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!
Hari
You 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;
Tags: Database
Similar Questions
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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.
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best way to avoid the full table scan for clause "column is zero.
I have a query with is control null, and because of that it performs a total scan of table (in millions of rows in the table)
SELECT id, x,
LAG (id) OVER (PARTITION BY userid ORDER BY has had place, id) as p_id,.
FROM MyTable
WHERE X is ZERO
What is the best way for me to avoid the full table scan. I have indexes for the X column and other columns.
Thank youHi Vasif
NULL values are indexed if the indexed entry also includes a value non-zero.
If you create an index such as:
CREATE INDEX mytable_x_idx ON mytable (x, ' ');
ensure all null values for the column X are indexed and will therefore potentially use the index to search for null values, assuming of course the result set is small enough to justify the use of the index in your query.
I have spoken previously on my blog:
http://richardfoote.WordPress.com/2008/01/23/indexing-nulls-empty-spaces/
See you soon
Richard Foote
http://richardfoote.WordPress.com/ -
How to improve the only table has full table scan with a lot of data and without PK
Hello world...
I have YOUR table...
CREATE YOUR TABLE
(
EMPLOYEE_NUMBER VARCHAR2 (30 BYTE) NOT NULL,
ATT_DATE DATE NOT NULL,
DATE OF DATE_TIME_IN,
DATE OF DATE_TIME_OUT,
NUMBER OF DELAY_MINUTES
NUMBER OF EARLY_EXIT_MINUTES
STATUS VARCHAR2 (20 BYTE)
)
This table contains a primary key and no clue on this subject. and coontain around 600 000 recoed.
query this table take about 5 mintes with full table scan
Select * from your.
I create indexes on Employee_No and atta_date, although there is a constarin for bith of them is not zero, but they have a duplciate value...
But even thogh the table always do full table scan...
BRThanks for the stats...
Well, your statistics on that table are updated.
The volume taken by the table is consistent with the number of lines you have and the average space taken by each activity.what I propose (this is not a 'query' problem since you decide to read the ENTIRE contents of the table and you are not satisfied with the performance):
-Try this query in parallel (maybe your server will not parallelize it):select /*+ PARALLEL(x) */ * from ta x- or check what are the events of theses/wait (probably the disk IO rate or the network)
REM: As SY compression could be an option to go in his direction, I repeat:
"change the type data number EMPLOYEE_NUMBER" instead of varchar2 (rebuild the table) in a way you will earn enough space (bytes/line) VS the actual duration of each lines.
Another way to reduce the space and If you insert / select in this table is finally reduce the PCTFREE, but beware the danger of this is that you will lose all the benefit if this table is updated or deleted. (it may not be the case today, but it could be in the future!)Published by: user11268895 on July 18, 2010 16:15
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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.
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Why is query on Table XMLTYPE ACME_CUST do a full Table Scan?
Our Oracle 11 g Enterprise Edition Release 11.2.0.1.0 database, there is a query against a record in 25 214 table XMLTYPE ACME_CUST.
Explain the plan indicates:SELECT rownum AS seq, EID AS eid, SUBSTR(CUST_ID, 1, INSTR(CUST_ID, '|')-1) AS tgt_acme_customer_id, SUBSTR(CUST_ID, INSTR(CUST_ID, '|') +1) AS src_acme_customer_id_list FROM (SELECT ac.eid EID, listagg(ac.acme_cust_id, '|') WITHIN GROUP ( ORDER BY ac.acme_cust_id, ac.acme_cust_id) CUST_ID FROM ACME_CUST ac GROUP BY ac.eid HAVING COUNT(ac.acme_cust_id)>1)
SELECT statement
County
VIEW
FILTER
Filter predicates
Count (*) > 1
GROUP SORT BY
ACME_CUST FOR FULL TABLE
The ACME_CUST Table has a virtual column defined on acme_cust_id as well as a corresponding index. He filed is also defined as the primary key.
Here is the table reflect and associated States:
Why is it not the ACME_CUST_ID_PK a unique index on the column virtual ACME_CUST_ID used in the plan to explain it?CREATE TABLE "N98991"."ACME_CUST" OF XMLTYPE ( CONSTRAINT "ACME_CUST_ID_PK" PRIMARY KEY ("ACME_CUST_ID") USING INDEX PCTFREE 10 INITRANS 2 MAXTRANS 255 COMPUTE STATISTICS STORAGE(INITIAL 65536 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645 PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT FLASH_CACHE DEFAULT CELL_FLASH_CACHE DEFAULT) TABLESPACE "ACME_DEV" ENABLE ) XMLTYPE STORE AS SECUREFILE BINARY XML ( TABLESPACE "ACME_DEV" ENABLE STORAGE IN ROW CHUNK 8192 CACHE READS LOGGING NOCOMPRESS KEEP_DUPLICATES STORAGE(INITIAL 106496 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645 PCTINCREASE 0 BUFFER_POOL DEFAULT FLASH_CACHE DEFAULT CELL_FLASH_CACHE DEFAULT) ) ALLOW NONSCHEMA ALLOW ANYSCHEMA VIRTUAL COLUMNS ( "EID" AS (CAST(SYS_XQ_UPKXML2SQL(SYS_XQEXVAL(XMLQUERY( 'declare default element namespace "http://www.cigna.com/acme/domains/customer/customerprofile/2011/11"; (::) /customerProfile/@eid' PASSING BY VALUE SYS_MAKEXML(128,"XMLDATA") RETURNING CONTENT ),0,0, 16777216,0),50,1,2) AS VARCHAR2(15))), *bold* "ACME_CUST_ID" AS (CAST(SYS_XQ_UPKXML2SQL(SYS_XQEXVAL(XMLQUERY( 'declare default element namespace "http://www.cigna.com/acme/domains/customer/customerprofile/2011/11"; (::) /customerProfile/@id' *bold* PASSING BY VALUE SYS_MAKEXML(128,"XMLDATA") RETURNING CONTENT ),0,0, 16777216,0),50,1,2) AS VARCHAR2(50))), "CRET_DT" AS (SYS_EXTRACT_UTC(CAST(TO_TIMESTAMP_TZ(SYS_XQ_UPKXML2SQL( SYS_XQEXVAL(XMLQUERY( 'declare default element namespace "http://www.cigna.com/acme/domains/customer/customerprofile/2011/11"; (::) /customerProfile/@create_dt' PASSING BY VALUE SYS_MAKEXML(128,"XMLDATA") RETURNING CONTENT ),0,0, 16777216,0),50,1,2),'SYYYY-MM-DD"T"HH24:MI:SS.FFTZH:TZM') AS TIMESTAMP WITH TIME ZONE))) ) PCTFREE 10 PCTUSED 40 INITRANS 1 MAXTRANS 255 NOCOMPRESS LOGGING STORAGE ( INITIAL 65536 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645 PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT FLASH_CACHE DEFAULT CELL_FLASH_CACHE DEFAULT ) TABLESPACE "ACME_DEV" ; CREATE INDEX "N98991"."ACME_CST_CRET_DT_IDX" ON "N98991"."ACME_CUST" ( "CRET_DT" ) PCTFREE 10 INITRANS 2 MAXTRANS 255 COMPUTE STATISTICS STORAGE ( INITIAL 65536 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645 PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT FLASH_CACHE DEFAULT CELL_FLASH_CACHE DEFAULT ) TABLESPACE "ACME_DEV" ; CREATE INDEX "N98991"."ACME_CST_EID_IDX" ON "N98991"."ACME_CUST" ( "EID" ) PCTFREE 10 INITRANS 2 MAXTRANS 255 COMPUTE STATISTICS STORAGE ( INITIAL 65536 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645 PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT FLASH_CACHE DEFAULT CELL_FLASH_CACHE DEFAULT ) TABLESPACE "ACME_DEV" ; *bold*CREATE UNIQUE INDEX "N98991"."ACME_CUST_ID_PK" ON "N98991"."ACME_CUST" ( "ACME_CUST_ID" ) PCTFREE 10 INITRANS 2 MAXTRANS 255 COMPUTE STATISTICS STORAGE *bold* ( INITIAL 65536 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645 PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT FLASH_CACHE DEFAULT CELL_FLASH_CACHE DEFAULT ) TABLESPACE "ACME_DEV" ; CREATE INDEX "N98991"."ACME_CUST_XMLINDEX_IX" ON "N98991"."ACME_CUST" ( OBJECT_VALUE ) INDEXTYPE IS "XDB"."XMLINDEX" PARAMETERS ( 'XMLTABLE ACME_CUST_IDX_TAB XMLNamespaces (''http://www.cigna.com/acme/domains/commoncontact/2011/11'' as "cm", default ''http://www.cigna.com/acme/domains/customer/customerprofile/2011/11''), ''/customerProfile'' columns DOB date PATH ''personInformation/cm:birthDate'', FIRSTNAME varchar2(40) PATH ''name/cm:givenName'', LASTNAME varchar2(40) PATH ''name/cm:surName'', SSN varchar2(30) PATH ''identifiers/ssn'', MEMBERINFOS XMLType path ''memberInfos/memberInfo'' VIRTUAL XMLTable acme_cust_lev2_idx_tab XMLNAMESPACES(default ''http://www.cigna.com/acme/domains/customer/customerprofile/2011/11''), ''/memberInfo'' passing MEMBERINFOS columns ami varchar2(40) PATH ''ami'', subscId varchar2(50) PATH ''clientRelationship/subscriberInformation/subscriberId'', employeeId varchar2(50) PATH ''systemKeys/employeeId'', clientId varchar2(50) PATH ''clientRelationship/clientId'' ' ); CREATE UNIQUE INDEX "N98991"."SYS_C00384339" ON "N98991"."ACME_CUST" ( "SYS_NC_OID$" ) PCTFREE 10 INITRANS 2 MAXTRANS 255 COMPUTE STATISTICS STORAGE ( INITIAL 65536 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645 PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT FLASH_CACHE DEFAULT CELL_FLASH_CACHE DEFAULT ) TABLESPACE "ACME_DEV" ; CREATE UNIQUE INDEX "N98991"."SYS_IL0000649948C00003$$" ON "N98991"."ACME_CUST" ( PCTFREE 10 INITRANS 2 MAXTRANS 255 STORAGE(INITIAL 65536 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645 PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT FLASH_CACHE DEFAULT CELL_FLASH_CACHE DEFAULT) TABLESPACE "ACME_DEV" PARALLEL (DEGREE 0 INSTANCES 0) ;
Any input would be much appreciated, like really puzzled here.
Kind regards
RickHi Richard,
Event 10053 appears excessive for this situation.
What is the problem?
Set the event, run the query, disconnected the event, check the trace file, that's all.It is not excessive if it helps you understand what is happening and why an index is of no use in this situation.
Tried the / * + INDEX_FFS (ACME_CUST_ID_PK) * / hint in the query "nested".
Don't know what nested query, you reference, so if I misunderstood what you mean, just ignore the comment.
What you posted earlier, it seems that you talk about this part:listagg(ac.acme_cust_id,'|') WITHIN GROUP ( ORDER BY ac.acme_cust_id,ac.acme_cust_id) CUST_IDThis isn't a nested query, it's a projection. All major works (recovery of lines) has already been done when it comes to this part.
Maybe just to accept the performance of the queries because it is...
Maybe you can try something else.
See the document: Oracle XML DB: best practices, page 15 exodus 8:
When there are multiple scalar values that must be consolidated or ordered, it is better to write
with XMLTable build projecting all the columns to be ordered or grouped as shown
below.Close example of your real need:
Connected to: Oracle Database 11g Express Edition Release 11.2.0.2.0 - Production SQL> create table xtab_cols of xmltype 2 xmltype store as securefile binary xml; Table created. SQL> insert /*+ append */ into xtab_cols 2 select xmlelement("ROW", 3 xmlforest( 4 TABLE_NAME, COLUMN_NAME, DATA_TYPE, DATA_TYPE_MOD, DATA_TYPE_OWNER, 5 DATA_LENGTH, DATA_PRECISION, DATA_SCALE, NULLABLE, COLUMN_ID, 6 DEFAULT_LENGTH, NUM_DISTINCT, LOW_VALUE, HIGH_VALUE, 7 DENSITY, NUM_NULLS, NUM_BUCKETS, LAST_ANALYZED, SAMPLE_SIZE, 8 CHARACTER_SET_NAME, CHAR_COL_DECL_LENGTH, 9 GLOBAL_STATS, USER_STATS, AVG_COL_LEN, CHAR_LENGTH, CHAR_USED, 10 V80_FMT_IMAGE, DATA_UPGRADED, HISTOGRAM 11 ) 12 ) 13 from dba_tab_cols 14 where owner = 'SYS' 15 ; 57079 rows created. SQL> commit; Commit complete. SQL> set long 1000 SQL> set pages 100 SQL> select xmlserialize(document object_value) from xtab_cols where rownum = 1; XMLSERIALIZE(DOCUMENTOBJECT_VALUE) --------------------------------------------------------------------------------|
SQL> exec dbms_stats.gather_table_stats(user, 'XTAB_COLS'); PL/SQL procedure successfully completed. SQL> set autotrace traceonly SQL> set timing on SQL> set lines 120 SQL> select x.table_name 2 , listagg(x.column_name, ',') within group (order by column_id) 3 from xtab_cols t 4 , xmltable('/ROW' passing t.object_value 5 columns table_name varchar2(30) path 'TABLE_NAME' 6 , column_name varchar2(30) path 'COLUMN_NAME' 7 , column_id number path 'COLUMN_ID' 8 ) x 9 group by x.table_name 10 ; 4714 rows selected. Elapsed: 00:00:08.25 Execution Plan ---------------------------------------------------------- Plan hash value: 602782846 --------------------------------------------------------------------------------- | Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time | --------------------------------------------------------------------------------- | 0 | SELECT STATEMENT | | 466M| 101G| 1580K (3)| 05:16:04 | | 1 | SORT GROUP BY | | 466M| 101G| 1580K (3)| 05:16:04 | | 2 | NESTED LOOPS | | 466M| 101G| 1552K (1)| 05:10:32 | | 3 | TABLE ACCESS FULL| XTAB_COLS | 57079 | 12M| 408 (1)| 00:00:05 | | 4 | XPATH EVALUATION | | | | | | --------------------------------------------------------------------------------- Statistics ---------------------------------------------------------- 9 recursive calls 1 db block gets 1713 consistent gets 0 physical reads 96 redo size 773516 bytes sent via SQL*Net to client 3873 bytes received via SQL*Net from client 316 SQL*Net roundtrips to/from client 1 sorts (memory) 0 sorts (disk) 4714 rows processedACCESS$ D_OBJ# NUMBER 22 N 1 7454 C2083A C3031D18 ,000134156157767642 0 1 2012-01-28 34794 YES NO 5 0 NO YES NONE And of course, even better after adding an XML index structured (4714 lines read in 1 s):
SQL> CREATE INDEX xtab_cols_sxi ON xtab_cols (OBJECT_VALUE) INDEXTYPE IS XDB.XMLIndex 2 PARAMETERS ( 3 q'#XMLTable my_xtab 4 '/ROW' 5 columns table_name varchar2(30) path 'TABLE_NAME' 6 , column_name varchar2(30) path 'COLUMN_NAME' 7 , column_id number path 'COLUMN_ID' #'); Index created. Elapsed: 00:00:13.42 SQL> select x.table_name 2 , listagg(x.column_name, ',') within group (order by column_id) 3 from xtab_cols t 4 , xmltable('/ROW' passing t.object_value 5 columns table_name varchar2(30) path 'TABLE_NAME' 6 , column_name varchar2(30) path 'COLUMN_NAME' 7 , column_id number path 'COLUMN_ID' 8 ) x 9 group by x.table_name 10 ; 4714 rows selected. Elapsed: 00:00:01.00 Execution Plan ---------------------------------------------------------- Plan hash value: 3303494605 ------------------------------------------------------------------------------ | Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time | ------------------------------------------------------------------------------ | 0 | SELECT STATEMENT | | 57520 | 3201K| 174 (3)| 00:00:03 | | 1 | SORT GROUP BY | | 57520 | 3201K| 174 (3)| 00:00:03 | | 2 | TABLE ACCESS FULL| MY_XTAB | 57520 | 3201K| 171 (1)| 00:00:03 | ------------------------------------------------------------------------------ Note ----- - dynamic sampling used for this statement (level=2) Statistics ---------------------------------------------------------- 297 recursive calls 1 db block gets 989 consistent gets 0 physical reads 176 redo size 773516 bytes sent via SQL*Net to client 3873 bytes received via SQL*Net from client 316 SQL*Net roundtrips to/from client 21 sorts (memory) 0 sorts (disk) 4714 rows processed -
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...
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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
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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 '.
;
-
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
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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.
-
Hello
If 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 14:55Histograms 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.
-
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.
-
Full table scan - condition of partition ignored
Hello world.
I ask a table partitioned, and when I hard code a condition of date on partitioned column, the query runs as expected - that is to say making reference to the partition in question.
I want to automate the application - and the date of the partition will vary each month (it is based on the last load of lots in our database from the previous month) - so I have a subquery that will get the date of the partition. The question I have is that when I run my query (including the subquery) - the explain command plan indicates that I now do a full table scan - I don't really want to. I read in some documents and came across this:
+ ' However, the optimizer do prune partitions if the SQL statement applies to a function to the partitioning (with the exception of the TO_DATE function) column ".". " +
My subquery contains several functions. Has anyone encountered this before and managed to work around? Ideally, I really need to try to find a solution that involves no PL/SQL, the query will be executed in Business Objects.
Any help or pointers greatly appreciated.
Void Query =
(SELECT TO_CHAR (TO_DATE (MAX (SUBSTR (A.PARTITION_NAME,-8)), 'YYYYMMDD'), 'YYYYMMDD') batch_date)
FROM DBA_TAB_PARTITIONS WHERE A.TABLE_OWNER = 'BUSINT_OWNER' AND A.TABLE_NAME = "TBL_FACT_DAILY_PLAN_BALANCE."
AND TO_CHAR (TO_DATE (SUBSTR(A.PARTITION_NAME,-8), 'YYYYMMDD'), 'MONTH') = TO_CHAR (ADD_MONTHS (TRUNC (SYSDATE),-1), 'MONTH'))Ouch!... Dates in the form VARCHAR2s! This will be just one of your many and varied ;-) problems
In any case, go you could achieve this through PL/SQL, where you limit the SELECT for a partition only, use dynamic SQL Native ("EXECUTE IMMEDIATE"):
... v_tab_part VARCHAR2(8); v_sql VARCHAR2(2048); ... BEGIN SELECT TO_CHAR(TO_DATE(MAX(SUBSTR(A.PARTITION_NAME,-8)),'YYYYMMDD'),'YYYYMMDD') INTO INTO v_tab_part FROM DBA_TAB_PARTITIONS A WHERE A.TABLE_OWNER = 'BUSINT_OWNER' AND A.TABLE_NAME = 'TBL_FACT_DAILY_PLAN_BALANCE' AND TO_CHAR(TO_DATE(SUBSTR(A.PARTITION_NAME,-8),'YYYYMMDD'),'MONTH') = TO_CHAR(ADD_MONTHS(TRUNC(SYSDATE),-1),'MONTH'); v_sql = 'SELECT' || ' /*+ USE_HASH (A B C D E F G) */ ' || ... 'FROM ' || 'TBL_FACT_DAILY_PLAN_BALANCE PARTITION (' || v_tab_part || ') C,' || 'BCP_STG D, ' || ... 'WHERE f.dac_end_date >= max_part.batch_date ' || 'and B.DAS_PK = F.DAC_ACC_STATUS_FK ' || ... 'GROUP BY ' || ... EXECUTE IMMEDIATE v_sql; END;However one thing, you could try prior to that would be to change the last attempt with the WITH CLAUSE of:
C.FDP_DATA_DATE = max_part.batch_dateVOY
C.FDP_DATA_DATE IN (max_part.batch_date)Unlikely to make a difference, perhaps, but worth a try
-
Full table scan when using Array and struct.
Guys,
Sometimes I use the table to another table in primary key. The problem is that I have to use force index to avoid the full table scan. I don't think it's a good idea. Could someone help me? Code example follows.
CREATE TYPE department_type () AS OBJECT
DNO NUMBER (10),
NAME VARCHAR2 (50).
LOCATION VARCHAR2 (50)
);
CREATE TYPE dept_array AS TABLE OF department_type;
Explain plan for
SELECT *.
OF ORD_HEADER H
where there are
(select 1 from table (dept_array (department_type (3535,-DNO))))
"NAME", NAME
'RENT', - LOCATION
t))) WHERE H.BUID = T.BUID
and H.ORDER_NUM = T.ORDER_NUM);
Select * from table (DBMS_XPLAN.display);And it's because the Oracle conjecture for the number of rows in the collection is probably out path. In my view, that the optimizer guess that there will be approximately 8000 items in the table. If it is 100 k rows in the table, she believes she's going to have to go back to 8% of the lines, if she opts for the full table scan. If there is 1 M rows in the table, she believes that she will have to return only 0.8% of the lines, so he chooses to use the index. If you provide a hint of CARDINALITY which gives Oracle a better estimate of the number of elements in the array, assuming you have the elements significantly less than 8000 on average, you are much more likely to have access to the index.
There is a wire askTom on [the cardinality hint when you use collections of PL/SQL in SQL | http://asktom.oracle.com/pls/asktom/f?p=100:11:0:P11_QUESTION_ID:3779680732446 #15740265481549] it is quite worth reading.
Justin
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