I need to complex Query - need big support

Hi All,
I have been fine-tuning this below query. There are four large tables
earlier it was choosing "Merge-join" but i have vacuumed and analyzed then
now it is choosing "nested loop join" also i created composite key index to
optimize it but the index is not taking it.

i could see very low improvement from 27 minutes into 13+ minutes now.
Could you please someone suggest me to improve this query .

this data has been migrated from AWS redshift into AWS Aurora (postgreSQL )
DB.

explain select distinct
cth.contact_id cntct_id,
cth.activity_datetime actn_dt_tm,
cth.record_update_datetime updt_ts,
cth.transaction_status_id trans_status_id,
cts.session_id sessn_id,
utm_content_text,
utm_campaign_text,
utm_mdm_text,
utm_source_text,
utm_trm_text,
email_address,
ssr.source_system_code src_sys_cd,
ssr.source_system_name,
c.mdm_contact_id,
first_name,
last_name,
ttl.global_lov_code title,
sih.Linkedin lnkdn_txt,
sih.twitter twtr_txt,
sih.skype skpe_txt,
sih.facebook fcbk_txt,
organization_name,
organization_size,
job_title,
organization_business_volume,
ph.income_currency_id,
ph.nationality_id,
ph.mdm_person_id mdm_prsn_id,
sr.series_code,
er.edition_code evnt_edtn_cd,
br.brand_code,
cth.record_update_datetime cth_ts,
c.record_update_datetime c_ts,
ph.record_update_datetime ph_ts,
ctt.record_update_datetime ctt_ts,
cts.record_update_datetime cts_ts,
ph.record_insert_datetime ph_its
from core2020.contact_transaction_history_1521_BKP_AM cth
join core2020.contact_1521_BKP_AM c on c.contact_id = cth.contact_id
join core2020.person_history_1521_BKP_AM ph on ph.mdm_person_id =
c.mdm_contact_id
join core2020.contact_transaction_track_1521_BKP_AM ctt on
cth.contact_transaction_id = ctt.contact_transaction_id
join core2020.contact_transaction_session_1521_BKP_AM cts on
ctt.contact_transaction_track_id = cts.contact_transaction_track_id
join reference2020.edition_reference2020 er on cth.edition_id =
er.edition_id
join reference2020.series_reference2020 sr on er.series_id = sr.series_id
join reference2020.brand_reference2020 br on sr.brand_id = br.brand_id
join reference2020.source_system_reference2020 ssr on cth.source_system_id
= ssr.source_system_id
join reference2020.relationship_reference2020 rr on ctt.relationship_id
=rr.relationship_id
left join (select * from reference2020.global_lov_reference2020 where
global_lov_name='TITLE') ttl on ttl.global_lov_id = salutation_id
left join (select mdm_contact_id,
max (CASE WHEN ref.global_lov_value='Linkedin' THEN social_detail
ELSE null END) AS Linkedin,
Max (CASE WHEN ref.global_lov_value='Twitter' THEN social_detail
ELSE null END) AS Twitter,
Max (CASE WHEN ref.global_lov_value='Skype' THEN social_detail ELSE
null END) AS Skype,
Max (CASE WHEN ref.global_lov_value='Facebook' THEN social_detail
ELSE null END) AS Facebook
from core2020.contact_social_information_1521_BKP_AM si
inner join (select * from reference2020.global_lov_reference2020
where global_lov_name = 'MEDIA_SOCIAL_INFORMAION') ref on
si.social_information_type_id =ref.global_lov_id
where status='Active'
group by mdm_contact_id) sih on ph.mdm_person_id =
sih.mdm_contact_id
where rr.relationship_code = 'ER_SP'
and ssr.source_system_code = 'SS_AEM'
and er.event_end_date >= '2020-12-18'
and ((c.record_update_datetime > '2020-12-18T08:35:34' and
c.record_update_datetime <= '2020-12-18 14:00:18.080')
or (cth.record_update_datetime > '2020-12-17T09:13:06' and
cth.record_update_datetime <= '2020-12-18 14:00:18.080')
or (ph.record_update_datetime > '2020-12-18T09:34:27' and
ph.record_update_datetime <= '2020-12-18 14:00:18.080')
or (ctt.record_update_datetime > '2020-12-17T09:13:52' and
ctt.record_update_datetime <= '2020-12-18 14:00:18.080')
or (cts.record_update_datetime > '2020-12-17T09:12:20' and
cts.record_update_datetime <= '2020-12-18 14:00:18.080'))
and er.edition_code in
('EME21LEP','AET20GAT','AEL20SMA','BRA20FFS','BRA20FPT','BRA20FTP','AET20GEX','AET20GFX','AEL20FWA',
'AEL20OHM','GBR21IMA','MTM21TAS','AET20SAH','AET21DFC','AEC20ACS','BRA21IPR','HLN21CPM','AET21ATW','AEL21DML','AET21ABR')

order by ph.record_insert_datetime limit 1000 offset 0

#Explain plan output#

"Limit (cost=136450717513.61..136450717513.70 rows=1 width=449)"
" -> Unique (cost=136450717513.61..136450717513.70 rows=1 width=449)"
" -> Sort (cost=136450717513.61..136450717513.62 rows=1 width=449)"
" Sort Key: ph.record_insert_datetime, cth.contact_id,
cth.activity_datetime, cth.record_update_datetime,
cth.transaction_status_id, cts.session_id, cth.utm_content_text,
cth.utm_campaign_text, cth.utm_mdm_text, cth.utm_source_text,
cth.utm_trm_text, cth.email_address, ssr.source_system_name,
c.mdm_contact_id, ph.first_name, ph.last_name,
global_lov_reference.global_lov_code, (max((CASE WHEN
((global_lov_reference_1.global_lov_value)::text = 'Linkedin'::text) THEN
si.social_detail ELSE NULL::character varying END)::text)), (max((CASE WHEN
((global_lov_reference_1.global_lov_value)::text = 'Twitter'::text) THEN
si.social_detail ELSE NULL::character varying END)::text)), (max((CASE WHEN
((global_lov_reference_1.global_lov_value)::text = 'Skype'::text) THEN
si.social_detail ELSE NULL::character varying END)::text)), (max((CASE WHEN
((global_lov_reference_1.global_lov_value)::text = 'Facebook'::text) THEN
si.social_detail ELSE NULL::character varying END)::text)),
ph.organization_name, ph.organization_size, ph.job_title,
ph.organization_business_volume, ph.income_currency_id, ph.nationality_id,
sr.series_code, er.edition_code, br.brand_code, c.record_update_datetime,
ph.record_update_datetime, ctt.record_update_datetime,
cts.record_update_datetime"
" -> Nested Loop Left Join (cost=29835.02..136450717513.60
rows=1 width=449)"
" Join Filter: ((ph.mdm_person_id)::text =
(si.mdm_contact_id)::text)"
" -> Nested Loop Left Join (cost=2.59..136450687659.61
rows=1 width=313)"
" -> Nested Loop (cost=2.18..136450687658.10
rows=1 width=310)"
" Join Filter: (ctt.relationship_id =
rr.relationship_id)"
" -> Nested Loop
(cost=2.18..136450687648.74 rows=1 width=314)"
" Join Filter: (cth.source_system_id =
ssr.source_system_id)"
" -> Nested Loop
(cost=2.18..136450687639.48 rows=86 width=292)"
" -> Nested Loop
(cost=1.87..136450687525.94 rows=86 width=285)"
" -> Nested Loop
(cost=0.58..136450687328.34 rows=86 width=273)"
" Join Filter:
(((c.mdm_contact_id)::text = (ph.mdm_person_id)::text) AND
(((c.record_update_datetime > '2020-12-18 08:35:34'::timestamp without time
zone) AND (c.record_update_datetime <= '2020-12-18 14:00:18.08'::timestamp
without time zone)) OR ((cth.record_update_datetime > '2020-12-17
09:13:06'::timestamp without time zone) AND (cth.record_update_datetime <=
'2020-12-18 14:00:18.08'::timestamp without time zone)) OR
((ph.record_update_datetime > '2020-12-18 09:34:27'::timestamp without time
zone) AND (ph.record_update_datetime <= '2020-12-18 14:00:18.08'::timestamp
without time zone)) OR ((ctt.record_update_datetime > '2020-12-17
09:13:52'::timestamp without time zone) AND (ctt.record_update_datetime <=
'2020-12-18 14:00:18.08'::timestamp without time zone)) OR
((cts.record_update_datetime > '2020-12-17 09:12:20'::timestamp without
time zone) AND (cts.record_update_datetime <= '2020-12-18
14:00:18.08'::timestamp without time zone))))"
" -> Seq Scan on
person_history_1521_bkp_am ph (cost=0.00..652835.20 rows=18263320
width=125)"
" -> Materialize
(cost=0.58..92471229550.84 rows=60201 width=148)"
" -> Nested
Loop (cost=0.58..92471229249.83 rows=60201 width=148)"
" Join
Filter: (ctt.contact_transaction_track_id =
cts.contact_transaction_track_id)"
" ->
Seq Scan on contact_transaction_session_1521_bkp_am cts
(cost=0.00..1330903.16 rows=50761316 width=24)"
" ->
Materialize (cost=0.58..46058319667.10 rows=60954 width=140)"
"
-> Nested Loop (cost=0.58..46058319362.33 rows=60954 width=140)"
"
Join Filter: (cth.contact_transaction_id = ctt.contact_transaction_id)"
"
-> Seq Scan on contact_transaction_track_1521_bkp_am ctt
(cost=0.00..1237342.68 rows=51396468 width=28)"
"
-> Materialize (cost=0.58..96304624.37 rows=59616 width=128)"
"
-> Nested Loop (cost=0.58..96304326.29 rows=59616 width=128)"
"
Join Filter: (cth.edition_id = er.edition_id)"
"
-> Seq Scan on edition_reference er (cost=0.00..8117.85
rows=5 width=21)"
"
Filter: ((event_end_date >= '2020-12-18'::date) AND
((edition_code)::text = ANY
('{EME21LEP,AET20GAT,AEL20SMA,BRA20FFS,BRA20FPT,BRA20FTP,AET20GEX,AET20GFX,AEL20FWA,AEL20OHM,GBR21IMA,MTM21TAS,AET20SAH,AET21DFC,AEC20ACS,BRA21IPR,HLN21CPM,AET21ATW,AEL21DML,AET21ABR,AET21DBR,HAN20VFA,HAN20VFE,BRA20FRM,AET20GAP,GBR20TEU,AEL21DAH,AET21DF4,AET21DME,BRA20ABF,BRA20FUC,BRA21TEC,BRA20FSV,AEL20GPC,AET20FPN,AET20DNJ,AEL21UFM,GBR20SLM,GBR21IMX,BRZ21FAG,BRZ22FEI,BRA21EXM,AET21GAM,EME21HCK,HLN21VAD}'::text[])))"
"
-> Materialize (cost=0.58..89117306.15 rows=50268004
width=119)"
"
-> Nested Loop (cost=0.58..87982348.13
rows=50268004 width=119)"
"
-> Seq Scan on contact_1521_bkp_am c
(cost=0.00..1329661.36 rows=53223536 width=53)"
"
-> Bitmap Heap Scan on
contact_transaction_history_1521_bkp_am cth (cost=0.58..1.61 rows=2
width=74)"
"
Recheck Cond: (contact_id =
c.contact_id)"
"
-> Bitmap Index Scan on
contact_transaction_history_1521_bkp_am_contact_1521_bkp_am_id_
(cost=0.00..0.58 rows=2 width=0)"
"
Index Cond: (contact_id =
c.contact_id)"
" -> Bitmap Heap Scan on
series_reference sr (cost=1.29..2.30 rows=1 width=24)"
" Recheck Cond:
(series_id = er.series_id)"
" -> Bitmap Index
Scan on reference_series_reference_series_id_idx (cost=0.00..1.29 rows=1
width=0)"
" Index Cond:
(series_id = er.series_id)"
" -> Bitmap Heap Scan on
brand_reference br (cost=0.31..1.32 rows=1 width=19)"
" Recheck Cond: (brand_id
= sr.brand_id)"
" -> Bitmap Index Scan on
brand_reference_pkey (cost=0.00..0.31 rows=1 width=0)"
" Index Cond:
(brand_id = sr.brand_id)"
" -> Materialize (cost=0.00..7.97
rows=1 width=30)"
" -> Seq Scan on
source_system_reference ssr (cost=0.00..7.96 rows=1 width=30)"
" Filter:
((source_system_code)::text = 'SS_AEM'::text)"
" -> Seq Scan on relationship_reference rr
(cost=0.00..9.35 rows=1 width=8)"
" Filter: ((relationship_code)::text =
'ER_SP'::text)"
" -> Bitmap Heap Scan on global_lov_reference
(cost=0.41..1.43 rows=1 width=11)"
" Recheck Cond: (global_lov_id =
ph.salutation_id)"
" Filter: ((global_lov_name)::text =
'TITLE'::text)"
" -> Bitmap Index Scan on
reference_global_lov_global_lov_id_idx (cost=0.00..0.41 rows=1 width=0)"
" Index Cond: (global_lov_id =
ph.salutation_id)"
" -> GroupAggregate (cost=29832.43..29845.56 rows=375
width=165)"
" Group Key: si.mdm_contact_id"
" -> Sort (cost=29832.43..29833.37 rows=375
width=82)"
" Sort Key: si.mdm_contact_id"
" -> Nested Loop (cost=0.00..29816.40
rows=375 width=82)"
" Join Filter:
(si.social_information_type_id = global_lov_reference_1.global_lov_id)"
" -> Seq Scan on
contact_social_information_1521_bkp_am si (cost=0.00..15550.81 rows=141658
width=72)"
" Filter: ((status)::text =
'Active'::text)"
" -> Materialize (cost=0.00..1520.37
rows=6 width=18)"
" -> Seq Scan on
global_lov_reference global_lov_reference_1 (cost=0.00..1520.34 rows=6
width=18)"
" Filter:
((global_lov_name)::text = 'SOCIAL_MEDIA_INFORMATION'::text)"
"Note: An Approved plan was used instead of the minimum cost plan."
"SQL Hash: -545855157, Plan Hash: -1875523776, Minimum Cost Plan Hash:
-299897002"