottom congregate, stats job runs with 5 slave process.

exec dbms_stats.gather_table_stats (-)

ownname = > 'MEA ', -.

tabname = > "ORDER_DETAIL", -.

estimate_percent = > DBMS_STATS. AUTO_SAMPLE_SIZE, -.

Cascade = > TRUE;

method_opt = > 'for all THE COLUMNS of SIZE AUTO ', -.

degree = > 5);

Order_Detail is a table with 400 million records. I wanted to get a number of rows in this table. So, I tried to use parallelism as shown below.

But the process of slaves were not created. The SELECT query worked only with parallelism 1. I have this cofirmed of data in real-time to OEM and gv$ view px_session.

SQL > show parameter parallel_max_servers

VALUE OF TYPE NAME

------------------------------------ ----------- ------------------------------

PARALLEL_MAX_SERVERS around 3200

SQL > ALTER SESSION FORCE PARALLEL QUERY 5 PARALLELS;

Modified session.

SQL > ALTER SESSION enable parallel query.

Modified session.

SQL > select / * + PARALLEL (5) * / count (*) from ptms.order_detail;

-Also tried

Select / * + PARALLEL(ptms.order_detail,5) * / count (*) from ptms.order_detail;

-Also tried

ALTER SESSION ENABLE PARALLEL DML.

-Setting below must not be the cause. Right? ALTER SESSION command must take precedence over this setting. Right?

SQL > select table_name, DEGREE from dba_tables where owner = 'MEA' and table_name = "ORDER_DETAIL";

DEGREE OF TABLE_NAME

------------------------------  ----------------------------------------

ORDER_DETAIL 1

Have you tried the trick

SELECT / * + PARALLEL * / COUNT (*)...

Tags: Database

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