Join runs for > 10 hours and then fills up >1.3TB of disk space

Hi List;

I have a table with 9,961,914 rows in it (see the describe of
bigtab_stats_fact_tmp14 below)

I also have a table with 7,785 rows in it (see the describe of
xsegment_dim below)

I'm running the join shown below and it takes > 10 hours and
eventually runs out of disk space on a 1.4TB file system

I've included below a describe of both tables, the join and an explain
plan, any help / suggestions would be much appreciated !

I need to get this beast to run as quickly as possible (without
filling up my file system)

Thanks in advance...

select
f14.xpublisher_dim_id,
f14.xtime_dim_id,
f14.xlocation_dim_id,
f14.xreferrer_dim_id,
f14.xsite_dim_id,
f14.xsystem_cfg_dim_id,
f14.xaffiliate_dim_id,
f14.customer_id,
pf_dts_id,
episode_id,
sessionid,
bytes_received,
bytes_transmitted,
total_played_time_sec,
segdim.xsegment_dim_id as episode_level_segid
from
bigtab_stats_fact_tmp14 f14,
xsegment_dim segdim
where
f14.customer_id = segdim.customer_srcid
and f14.show_id = segdim.show_srcid
and f14.season_id = segdim.season_srcid
and f14.episode_id = segdim.episode_srcid
and segdim.segment_srcid is NULL;

QUERY PLAN
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Merge Join (cost=1757001.74..73569676.49 rows=3191677219 width=118)
Merge Cond: ((segdim.episode_srcid = f14.episode_id) AND
(segdim.customer_srcid = f14.customer_id) AND (segdim.show_srcid =
f14.show_id) AND (segdim.season_srcid = f14.season_id))
-> Sort (cost=1570.35..1579.46 rows=3643 width=40)
Sort Key: segdim.episode_srcid, segdim.customer_srcid,
segdim.show_srcid, segdim.season_srcid
-> Seq Scan on xsegment_dim segdim (cost=0.00..1354.85 rows=3643
width=40)
Filter: (segment_srcid IS NULL)
-> Sort (cost=1755323.26..1780227.95 rows=9961874 width=126)
Sort Key: f14.episode_id, f14.customer_id, f14.show_id, f14.season_id
-> Seq Scan on bigtab_stats_fact_tmp14 f14 (cost=0.00..597355.74
rows=9961874 width=126)
(9 rows)

# \d bigtab_stats_fact_tmp14
Table "public.bigtab_stats_fact_tmp14"
Column | Type | Modifiers
--------------------------+-----------------------------+-----------
pf_dts_id | bigint |
pf_device_id | bigint |
segment_id | bigint |
cdn_id | bigint |
collector_id | bigint |
digital_envoy_id | bigint |
maxmind_id | bigint |
quova_id | bigint |
website_id | bigint |
referrer_id | bigint |
affiliate_id | bigint |
custom_info_id | bigint |
start_dt | timestamp without time zone |
total_played_time_sec | numeric(18,5) |
bytes_received | bigint |
bytes_transmitted | bigint |
stall_count | integer |
stall_duration_sec | numeric(18,5) |
hiccup_count | integer |
hiccup_duration_sec | numeric(18,5) |
watched_duration_sec | numeric(18,5) |
rewatched_duration_sec | numeric(18,5) |
requested_start_position | numeric(18,5) |
requested_stop_position | numeric(18,5) |
post_position | numeric(18,5) |
is_vod | numeric(1,0) |
sessionid | bigint |
create_dt | timestamp without time zone |
segment_type_id | bigint |
customer_id | bigint |
content_publisher_id | bigint |
content_owner_id | bigint |
episode_id | bigint |
duration_sec | numeric(18,5) |
device_id | bigint |
os_id | bigint |
browser_id | bigint |
cpu_id | bigint |
xsystem_cfg_dim_id | bigint |
xreferrer_dim_id | bigint |
xaffiliate_dim_id | bigint |
xsite_dim_id | bigint |
xpublisher_dim_id | bigint |
season_id | bigint |
show_id | bigint |
xsegment_dim_id | bigint |
location_id | bigint |
zipcode | character varying(20) |
xlocation_dim_id | bigint |
location_srcid | bigint |
timezone | real |
xtime_dim_id | bigint |
Indexes:
"bigtab_stats_fact_tmp14_idx1" btree (customer_id)
"bigtab_stats_fact_tmp14_idx2" btree (show_id)
"bigtab_stats_fact_tmp14_idx3" btree (season_id)
"bigtab_stats_fact_tmp14_idx4" btree (episode_id)

# \d xsegment_dim
Table "public.xsegment_dim"
Column | Type |
Modifiers
----------------------+-----------------------------
+-------------------------------------------------------------
xsegment_dim_id | bigint | not null default
nextval('xsegment_dim_seq'::regclass)
customer_srcid | bigint | not null
show_srcid | bigint | not null
show_name | character varying(500) | not null
season_srcid | bigint | not null
season_name | character varying(500) | not null
episode_srcid | bigint | not null
episode_name | character varying(500) | not null
segment_type_id | integer |
segment_type | character varying(500) |
segment_srcid | bigint |
segment_name | character varying(500) |
effective_dt | timestamp without time zone | not null default
now()
inactive_dt | timestamp without time zone |
last_update_dt | timestamp without time zone | not null default
now()
Indexes:
"xsegment_dim_pk" PRIMARY KEY, btree (xsegment_dim_id)
"seg1" btree (customer_srcid)
"seg2" btree (show_srcid)
"seg3" btree (season_srcid)
"seg4" btree (episode_srcid)
"seg5" btree (segment_srcid)
"xsegment_dim_ix1" btree (customer_srcid)