Structured storage XMLType but disappointing performance
Hi,
This relates to Oracle 11g, but maybe the same question can be asked for 10g.
I'm having a lot of big XML files which are structured following this xsd:
<?xml version="1.0" encoding="ISO-8859-1"?>
<xs:schema
xmlns="http://localhost/public/xsd/simple.xsd"
targetNamespace="http://localhost/public/xsd/simple.xsd"
xmlns:xs="http://www.w3.org/2001/XMLSchema"
xmlns:xdb="http://xmlns.oracle.com/xdb"
elementFormDefault="qualified"
attributeFormDefault="unqualified"
xdb:storeVarrayAsTable="true">
<xs:element name="root" xdb:defaultTable="simple_or" xdb:maintainDOM="false">
<xs:complexType>
<xs:sequence>
<xs:element name="ea">
<xs:complexType>
<xs:sequence>
<xs:element name="eb" minOccurs="1" maxOccurs="unbounded">
<xs:complexType>
<xs:sequence>
<xs:element name="c1" type="xs:double" />
<xs:element name="c2" type="xs:double" />
<xs:element name="c3" type="xs:double" />
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:schema>I create a VARRAY (the order is important) based structured storage table using the following commands:
declare
l_bfile bfile;
res boolean;
begin
l_bfile := bfilename('EXDIR', 'simple.xsd');
dbms_lob.open(l_bfile);
dbms_xdb.deleteResource('/public/simple.xsd',4);
res := dbms_xdb.createResource('/public/simple.xsd',l_bfile);
end;
BEGIN
DBMS_XMLSchema.deleteSchema(
schemaurl=>'http://localhost/public/xsd/simple.xsd',
delete_option=>DBMS_XMLSchema.Delete_Cascade_Force);
END;
begin
dbms_xmlschema.registerSchema(schemaurl => 'http://localhost/public/xsd/simple.xsd',
schemadoc => xdbUriType('/public/simple.xsd').getXML(),
local => true,
gentypes => true,
genbean => false,
gentables => true,
force => false,
owner => user);
end;
CREATE TABLE simple_or_1 OF XMLType
XMLSCHEMA "http://localhost/public/xsd/simple.xsd"
ELEMENT "root"
VARRAY "XMLDATA"."ea"."eb"
STORE AS TABLE simple_nested1
((PRIMARY KEY (NESTED_TABLE_ID, SYS_NC_ARRAY_INDEX$)))
/And I load some XML files of the following form:
<?xml version="1.0" encoding="UTF-8"?>
<root xmlns="http://localhost/public/xsd/simple.xsd">
<ea>
<eb>
<c1>4.0</c1>
<c2>5.0</c2>
<c3>6.0</c3>
</eb>
<eb>
<c1>7.0</c1>
<c2>8.0</c2>
<c3>9.0</c3>
</eb>
<eb>
<c1>7.0</c1>
... etc ...
</ea>
</root>
Every document has about 50.000 <eb> elements and I loaded 6 sample documents.
A simple query like the following takes about 5 minutes:
SELECT XMLQuery('
declare default element namespace "http://localhost/public/xsd/simple.xsd"; (: :)
for $i in /root
return max($i/a/b/c2)
' PASSING OBJECT_VALUE RETURNING CONTENT)
FROM simple_or_1;The explain plan shows the following:
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
| 0 | SELECT STATEMENT | | 6 | 60 | 3 (0)| 00:00:01 |
| 1 | SORT AGGREGATE | | 1 | 1901 | | |
|* 2 | TABLE ACCESS BY INDEX ROWID| SIMPLE_NESTED1 | 1969 | 3655K| 6 (0)| 00:00:01 |
|* 3 | INDEX RANGE SCAN | SYS_C009750 | 787 | | 2 (0)| 00:00:01 |
| 4 | SORT AGGREGATE | | 1 | | | |
| 5 | FAST DUAL | | 1 | | 2 (0)| 00:00:01 |
| 6 | TABLE ACCESS FULL | SIMPLE_OR_1 | 6 | 60 | 3 (0)| 00:00:01 |
Predicate Information (identified by operation id):
2 - filter(SYS_XMLCONV("SYS_ALIAS_2"."SYS_XDBPD$",0,32,'3952ABE048DCF8D6E040007F0101
7EA4',1,5561,1) IS NOT NULL)
3 - access("NESTED_TABLE_ID"=:B1)I'm not understanding the low performance of 5 minutes... is there anyone who can explain and help out?
Note with DOM Fidelity disabled on all types the SYS_XMLCONV is replaced with the more efficeint SYS_XMLGEN. However this is still not as efficient as the XMLTable approach..
C:\Documents and Settings\Mark D Drake>sqlplus sys/oracle as sysdba
SQL*Plus: Release 11.1.0.6.0 - Production on Fri Sep 7 06:03:39 2007
Copyright (c) 1982, 2007, Oracle. All rights reserved.
Connected to:
Oracle Database 11g Enterprise Edition Release 11.1.0.6.0 - Beta
With the Partitioning, OLAP, Data Mining and Real Application Testing options
SQL> connect / as sysdba
Connected.
SQL> --
SQL> drop user Tijink cascade
2 /
drop user Tijink cascade
ERROR at line 1:
ORA-01918: user 'TIJINK' does not exist
SQL> grant connect, resource, alter session, create view to Tijink identified by Tijink
2 /
Grant succeeded.
SQL> conn Tijink/Tijink
Connected.
SQL> --
SQL> set long 10000000
SQL> set pages 5000
SQL> var schemaPath varchar2(256)
SQL> var schemaURL varchar2(256)
SQL> var xmlSchema clob;
SQL> --
SQL> begin
2 :schemaURL := 'http://localhost/public/xsd/simple.xsd';
3 :schemaPath := '/public/simple.xsd';
4 :xmlSchema :=
5 '<?xml version="1.0" encoding="ISO-8859-1"?>
6 <xs:schema
7 xmlns="http://localhost/public/xsd/simple.xsd"
8 targetNamespace="http://localhost/public/xsd/simple.xsd"
9 xmlns:xs="http://www.w3.org/2001/XMLSchema"
10 xmlns:xdb="http://xmlns.oracle.com/xdb"
11 elementFormDefault="qualified"
12 attributeFormDefault="unqualified"
13 xdb:storeVarrayAsTable="true">
14 <xs:element name="root" xdb:defaultTable="simple_or">
15 <xs:complexType xdb:maintainDOM="false">
16 <xs:sequence>
17 <xs:element name="ea">
18 <xs:complexType xdb:maintainDOM="false">
19 <xs:sequence>
20 <xs:element name="eb" minOccurs="1" maxOccurs="unbounded">
21 <xs:complexType xdb:maintainDOM="false">
22 <xs:sequence>
23 <xs:element name="c1" type="xs:double" />
24 <xs:element name="c2" type="xs:double" />
25 <xs:element name="c3" type="xs:double" />
26 </xs:sequence>
27 </xs:complexType>
28 </xs:element>
29 </xs:sequence>
30 </xs:complexType>
31 </xs:element>
32 </xs:sequence>
33 </xs:complexType>
34 </xs:element>
35 </xs:schema>';
36 end;
37 /
PL/SQL procedure successfully completed.
SQL> alter session set events='31098 trace name context forever'
2 /
Session altered.
SQL> DECLARE
2 BINARY_XML boolean:=FALSE;
3 BEGIN
4 IF (BINARY_XML)
5 THEN
6 dbms_xmlschema.registerSchema(SCHEMAURL => :schemaURL,
7 SCHEMADOC => :xmlschema,
8 LOCAL => TRUE,
9 GENTYPES => FALSE,
10 GENBEAN => FALSE,
11 GENTABLES => FALSE,
12 ENABLEHIERARCHY => DBMS_XMLSCHEMA.ENABLE_HIERARCHY_NONE,
13 FORCE => FALSE,
14 OPTIONS => DBMS_XMLSCHEMA.REGISTER_BINARYXML,
15 OWNER => USER);
16 ELSE
17 dbms_xmlschema.registerSchema(SCHEMAURL => :schemaURL,
18 SCHEMADOC => :xmlSchema,
19 LOCAL => TRUE,
20 GENTYPES => TRUE,
21 GENBEAN => FALSE,
22 GENTABLES => TRUE,
23 ENABLEHIERARCHY => DBMS_XMLSCHEMA.ENABLE_HIERARCHY_NONE,
24 FORCE => FALSE,
25 OWNER => USER);
26 END IF;
27 END;
28 /
PL/SQL procedure successfully completed.
SQL> --
SQL> set timing on
SQL> set long 1000000
SQL> set pages 50000
SQL> set lines 200
SQL> --
SQL> call dbms_stats.GATHER_SCHEMA_STATS('TIJINK')
2 /
Call completed.
Elapsed: 00:00:01.67
SQL> set autotrace on explain
SQL> --
SQL> SELECT XMLQuery
2 ('
3 declare default element namespace "http://localhost/public/xsd/simple.xsd"; (: :)
4 for $i in /root
5 return max($i/ea/eb/c2)
6 ' PASSING OBJECT_VALUE RETURNING CONTENT)
7 FROM "simple_or"
8 /
no rows selected
Elapsed: 00:00:00.28
Execution Plan
Plan hash value: 3716725992
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
| 0 | SELECT STATEMENT | | 1 | 10 | 2 (0)| 00:00:01 |
| 1 | SORT AGGREGATE | | 1 | 23 | | |
|* 2 | TABLE ACCESS BY INDEX ROWID| SYS_NTobq/uFrTQGaOrq3BeDy9Eg== | 1 | 23 | 0 (0)| 00:00:01 |
|* 3 | INDEX RANGE SCAN | SYS_C009648 | 1 | | 0 (0)| 00:00:01 |
| 4 | SORT AGGREGATE | | 1 | | | |
| 5 | FAST DUAL | | 1 | | 2 (0)| 00:00:01 |
| 6 | TABLE ACCESS FULL | simple_or | 1 | 10 | 2 (0)| 00:00:01 |
Predicate Information (identified by operation id):
2 - filter(SYS_XMLGEN(TO_CHAR("SYS_ALIAS_1"."c2")) IS NOT NULL)
3 - access("NESTED_TABLE_ID"=:B1)
SQL> select max(c2)
2 from "simple_or",
3 xmltable
4 (
5 xmlnamespaces
6 (
7 default 'http://localhost/public/xsd/simple.xsd'
8 ),
9 '/root/ea/eb'
10 passing OBJECT_VALUE
11 columns
12 C2 PATH 'c2'
13 )
14 /
MAX(C2)
Elapsed: 00:00:00.15
Execution Plan
Plan hash value: 1041340395
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
| 0 | SELECT STATEMENT | | 1 | 33 | 0 (0)| 00:00:01 |
| 1 | SORT AGGREGATE | | 1 | 33 | | |
| 2 | NESTED LOOPS | | | | | |
| 3 | NESTED LOOPS | | 1 | 33 | 0 (0)| 00:00:01 |
| 4 | INDEX FULL SCAN | SYS_C009649 | 1 | 10 | 0 (0)| 00:00:01 |
|* 5 | INDEX RANGE SCAN | SYS_C009648 | 1 | | 0 (0)| 00:00:01 |
| 6 | TABLE ACCESS BY INDEX ROWID| SYS_NTobq/uFrTQGaOrq3BeDy9Eg== | 1 | 23 | 0 (0)| 00:00:01 |
Predicate Information (identified by operation id):
5 - access("NESTED_TABLE_ID"="simple_or"."SYS_NC0000700008$")
SQL> desc "simple_or"
Name Null? Type
TABLE of SYS.XMLTYPE(XMLSchema "http://localhost/public/xsd/simple.xsd" Element "root") STORAGE Object-relational TYPE "root648_T"
SQL> desc "root648_T"
Name Null? Type
ea ea649_T
SQL> desc "ea649_T"
Name Null? Type
eb eb651_COLL
SQL> desc "eb651_COLL"
"eb651_COLL" VARRAY(2147483647) OF eb650_T
Name Null? Type
c1 NUMBER
c2 NUMBER
c3 NUMBER
SQL>
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hi please I need help , I paid with my wifes credit card the upgrade in my icloud storage today but now any time I send an email appears ....from: my wifes name instead of my name ....how can I change this ,thank you
You might want to make sure your credit card is listed in the billing information associated with your Apple ID (see http://support.apple.com/kb/ht1918).
Also, to change the From name that appears when you address emails on and iOS device, go to Settings>Mail,Contacts,Calendars...tap your iCloud email account, tap you iCloud account at the top, tap Mail at the bottom, then enter the name you want to use in the Name field at the top.
To change the From name on your Mac Mail, go to icloud.com, sign into your account, open Mail, click the gear shaped icon on the bottom left and choose Preferences, go to the Accounts tab and enter the name you want to use in the Full Name field and click Done. Then quit Mail on your Mac and re-open it. Your new From name should now appear in the drop-down list when you compose a new email. -
how do I disable time machine? I want to use my external drive as additional storage. But it mirrors everything I edit. If I remove a document, it removes it from the external drive as well.
I purchased a 1 TB WD passport drive, formatted for Mac. I set it up originally (mistakenly) to backup time machine. I went back and set it to "do not backup" It still backs up evey document I edit. If I add a document when the drive is disconnected, it automatically adds it to the external drive the next time connect to the passport drive. If I remove a document the same thing happens.
I need additional storage to free up space on my laptop hard drive. This is not working the way I want it to. Help!Do not backup your startup volume to another partition on the same drive. If the drive fails you have nothing. Always backup to another drive or volume on another drive.
The I/O error usually means there's a problem with the drive. Clone ASAP, then repartition and reformat the main drive. Then restore the clone. Here's the basic process:
You will have to backup your OS X partition to an external drive, boot from the external drive, use Disk Utility to repartition and reformat your hard drive back to a single volume, then restore your backup to the internal hard drive.
Get an empty external hard drive and clone your internal drive to the external one.
Boot from the external hard drive.
Erase the internal hard drive.
Restore the external clone to the internal hard drive.
Clone the internal drive to the external drive
Open Disk Utility from the Utilities folder.
Select the destination volume from the left side list.
Click on the Restore tab in the DU main window.
Check the box labeled Erase destination.
Select the destination volume from the left side list and drag it to the Destination entry field.
Select the source volume from the left side list and drag it to the Source entry field.
Double-check you got it right, then click on the Restore button.
Destination means the external backup drive. Source means the internal startup drive.
Restart the computer and after the chime press and hold down the OPTION key until the boot manager appears. Select the icon for the external drive and click on the downward pointing arrow button.
After startup do the following:
Erase internal hard drive
Open Disk Utility in your Utilities folder.
After DU loads select your internal hard drive (this is the entry with the mfgr.'s ID and size) from the left side list. Note the SMART status of the drive in DU's status area. If it does not say "Verified" then the drive is failing or has failed and will need replacing. SMART info will not be reported on external drives. Otherwise, click on the Partition tab in the DU main window.
Under the Volume Scheme heading set the number of partitions from the drop down menu to one. Set the format type to Mac OS Extended (Journaled.) Click on the Options button, set the partition scheme to GUID then click on the OK button. Click on the Partition button and wait until the process has completed. Do not quit Disk Utility.
Restore the clone to the internal hard drive
Select the destination volume from the left side list.
Click on the Restore tab in the DU main window.
Check the box labeled Erase destination.
Select the destination volume from the left side list and drag it to the Destination entry field.
Select the source volume from the left side list and drag it to the Source entry field.
Double-check you got it right, then click on the Restore button.
Destination means the internal hard drive. Source means the external startup drive.
Note that the Source and Destination drives are swapped for this last procedure. -
Photoshop CS2 opens but wont perform any task (open jpgs, create new jpgs etc). Other CS2 progs such as indesign are fine. MAC shop, couldn't fix, said I should try install op system 4 Powerbook G4-dont have discs- can I get them? or other solution? Am using OS 10.4.11 Thanks for any help
Hi
I actually dont think its Lion (sorry i put that as couldn't remember) as not on that computer at the moment, its at home, I am at work. I know CS2 is compatable with whatever OS I am using because I can using CS2 indesign etc and I was able to use CS2 photoshop until I updated the Camino browser (I believe this is when it stopped working). I have CS5 but it wont work at all on my Powerbook G4.
I can send a message later with the OS I am using and maybe you can suggest other help? They told me in the MAC shop to try and get the installation discs. They also said I would be able to get these via Apple's 'media replacement programme' which I cannot find anyway! To be honest, I am not even sure getting the install discs will work but I'll try whatever I need to try and get Photoshop working on it again!
Thanks -
I'm trying to update my iPad but it says I don't have enough available storage. But I have more than enough can anyone tell me what the problem is?
Well, we can't as we don't know what you consider as "more than enough". The built is quite heavy (like it can be 800mb) then it needs to be extracted to be installed before everything unneeded gets deleted...
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TS4009 How do I get a full uk refund for additional storage bought but realized not needed?
How do I get a full uk refund for additional storage bought but realized not needed?
All I wanted to do was upgrade my ipad 2 to ios 6 but in my settings it was greyed out and it told me I did not have enough storage to upgrade so I bought additional icloud storage and realised that this made no difference whatsoever
Now I was a refund but typical apple, one click to buy but a million and a phone call to get back
I just want this iPad upgraded and my refund for storage that aint storage!?? and someone to explain to me in LAYMAN's terms what the difference is between iPad storage and iCloud and what is the point if you cannot upgrade even though you bought more storage!?
Thank youiCloud: Photo Stream troubleshooting - Support - Apple
Use instructions to downgrade your storage.
difference in laymans terms is simple. You ipad has local storage. Icloud is storage on apple server, that people by to create backup. Local storage for ipad can not be expanded. New ipad with bigger storage can be purchased and Apple makes them is up to 128 gigs size. -
My ipod screen shows "not enough storage" message but will not let me click on the cancel or settings button. How do I fix this?
Try:
- Reset the iOS device. Nothing will be lost
Reset iOS device: Hold down the On/Off button and the Home button at the same time for at
least ten seconds, until the Apple logo appears.
- Restore from backup. See:
iOS: How to back up
- Restore to factory settings/new iOS device.
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