How to understand the Oracle (as opposed to DB2) tables
I am a beginner and you need to ask a question.To determine the number of records in dba_jobs is 1.
Can I describe the table and find there are about
18 columns in the table.
Then I run a SELECT * on the table.
When I select, looks like it is printing on about 8 different records.
With only the MISC ENV field being filled.
How should I interpret it
Here are the commands I entered:
SQL > select count (*) from dba_jobs;
COUNT (*)
----------
1
SQL > describe dba_jobs;
Name Null? Type
----------------------------------------- -------- ----------------------------
JOB NOT NULL NUMBER
LOG_USER NOT NULL VARCHAR2 (30)
PRIV_USER NOT NULL VARCHAR2 (30)
SCHEMA_USER NOT NULL VARCHAR2 (30)
DATE OF LAST_DATE
LAST_SEC VARCHAR2 (8)
DATE OF THIS_DATE
THIS_SEC VARCHAR2 (8)
NOT NULL NEXT_DATE DATE
NEXT_SEC VARCHAR2 (8)
NUMBER OF TOTAL_TIME
VARCHAR2 (1) BROKEN
INTERVAL OF NOT NULL VARCHAR2 (200)
NUMBER OF FAILURES
WHAT VARCHAR2 (4000)
NLS_ENV VARCHAR2 (4000)
MISC_ENV RAW (32)
NUMBER OF THE INSTANCE
SQL > select * from dba_jobs;
JOB LOG_USER PRIV_USER
---------- ------------------------------ ------------------------------
SCHEMA_USER LAST_SEC THIS_SEC NEXT_DATE THIS_DATE LAST_DATE
------------------------------ --------- -------- --------- -------- ---------
NEXT_SEC TOTAL_TIME B
-------- ---------- -
INTERVAL OF
--------------------------------------------------------------------------------
CHESS
----------
WHAT
--------------------------------------------------------------------------------
NLS_ENV
--------------------------------------------------------------------------------
INSTANCE OF MISC_ENV
---------------------------------------------------------------- ----------
1 SYSMAN SYSMAN
JOB LOG_USER PRIV_USER
---------- ------------------------------ ------------------------------
SCHEMA_USER LAST_SEC THIS_SEC NEXT_DATE THIS_DATE LAST_DATE
------------------------------ --------- -------- --------- -------- ---------
NEXT_SEC TOTAL_TIME B
-------- ---------- -
INTERVAL OF
--------------------------------------------------------------------------------
CHESS
----------
WHAT
--------------------------------------------------------------------------------
NLS_ENV
--------------------------------------------------------------------------------
INSTANCE OF MISC_ENV
---------------------------------------------------------------- ----------
SYSMAN 20 APRIL 09 22:29:55 20 APRIL 09
JOB LOG_USER PRIV_USER
---------- ------------------------------ ------------------------------
SCHEMA_USER LAST_SEC THIS_SEC NEXT_DATE THIS_DATE LAST_DATE
------------------------------ --------- -------- --------- -------- ---------
NEXT_SEC TOTAL_TIME B
-------- ---------- -
INTERVAL OF
--------------------------------------------------------------------------------
CHESS
----------
WHAT
--------------------------------------------------------------------------------
NLS_ENV
--------------------------------------------------------------------------------
INSTANCE OF MISC_ENV
---------------------------------------------------------------- ----------
22:30:55 17989 N
JOB LOG_USER PRIV_USER
---------- ------------------------------ ------------------------------
SCHEMA_USER LAST_SEC THIS_SEC NEXT_DATE THIS_DATE LAST_DATE
------------------------------ --------- -------- --------- -------- ---------
NEXT_SEC TOTAL_TIME B
-------- ---------- -
INTERVAL OF
--------------------------------------------------------------------------------
CHESS
----------
WHAT
--------------------------------------------------------------------------------
NLS_ENV
--------------------------------------------------------------------------------
INSTANCE OF MISC_ENV
---------------------------------------------------------------- ----------
SYSDATE + 1 / (24 * 60)
JOB LOG_USER PRIV_USER
---------- ------------------------------ ------------------------------
SCHEMA_USER LAST_SEC THIS_SEC NEXT_DATE THIS_DATE LAST_DATE
------------------------------ --------- -------- --------- -------- ---------
NEXT_SEC TOTAL_TIME B
-------- ---------- -
INTERVAL OF
--------------------------------------------------------------------------------
CHESS
----------
WHAT
--------------------------------------------------------------------------------
NLS_ENV
--------------------------------------------------------------------------------
INSTANCE OF MISC_ENV
---------------------------------------------------------------- ----------
0
JOB LOG_USER PRIV_USER
---------- ------------------------------ ------------------------------
SCHEMA_USER LAST_SEC THIS_SEC NEXT_DATE THIS_DATE LAST_DATE
------------------------------ --------- -------- --------- -------- ---------
NEXT_SEC TOTAL_TIME B
-------- ---------- -
INTERVAL OF
--------------------------------------------------------------------------------
CHESS
----------
WHAT
--------------------------------------------------------------------------------
NLS_ENV
--------------------------------------------------------------------------------
INSTANCE OF MISC_ENV
---------------------------------------------------------------- ----------
EMD_MAINTENANCE. EXECUTE_EM_DBMS_JOB_PROCS();
JOB LOG_USER PRIV_USER
---------- ------------------------------ ------------------------------
SCHEMA_USER LAST_SEC THIS_SEC NEXT_DATE THIS_DATE LAST_DATE
------------------------------ --------- -------- --------- -------- ---------
NEXT_SEC TOTAL_TIME B
-------- ---------- -
INTERVAL OF
--------------------------------------------------------------------------------
CHESS
----------
WHAT
--------------------------------------------------------------------------------
NLS_ENV
--------------------------------------------------------------------------------
INSTANCE OF MISC_ENV
---------------------------------------------------------------- ----------
= "AMERICAN" NLS_TERRITORY NLS_LANGUAGE = 'AMERICA' NLS_CURRENCY = ' $' NLS_ISO_CURRENC
JOB LOG_USER PRIV_USER
---------- ------------------------------ ------------------------------
SCHEMA_USER LAST_SEC THIS_SEC NEXT_DATE THIS_DATE LAST_DATE
------------------------------ --------- -------- --------- -------- ---------
NEXT_SEC TOTAL_TIME B
-------- ---------- -
INTERVAL OF
--------------------------------------------------------------------------------
CHESS
----------
WHAT
--------------------------------------------------------------------------------
NLS_ENV
--------------------------------------------------------------------------------
INSTANCE OF MISC_ENV
---------------------------------------------------------------- ----------
Y = NLS_NUMERIC_CHARACTERS 'AMERICA' ='.,' NLS_DATE_FORMAT = "DD-MON-RR' NLS_DATE_LAN
JOB LOG_USER PRIV_USER
---------- ------------------------------ ------------------------------
SCHEMA_USER LAST_SEC THIS_SEC NEXT_DATE THIS_DATE LAST_DATE
------------------------------ --------- -------- --------- -------- ---------
NEXT_SEC TOTAL_TIME B
-------- ---------- -
INTERVAL OF
--------------------------------------------------------------------------------
CHESS
----------
WHAT
--------------------------------------------------------------------------------
NLS_ENV
--------------------------------------------------------------------------------
INSTANCE OF MISC_ENV
---------------------------------------------------------------- ----------
GUAGE = "AMERICAN" NLS_SORT = "BINARY".
JOB LOG_USER PRIV_USER
---------- ------------------------------ ------------------------------
SCHEMA_USER LAST_SEC THIS_SEC NEXT_DATE THIS_DATE LAST_DATE
------------------------------ --------- -------- --------- -------- ---------
NEXT_SEC TOTAL_TIME B
-------- ---------- -
INTERVAL OF
--------------------------------------------------------------------------------
CHESS
----------
WHAT
--------------------------------------------------------------------------------
NLS_ENV
--------------------------------------------------------------------------------
INSTANCE OF MISC_ENV
---------------------------------------------------------------- ----------
0102000000000000 0
JOB LOG_USER PRIV_USER
---------- ------------------------------ ------------------------------
SCHEMA_USER LAST_SEC THIS_SEC NEXT_DATE THIS_DATE LAST_DATE
------------------------------ --------- -------- --------- -------- ---------
NEXT_SEC TOTAL_TIME B
-------- ---------- -
INTERVAL OF
--------------------------------------------------------------------------------
CHESS
----------
WHAT
--------------------------------------------------------------------------------
NLS_ENV
--------------------------------------------------------------------------------
INSTANCE OF MISC_ENV
---------------------------------------------------------------- ----------
the results are probably just wraps around your screen.
maybe try to select fewer columns rather than ' *'.
If you use sqlplus, then you can type "set your comments on" and at the end of the results it will tell you how many rows are returned.
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