What is the meaning of the content under "information of Projection column (identified by the operation identity card)" in the output of dbms_xplan
Hi Experts,
I have a question to understand the output of the explain Plan. I'm on Oracle 11.2.0.2 on Linux. I use this command:
Select * from table (dbms_xplan.display_cursor (null, null, 'All allstats'));
In the output, there is a section like this:
Projection of the column information (identified by the operation identity card):
-----------------------------------------------------------
2 (#keys = 1; upd = 6, 7; cmp = 1, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16; cpy = 1, 5, 6, 8) 'A1 '. "CLNT_OID" [VARCHAR2, 16], 'G2' "." " CLNT_OID "[VARCHAR2, 16]..."
I'm not "what it means, and how this information will be used. I look at several presentations on the plan to explain it, but I don't have any explanation for this. Can someone explain what meanings, and how this information is useful?
Thank you!
OrauserN
Can someone explain what meanings, and how this information is useful?
Nothing more than general comments because does not have the validation of the application and the entire plan.
This article shows the projections of the column used for the specific steps of the execution plan. Each step is the operation identity card which has links with the plan which would be normally shown BEFORE the one-liner you posted.
A "projection" shows the actual columns for this stage located in the workplace. Occasionally, you will find that many more columns (and therefore data) are presented that are actually used.
Here is an article which presents and discusses, an extreme example.
http://alexanderanokhin.WordPress.com/2012/07/18/dont-forget-about-column-projection/
This example compares the projections for the two versions of an application from MERGER. It's version 1
Fusion in t1 with a t2 on (t1.id = t2.id)
when matched, then update set n = 1;
. . .
Be careful on the projection of the column of steps 3, 4, 5. It contains all THE columns in the tables T1 and T2, even though the query uses only some of them.
It is the second version of the application of the MERGER:
Fusion in (select id, n from t1) t1 2
using (select id, n of the t2) t2 on (t1.id = t2.id) 3
When 4 correspondent then update the value n = 1;
Now, projection of the column does not unnecessary, the amount of memory required and a result of temp space quantity columns contain (employee-Tmp ~ 16 MB) and i/o (2032 physical reads and 2032 physics written by direct path read temp and see direct writing temp) was significantly reduced, and the instruction was executed about 20 seconds, instead of 8 minutes.
What article and for example, try to show is that projection section can help show how much data a plan works for a particular stage of the plan.
This first version of MERGE seems very simple and easy to write, but as the author has pointed out, the projection indicates that all columns of the two tables were actually put in the workspace.
The almost as simple rewrite version 2 run time reduced to 20 seconds to 8 minutes, mainly because of significantly less data handled.
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Map 1:
PLAN_TABLE_OUTPUT
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Hash value of plan: 442504905
-----------------------------------------------------------------------------------------------------
| ID | Operation | Name | Lines | Bytes | Cost (% CPU). Time |
-----------------------------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | 1. 325. 13222 (1) | 00:02:39 |
| 1. SORT ORDER BY | 1. 325. 13222 (1) | 00:02:39 |
| 2. UNIQUE HASH | 1. 325. 13221 (1) | 00:02:39 |
| 3. NESTED LOOPS |
| 4. NESTED LOOPS | 1. 325. 13220 (1) | 00:02:39 |
| 5. NESTED LOOPS | 1. 224. 13217 (1) | 00:02:39 |
PLAN_TABLE_OUTPUT
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| 6. NESTED LOOPS | 1. 199. 13216 (1) | 00:02:39 |
| 7. NESTED LOOPS | 1. 144. 13215 (1) | 00:02:39 |
|* 8 | HASH JOIN | 1. 93. 13212 (1) | 00:02:39 |
|* 9 | TABLE ACCESS FULL | REC_EPS | 787. 25184 | 742 (2) | 00:00:09 |
| * 10 | TABLE ACCESS FULL | RECEIPTDETAIL | 1059K | 61 M | 12462 (1) | 00:02:30 |
| * 11 | TABLE ACCESS BY INDEX ROWID | LOTXLOCXID | 1. 51. 3 (0) | 00:00:01 |
| * 12 | INDEX RANGE SCAN | IDX_LLI_ISQ | 1 | | 2 (0) | 00:00:01 |
| 13. TABLE ACCESS BY INDEX ROWID | CODELKUP | 1. 55. 1 (0) | 00:00:01 |
| * 14 | INDEX UNIQUE SCAN | PK_SYS_C004623 | 1 | | 0 (0) | 00:00:01 |
| 15. TABLE ACCESS BY INDEX ROWID | RECEPTION | 1. 25. 1 (0) | 00:00:01 |
| * 16. INDEX UNIQUE SCAN | PK_SYS_C004755 | 1 | | 0 (0) | 00:00:01 |
PLAN_TABLE_OUTPUT
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| * 17. INDEX RANGE SCAN | PK_SYS_C004767 | 1 | | 2 (0) | 00:00:01 |
| 18. TABLE ACCESS BY INDEX ROWID | SKU | 1. 101 | 3 (0) | 00:00:01 |
-----------------------------------------------------------------------------------------------------
Information of predicates (identified by the operation identity card):
---------------------------------------------------
8 - access("RECEIPTDETAIL".") RECEIPTKEY «= SYS_OP_C2C ("REC_EPS".» ASNKEY') AND
'RECEIPTDETAIL '. "' SKU ' = SYS_OP_C2C ("REC_EPS". » « « « SKU »))
9 filter (SYS_OP_C2C ("REC_EPS". "ASNKEY") > = U '0' AND "
SYS_OP_C2C ("REC_EPS". ("ASNKEY") < = U'ZZZZZ ")
PLAN_TABLE_OUTPUT
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
10 - filter("RECEIPTDETAIL".") RECEIPTKEY' > = U "0" AND "RECEIPTDETAIL". "" RECEIPTKEY "< = U'ZZZZZ") "
11 - filter("LOTXLOCXID".") LOC "= U 'STAGE')
12 - access("RECEIPTDETAIL".") TOLD "=" LOTXLOCXID. " "" IDENTITY CARD "AND
'RECEIPTDETAIL '. ' ' SKU '=' LOTXLOCXID. ' "' SKU ' AND 'LOTXLOCXID '. ("' QTY ' > 0)
14 - access ("LISTNAME"= U 'RECSTATUS' AND "CODELKUP"." "RECEIPTDETAIL"="CODE". ("' STATUS ')
16 - access("RECEIPTDETAIL".") RECEIPTKEY "=" RECEPTION ". ("' RECEIPTKEY")
filter ("RECEPTION". "RECEIPTKEY" > = U '0' AND 'RÉCEPTION' "." " RECEIPTKEY"< = U'ZZZZZ") "
17 - access("RECEIPTDETAIL".") SKU "=" SKU ". ("' SKU ')
41 selected lines.
=================================================================
Plan No. 2:
PLAN_TABLE_OUTPUT
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Hash value of plan: 1174712643
----------------------------------------------------------------------------------------------------------
| ID | Operation | Name | Lines | Bytes | Cost (% CPU). Time |
----------------------------------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | 1. 325. 18382 (1) | 00:03:41 |
| 1. SORT ORDER BY | 1. 325. 18382 (1) | 00:03:41 |
| 2. UNIQUE HASH | 1. 325. 18381 (1) | 00:03:41 |
|* 3 | HASH JOIN | 1. 325. 18380 (1) | 00:03:41 |
| 4. NESTED LOOPS |
| 5. NESTED LOOPS | 1. 293. 17637 (1) | 00:03:32 |
PLAN_TABLE_OUTPUT
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| 6. NESTED LOOPS | 1. 192. 17634 (1) | 00:03:32 |
| 7. NESTED LOOPS | 1. 167. 17633 (1) | 00:03:32 |
| 8. NESTED LOOPS | 2. 224. 17631 (1) | 00:03:32 |
|* 9 | TABLE ACCESS BY INDEX ROWID | LOTXLOCXID | 2. 102. 3 (0) | 00:00:01 |
| * 10 | INDEX RANGE SCAN | IDX_LOTXLOCXID_LOC | 2 | | 1 (0) | 00:00:01 |
| * 11 | TABLE ACCESS BY INDEX ROWID | RECEIPTDETAIL | 1. 61. 8814 (1) | 00:01:46 |
| * 12 | INDEX SCAN FULL | IDX_RD_QCREQ | 1 | | 8813 (1) | 00:01:46 |
| 13. TABLE ACCESS BY INDEX ROWID | CODELKUP | 1. 55. 1 (0) | 00:00:01 |
| * 14 | INDEX UNIQUE SCAN | PK_SYS_C004623 | 1 | | 0 (0) | 00:00:01 |
| 15. TABLE ACCESS BY INDEX ROWID | RECEPTION | 1. 25. 1 (0) | 00:00:01 |
| * 16. INDEX UNIQUE SCAN | PK_SYS_C004755 | 1 | | 0 (0) | 00:00:01 |
PLAN_TABLE_OUTPUT
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| * 17. INDEX RANGE SCAN | PK_SYS_C004767 | 1 | | 2 (0) | 00:00:01 |
| 18. TABLE ACCESS BY INDEX ROWID | SKU | 1. 101 | 3 (0) | 00:00:01 |
| * 19. TABLE ACCESS FULL | REC_EPS | 787. 25184 | 742 (2) | 00:00:09 |
----------------------------------------------------------------------------------------------------------
Information of predicates (identified by the operation identity card):
---------------------------------------------------
3 - access("RECEIPTDETAIL".") RECEIPTKEY «= SYS_OP_C2C ("REC_EPS".» ASNKEY') AND
'RECEIPTDETAIL '. "' SKU ' = SYS_OP_C2C ("REC_EPS". » « « « SKU »))
9 - filter("LOTXLOCXID".") QTY' > 0)
PLAN_TABLE_OUTPUT
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
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19 - filter (SYS_OP_C2C ("REC_EPS". "ASNKEY") > = U '0' AND SYS_OP_C2C ("REC_EPS". " ASNKEY") < = U'ZZZZZ") "
44 selected lines.Did you test them? You do not have us given information on why you want to use one over the other... For example, do you need to recover as soon as possible all lines or do you want the first rows as quickly as possible? Given that you did not formatting on your plans and we do not request or background, we can say nothing. Even for an experienced DBA/developer - it is not always possible to read a plan and determine which is the 'best' - test and then you can tell us.
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