FBI not used in xmlquery

G'day all,
Running the following set-up: Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - 64bit Production
Getting a full table scan on a table with an FBI.
Here is a sample set-up:
create table a (id number, filepath varchar2(256 char));
insert into a values(1,'/dir/subdir/file1.xml');
insert into a values(2,'/dir/subdir/file2.xml');
insert into a values(3,'/dir/subdir/file3.xml');
insert into a values(4,'/dir/subdir/file4.xml');
insert into a values(5,'/dir/subdir/file5.xml');
commit;
create index filepath_substr_fbi on a(substr(filepath,instr(filepath,'/',-1)+1));
create unique index filepath_uidx on a(filepath);So the requirement is to retrieve the ids from the table containing a particular filename. The filenames to retrieve are sourced from an xmltype. The approach I've taken is the following:
select * from a , (XMLTable('for $j in /task/related_files/ora:tokenize(text(),"\|")
where ora:matches($j,"\d+\.xml") return normalize-space($j)'
    PASSING xmltype(
'<task><related_files>File 1|file1.xml|file 2|file2.xml|file 3|file3.xml</related_files></task>'
))) x where substr(a.filepath,instr(a.filepath,'/',-1)+1) = x.column_value.getstringval();which returns the following results:
"ID"     "FILEPATH"     "COLUMN_VALUE"
1     "/dir/subdir/file1.xml"     file1.xml
2     "/dir/subdir/file2.xml"     file2.xml
3     "/dir/subdir/file3.xml"     file3.xmlNow, after running this sample, and doing an explain plan on it, I did notice it used the index!
Execution Plan
Plan hash value: 107833345
| Id | Operation                           | Name                  | Rows | Bytes | Cost (%CPU)| Time     |
|   0 | SELECT STATEMENT                    |                       |   408 |   109K|    32   (4)| 00:00:01 |
|   1 | MERGE JOIN                         |                       |   408 |   109K|    32   (4)| 00:00:01 |
|   2 |   TABLE ACCESS BY INDEX ROWID       | A                     |     5 | 1365 |     2   (0)| 00:00:01 |
|   3 |    INDEX FULL SCAN                  | FILEPATH_SUBSTR_FBI   |     5 |       |     1   (0)| 00:00:01 |
|* 4 |   SORT JOIN                         |                       |   408 |   816 |    30   (4)| 00:00:01 |
|* 5 |    COLLECTION ITERATOR PICKLER FETCH| XQSEQUENCEFROMXMLTYPE |   408 |   816 |    29   (0)| 00:00:0
Predicate Information (identified by operation id):
   4 - access(SUBSTR("FILEPATH",INSTR("FILEPATH",'/',(-1))+1)="XMLTYPE"."GETSTRINGVAL"(XMLCDATA(SYS_
              QNORMSPACE(SYS_XQ_UPKXML2SQL(VALUE(KOKBF$),2,1,0)),1)))
       filter(SUBSTR("FILEPATH",INSTR("FILEPATH",'/',(-1))+1)="XMLTYPE"."GETSTRINGVAL"(XMLCDATA(SYS_
              QNORMSPACE(SYS_XQ_UPKXML2SQL(VALUE(KOKBF$),2,1,0)),1)))
   5 - filter( REGEXP_LIKE (SYS_XQ_UPKXML2SQL(VALUE(KOKBF$),2,1,0),'\d+\.xml'))
Note
   - dynamic sampling used for this statement (level=2)Now for some reason, my actual code (which is not much different than sample above)..gets the following plan:
Execution Plan
Plan hash value: 1696443977
| Id | Operation                          | Name                  | Rows | Bytes | Cost (%CPU)| Time     |
|   0 | SELECT STATEMENT                   |                       |   449 | 53431 |    33   (4)| 00:00:01 |
|* 1 | HASH JOIN                         |                       |   449 | 53431 |    33   (4)| 00:00:01 |
|   2 |   TABLE ACCESS FULL                | DATA_CAPTURE_RECORD   |    11 | 1287 |     3   (0)| 00:00:01 |
|* 3 |   COLLECTION ITERATOR PICKLER FETCH| XQSEQUENCEFROMXMLTYPE |   408 |   816 |    29   (0)| 00:00
Predicate Information (identified by operation id):
   1 - access(SUBSTR("DRAFT_VPATH",INSTR("DRAFT_VPATH",'/',(-1))+1)="XMLTYPE"."GETSTRINGVAL"(XMLCDAT
              A(SYS_XQNORMSPACE(SYS_XQ_UPKXML2SQL(VALUE(KOKBF$),2,1,0)),1)))
   3 - filter( REGEXP_LIKE (SYS_XQ_UPKXML2SQL(VALUE(KOKBF$),2,1,0),'\d+\.xml'))Here is the sql query for the above plan:
select * from data_capture_record x, (XMLTable('for $j in /task/related_tasks/ora:tokenize(text(),"\|")
where ora:matches($j,"\d+\.xml") return normalize-space($j)'
    PASSING xmltype(
'<task><related_tasks>Actioning a Reminder Work Item or a BFd Action Item Work Item for Jury Service - clean up this Edit - another Edit | 17.xml| ROE Correct WI Received for a Regular ROE s | 24.xml| Sending benefit statement copies that are currently archived . | 10.xml| Test of TINY MCE Configurations - Test Edit. | 46.xml|</related_tasks> </task>'
))) a where substr(x.DRAFT_VPATH,instr(x.DRAFT_VPATH,'/',-1)+1) = a.column_value.getstringval();Any ideas? A quick note, i just started getting into xquery this week..so if you spot something, or see a better solution to my problem, please let me know...
Thanks for any help or advice.
Stephane

Indeed, cardinality and selectivity are essential in this case.
Consider the following test case with a 1,000,000-row table, the CBO picks up the index :
Connected to:
Oracle Database 11g Express Edition Release 11.2.0.2.0 - Production
SQL> create table test2 as
2 select level as path_id
3      , cast('/dir/subdir/file'||to_char(level,'fm0999999')||'.xml' as varchar2(256)) as filepath
4 from dual
5 connect by level <= 1000000 ;
Table created.
SQL> select count(*) from test2;
COUNT(*)
   1000000
SQL> create index test2_ix on test2 ( substr(filepath, instr(filepath, '/', -1) + 1) );
Index created.
SQL> exec dbms_stats.gather_table_stats(user, 'TEST2');
PL/SQL procedure successfully completed.
SQL> set lines 120
SQL> set autotrace on explain
SQL> select *
2 from test2 t
3 where substr(filepath, instr(filepath, '/', -1) + 1) in (
4    select filename
5    from xmltable(
6           'for $i in ora:tokenize(/task/related_files, "\|")
7            where ora:matches($i, "\d+\.xml")
8            return normalize-space($i)'
9           passing xmlparse(document '<task><related_files>File 1| file0000001.xml|file 2|file0999999.xml |file 3|file0007773.xml</related_files></
task>')
10           columns filename varchar2(30) path '.'
11         ) x
12 ) ;
   PATH_ID FILEPATH
         1 /dir/subdir/file0000001.xml
      7773 /dir/subdir/file0007773.xml
    999999 /dir/subdir/file0999999.xml
Execution Plan
Plan hash value: 420041503
| Id | Operation                           | Name                  | Rows | Bytes | Cost (%CPU)| Time     |
|   0 | SELECT STATEMENT                    |                       |   257 | 13107 |   643   (1)| 00:00:08 |
|   1 | NESTED LOOPS                       |                       |   257 | 13107 |   643   (1)| 00:00:08 |
|   2 |   SORT UNIQUE                       |                       |   408 |   816 |    29   (0)| 00:00:01 |
|* 3 |    COLLECTION ITERATOR PICKLER FETCH| XQSEQUENCEFROMXMLTYPE |   408 |   816 |    29   (0)| 00:00:01 |
|   4 |   TABLE ACCESS BY INDEX ROWID       | TEST2                 |     1 |    49 |     3   (0)| 00:00:01 |
|* 5 |    INDEX RANGE SCAN                 | TEST2_IX              |     1 |       |     2   (0)| 00:00:01 |
Predicate Information (identified by operation id):
   3 - filter( REGEXP_LIKE (SYS_XQ_UPKXML2SQL(VALUE(KOKBF$),2,1,0),'\d+\.xml'))
   5 - access(SUBSTR("FILEPATH",INSTR("FILEPATH",'/',-1)+1)=CAST(SYS_XQ_UPKXML2SQL(SYS_XQEXVAL(SYS_XQ
              _PKSQL2XML(SYS_XQNORMSPACE(SYS_XQ_UPKXML2SQL(VALUE(KOKBF$),2,1,0)),1,2,0),0,0,20971520,0),50,1,2) AS
              varchar2(30) ))
Note
   - Unoptimized XML construct detected (enable XMLOptimizationCheck for more information)
SQL> select t.*
2 from test2 t
3       join xmltable(
4         'for $i in ora:tokenize(/task/related_files, "\|")
5          where ora:matches($i, "\d+\.xml")
6          return normalize-space($i)'
7         passing xmlparse(document '<task><related_files>File 1| file0000001.xml|file 2|file0999999.xml |file 3|file0007773.xml</related_files></ta
sk>')
8         columns filename varchar2(30) path '.'
9       ) x
10       on substr(t.filepath, instr(t.filepath, '/', -1) + 1) = x.filename
11 ;
   PATH_ID FILEPATH
         1 /dir/subdir/file0000001.xml
    999999 /dir/subdir/file0999999.xml
      7773 /dir/subdir/file0007773.xml
Execution Plan
Plan hash value: 1810535419
| Id | Operation                          | Name                  | Rows | Bytes | Cost (%CPU)| Time     |
|   0 | SELECT STATEMENT                   |                       |   411 | 20961 | 1254   (1)| 00:00:16 |
|   1 | NESTED LOOPS                      |                       |   411 | 20961 | 1254   (1)| 00:00:16 |
|* 2 |   COLLECTION ITERATOR PICKLER FETCH| XQSEQUENCEFROMXMLTYPE |   408 |   816 |    29   (0)| 00:00:01 |
|   3 |   TABLE ACCESS BY INDEX ROWID      | TEST2                 |     1 |    49 |     3   (0)| 00:00:01 |
|* 4 |    INDEX RANGE SCAN                | TEST2_IX              |     1 |       |     2   (0)| 00:00:01 |
Predicate Information (identified by operation id):
   2 - filter( REGEXP_LIKE (SYS_XQ_UPKXML2SQL(VALUE(KOKBF$),2,1,0),'\d+\.xml'))
   4 - access(SUBSTR("FILEPATH",INSTR("FILEPATH",'/',-1)+1)=CAST(SYS_XQ_UPKXML2SQL(SYS_XQEXVAL(SYS_X
              Q_PKSQL2XML(SYS_XQNORMSPACE(SYS_XQ_UPKXML2SQL(VALUE(KOKBF$),2,1,0)),1,2,0),0,0,20971520,0),50,1,2)
              AS varchar2(30) ))
Note
   - Unoptimized XML construct detected (enable XMLOptimizationCheck for more information)From the plans above we see that the CBO estimates 408 rows from XMLTable.
This estimation could be refined by using hints : CARDINALITY (not documented), DYNAMIC_SAMPLING, or by using a wrapper function and the extensible optimizer feature.
For example, if you expect at most 10 rows every time :
SQL> select /*+ cardinality(x 10) */ t.*
2 from test2 t
3       join xmltable(
4         'for $i in ora:tokenize(/task/related_files, "\|")
5          where ora:matches($i, "\d+\.xml")
6          return normalize-space($i)'
7         passing xmlparse(document '<task><related_files>File 1| file0000001.xml|file 2|file0999999.xml |file 3|file0007773.xml</related_files></ta
sk>')
8         columns filename varchar2(30) path '.'
9       ) x
10       on substr(t.filepath, instr(t.filepath, '/', -1) + 1) = x.filename
11 ;
   PATH_ID FILEPATH
         1 /dir/subdir/file0000001.xml
    999999 /dir/subdir/file0999999.xml
      7773 /dir/subdir/file0007773.xml
Execution Plan
Plan hash value: 1810535419
| Id | Operation                          | Name                  | Rows | Bytes | Cost (%CPU)| Time     |
|   0 | SELECT STATEMENT                   |                       |    10 |   510 |    59   (0)| 00:00:01 |
|   1 | NESTED LOOPS                      |                       |    10 |   510 |    59   (0)| 00:00:01 |
|* 2 |   COLLECTION ITERATOR PICKLER FETCH| XQSEQUENCEFROMXMLTYPE |    10 |    20 |    29   (0)| 00:00:01 |
|   3 |   TABLE ACCESS BY INDEX ROWID      | TEST2                 |     1 |    49 |     3   (0)| 00:00:01 |
|* 4 |    INDEX RANGE SCAN                | TEST2_IX              |     1 |       |     2   (0)| 00:00:01 |
Predicate Information (identified by operation id):
   2 - filter( REGEXP_LIKE (SYS_XQ_UPKXML2SQL(VALUE(KOKBF$),2,1,0),'\d+\.xml'))
   4 - access(SUBSTR("FILEPATH",INSTR("FILEPATH",'/',-1)+1)=CAST(SYS_XQ_UPKXML2SQL(SYS_XQEXVAL(SYS_X
              Q_PKSQL2XML(SYS_XQNORMSPACE(SYS_XQ_UPKXML2SQL(VALUE(KOKBF$),2,1,0)),1,2,0),0,0,20971520,0),50,1,2)
              AS varchar2(30) ))
Note
   - Unoptimized XML construct detected (enable XMLOptimizationCheck for more information)

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Thanks Syed.
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Tony S. Garabedian

Index not used on view when table stats exist

Hello,
I would be grateful if someone comes with ideas on the following problem I'm currently facing.
I have a table with XMLTYPE data type column:
sql-->desc ACFBNK_STMT008
RECID NOT NULL VARCHAR2(200)
XMLRECORD XMLTYPE
I have a view V_ACFBNK_STMT008 on that table, in which the view columns are defined as extracted tags values from the XMLTYPE field, e.g. for the view field N_BOOKING_DATE:
numcast(extractValue(xmlrecord,'/row/c25')) "N_BOOKING_DATE"
(note: numcast is just a simple function that returns TO_NUMBER of its input argument)
I have also a function-based index on this field of the table:
CREATE INDEX train4.NIX_ACFBNK_STMT008_C25
ON train4.ACFBNK_STMT008("TRAIN4"."NUMCAST"(extractValue(xmlrecord,'/row/c25')))
And so, I'm executing on the view the following SQL statement:
SELECT RECID FROM V_ACFBNK_STMT008 WHERE (N_BOOKING_DATE > TO_NUMBER('20070725'));
Now, the problem comes: when statistics exist on the view base table (that is ACFBNK_STMT008) then the above statement is not using the index and is making a "table access full". When I delete the statistics for the table then the SQL runs fast with an "index range scan".
Which is further strange - when I change the ">" operand with a "=" the SQL statement correctly captures the index regardless of whether or not statistics exist.
I've tried to manually rewrite the SQL and include the "numcast" function in it:
SELECT RECID FROM TRAIN4.V_ACFBNK_STMT008 WHERE ( N_BOOKING_DATE>train4.numcast(TO_NUMBER( '20010725' ) ));
And in this way the index is used OK even with statistics existing!
But regretfully I don't have a way to change the application and the SQL, so the only things I can change is the view and/or the index.
Thank you in advance,
Evgeni
P.S.
I've tried gathering statistics in both the following ways but still the problem persists:
sql-->analyze table train4.ACFBNK_STMT008 compute statistics;
sql-->exec dbms_stats.gather_table_stats(ownname=>'TRAIN4', tabname=>'ACFBNK_STMT008', CASCADE=>TRUE, partname=>NULL);

Oh, and I forgot to mention: I cannot change the view definition as well (for example, to remove the "numcast"), since every now and then the application would recreate it automatically with the same code. :(

I have an old ipod that i have not used in a very long time, ive had it on a charger now for over an hour and i still cnnot get my ipod to turn on, how can i fix my problem, i just downloaded the new version of itunes aswell, so i know its not my itunes.

i have an old ipod touch that i have not used in a very long time, and im having trouble gettign it to turn on. ive had it on a charger for over an hour now and still nothing hs changed. i just updated my itunes to the current version they haev so i know its not an itunes problem its rather a problem with the old ipod touch itself. im leaving for deployment soon and im trying to get this fixed without having to send it in. If anyone has any ideas on how to get this thing turned on it would be greatly appreciated.

Well, two thoughts.
The battery has completely discharged and will take overnight to recharge, so don't expect much in an hour.
The battery has deep discharged and is now dead. It will never recharge and should be replaced.
If your iPod Touch, iPhone, or iPad is Broken
Apple does not fix iDevices. Instead they exchange yours for a refurbished or new replacement depending upon the age of your device and refurbished inventories. On rare occasions when there are no longer refurbished units for your older model, they may replace it with the next newer model.
You may take your device to an Apple retailer for help or you may call Customer Service and arrange to send your device to Apple:
Apple Store Customer Service at 1-800-676-2775 or visit online Help for more information.
To contact product and tech support: Contacting Apple for support and service - this includes international calling numbers.
iPod Service Support and Costs
iPhone Service Support and Costs
iPad Service Support and Costs
There are third-party firms that do repairs on iDevices, and there are places where you can order parts to DIY if you feel up to the task. Start with Google to search for these.
The flat fee for a battery exchange is, I believe, $99.00 USD.

Why am I being charged for data when connected to wifi AND not using my phone?!

WHY am I being charged for data that I'm not using? At times when I'm asleep AND my phone is connected to wifi?! This happens at really specific, alternating times like 9:54 pm every day, or 12:01 am, 6:01 am and then 12:01pm and 6:01pm. When I called I was told "maybe your wifi at home is disconnecting" or "maybe your phone is connecting to atnt or sprint". It's not possible that my phone is disconnecting from wifi every six hours on the dot and, at that exact time, I'm always using data. I find it hard to believe that I live in a HUGE city and my phone magically connects to other networks and I NEVER notice this. Verizon is full of LIARS (and maybe’s) and I'm not convinced that these data charges are a coincidence. I was told to turn off my cellular data to see if the problem resolves itself. Why should I alter my daily life when Verizon is clearly the one with the issue? I hope there's a class action lawsuit because Verizon is trying to get over on everyone! I need answers!

Hello NotHappy101,
I think it's quite odd that your data usage is at very specific times. We can certainly take a closer look. Please reply to my Direct Message, so we can get some additional details.
Thanks,
MichelleH_VZW
Follow us on Twitter @VZWSupport

FBI not used in xmlquery

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