Queries - full table scan
HelloIf I use the name like '% abc %' I still have full table scan. Is it possible to avoid it?
I read on the full-text index:
CTXCAT for the name fields
context of the clob fields
(1) is that correct or is at - it an easier option?
2) is this correct that these indices should be rebuild when the data changes?
Our database is 10.2.0.4, the above information is 11g docs
Kind regards
Nico
Published by: S11 on May 5, 2011 14:55
Histograms would be useless with a like '% something' value.
Function of material you can complete analysis that a Gigabyte table in 30 seconds then how a problem is a complete analysis for a partial value. How many times is this going to be done.
If the answer is high then you should probably use the Oracle text features.
HTH - Mark D Powell.
Tags: Database
Similar Questions
-
Hi all
I have a table which is accesed by application every 5 seconds. Now, this table has several delete insert updates current. The table size is aprox 200 MB (high tide) and there is say 5 ranks, which will be a sentence of 20 to 30 KB. My CMS is say 2 GB. So now the stats are not met and there is no index in this table. Now I see full table scan as his wait event. Now, I want to know.
How a scan full of tabel happens Oracle load the entire 200MB of data in the SGA and then do a table scan or should just the actual size used by the table IE 20 to 30 KB.
Thank you
A
Hello
high waters is precisely the limit up to which Oracle must read to be sure that all the data has been seen, so if you have only about 30 KB of data in the table, even if the data is in the first a few blocks from the table, a complete analysis must read the 200 MB (which is not so good but takes more time to read a few blocks). (the reason is that it was once the data written in this block and it triggered the HWM),
You can reorganize the table (alter table mytable move or use DBMS_REDEFINITION so that you can do this, the application uses the table) to reset the HWM. ("If the current small" size used"is transient and if you expect the table to increase again to use 200 MB or more, don't need to reorg; do it if you are confident that the table will remain very weak)
Best regards
Brno Vroman.
-
Path to XML index table is full table scan
Hi all
I have a version of oracle 11.2.0.4.6 database
Try to implement partitioning on XML indexes.
Creates a table and index partitioned by time stamp as below.
Whenever I'm trying to find the path table makes a full table scan.
I have applied the fix as indicated ( Doc ID 13522189.8 ).
So the recovery is quite slow and partition pruning does not not on XML indexes.
Wondering if anyone has experienced the same problem?
CREATE TABLE INCIDENT
(
INCIDENT_PK NUMBER (14.5).
INCIDENTGROUPING_PK NUMBER (14.5).
INCIDENTTYPE_PK NUMBER (14.5).
SECURITYCLASS_PK NUMBER (14.5).
STAMP OF INCIDENT_DATE,
SYS INCIDENT_DETAIL. XMLTYPE
)
TABLESPACE DATA_TBS_INCIDENT
PCTUSED 0
PCTFREE 10
INITRANS 1
MAXTRANS 255
STORAGE)
64K INITIALS
MINEXTENTS 1
MAXEXTENTS UNLIMITED
PCTINCREASE 0
DEFAULT USER_TABLES
)
LOGGING
NOCOMPRESS
PARTITION BY RANGE (INCIDENT_DATE)
(PARTITION SEP2013_WEEK1 VALUES LESS THAN (to_timestamp (' 00:00:00.00 2013-09-08 ',' YYYY-MM-DD HH24:MI:SS.))) FF2')),
PARTITION SEP2013_WEEK2 VALUES LESS THAN (to_timestamp ('2013-09-15 00:00:00.00 ',' YYYY-MM-DD HH24:MI:SS.)) FF2')),
PARTITION SEP2013_WEEK3 VALUES LESS THAN (to_timestamp ('2013-09-22 00:00:00.00 ',' YYYY-MM-DD HH24:MI:SS.)) FF2')),
..........);
CREATE the INDEX INCIDENTxdb_idx
ON corpaudlive. INCIDENT (INCIDENT_detail) INDEXTYPE IS XDB. LOCAL XMLINDEX 10 PARALLEL
PARAMETERS (' PATH TABLE INCIDENT_PATHTABLE (TABLESPACE DATA_TBS_INCIDENT))
PIKEY INDEX INCIDENT_PATHTABLE_PIKEY_IX (TABLESPACE IDX_TBS_INCIDENT)
PATH ID INDEX INCIDENT_PATHTABLE_ID_IX (TABLESPACE IDX_TBS_INCIDENT)
INCIDENT_PATHTABLE_VALUE_IX VALUE INDEX (TABLESPACE IDX_TBS_INCIDENT)
ORDER KEY INDEX INCIDENT_PATHTABLE_KEY_IX (TABLESPACE IDX_TBS_INCIDENT)
Paths (INCLUDE (//forename //surname //postcode //dateofbirth //street //town))');
SQL > explain the plan for
2 Select INCIDENT_pk in INCIDENT where XMLEXISTS ('/ / name [text () = 'john']' by the way of INCIDENT_detail)
3 and XMLEXISTS ("/ / name [text () 'clark' =]' by the way of INCIDENT_detail")
4 and a.INCIDENT_date between TO_TIMESTAMP (January 10, 2014 ',' DD/MM/YYYY "")
5 and TO_TIMESTAMP (September 10, 2014 ',' DD/MM/YYYY ');
He explained.
Elapsed time: 00:00:02.77
SQL > select * from table (dbms_xplan.display);
PLAN_TABLE_OUTPUT
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Hash value of plan: 123057549
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| ID | Operation | Name | Lines | Bytes | Cost (% CPU). Time | Pstart. Pstop | TQ | IN-OUT | PQ Distrib.
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 1. 70. 1803 (5) | 00:00:22 | | | | | |
| 1. COORDINATOR OF PX | | | | | | | | | | |
| 2. PX SEND QC (RANDOM). : TQ10003 | 1. 70. 1803 (5) | 00:00:22 | | | Q1, 03 | P > S | QC (RAND) |
| 3. SEMI NESTED LOOPS. | 1. 70. 1803 (5) | 00:00:22 | | | Q1, 03 | SVCP | |
| 4. NESTED LOOPS | | 1. 57. 1800 (5) | 00:00:22 | | | Q1, 03 | SVCP | |
| 5. VIEW | VW_SQ_1 | 239. 5975 | 1773 (5) | 00:00:22 | | | Q1, 03 | SVCP | |
PLAN_TABLE_OUTPUT
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| 6. UNIQUE HASH | | 239. 25334 | | | | | Q1, 03 | SVCP | |
| 7. RECEIVE PX | | 239. 25334 | | | | | Q1, 03 | SVCP | |
| 8. PX SEND HASH | : TQ10002 | 239. 25334 | | | | | Q1, 02 | P > P | HASH |
| 9. UNIQUE HASH | | 239. 25334 | | | | | Q1, 02 | SVCP | |
| * 10 | HASH JOIN | | 239. 25334 | 1773 (5) | 00:00:22 | | | Q1, 02 | SVCP | |
| 11. KIND OF BUFFER. | | | | | | | Q1, 02 | ISSUE | |
| 12. RECEIVE PX | | 1. 22. 3 (0) | 00:00:01 | | | Q1, 02 | SVCP | |
| 13. PX SEND BROADCAST | : TQ10000 | 1. 22. 3 (0) | 00:00:01 | | | | S > P | BROADCAST |
| 14. TABLE ACCESS BY INDEX ROWID | X$ PT74MSS0WBH028JE0GUCLBK0LHM4 | 1. 22. 3 (0) | 00:00:01 | | | | | |
| * 15 | INDEX RANGE SCAN | X$ PR74MSS0WBH028JE0GUCLBK0LHM4 | 1. | 2 (0) | 00:00:01 | | | | | |
| * 16. HASH JOIN | | 12077 | 990K | 1770 (5) | 00:00:22 | | | Q1, 02 | SVCP | |
PLAN_TABLE_OUTPUT
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| 17. RECEIVE PX | | 250K | 10 M | 39 (0) | 00:00:01 | | | Q1, 02 | SVCP | |
| 18. PX SEND BROADCAST | : TQ10001 | 250K | 10 M | 39 (0) | 00:00:01 | | | Q1, 01 | P > P | BROADCAST |
| 19. SYSTEM PARTITION ALL | | 250K | 10 M | 39 (0) | 00:00:01 | 1. 112. Q1, 01 | ISSUE | |
| * 20. TABLE ACCESS BY LOCAL INDEX ROWID | INCIDENT_PATHTABLE | 250K | 10 M | 39 (0) | 00:00:01 | 1. 112. Q1, 01 | SVCP | |
| * 21. INDEX RANGE SCAN | INCIDENT_PATHTABLE_VALUE_IX | 161. | 25 (0) | 00:00:01 | 1. 112. Q1, 01 | SVCP | |
| 22. ITERATOR BLOCK PX | | 221 M | 8865M | 1671 (1) | 00:00:21 | 53. 54. Q1, 02 | ISSUE | |
| * 23. TABLE ACCESS FULL | INCIDENT_PATHTABLE | 221 M | 8865M | 1671 (1) | 00:00:21 | 53. 54. Q1, 02 | SVCP | |
| * 24. TABLE ACCESS BY ROWID USER | INCIDENT | 1. 32. 1 (0) | 00:00:01 | ROWID | ROWID | Q1, 03 | SVCP | |
| * 25. SEE PUSHED PREDICATE. VW_SQ_2 | 1. 13. 20 (0) | 00:00:01 | | | Q1, 03 | SVCP | |
| 26. NESTED LOOPS | | 1. 106. 20 (0) | 00:00:01 | | | Q1, 03 | SVCP | |
| 27. NESTED LOOPS | | 4. 106. 20 (0) | 00:00:01 | | | Q1, 03 | SVCP | |
PLAN_TABLE_OUTPUT
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| 28. NESTED LOOPS | | 4. 256. 8 (0) | 00:00:01 | | | Q1, 03 | SVCP | |
| 29. TABLE ACCESS BY INDEX ROWID | X$ PT74MSS0WBH028JE0GUCLBK0LHM4 | 1. 22. 3 (0) | 00:00:01 | | | Q1, 03 | SVCP | |
| * 30 | INDEX RANGE SCAN | X$ PR74MSS0WBH028JE0GUCLBK0LHM4 | 1. | 2 (0) | 00:00:01 | | | Q1, 03 | SVCP | |
| 31. ITERATOR SYSTEM PARTITION. | 4. 168. 5 (0) | 00:00:01 | 53. 54. Q1, 03 | SVCP | |
| * 32 | TABLE ACCESS BY LOCAL INDEX ROWID | INCIDENT_PATHTABLE | 4. 168. 5 (0) | 00:00:01 | 53. 54. Q1, 03 | SVCP | |
| * 33 | INDEX RANGE SCAN | INCIDENT_PATHTABLE_PIKEY_IX | 4. | 4 (0) | 00:00:01 | 53. 54. Q1, 03 | SVCP | |
| 34. ITERATOR SYSTEM PARTITION. | 1. | 2 (0) | 00:00:01 | KEY | KEY | Q1, 03 | SVCP | |
| * 35 | INDEX RANGE SCAN | INCIDENT_PATHTABLE_KEY_IX | 1. | 2 (0) | 00:00:01 | KEY | KEY | Q1, 03 | SVCP | |
| * 36 | TABLE ACCESS BY LOCAL INDEX ROWID | INCIDENT_PATHTABLE | 1. 42. 3 (0) | 00:00:01 | 1. 1. Q1, 03 | SVCP | |
-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
PLAN_TABLE_OUTPUT
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Information of predicates (identified by the operation identity card):
---------------------------------------------------
10 - access("SYS_P9".") PATHID '=' ID')
Access (SYS_PATH_REVERSE ("PATH") 15 - > = HEXTORAW ('02582E') AND SYS_PATH_REVERSE ("PATH") < HEXTORAW ('02582EFF'))
16 - access("SYS_P11".") RID "IS 'SYS_P9'." GET RID OF"AND TBL$ OR$ IDX$ PART$ NUM ("CORPAUDLIVE". "THE INCIDENT", 0,7,65535, "SYS_P9" "." " "RID") = TBL$ OR$ IDX$ PART$ NUM ("CORPAUDLIVE". "INCIDENT_PATHTAB
THE', 0,7,65535, ROWID))
filter ("SYS_P9". "ORDER_KEY" < = 'SYS_P11' "." " ORDER_KEY' AND 'SYS_P11 '. "" ORDER_KEY "< SYS_ORDERKEY_MAXCHILD ("SYS_P9". "ORDER_KEY")) "
20 filter (SYS_XMLI_LOC_ISTEXT ("SYS_P11". "LOCATOR", "SYS_P11" "." " PATHID') = 1)
21 - access("SYS_P11".") The VALUE "= 'John')
23 filter (SYS_XMLI_LOC_ISNODE ("SYS_P9". "LOCATOR") = 1 AND SYS_OP_BLOOM_FILTER (: BF0000, "SYS_P9".) " PATHID'))
PLAN_TABLE_OUTPUT
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
24 - filter("A".") INCIDENT_DATE' > = TIMESTAMP' 2014 - 10 - 01 00:00:00.000000000 "AND"A"". "" INCIDENT_DATE"< = TIMESTAMP' 2014 - 10 - 09 00:00:00.000000000' AND
"ITEM_2" = TBL$ OR$ IDX$ PART$ NUM ("INCIDENT", 0,7,65535, "A". ROWID))
25 filter ("ITEM_4" = TBL$ OR$ IDX$ PART$ NUM ("INCIDENT", 0,7,65535, "A".) ROWID))
30 - access (SYS_PATH_REVERSE ("PATH") > = HEXTORAW('027FF9') AND SYS_PATH_REVERSE ("PATH") < HEXTORAW ('027FF9FF'))
32 filter (SYS_XMLI_LOC_ISNODE ("SYS_P2". "LOCATOR") = 1) "
33 - access("SYS_P2".") GET RID OF"="A ". ROWID AND 'SYS_P2 '. ("' PATHID '=' ID ')
35 - access("SYS_P4".") GET RID OF"="A ". ROWID AND 'SYS_P2 '. "" ORDER_KEY "< ="SYS_P4. " "" ORDER_KEY "AND"SYS_P4 ". "" ORDER_KEY "< SYS_ORDERKEY_MAXCHILD ("SYS_P2". "ORDER_KEY")) "
filter ("SYS_P4". "RID"IS "SYS_P2"." GET RID OF"AND TBL$ OR$ IDX$ PART$ NUM("INCIDENT",0,7,65535,"SYS_P2".") "RID") = TBL$ OR$ IDX$ PART$ NUM ("INCIDENT_PATHTABL
E «(, 0,7,65535, ROWID)).
36 - filter("SYS_P4".") The VALUE '= 'clark' AND SYS_XMLI_LOC_ISTEXT ("SYS_P4".' LOCATOR', 'SYS_P4 '. (("" PATHID ') = 1).
PLAN_TABLE_OUTPUT
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Note
-----
-dynamic sample used for this survey (level = 6)
69 selected lines.
Elapsed time: 00:00:00.47
SQL > spool off
Thank you
CenterB
You must create a XMLIndex with two groups:
create table actionnew)
number of action_pk
action_date timestamp
action_detail xmltype
)
partition by (range (action_date)
partition values before_2015 less (timestamp ' 2015-01-01 00:00:00 ')
, partition values jan_2015 less (timestamp ' 2015-02-01 00:00:00 ')
, partition values feb_2015 less (timestamp ' 2015-03-01 00:00:00 ')
);
create index actionnew_sxi on actionnew (action_detail)
indexType is xdb.xmlindex
local
parameters (q'~)
Group my_group_1
XMLTable actionnew_xt1
"/ audit/action_details/screen_data/tables/table/row.
path of varchar2 (100) the columns "name".
, path of surname varchar2 (100) "first name".
Group my_group_2
XMLTable actionnew_xt2
"/ audit/action_details/fields.
path of varchar2 (100) the columns "name".
, path of surname varchar2 (100) "first name".
~'
);
Select x.*
to actionnew t
xmltable)
"/ audit/action_details/screen_data/tables/table/row.
in passing t.action_detail
path of varchar2 (100) the columns "name".
, path of surname varchar2 (100) "first name".
) x
where t.action_date between timestamp ' 2015-02-01 00:00:00 '
and timestamp ' 2015-03-01 00:00:00 '
and x.forename = 'anwardo. '
and x.surname = 'gram '.
;
-
How to avoid the full table scan?
Hello
I'm new to sql tuning. When I run the following query. Full table scan that happens and it does not use the index.
SELECT / * + FIRST_ROWS (2) * / a0.t$ ttyp, a0.t$ amnt FROM forest112 WHERE a0.t$ amnt <>: 1 AND a0.t$ dapr =: 2 AND a0.t$ tapr =: 3;
When I searched on the net, I found by changing the operator '<>' with 'NOT IN' we can make the query to use the index, but that will change the result. Is this true? What are the other changes that can be made to this query?
I think that create under index may solve your problem, because in this case, it will not hit the table and get all desired data to index itself
create index ind_1 on forest112 (tapr$ t, t$ WTSA, dapr$ t, t$ ttyp) compute statistics;
Thank you
Harman
-
Tuning sql insert that inserts 1 million lines makes a full table scan
Hi Experts,
I'm on Oracle 11.2.0.3 on Linux. I have a sql that inserts data into a table of History/Archives of a table main application based on the date. The application table has 3 million lines. and all the lines that are more then 6 months old must go in a table of History/Archives. This was decided recently, and we have 1 million rows that meet this criterion. This insertion in table archive takes about 3 minutes. Plan of the explain command shows a full table scan on the main Board - which is the right thing, because we are pulling 1 million rows in the main table in the history table.
My question is that, is it possible that I can do this sql go faster?
Here's the query plan (I changed the names of table etc.)
INSERT INTO EMP_ARCH SELECT * FROM EMP M where HIRE_date < (sysdate - :v_num_days); call count cpu elapsed disk query current rows ------- ------ -------- ---------- ---------- ---------- ---------- ---------- Parse 2 0.00 0.00 0 0 0 0 Execute 2 96.22 165.59 92266 147180 8529323 1441230 Fetch 0 0.00 0.00 0 0 0 0 ------- ------ -------- ---------- ---------- ---------- ---------- ---------- total 4 96.22 165.59 92266 147180 8529323 1441230 Misses in library cache during parse: 1 Misses in library cache during execute: 1 Optimizer mode: FIRST_ROWS Parsing user id: 166 Rows Row Source Operation ------- --------------------------------------------------- 1441401 TABLE ACCESS FULL EMP (cr=52900 pr=52885 pw=0 time=21189581 us)
I heard that there is a way to use opt_param tip to increase the multiblock read County but did not work for me... I will be grateful for suggestions on this. can collections and this changing in pl/sql also make it faster?
Thank you
OrauserN
(1) create an index on hire_date
(2) tip 'additional' use in the 'select' query '
(3) run ' alter session parallel DML'; before you run the entire statement
-
Events in db of SIDS waiting for full table scan
Guys,
10.2.0.5 / node 2 RAC / RHEL-3
CanAnyone give me a sql to find all done SID full table scans in a database?
Thank you!
HariYou hear all the sessions a FTS right now, or all sessions that have never done a FTS? For the latter, you can run something like this,
select sid,name,value from v$statname natural join v$sesstat where name like 'table scans%tables%' order by sid; -
The query makes a full table scan?
I have a simple select query that filters on the last 10 or 11 days of data in a table. In the first case, it runs in 1 second. In the second case it takes 15 minutes and still not done.
I can say that the second query (11 days) makes a full table scan.
-Why is this happening? ... I guess some kind of threshold?
-Are there a way to avoid this? ... or encourage Oracle to play nice.
I find confusing from the point of view before end/query to get very different performances.
Jason
Oracle 10g
Toad quest 10.6
CREATE TABLE delme10 AS SELECT * FROM ed_visits WHERE first_contact_dt >= TRUNC(SYSDATE-10,'D'); Plan hash value: 915912709 -------------------------------------------------------------------------------------------------- | Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time | -------------------------------------------------------------------------------------------------- | 0 | CREATE TABLE STATEMENT | | 4799 | 5534K| 4951 (1)| 00:01:00 | | 1 | LOAD AS SELECT | DELME10 | | | | | | 2 | TABLE ACCESS BY INDEX ROWID| ED_VISITS | 4799 | 5534K| 4796 (1)| 00:00:58 | |* 3 | INDEX RANGE SCAN | NDX_ED_VISITS_020 | 4799 | | 15 (0)| 00:00:01 | -------------------------------------------------------------------------------------------------- Predicate Information (identified by operation id): --------------------------------------------------- 3 - access("FIRST_CONTACT_DT">=TRUNC(SYSDATE@!-10,'fmd')) CREATE TABLE delme11 AS SELECT * FROM ed_visits WHERE first_contact_dt >= TRUNC(SYSDATE-11,'D'); Plan hash value: 1113251513 ----------------------------------------------------------------------------------------------------------------- | Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time | TQ |IN-OUT| PQ Distrib | ----------------------------------------------------------------------------------------------------------------- | 0 | CREATE TABLE STATEMENT | | 25157 | 28M| 14580 (1)| 00:02:55 | | | | | 1 | LOAD AS SELECT | DELME11 | | | | | | | | | 2 | PX COORDINATOR | | | | | | | | | | 3 | PX SEND QC (RANDOM) | :TQ10000 | 25157 | 28M| 14530 (1)| 00:02:55 | Q1,00 | P->S | QC (RAND) | | 4 | PX BLOCK ITERATOR | | 25157 | 28M| 14530 (1)| 00:02:55 | Q1,00 | PCWC | | |* 5 | TABLE ACCESS FULL | ED_VISITS | 25157 | 28M| 14530 (1)| 00:02:55 | Q1,00 | PCWP | | ----------------------------------------------------------------------------------------------------------------- Predicate Information (identified by operation id): --------------------------------------------------- 5 - filter("FIRST_CONTACT_DT">=TRUNC(SYSDATE@!-11,'fmd'))This seems to change the plan to explain it...
alter session set optimizer_index_cost_adj=10; -
causing trunc of the full Table Scans
I have a situtaion here where my query is this.
SQL > select count (1) in the HBSM_SM_ACCOUNT_INFO where OPTIONAL_PARM5 = 'HD' and CUST_STATUS in ('UP', "UUP") and trunc (FIRST_ACTVN_DATE) = trunc (sysdate);
COUNT (1)
----------
6
PLAN_TABLE_OUTPUT
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Hash value of plan: 3951750498
---------------------------------------------------------------------------------------------------------------
| ID | Operation | Name | Lines | Bytes | Cost (% CPU). Time | Pstart. Pstop |
---------------------------------------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | 1. 10. 13904 (1) | 00:02:47 |
| 1. GLOBAL TRI | 1. 10 | | | | |
| 2. SIMPLE LIST OF PARTITION. 1. 10. 13904 (1) | 00:02:47 | 12. 12.
|* 3 | TABLE ACCESS FULL | HBSM_SM_ACCOUNT_INFO | 1. 10. 13904 (1) | 00:02:47 | 12. 12.
---------------------------------------------------------------------------------------------------------------
Information of predicates (identified by the operation identity card):
---------------------------------------------------
3 filter (("CUST_STATUS" = "UP" OU "CUST_STATUS" = 'UUP') AND)
TO_DATE (INTERNAL_FUNCTION ("FIRST_ACTVN_DATE")) = TO_DATE (TO_CHAR(SYSDATE@!)))
16 selected lines.
If I remove the trunc clause in the query performance improves significantly the results are false.
SQL > select count (1) in the HBSM_SM_ACCOUNT_INFO where OPTIONAL_PARM5 = 'HD' and CUST_STATUS in ('UP', "UUP") and FIRST_ACTVN_DATE = trunc (sysdate);
COUNT (1)
----------
0
PLAN_TABLE_OUTPUT
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Hash value of plan: 454529511
---------------------------------------------------------------------------------------------------------------------------
| ID | Operation | Name | Lines | Bytes | Cost (% CPU). Time | Pstart. Pstop |
---------------------------------------------------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | 1. 40. 47 (0) | 00:00:01 |
|* 1 | TABLE ACCESS BY INDEX ROWID | HBSM_SM_ACCOUNT_INFO | 1. 40. 47 (0) | 00:00:01 | 12. 12.
|* 2 | INDEX RANGE SCAN | IND_FIRST_ACTVN_DATE | 51. 4 (0) | 00:00:01 |
---------------------------------------------------------------------------------------------------------------------------
Can anyone please help me by which I can get the right data, and I can also prevent such full table scans.Unless you use a functional index, apply any function to an indexed column prevents the use of the index.
The way around it in your case is to realize that
select count(1) from HBSM_SM_ACCOUNT_INFO where OPTIONAL_PARM5='MH' and CUST_STATUS in ('UP','UUP') and trunc(FIRST_ACTVN_DATE) = trunc(sysdate)Really asking that the FIRST_ACTVN_DATE are sometimes today. You can rewrite so as
select count(1) from HBSM_SM_ACCOUNT_INFO where OPTIONAL_PARM5='MH' and CUST_STATUS in ('UP','UUP') and FIRST_ACTVN_DATE >= trunc(sysdate) and FIRST_ACTVN_DATE < trunc(sysdate) + 1Note that this may not always use the index according to the number of lines are the date of the day compared to how many are outside today's date.
Also, when you post, don't forget to put your code between
tags and to post create table scripts and sample data inserts. -
Hello experts,
I am on 11g R2 RHEL5, I have a general question here, oracle said complete random for table scan reads are slower sequential reading, as far as my knowledge a sequential read is a monobloc read into the buffer cache, and read a straggling is a multiblock read that can occur for a full restricted index scan or a full table scan. My question is what is a shuffle? and how it is different from the sequential reading? on the technical side... Please put some light on these technical terms, so that I can work on the setting. There is also a warrant RANDOM i/o.In a very brief way, the scan would be something like, you ask for the first time for employees starting with the name 'Aman' (wasn't there a lot with this name) to access using an index be a better choice (perhaps not a good example of a column containing names in real time. Example is just for the sake of discussion) then asking with the name of 'John '.
Aman...
-
Index on non unique values in order to avoid the full table scan
I have a table with > 100 k records. The table is updated only during the race every night. All columns except one have non - unique values and I am querying the table with this request.
COL3 - non - unique values - only 40 distinct values
unique values - no - COL4 - 1000 distinct values
last_column - 100 k unique values
Select last_column in the table_name where in (...) col3 or col4 (...)
I tried to create a Bitmap index individually on col3 and col4 and also combined. However, in both cases, it performs a full table scan.
Please, help me optimize this query as it is used in the term altogether the system and the cost of the query is very high around 650.
I don't have much experience with popular indexes then all tracks.
Thank you
Sensey
Published by: user13312817 on November 7, 2011 11:32An alternative might be to use a union instead and the 2 index:
create index my_index1 on my_table (col3, last_column) compress 1;
create index my_index2 on my_table (col4, last_column) compress 1;Select last_column from my_table
where col3 in (...)
Union
Select last_column from my_table
where col4 (...)In other words, if the UNION would apply here whereas in double values for last_column will be deleted.
-
Full table scan without sweeping particular column (CLOB data type column)
I want to select the online_bank table. This table with a column of type CLOB data. I want to select all the columns in the table, except the column type of clob data. but oracle full table, including the column analysis server type CLOB data when the query is run. It took a long time to complete the table. Please give me a solution of full table scan without analysis the CLOB data type column. How to avoid the time scanning CLOB data type column... ?878728 wrote:
I want to select the online_bank table. This table with a column of type CLOB data. I want to select all the columns in the table, except the column type of clob data. but oracle full table, including the column analysis server type CLOB data when the query is run. It took a long time to complete the table. Please give me a solution of full table scan without analysis the CLOB data type column. How to avoid the time scanning CLOB data type column... ?We do not have your table.
We do not have your data.
Therefore, we have no answer to your apparent mystery. -
Hai all,
10.2.0.4 on solaris 10
The shows to explain that it performs a table full scan on crm_t. I created indexes on the columnSELECT sum(RechargeForPrepaid/10000), to_date(substr (TIMESTAMP, 1,8),'YYYY/MM/DD') FROM medt.crm_t WHERE to_date(substr (TIMESTAMP, 1,8),'YYYY/MM/DD') >= trunc(sysdate)-1 and tradetype != '0' group by to_date(substr (TIMESTAMP, 1,8),'YYYY/MM/DD');
timestamp and tradetype too. collected stats too. but still, it makes a full table scan.
Please guide
Thank you
KaiObviously.
The column is named incorrectly--> timestamp is a reserved word.
It's also the wrong type--> dates should not be stored as varchar2.Also
( ) =
whereis indexed
always removes the index.The design of this table is a complete mess.
Drop and redesign.You can yourself to hack and put an index of feature based on the expression, but the table will still be a disaster.
I hope that this code does not belong to a commercial application.
Me cry and me to hire a lawyer to sue the seller.-----------
Sybrand Bakker
Senior Oracle DBA -
FULL TABLE SCAN even with the index, but why?
Could someone please explain why I'd get FULL TABLE SCAN explain plan results when joining 2 tables on columns that already have clues about them? For example,.
consider this fictional scenario:
employee table with columns:
employee # (primary key column)
name
address table with columns:
employee # (foreign key to employee.employee #)
subscription_type
address
Select Employee.Name since it is, address.address_type, address.address
where employee.employee # = address.employee #.
This query shows a full table scan in terms of the explain command.Full scan of the table is not necessarily slow and index access is not necessarily fast.
You will recover, no doubt, most if not all the ranks on both sides. The fastest way to retrieve each row in a table is to do a table scan. Using an index, and a single block of reading for each row in a table is much less effective than to do a table scan.
Justin
-
I have a table with 831 k lines and index:
When I run of EXPLAIN PLAN for the sql:CREATE TABLE "ROGADM"."ROG_LOG" ( "LOG_ID" NUMBER(10,0), "LOG_OBK_TYP" VARCHAR2(30 BYTE), "LOG_OBK_ID" VARCHAR2(200 BYTE), "LOG_TYP" VARCHAR2(30 BYTE), "LOG_RODZAJ" VARCHAR2(30 BYTE), "LOG_R_OBK_ID" VARCHAR2(200 BYTE), "LOG_DATA_ZDARZENIA" DATE, "LOG_OPIS_ZDARZENIA" VARCHAR2(4000 BYTE), "LOG_UTWORZYL" VARCHAR2(30 BYTE), "LOG_KIEDY_UTWORZYL" DATE, CONSTRAINT "LOG_PK" PRIMARY KEY ("LOG_ID") ); CREATE INDEX "ROGADM"."LOG_I" ON "ROGADM"."ROG_LOG" ( "LOG_OBK_ID", "LOG_OBK_TYP", "LOG_TYP", "LOG_RODZAJ" ); CREATE INDEX "ROGADM"."LOG_I2" ON "ROGADM"."ROG_LOG" ( "LOG_R_OBK_ID", "LOG_RODZAJ" ); CREATE UNIQUE INDEX "ROGADM"."LOG_PK" ON "ROGADM"."ROG_LOG" ( "LOG_ID" );
the output isSELECT log_obk_id FROM rog_log;
Why?PLAN_TABLE_OUTPUT Plan hash value: 3822058985 ----------------------------------------------------------------------------- | Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time | ----------------------------------------------------------------------------- | 0 | SELECT STATEMENT | | 831K| 8122K| 2240 (2)| 00:00:27 | | 1 | TABLE ACCESS FULL| ROG_LOG | 831K| 8122K| 2240 (2)| 00:00:27 | -----------------------------------------------------------------------------You have an index on the LOG_OBK_ID column. But when you select this column see you FULL TABLE SCAN and no index is used.
This is because you have not set your column as NOT NULL value column. Oracle stores a NULL value in the index. And that is why when you query the table for LOG_OBK_ID he goes to the table and does not use the index.
See the example below
SQL> create table my_test ( object_id number not null, object_type varchar2(100), object_name varchar2(100)); Table created. SQL> create index my_test_idx on my_test(object_id, object_type); Index created. SQL> insert into my_test 2 select object_id, object_type, object_name 3 from all_objects 4 where rownum <= 100000 5 / 50058 rows created. SQL> commit 2 / Commit complete. SQL> exec dbms_stats.gather_table_stats('KARTHICK_PATTABIRAMAN','MY_TEST',cascade=>true) PL/SQL procedure successfully completed. SQL> explain plan for select object_id from my_test 2 / Explained. SQL> select * from table(dbms_xplan.display) 2 / PLAN_TABLE_OUTPUT -------------------------------------------------------------------------------- Plan hash value: 720752151 ------------------------------------------------------------------------------------ | Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time | ------------------------------------------------------------------------------------ PLAN_TABLE_OUTPUT -------------------------------------------------------------------------------- | 0 | SELECT STATEMENT | | 50058 | 244K| 36 (0)| 00:00:01 | | 1 | INDEX FAST FULL SCAN| MY_TEST_IDX | 50058 | 244K| 36 (0)| 00:00:01 | ------------------------------------------------------------------------------------ 8 rows selected.See the index is used. Oracle considers the index as a Skinny table version and do a FULL scan on the INDEX and not on the TABLE.
Now, let us remove the NOT NULL constraint and see what happens.
SQL> alter table my_test modify object_id null 2 / Table altered. SQL> desc my_test Name Null? Type ----------------------------------------- -------- ---------------------------- OBJECT_ID NUMBER OBJECT_TYPE VARCHAR2(100) OBJECT_NAME VARCHAR2(100) SQL> exec dbms_stats.gather_table_stats('KARTHICK_PATTABIRAMAN','MY_TEST',cascade=>true) PL/SQL procedure successfully completed. SQL> explain plan for select object_id from my_test 2 / Explained. SQL> select * from table(dbms_xplan.display) 2 / PLAN_TABLE_OUTPUT -------------------------------------------------------------------------------- Plan hash value: 1615681525 ----------------------------------------------------------------------------- | Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time | ----------------------------------------------------------------------------- | 0 | SELECT STATEMENT | | 50058 | 244K| 67 (0)| 00:00:01 | | 1 | TABLE ACCESS FULL| MY_TEST | 50058 | 244K| 67 (0)| 00:00:01 | ----------------------------------------------------------------------------- 8 rows selected. SQL>See oracle now goes for FULL TABLE SCAN.
-
Hello
I chose all the table that are FULL TABLE SCAN and number of lines of my gaze of result as:
Usually mode_type 'line-sharing mode' (on large tables - 50 M).LOCK TABLE table_name mode_type;
Could someone explain to me why someone chooses the manual lock table?It is rare:
http://download.Oracle.com/docs/CD/B12037_01/AppDev.101/B10807/13_elems027.htm"Oracle has extensive automatic features that allow many programs read and write data at the same time, while each program sees a consistent view of data; You should rarely, if ever, need to lock tables yourself. »
There may be a valid reason for it - but since it's a such restrictive lock, I ask an explanation.
Maybe you are looking for
-
How can I reload my profile to make Firefox work
Firefox doesn't work, get the message that the profile is missing.
-
I can't use wifi on my note of K3 (K50a40 - India) after the 296 MB update. What should I do to solve the problem? Please help... _ / \.
-
GFWL "Cannot find C\Program Files (x86)...\GFWLive.exe '?
I am trying to reinstall GFWL on my computer after accidentally uninstalling it. However, when I run the Installer (which is 623ko according to Firefox), it says the above error when I try to run it, then it's not really do anything. Can someone tell
-
isn't 90% more questions from the actual training?
Several years ago I had an instructor (Chinese leader) who was in charge of the certification test,and she said that most of the test questions is from dishes of course.It allows to actually take the course.
-
How to add custom in CMIS query metadata attributes?
HelloI'm currently building a cmis query to search by FolderId and another custom meta data attribute (xPublished).I have two working individual applications for above, one with FolderId and other with xPublished.(1) SELECT * FROM cmis:document WHERE