How to identify Which table is hashed

DB : 10.2.0.3
OS : AIX 6.1
I have a query that is using hash join. Below is the query and execution plan.
SELECT tj.jq_id jq_id        ,
        tj.ref_key1 ref_key1 ,
        tj.ref_key3 ref_key3 ,
        tj.ref_key2 ref_key2 ,
        tj.ref_key4 ref_key4 ,
        th.rcp_id rcp_id      ,
        th.tp_id tp_id        ,
        th.transmittal_no trno,
        status_flag           ,
        tj.ref_key5 ref_key5 ,
        TO_CHAR(tj.date_finished, 'DD-MM-YYYY HH:MI:SS PM') finished
FROM    transmittal_job_queues tj,
        transmittal_headers th
WHERE   tj.job_type_id          = :1
        AND tj.expiration_date IS NULL
        AND th.expiration_date IS NULL
        AND tj.ref_key1         = th.th_id
        AND ref_key2           IS NULL
        AND tj.status_flag     IN ('R', 'A')
ORDER BY status_flag,
        th.tp_id    ,
        tj.effective_date DESC
PLAN_TABLE_OUTPUT
Plan hash value: 1402657176
| Id | Operation           | Name                   | Rows | Bytes |TempSpc| Cost (%CPU)| Time     |
|   0 | SELECT STATEMENT    |                        | 18734 | 1335K|       | 10347   (2)| 00:02:05 |
|   1 | SORT ORDER BY      |                        | 18734 | 1335K| 3272K| 10347   (2)| 00:02:05 |
|* 2 |   HASH JOIN         |                        | 18734 | 1335K| 1184K| 10022   (2)| 00:02:01 |
|* 3 |    TABLE ACCESS FULL| TRANSMITTAL_JOB_QUEUES | 18570 |   961K|       | 1623   (2)| 00:00:20 |
|* 4 |    TABLE ACCESS FULL| TRANSMITTAL_HEADERS    | 1046K|    19M|       | 6739   (2)| 00:01:21 |
Query Block Name / Object Alias (identified by operation id):
   1 - SEL$1
   3 - SEL$1 / TJ@SEL$1
   4 - SEL$1 / TH@SEL$1
Predicate Information (identified by operation id):
   2 - access("TH"."TH_ID"=TO_NUMBER("TJ"."REF_KEY1"))
   3 - filter(("TJ"."STATUS_FLAG"='A' OR "TJ"."STATUS_FLAG"='R') AND
              "TJ"."JOB_TYPE_ID"=TO_NUMBER(:1) AND "REF_KEY2" IS NULL AND "TJ"."EXPIRATION_DATE" IS NULL)
   4 - filter("TH"."EXPIRATION_DATE" IS NULL)
Column Projection Information (identified by operation id):
   1 - (#keys=3) "STATUS_FLAG"[VARCHAR2,1], "TH"."TP_ID"[NUMBER,22],
       INTERNAL_FUNCTION("TJ"."EFFECTIVE_DATE")[7], "TJ"."JQ_ID"[NUMBER,22],
       "TJ"."REF_KEY1"[VARCHAR2,20], "TJ"."REF_KEY3"[VARCHAR2,20], "TJ"."REF_KEY2"[VARCHAR2,20],
       "TJ"."REF_KEY4"[VARCHAR2,90], "TH"."RCP_ID"[NUMBER,22], "TJ"."REF_KEY5"[VARCHAR2,20],
       "TH"."TRANSMITTAL_NO"[NUMBER,22], TO_CHAR(INTERNAL_FUNCTION("TJ"."DATE_FINISHED"),'DD-MM-YYYY
       HH:MI:SS AM')[22]
   2 - (#keys=1) "TJ"."JQ_ID"[NUMBER,22], "TJ"."REF_KEY1"[VARCHAR2,20],
       "REF_KEY2"[VARCHAR2,20], "TJ"."REF_KEY3"[VARCHAR2,20], "TJ"."REF_KEY4"[VARCHAR2,90],
       "TJ"."REF_KEY5"[VARCHAR2,20], "TJ"."STATUS_FLAG"[VARCHAR2,1], "TJ"."DATE_FINISHED"[DATE,7],
       "TJ"."EFFECTIVE_DATE"[DATE,7], "TH"."RCP_ID"[NUMBER,22], "TH"."TP_ID"[NUMBER,22],
       "TH"."TRANSMITTAL_NO"[NUMBER,22]
   3 - "TJ"."JQ_ID"[NUMBER,22], "TJ"."REF_KEY1"[VARCHAR2,20], "REF_KEY2"[VARCHAR2,20],
       "TJ"."REF_KEY3"[VARCHAR2,20], "TJ"."REF_KEY4"[VARCHAR2,90], "TJ"."REF_KEY5"[VARCHAR2,20],
       "TJ"."STATUS_FLAG"[VARCHAR2,1], "TJ"."DATE_FINISHED"[DATE,7], "TJ"."EFFECTIVE_DATE"[DATE,7]
   4 - "TH"."TH_ID"[NUMBER,22], "TH"."RCP_ID"[NUMBER,22], "TH"."TP_ID"[NUMBER,22],
       "TH"."TRANSMITTAL_NO"[NUMBER,22]
46 rows selected.
sys@TESTDB> select count(*) from TRANSMITTAL_JOB_QUEUES;
COUNT(*)
    586928
sys@TESTDB> select count(*) from TRANSMITTAL_HEADERS;
COUNT(*)
   1314095
sys@TESTDB> select sum(bytes)/1024/1024 from dba_segments where segment_name='TRANSMITTAL_JOB_QUEUES'
SUM(BYTES)/1024/1024
                65.5
sys@TESTDB> select sum(bytes)/1024/1024 from dba_segments where segment_name='TRANSMITTAL_HEADERS';
SUM(BYTES)/1024/1024
                 271I wanted to know, which table is hashed in memory among "TRANSMITTAL_JOB_QUEUES" & "'TRANSMITTAL_HEADERS" ?

Thanks, but is a thumb rule that smaller table will be hashed ?
Also, how can i be sure by seeing the executing plan that smaller table is hashed ?

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