Which is Performance wise better MOVE or MOVE CORRESPONDING ...
Hi SAP-ABAP Experts .
Which is Performance wise better ...
MOVE or MOVE CORRESPONDING .
Regards : Rajneesh
> A
>
> * access path and indexes
Indexes and hence access paths are defined when you design the data model. They are part of the model design.
> * too large numbers of records or executions
consider a datawarehouse environment - you have to deal with huge loads of data. a Million records are considered "small" here. Terms like "small" or "large" are depending on the context you are working in.
If you never heard of Star transformation, Partitioning and Parallel Query you will get lost here!
OLTP is different: you have short transactions, but a huge number of concurrent users.
You would not even consider Bitmap indexes in an OLTP environment - but maybe a design that evenly distributes data blocks over several files for avoiding hot spots on heavily used tables.
> * processing of internal tables => no quadratic coding
>
> these are the main performance issues!
>
> > Performance is defined at design time
> partly yes, but more is determined during runtime, you must check everything at least once. Many things can go wrong and will go wrong.
sorry, it's all about the data model design - sure you have to tune later in the development but you really can't tune successfully on a BAD data model ... you have to redesign.
If the model is good there is a chance the developers chooses the worst access to it , but then you have the potential to tune with success because your model allows for a better access strategy.
The decisions you make in the design phase are detemining the potential for tuning later.
>
> * database does not what you expect
I call this the black box view: The developer is not interested in the underlying database.
Why we have different DB vendors if they would all behave the same way? I.e. compare concurrency
and consistency implementations in various DB's - totally different. You can't simply apply your working knowledge from one database to another DB product. I learned the hard way while implementing on INFORMIX and ORACLE...
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Processing in 2 internal tables -Performance wise better option
Hi Experts,
I have 2 internal tables.
ITAB1 and ITAB2 both are sorted by PSPHI.
ITAB1 has PSPHI some more fields INVOICE DATE and AMT
ITAB2 has PSPHI some more fields amount.
Both itab1 and itab2 will always have same amount of data.
I need to filter data from ITAB2 based invoice date given on selection screen.since ITAB2 doesnt have invoice date field.
i am doing further processing to filter the records.
I have thought of below processing logic and wanted to know if there is a better option performance wise?
loop at ITAB1 into wa where invoice_date > selection screen date. (table which has invoice date)
lv_index = sy-tabix.
read table itab2 where psphi = wa-psphi and index = lv_index.
if sy-subrc = 0.
delete itab2 index lv_index.
endif.
endloop.Hi Madhu,
My Requirement is as below could you please advice on this ?
ITAB1
Field 1 PSPHI , FIELD 2 INVOICE, FIELD 3 INVOICE_DATE , FIELD4 AMT
15245, INV1, 02/2011 , 400
15245 INV2 02/2012 , 430
ITAB2
Field 1 PSPHI , FIELD 2 PSNR, FIELD 3 MATNR , FIELD4 AMT
15245, PSNR1, X . 430
15245 IPSNR2 Y, 400
When user enteres date on sel screen as 02/2011
I want to delete the data from itab1 and itab2 for invoice date greater then 02/2011/
If i delere ITAB1 for date > selection screen date.
Loop itab1.
delete itab2 where psphi in itab1 will delete both rows in above example because the field psphi which is common can be mutiple.
endloop.
Can you advice ? -
Difference between Temp table and Variable table and which one is better performance wise?
Hello,
Anyone could you explain What is difference between Temp Table (#, ##) and Variable table (DECLARE @V TABLE (EMP_ID INT)) ?
Which one is recommended to use for better performance?
also Is it possible to create CLUSTER and NONCLUSTER Index on Variable table?
In my case: 1-2 days transactional data are more than 3-4 Millions. I tried using both # and table variable and found table variable is faster.
Is that Table variable using Memory or Disk space?
Thanks Shiven:) If Answer is Helpful, Please VoteCheck following link to see differences b/w TempTable & TableVariable: http://sqlwithmanoj.com/2010/05/15/temporary-tables-vs-table-variables/
TempTables & TableVariables both use memory & tempDB in similar manner, check this blog post: http://sqlwithmanoj.com/2010/07/20/table-variables-are-not-stored-in-memory-but-in-tempdb/
Performance wise if you are dealing with millions of records then TempTable is ideal, as you can create explicit indexes on top of them. But if there are less records then TableVariables are good suited.
On Tables Variable explicit index are not allowed, if you define a PK column, then a Clustered Index will be created automatically.
But it also depends upon specific scenarios you are dealing with , can you share it?
~manoj | email: http://scr.im/m22g
http://sqlwithmanoj.wordpress.com
MCCA 2011 | My FB Page -
Performance wise which is better NOT IN or NOT EXISTS
Performance wise which is better NOT IN or NOT EXISTS.
also that not exists is not equivalent to not in
SQL> select * from dept where not exists (select * from emp where dept.deptno=comm);
DEPTNO DNAME LOC
10 ACCOUNTING NEW YORK
20 RESEARCH DALLAS
30 SALES CHICAGO
40 OPERATIONS BOSTON
SQL> select * from dept where deptno not in (select comm from emp);
no rows selectedin most case, Oracle internally rewrite a NOT IN in a NOT EXISTS, because NOT EXISTS usually performs better.
HTH
Laurent -
Performance wise which is best extends Thread Class or implement Runnable
Hi,
Which one is best performance wise extends Thread Class or implement Runnable interface ?
Which are the major difference between them and which one is best in which case.Which one is best performance wise extends Thread Class or implement Runnable interface ?Which kind of performance? Do you worry about thread creation time, or about execution time?
If the latter, then don't : there is no effect on the code being executed.
If the former (thread creation), then browse the API Javadoc about Executor and ExecutorService , and the other execution-related classes in the same package, to know about the usage of the various threading/execution models.
If you worry about, more generally, throughput (which would be a better concern), then it is not impacted by whether you have implemented your code in a Runnable implementation class, or a Thread subclass.
Which are the major difference between them and which one is best in which case.Runnable is almost always better design-wise :
- it will eventually be executed in a thread, but it leaves you the flexibility to choose which thread (the current one, another thread, another from a pool,...). In particular you should read about Executor and ExecutorService as mentioned above. In particular, if you happen to actually have a performance problem, you can change the thread creation code with little impact on the code being executed in the threads.
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I have three pages of apps, not all of which are full. How do I move apps from one page to another to have full pages?
Hook your iPad up to your computer and iTunes and move them from within iTunes.
Or
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Which SQL query performance is better
Putting this in a new thread so that i dont confuse and mix the query with my similiar threads.
Based on all of your suggestions for the below query,i finally came up with 2 RESOLUTIONS possible for it.
So,which would be the best in PERFORMANCE from the 2 resolutions i pasted below?I mean which will PERFORM FASTER and is more effecient.
***The original QUERY is at the bottom.
Resolution 1:-/***Divided into 2 sep. queries and using UNION ALL ****/ Is UNION ALL costly?
SELECT null, null, null, null, null,null, null, null, null,
null,null, null, null, null, null,null,null, count(*) as total_results
FROM
test_person p,
test_contact c1,
test_org_person porg
WHERE p.CLM_ID ='11' and
p.person_id = c1.ref_id(+)
AND p.person_id = porg.o_person_id
and porg.O_ORG_ID ='11'
UNION ALL
SELECT lastname, firstname,person_id, middlename,socsecnumber,
birthday, U_NAME,
U_ID,
PERSON_XML_DATA,
BUSPHONE,
EMLNAME,
ORG_NAME,
EMPID,
EMPSTATUS,
DEPARTMENT,
org_relationship,
enterprise_name,
null
FROM
SELECT
beta.*, rownum as alpha
FROM
SELECT
p.lastname, p.firstname, p.person_id, p.middlename, p.socsecnumber,
to_char(p.birthday,'mm-dd-yyyy') as birthday, p.username as U_NAME,
p.clm_id as U_ID,
p.PERSON_XML_DATA.extract('/').getStringVal() AS PERSON_XML_DATA,
c1.CONTACT_DATA.extract('//phone[1]/number/text()').getStringVal() AS BUSPHONE,
c1.CONTACT_DATA.extract('//email[2]/address/text()').getStringVal() AS EMLNAME,
c1.CONTACT_DATA.extract('//company/text()').getStringVal() AS ORG_NAME,
porg.emplid as EMPID, porg.empl_status as EMPSTATUS, porg.DEPARTMENT,
porg.org_relationship,
porg.enterprise_name
FROM
test_person p,
test_contact c1,
test_org_person porg
WHERE p.CLM_ID ='11' and
p.person_id = c1.ref_id(+)
AND p.person_id = porg.o_person_id
and porg.O_ORG_ID ='11'
ORDER BY
upper(p.lastname), upper(p.firstname)
) beta
WHERE
alpha BETWEEN 1 AND 100
Resolution 2:-
/****here,the INNER most count query is removed ****/
select *
FROM
SELECT
beta.*, rownum as alpha
FROM
SELECT
p.lastname, p.firstname, p.person_id, p.middlename, p.socsecnumber,
to_char(p.birthday,'mm-dd-yyyy') as birthday, p.username as U_NAME,
p.clm_id as U_ID,
p.PERSON_XML_DATA.extract('/').getStringVal() AS PERSON_XML_DATA,
c1.CONTACT_DATA.extract('//phone[1]/number/text()').getStringVal() AS BUSPHONE,
c1.CONTACT_DATA.extract('//email[2]/address/text()').getStringVal() AS EMLNAME,
c1.CONTACT_DATA.extract('//company/text()').getStringVal() AS ORG_NAME,
porg.emplid as EMPID, porg.empl_status as EMPSTATUS, porg.DEPARTMENT,
porg.org_relationship,
porg.enterprise_name,
COUNT(*) OVER () cnt -----This is the function
FROM
test_person p,
test_contact c1,
test_org_person porg
WHERE p.CLM_ID ='11' and
p.person_id = c1.ref_id(+)
AND p.person_id = porg.o_person_id
and porg.O_ORG_ID ='11'
ORDER BY upper(p.lastname), upper(p.firstname)
) beta
WHERE
alpha BETWEEN 1 AND 100
ORIGINAL QUERY
SELECT
FROM
SELECT
beta.*, rownum as alpha
FROM
SELECT
p.lastname, p.firstname, porg.DEPARTMENT,
porg.org_relationship,
porg.enterprise_name,
SELECT
count(*)
FROM
test_person p, test_contact c1, test_org_person porg
WHERE
p.p_id = c1.ref_id(+)
AND p.p_id = porg.o_p_id
$where_clause$
) AS results
FROM
test_person p, test_contact c1, test_org_person porg
WHERE
p.p_id = c1.ref_id(+)
AND p.p_id = porg.o_p_id
$where_clause$
ORDER BY
upper(p.lastname), upper(p.firstname)
) beta
WHERE
alpha BETWEEN #startRec# AND #endRec#I have now run the explain plans and put them below seperately for each SQL.The SQL queries for each of the items are posted in the 1st post of this thread.
***The original QUERY is at the bottom.
Resolution 1:-/***Divided into 2 sep. queries and using UNION ALL ****/ Is UNION ALL costly?
EXPLAIN PLANS SECTION
1- Original
Plan hash value: 1981931315
| Id | Operation | Name | Rows | Bytes |TempSpc| Cost (%CPU)| Time |
| 0 | SELECT STATEMENT | | 22859 | 187M| | 26722 (81)| 00:05:21 |
| 1 | UNION-ALL | | | | | | |
| 2 | SORT AGGREGATE | | 1 | 68 | | | |
| 3 | MERGE JOIN OUTER | | 22858 | 1517K| | 5290 (1)| 00:01:04 |
| 4 | MERGE JOIN | | 22858 | 982K| | 4304 (1)| 00:00:52 |
|* 5 | INDEX RANGE SCAN | test_org_person_I3 | 24155 | 542K| | 363 (1)| 00:00:05 |
|* 6 | SORT JOIN | | 22858 | 468K| 1448K| 3941 (1)| 00:00:48 |
|* 7 | TABLE ACCESS FULL | test_PERSON | 22858 | 468K| | 3716 (1)| 00:00:45 |
|* 8 | SORT JOIN | | 68472 | 1604K| 4312K| 985 (2)| 00:00:12 |
| 9 | INDEX FAST FULL SCAN | test_CONTACT_FK1 | 68472 | 1604K| | 113 (1)| 00:00:02 |
|* 10 | VIEW | | 22858 | 187M| | 21433 (1)| 00:04:18 |
| 11 | COUNT | | | | | | |
| 12 | VIEW | | 22858 | 187M| | 21433 (1)| 00:04:18 |
| 13 | SORT ORDER BY | | 22858 | 6875K| 14M| 21433 (1)| 00:04:18 |
| 14 | MERGE JOIN OUTER | | 22858 | 6875K| | 18304 (1)| 00:03:40 |
| 15 | MERGE JOIN | | 22858 | 4397K| | 11337 (1)| 00:02:17 |
| 16 | SORT JOIN | | 22858 | 3013K| 7192K| 5148 (1)| 00:01:02 |
|* 17 | TABLE ACCESS FULL | test_PERSON | 22858 | 3013K| | 3716 (1)| 00:00:45 |
|* 18 | SORT JOIN | | 24155 | 1462K| 3800K| 6189 (1)| 00:01:15 |
| 19 | TABLE ACCESS BY INDEX ROWID| test_ORG_PERSON | 24155 | 1462K| | 5535 (1)| 00:01:07 |
|* 20 | INDEX RANGE SCAN | test_ORG_PERSON_FK1| 24155 | | | 102 (1)| 00:00:02 |
|* 21 | SORT JOIN | | 68472 | 7422K| 15M| 6968 (1)| 00:01:24 |
| 22 | TABLE ACCESS FULL | test_CONTACT | 68472 | 7422K| | 2895 (1)| 00:00:35 |
Predicate Information (identified by operation id):
5 - access("PORG"."O_ORG_ID"='11')
6 - access("P"."PERSON_ID"="PORG"."O_PERSON_ID")
filter("P"."PERSON_ID"="PORG"."O_PERSON_ID")
7 - filter("P"."CLM_ID"='11')
8 - access("P"."PERSON_ID"="C1"."REF_ID"(+))
filter("P"."PERSON_ID"="C1"."REF_ID"(+))
10 - filter("ALPHA"<=25 AND "ALPHA">=1)
17 - filter("P"."CLM_ID"='11')
18 - access("P"."PERSON_ID"="PORG"."O_PERSON_ID")
filter("P"."PERSON_ID"="PORG"."O_PERSON_ID")
20 - access("PORG"."O_ORG_ID"='11')
21 - access("P"."PERSON_ID"="C1"."REF_ID"(+))
filter("P"."PERSON_ID"="C1"."REF_ID"(+))
-------------------------------------------------------------------------------terprise_name
Resolution 2:-
EXPLAIN PLANS SECTION
1- Original
Plan hash value: 1720299348
| Id | Operation | Name | Rows | Bytes |TempSpc| Cost (%CPU)| Time |
| 0 | SELECT STATEMENT | | 23518 | 13M| | 11545 (1)| 00:02:19 |
|* 1 | VIEW | | 23518 | 13M| | 11545 (1)| 00:02:19 |
| 2 | COUNT | | | | | | |
| 3 | VIEW | | 23518 | 13M| | 11545 (1)| 00:02:19 |
| 4 | WINDOW SORT | | 23518 | 3536K| | 11545 (1)| 00:02:19 |
| 5 | MERGE JOIN OUTER | | 23518 | 3536K| | 11545 (1)| 00:02:19 |
| 6 | MERGE JOIN | | 23518 | 2985K| | 10587 (1)| 00:02:08 |
| 7 | SORT JOIN | | 23518 | 1561K| 4104K| 4397 (1)| 00:00:53 |
|* 8 | TABLE ACCESS FULL | test_PERSON | 23518 | 1561K| | 3716 (1)| 00:00:45 |
|* 9 | SORT JOIN | | 24155 | 1462K| 3800K| 6189 (1)| 00:01:15 |
| 10 | TABLE ACCESS BY INDEX ROWID| test_ORG_PERSON | 24155 | 1462K| | 5535 (1)| 00:01:07 |
|* 11 | INDEX RANGE SCAN | test_ORG_PERSON_FK1| 24155 | | | 102 (1)| 00:00:02 |
|* 12 | SORT JOIN | | 66873 | 1567K| 4216K| 958 (2)| 00:00:12 |
| 13 | INDEX FAST FULL SCAN | test_CONTACT_FK1 | 66873 | 1567K| | 110 (1)| 00:00:02 |
Predicate Information (identified by operation id):
1 - filter("ALPHA"<=25 AND "ALPHA">=1)
8 - filter("P"."CLM_ID"='11')
9 - access("P"."PERSON_ID"="PORG"."O_PERSON_ID")
filter("P"."PERSON_ID"="PORG"."O_PERSON_ID")
11 - access("PORG"."O_ORG_ID"='11')
12 - access("P"."PERSON_ID"="C1"."REF_ID"(+))
filter("P"."PERSON_ID"="C1"."REF_ID"(+))
ORIGINAL QUERY
EXPLAIN PLANS SECTION
1- Original
Plan hash value: 319284042
| Id | Operation | Name | Rows | Bytes |TempSpc| Cost (%CPU)| Time |
| 0 | SELECT STATEMENT | | 22858 | 187M| | 21433 (1)| 00:04:18 |
|* 1 | VIEW | | 22858 | 187M| | 21433 (1)| 00:04:18 |
| 2 | COUNT | | | | | | |
| 3 | VIEW | | 22858 | 187M| | 21433 (1)| 00:04:18 |
| 4 | SORT ORDER BY | | 22858 | 6875K| 14M| 21433 (1)| 00:04:18 |
| 5 | MERGE JOIN OUTER | | 22858 | 6875K| | 18304 (1)| 00:03:40 |
| 6 | MERGE JOIN | | 22858 | 4397K| | 11337 (1)| 00:02:17 |
| 7 | SORT JOIN | | 22858 | 3013K| 7192K| 5148 (1)| 00:01:02 |
|* 8 | TABLE ACCESS FULL | test_PERSON | 22858 | 3013K| | 3716 (1)| 00:00:45 |
|* 9 | SORT JOIN | | 24155 | 1462K| 3800K| 6189 (1)| 00:01:15 |
| 10 | TABLE ACCESS BY INDEX ROWID| test_ORG_PERSON | 24155 | 1462K| | 5535 (1)| 00:01:07 |
|* 11 | INDEX RANGE SCAN | test_ORG_PERSON_FK1| 24155 | | | 102 (1)| 00:00:02 |
|* 12 | SORT JOIN | | 68472 | 7422K| 15M| 6968 (1)| 00:01:24 |
| 13 | TABLE ACCESS FULL | test_CONTACT | 68472 | 7422K| | 2895 (1)| 00:00:35 |
Predicate Information (identified by operation id):
1 - filter("ALPHA"<=25 AND "ALPHA">=1)
8 - filter("P"."CLM_ID"='1862')
9 - access("P"."PERSON_ID"="PORG"."O_PERSON_ID")
filter("P"."PERSON_ID"="PORG"."O_PERSON_ID")
11 - access("PORG"."O_ORG_ID"='1862')
12 - access("P"."PERSON_ID"="C1"."REF_ID"(+))
filter("P"."PERSON_ID"="C1"."REF_ID"(+))
-------------------------------------------------------------------------------Edited by: user10817659 on Feb 19, 2009 11:47 PM
Edited by: user10817659 on Feb 21, 2009 12:23 AM -
We have many mappings, which one is good in performance wise ?
We have many mappings, which one is good in performance wise ?
HI
Different Mapping Techniques are available in XI. They are: Message Mapping, XSLT Mapping, Java Mapping and ABAP mapping.
u2022The integration repository includes a graphical mapping editor. It includes built-in functions for value transformations and queue and context handling. There is an interface for writing user-defined functions (java) as well.
u2022XSLT mappings can be imported into the Integration Repository; java methods can be called from within the XSLT style sheet. Advantages of this mapping are: open standard, portable, extensible via Java user-defined functions.
u2022If the transformation is very complex, it may be easiest to leverage the power of Java for mapping.
u2022ABAP mapping programs can also be written to transform the message structures.
Message Mapping
SAP XI provides a graphical mapping tool that generates a java mapping program to be called at run time.
u2022Graphically define mapping rules between source and target message types.
u2022Queue-based model allows for handling of extremely large documents.
u2022Drag-and-drop.
u2022Generates internal Java Code.
u2022Built-in and user-defined functions (in Java)
u2022Integrated testing tool.
u2022N:M mapping is possible.
JAVA MAPPING:
Usually Java mapping is preferred when the target structure is relatively complex and the transformation cannot be accomplished by simple graphical mapping.
For e.g. consider a simple File->IDoc scenarion where the source file is a simple XML file, whereas the target file is an IDoc with more than one hierarchy level e.g FINSTA01. Content conversion in XI can only create a single level hierarchy, so in this scenario a Java mapping would come in handy.
See these:
http://help.sap.com/saphelp_nw04/helpdata/en/e2/e13fcd80fe47768df001a558ed10b6/frameset.htm
https://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/10dd67dd-a42b-2a10-2785-91c40ee56c0b
/people/prasad.ulagappan2/blog/2005/06/29/java-mapping-part-i
/people/thorsten.nordholmsbirk/blog/2006/08/10/using-jaxp-to-both-parse-and-emit-xml-in-xi-java-mapping-programs
When to use Java mapping
1) Java mapping are used when graphical mapping cannot help you.
Advantages of Java Mapping
1)you can use Java APIs and Classes in it.
2) file look up or a DB lookup is possible
3) DOM is easier to use with lots of classes to help you create nodes and elements.
Java mapping can be used when you have complex mapping structures.
ABAP MAPPING:
ABAP mappings are mapping programs in ABAP objects that customers can implement using the ABAP Workbench.
An ABAP mapping comprises an ABAP class that implements the interface IF_MAPPING in the package SAI_MAPPING. The interface has a method EXECUTE with the some signature.
Applications can decide themselves in the method EXECUTE how to import and change the source XML document. If you want to use the XSLT processor of SAP Web AS, you can use the ABAP Workbench to develop a stylesheet directly rather than using ABAP mappings.
In ABAP mapping you can read access message header fields. To do this, an object of type IF_MAPPING_PARAM is transferred to the EXECUTE method. The interface has constants for the names of the available parameters and a method GET, which returns the respective value for the parameter name. The constants are the same as in Java mappings, although the constant MAPPING_TRACE does not exist for ABAP mappings. Instead, the trace object is transferred directly using the parameter TRACE of the method IF_MAPPING~EXECUTE.
For more details refer
http://help.sap.com/saphelp_nw70/helpdata/EN/ba/e18b1a0fc14f1faf884ae50cece51b/frameset.htm
https://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/5c46ab90-0201-0010-42bd-9d0302591383
https://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/docs/library/uuid/e3ead790-0201-0010-64bb-9e4d67a466b4
/people/sameer.shadab/blog/2005/09/29/testing-abap-mapping
ABAP Mapping
/people/udo.martens/blog/2006/08/23/comparing-performance-of-mapping-programs
https://websmp101.sap-ag.de/~sapdownload/011000358700003082332004E/HowToABAPMapping.pdf
/people/ravikumar.allampallam/blog/2005/02/10/different-types-of-mapping-in-xi
/people/r.eijpe/blog
ABAP Mapping Vs Java Mapping.
Re: Message Mapping of type ABAP Class not being shown
Re: Performance of mappings (JAVA, XSLT, ABAP)
XSLT Mapping
XSLT stands for EXtensible Stylesheet Language Transformations. It is an XML based language for transforming XML documents into any other formats suitable for browser to display, on the basis of set of well-defined rules.
/people/sap.user72/blog/2005/03/15/using-xslt-mapping-in-a-ccbpm-scenario
/people/anish.abraham2/blog/2005/12/22/file-to-multiple-idocs-xslt-mapping
The above menotined are the mapping present in the XI.
When it is critical and complicate we go for the ABAP,JAVA or XSLt mapping. For simple Mapping we go for the graphical mapping.
the selection of mapping also depends upon the requirement and alos on our scenario.
cheers -
My wife is converting from iPhoto to Aperture due to large library ( 33,000 photos, 109GB). Performance-wise, is it better to convert to Aperture library and leave on the 250GB internal drive or convert and store externally?
You are welcome.
convert and store externally?
What versions of iPhoto and Aperture is your wife using? With both iPhoto 9.3 or later and Aperture 3.3 or later she simply could open her iPhoto library in Aperture and be done, since these versions are using a unified library format.
Aperture 3.3: Using a unified photo library with iPhoto and Aperture -
The accursed little dark gray ball with white in the center and white arrows, either two or four, which seize control of the screen and move the text or pictures up, down, left, right and can be stopped only by finding the ball and clicking it. I want to stop the thing permanently. Firefox 3.6 and 3.64
== This happened ==
Every time Firefox opened
== with 3.60The accursed little dark gray ball with white in the center and white arrows, either two or four, which seize control of the screen and move the text or pictures up, down, left, right and can be stopped only by finding the ball and clicking it. I want to stop the thing permanently. Firefox 3.6 and 3.64
== This happened ==
Every time Firefox opened
== with 3.60 -
Which one will get better performance when traversing an ArrayList, iterat
hi, everyone,
Which one will get better performance when traversing an ArrayList, iterators, or index(get(i))?
Any reply would be valuable.
Thank you in advance.Use the iterator, or a foreach loop, which is just syntactic sugar over an iterator. The cases where there is a noticeable difference will be extremely rare. You would only use get() if you actually measured a bottleneck, changed it, re-tested, and found significant improvement. An iterator will give O(n) time for iterating over any collection. Using get() only works on Lists, and for a LinkedList, gives O(n^2).
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Should I get the 15" or 17" MacBook Pro? I will mainly be using it for browsing, gaming, photo-editing, chatting, movies, etc. and I don't know if I should get the 15 or 17 inch model.... also, should I go for the 8GB of RAM upgrade... or is 4GB enough for what I will be doing? Also, where can I get windows 7 retail for bootcamp?
Thanks.
PS - does anyone know which size GaGa's laptop is? It was in an hbo teaser, and I would just like to know... thanksAJ,
I have the 15" inch MacBook Pro and I totally recommend it over the 17" MacBook Pro.The 15" MacBook Pro is right in the middle of the MacBook Pro product line-up and it operates perfectly fine for the things you wanna use it for.The 13" MacBook Pro is a let down because if you like to keep up with apple,it needs to updraded frequently and besides,it's always behind on processing technology,but if you don't have very much money and your a college student,then I owuld recommend it.The 17" MacBook Pro is relativley large.The 17" is kind of like a hassle because of the size of it and it's not much better than the MacBook Pro,but I would recommend it to you if your interested in having a laptop that you won't move around very often.Overall,I would recommend to you the 15" MacBook Pro.The 15" is just right because of the size and protability of the machine.I have a boot camp partition with Windows 7 installed on it and I use netflix via the Windows Media Center and movies play at an excellent rate of speed and it's even better watching a movie on a purchased DVD on the Apple DVD Player and it doesn't lag at all even with some simple browsing applications open such as Safari.Chatting on the 15" is also convienient with a new feature that Apple released called FaceTime.With FaceTime,you can chat with others that have an iDevice and a registered FaceTime account.In case you use a program like Skype,that's also available for Apple's Mac OS X and would be great for video chatting and not to mention that iChat is another great video chat client for Mac.If you don't already know,the MacBook Pros already have built in "iSight" cameras built in.Photo-editting is great on a mac system with the applications that are available for it such as Adobe Photoshop.Gaming is coming along great with a new app hub called the Apple Mac App Store.This application allows developers to publish there newly optimized for Mac OS X games and other content all into 1 market that allows a user to choose from one of the most excellent games out there for the Macintosh operating system.You can also play a lot of your Windows games on your mac with boot camp which allows you to partition your hard drive for Windows,so you can run your Windows programs natively on your Mac,but if you do choose to do gaming frequently on a Mac,then try upgrading the RAM on your MacBook Pro 15" before purchasing it with only 4GB DDR3.Before I end my recommendation,I wanna suggest that you get a slot state hard drive (SSD) if you have enough for it.A solid state hard drive on the MacBook Pro is very convienient to boost the overall performance on the MacBook Pro.I Hope This Helps!
-Michael Phillips -
Which Os x is better for a MacBook 1.1?
Hi.
Which Os x is better for a MacBook White 1.1.For Networking,movies and music.
10.5.8 or 10.6.8 ?
spec: 1.83 Ghz Intel Core Duo
1 Gb ddr2
ThanksYou need to install 10.6.8 because 10.5.8 is no longer receiving security updates and increasingly applications are not compatible with it. However, I recommend increasing your RAM from 1 GB to at least 2 GB, 4 if your system will support.
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