What about hash partitioning on your primary key COL1?
On Sat, 29 Jan 2022, 12:52 am Pap, <oracle.developer35@xxxxxxxxx> wrote:
Hello Listers, It's a 11.2.0.4 oracle database. We have one table (say
REF_TAB) which has four columns, two of them(i.e. COL1, masked_COL1) are
actually holding business attributes and the other two are created_date and
created_by_user columns. The length of those two business columns are
varchar2(34 bytes) and varchar2(36 bytes) respectively. And both of these
columns hold all unique/distinct values. Col1 is the one on which the
primary key is defined. The table currently has ~1.5billion rows in it and
its size is ~160GB. It is estimated to grow to hold ~5-8billion rows.
The table is always being queried on a filter/join on COL1 and that too as
an outer join and will fetch the value of masked_col1. So in short the
requirement is to scan the full table data based on outer join on column
col1 like ( TRAN_TAB2.ANBR=REF_TAB.COL1 (+) ). And below is a sample
query sql monitor showing even that table is getting access using primary
key index but still is consuming all the time(sql_plan_line_id 13 and 14
below). As sql monitor shows , Is those 1hr+ DB time for the 14
million times index unique scan justified? And making it to go for full
using hints is chewing up ~100gb+ temp space too. I can't not think of any
partitioning strategy which can help us here to get the table access
faster, as we have to look up whole column data here for incoming value of
COL1.
So want to understand how the access path to this table can be made
faster? Will index organized tables be suggested in such a scenario and
will help us in this kind of requirement? Or any other design strategy
required here?
Global Information
------------------------------
Status : EXECUTING
Instance ID : 4
SQL Execution ID : 67108973
Execution Started : 01/27/2022 07:43:01
First Refresh Time : 01/27/2022 07:43:05
Last Refresh Time : 01/27/2022 09:04:19
Duration : 4879s
Fetch Calls : 2782
Global Stats
=================================================================================================================
| Elapsed | Cpu | IO | Application | Concurrency | Cluster |
Fetch | Buffer | Read | Read | Cell |
| Time(s) | Time(s) | Waits(s) | Waits(s) | Waits(s) | Waits(s) |
Calls | Gets | Reqs | Bytes | Offload |
=================================================================================================================
| 5469 | 2065 | 2464 | 0.01 | 0.00 | 940 |
2782 | 124M | 24M | 202GB | 9.09% |
=================================================================================================================
==============================================================================================================================================================================================================================
| Id | Operation | Name
| Rows | Cost | Time | Start | Execs | Rows | Read | Read
| Cell | Mem | Activity | Activity Detail |
| | |
| (Estim) | | Active(s) | Active | | (Actual) | Reqs |
Bytes | Offload | | (%) | (# samples)
|
==============================================================================================================================================================================================================================
| 0 | SELECT STATEMENT |
| | | 4875 | +4 | 1 | 14M | |
| | | 1.11 | Cpu (53) |
| 1 | NESTED LOOPS OUTER |
| 166K | 1M | 4875 | +4 | 1 | 14M | |
| | | 0.04 | Cpu (2) |
| 2 | VIEW |
| 166K | 901K | 4875 | +4 | 1 | 14M | |
| | | 0.40 | Cpu (19) |
| 3 | NESTED LOOPS OUTER |
| 166K | 901K | 4875 | +4 | 1 | 14M | |
| | | 0.04 | Cpu (2) |
| 4 | HASH JOIN |
| 166K | 402K | 4875 | +4 | 1 | 14M | |
| | 1M | 0.29 | Cpu (14) |
| 5 | JOIN FILTER CREATE | :BF0000
| 1836 | 66073 | 1 | +4 | 1 | 1890 | |
| | | | |
| 6 | TABLE ACCESS STORAGE FULL | STAGE_TAB
| 1836 | 66073 | 5 | +0 | 1 | 1890 | |
| | | 0.02 | gc cr multi block request (1) |
| 7 | JOIN FILTER USE | :BF0000
| 48M | 336K | 4875 | +4 | 1 | 15M | |
| | | 0.13 | Cpu (6) |
| 8 | PARTITION RANGE SINGLE |
| 48M | 336K | 4875 | +4 | 1 | 15M | |
| | | 0.04 | Cpu (2) |
| 9 | TABLE ACCESS STORAGE FULL | TRAN_TAB
| 48M | 336K | 4878 | +1 | 1 | 15M | 11748 | 11GB
| 92.40% | 7M | 0.25 | Cpu (11) |
| | |
| | | | | | | |
| | | | cell smart table scan (1) |
| 10 | PARTITION RANGE SINGLE |
| 1 | 4 | 4875 | +4 | 14M | 2M | |
| | | 0.53 | Cpu (25) |
| 11 | TABLE ACCESS BY LOCAL INDEX ROWID | TRAN_TAB2
| 1 | 4 | 4875 | +4 | 14M | 2M | 433K |
3GB | | | 2.52 | gc cr grant 2-way (26) |
| | |
| | | | | | | |
| | | | Cpu (57) |
| | |
| | | | | | | |
| | | | gcs drm freeze in enter server mode (2) |
| | |
| | | | | | | |
| | | | cell single block physical read (35) |
| 12 | INDEX RANGE SCAN | TRAN_TAB2_IX1
| 1 | 3 | 4875 | +4 | 14M | 2M | 271K |
2GB | | | 2.40 | gc cr grant 2-way (18) |
| | |
| | | | | | | |
| | | | Cpu (63) |
| | |
| | | | | | | |
| | | | cell single block physical read (33) |
| 13 | TABLE ACCESS BY INDEX ROWID | REF_TAB
| 1 | 3 | 4877 | +2 | 14M | 13M | 11M |
88GB | | | 34.01 | gc cr block 2-way (1)
|
| | |
| | | | | | | |
| | | | gc cr disk read (6) |
| | |
| | | | | | | |
| | | | Cpu (397) |
| | |
| | | | | | | |
| | | | cell single block physical read (1214) |
| -> 14 | INDEX UNIQUE SCAN | REF_TAB_PK
| 1 | 2 | 4876 | +4 | 14M | 13M | 12M | 89GB
| | | 57.09 | gc cr block 2-way (154) |
| | |
| | | | | | | |
| | | | gc cr block 3-way (14) |
| | |
| | | | | | | |
| | | | gc cr block busy (520) |
| | |
| | | | | | | |
| | | | gc cr disk read (30) |
| | |
| | | | | | | |
| | | | gc cr failure (1) |
| | |
| | | | | | | |
| | | | gc cr grant 2-way (106) |
| | |
| | | | | | | |
| | | | gc current block 2-way (4) |
| | |
| | | | | | | |
| | | | gc current grant 2-way (3) |
| | |
| | | | | | | |
| | | | gc remaster (2) |
| | |
| | | | | | | |
| | | | Cpu (754) |
| | |
| | | | | | | |
| | | | gcs drm freeze in enter server mode (6) |
| | |
| | | | | | | |
| | | | latch: object queue header operation (1) |
| | |
| | | | | | | |
| | | | cell single block physical read (1121) |
==============================================================================================================================================================================================================================
Predicate Information (identified by operation id):
---------------------------------------------------
4 - access("TRAN_TAB"."SBID"="SFID")
6 - storage(("PART_DATE"=:B1 AND "ASP_NM"=:B2))
filter(("PART_DATE"=:B1 AND "ASP_NM"=:B2))
9 - storage(("TRAN_TAB"."PART_DATE1"=:B1 AND
SYS_OP_BLOOM_FILTER(:BF0000,"TRAN_TAB"."SBID")))
filter(("TRAN_TAB"."PART_DATE1"=:B1 AND
SYS_OP_BLOOM_FILTER(:BF0000,"TRAN_TAB"."SBID")))
11 - filter("TRAN_TAB2"."PART_DATE1"=:B1)
12 - access("TRAN_TAB"."TX_ID"="TRAN_TAB2"."TX_ID" AND
"TRAN_TAB2"."P_CD"='XX')
14 - access("TRAN_TAB2"."ANBR"="REF_TAB"."COL1")
