Optimizer factors

Hello,
DB version 11gR2
If we joining multiple tables based on what factors optimizer decide driving table?
Thanks.

784585 wrote:
Hello,
DB version 11gR2
If we joining multiple tables based on what factors optimizer decide driving table?
Thanks.That's really not a question that can be answered with absolute white and black kind of answer. The number of values in the join predicates, the no of distinct values, data in the tables, availability of indexes etc etc, all would be involved in deciding the plan. Essentially, the focus would be on to find the best plan which is available at that point of time.
Aman....

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Hi 2 all, I have MacBook Pro with Mac OS X Lion 10.7.4 and when Mountain Lion will be introduced I want to ERASE all information including all partitions from my HDD and install Mountain Lion on fully cleared Mac. And there is a question. I created Time Machine backup and I think that this backup include in itself my previous (Lion) operating system. But on my NEW system (Mountain Lion) I want only to restore apps and photos from iPhoto. How can I restore from Time Machine backup only some informations like apps and photos?
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TimeMachine doesn't have a highly selectable restore option, it's really a all or nothing approach.
I assume you want to do this for hard drive performance and privacy reasons, because if you have a SSD there is no need for performance, just privacy reasons.
It's because 10.7 will only be removed and 10.8 put into it's place if you choose to upgrade to 10.8, likely on the slower part of the hard drive, Applications and User accounts will be left alone.
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3: Reboot and setup using the same user name (so your iTunes playlists etc will work) different password is fine.
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http://roaringapps.com/apps:table
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Free iWeb SEO Tool to Help Improve Search Engine Rankings

Hi,
I have just posted a free iWeb SEO Tool that will let you add and edit all your meta tags and header information, as well as a few other important search engine optimization factors. Here is a brief description of what it can do;
iWeb SEO Tool is the only software that makes it easy to get your iWeb built website ready for search engines.
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Features include;
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1. To publish to .Mac just mount your iDisk and go to Web/Sites/ and you will see your old site there. Delete that site and just copy your new site to the location.
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Hello,
I have a customer network of 30 WAE's connected to an MPLS cloud. Interception method is inline for all WAE, and WCCP for NM-WAE.
Of those WAE's (running 4.1.1c), I have 3 that are connected in Datacenters, as such they are expected to receive most of the traffic and have been dimensioned as OE7341 appliances.
It is my impression that this network statistics are not as good as they should be: Some of the optimizations factor are at 1.2 or 1.3X and most are simply 1.0X.
My impression is that there is a lot of passthrough traffic, and although some of it is configured as so on the application policies, when I check statistics pass-through on several WAE's on the network I see that the Rjct Resources is very high in a particular WAE in a Datacenter - that has a 7341 Box (12Gb RAM!) - and I also do get non-zero counters on other boxes.
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sghmansin--17w#
sh statistics pass-through
Outbound
PT Client:
Bytes 4081578138946
Packets 11567591648
PT Server:
Bytes 8833662508567
Packets 13797553929
Active Completed
Overall 0 0
No Peer 7 141742513
Rjct Capabilities 0 0
Rjct Resources 65 273669865
App Config 6 25610854
Global Config 0 0
Asymmetric 1 1597096
In Progress 97 453847516
Intermediate 0 0
Overload 0 0
Internal Error 0 478
App Override 0 0
Server Black List 0 150553
AD Version Mismatch 0 0
sghmansin--17w#
One other observation is that pass-through through asymetric is also very frequent. Given that the customer is mostly using inline interception, even if a connection comes through a WAN/LAN interface pair and exits through another, the optimization should still be done.
The datacenter designs are dual-homed active/passive, and traffic goes through the same (and only) WAE box. The customer assures me that there is no asymetrical traffic.
Can anybody explain to me how is the decision made to mark a given flow as asymmetrical (and them pass-through it)?
Thanks
Gustavo Novais

Hi Dan, Thank you for your reply.
That show was just from one of the boxes, in this case on the Datacenter.
For instance I also see asymetricals in NM-WAE's configured for WCCP. But the number is not that substantial, which makes me believe the interception is well configured (unfortunately the routers are managed by a third party, and I am yet to have access to their config).
All boxes on this network have Enterprise License activated.
How can I check on a given moment all connections count on the box? is there any MIB oid pollable to check that?
Do passthrough connections count to the overall limit?
While doing the diagnostics on the WAAS devices there was in deed a WAAS device marked as having asymetrical traffic, but many others have PT Asym connections and have not been marked as such by the diagnostics?
How does the diagnostic work? Is it a instantaneous dianostic (i.e. checks connection table at time T to see if any of the current connections is PT Asym )?
If on the far end of a connection we do have an asymetrical network topology, does the near end also mark the same connection as PT Asym, or will it simply say No Peer?
thanks
Thanks

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4. Lighting
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This is related to Blog by Mr Prakash Darji regarding "Query Optimization" posted on Jan 26 2006.In this to optimize query Generation of Report is suggested.
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I collected Stats data before and after Generation of Report.But how to be sure that this is helping me? Did any one has tried this?
What to look for in Stats Data - duration?
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Message was edited by: Gaurav

Any ideas Experts?

Subquery Factoring and Materialized Hint

WITH t AS
        (SELECT MAX (lDATE) tidate
           FROM rate_Master
          WHERE     Code = 'G'
                AND orno > 0
                AND TYPE = 'L'
                AND lDATE <= ':entereddate')
SELECT DECODE (:p1, 'B', RateB, 'S', RateS, Rate)
FROM rate_Master, t
WHERE     Code = 'G'
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Secondly adding the /*+ Materialize */ hint to a With query is mandatory or the optimizer by itself will do it and make a temp table transformation. In my example i am forced to give the hint in the query. Please discuss and help
Thanks in advance.

ramarun wrote:
WITH t AS
(SELECT MAX (lDATE) tidate
FROM rate_Master
WHERE     Code = 'G'
AND orno > 0
AND TYPE = 'L'
AND lDATE <= ':entereddate')
SELECT DECODE (:p1, 'B', RateB, 'S', RateS, Rate)
FROM rate_Master, t
WHERE     Code = 'G'
AND orno > 0
AND TYPE = 'L'
AND NVL (lDATE, SYSDATE) = tidate;In the given example the sub query returns just one row because of the aggregate function max. Making this in to a With clause will be of any benefit ? Also i presume/understand that the subquery factoring would be really useful only when we try to make a sub query which returns more rows in a with clause. Is my intrepration right?I am not aware of any performance Benefit due to use of With clause. IMO, It eases the job to write a Subquery multiple times in a query.
The solution you adopted has to hit the cache twice and hence do not look very performant. I will advise you to opt for Analytic functions (like the suggestion I provided in another thread). If the solution does not yeild correct results, then provide with a Script that we can replicate (Create table, Sample Insert statement and the expected output).
select decode(:p1, 'B', RateB, 'S', RateS, Rate)
   from (
            select RateB, RateS, Rate, NVL(ldate, sysdate) ldate, dense_rank() over (order by case when NVL(lDATE, SYSDATE) <= ':entereddate' then NVL(lDATE, SYSDATE) else to_date('01/01/1970', 'DD/MM/YYYY' end DESC) rn
              from rate_Master
           where Code = 'G'
               and orno > 0
               and type = 'L'
         ) a
where a.rn = 1;>
Secondly adding the /*+ Materialize */ hint to a With query is mandatory or the optimizer by itself will do it and make a temp table transformation. In my example i am forced to give the hint in the query. Please discuss and help
Usage of Hints is only for Debugging purposes and is not meant to be used in production code. It is when you have to ascertain the reason for CBO choosing a plan that you do not expect it to take, you use hints to force your plan and find the cost and analyze it. Hence, I do not support the idea of Hints for production code.

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Critical materials are kept in warehouses as safety stocks. Each location has its own safety stock for its own spare parts. That leads to duplicate stocking of similar materials at different locations. To optimize the inventories and reduce their costs, it is suggested to consolidate similar materials at certain locations and allow all other locations to use it. By doing so, huge cost savings can be realized.
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It looks like we are facing a SQL Server 2008R2 queery optimizer memory leak.
We have below version of SQL Server
Microsoft SQL Server 2008 R2 (SP2) - 10.50.4000.0 (X64)
Jun 28 2012 08:36:30
Copyright (c) Microsoft Corporation
Standard Edition (64-bit) on Windows NT 6.1 <X64> (Build 7601: Service Pack 1)
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7.11.2014 22:40:57
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2014-11-08 01:22:48.70 spid75       Failed allocate pages: FAIL_PAGE_ALLOCATION 1
And then tons of below errors
2014-11-08 01:24:02.22 spid87      There is insufficient system memory in resource pool 'internal' to run this query.
2014-11-08 01:24:02.22 Server      Error: 17300, Severity: 16, State: 1. (Params:). The error is printed in terse mode because there was error during formatting. Tracing, ETW, notifications etc are skipped.
2014-11-08 01:24:02.22 Server      Error: 17300, Severity: 16, State: 1. (Params:). The error is printed in terse mode because there was error during formatting. Tracing, ETW, notifications etc are skipped.
2014-11-08 01:24:02.30 Server      Error: 17312, Severity: 16, State: 1.
2014-11-08 01:24:02.30 Server      SQL Server is terminating a system or background task Fulltext Host Controller Timer Task due to errors in starting up the task (setup state 1).
2014-11-08 01:24:02.22 spid74      Error: 701, Severity: 17, State: 123.
2014-11-08 01:24:02.22 spid74      There is insufficient system memory in resource pool 'internal' to run this query.
2014-11-08 01:24:13.22 Server      Error: 17312, Severity: 16, State: 1. (Params:). The error is printed in terse mode because there was error during formatting. Tracing, ETW, notifications etc are skipped.
2014-11-08 01:24:13.22 spid87      Error: 701, Severity: 17, State: 123.
2014-11-08 01:24:13.22 spid87      There is insufficient system memory in resource pool 'internal' to run this query.
2014-11-08 01:24:13.22 spid63      Error: 701, Severity: 17, State: 130.
2014-11-08 01:24:13.22 spid63      There is insufficient system memory in resource pool 'internal' to run this query.
2014-11-08 01:24:13.22 spid57      Error: 701, Severity: 17, State: 123.
2014-11-08 01:24:13.22 spid57      There is insufficient system memory in resource pool 'internal' to run this query.
2014-11-08 01:24:13.22 Server      Error: 17300, Severity: 16, State: 1. (Params:). The error is printed in terse mode because there was error during formatting. Tracing, ETW, notifications etc are skipped.
2014-11-08 01:24:18.26 Server      Error: 17300, Severity: 16, State: 1. (Params:). The error is printed in terse mode because there was error during formatting. Tracing, ETW, notifications etc are skipped.
2014-11-08 01:24:24.43 spid81      Error: 701, Severity: 17, State: 123.
2014-11-08 01:24:24.43 spid81      There is insufficient system memory in resource pool 'internal' to run this query.
2014-11-08 01:24:18.25 Server      Error: 18052, Severity: -1, State: 0. (Params:). The error is printed in terse mode because there was error during formatting. Tracing, ETW, notifications etc are skipped.
2014-11-08 01:24:18.25 Server      BRKR TASK: Operating system error Exception 0x1 encountered.
2014-11-08 01:24:30.11 Server      Error: 17300, Severity: 16, State: 1. (Params:). The error is printed in terse mode because there was error during formatting. Tracing, ETW, notifications etc are skipped.
2014-11-08 01:24:30.11 Server      Error: 17300, Severity: 16, State: 1. (Params:). The error is printed in terse mode because there was error during formatting. Tracing, ETW, notifications etc are skipped.
2014-11-08 01:24:35.18 spid57      Error: 701, Severity: 17, State: 131.
2014-11-08 01:24:35.18 spid57      There is insufficient system memory in resource pool 'internal' to run this query.
2014-11-08 01:24:35.18 spid71      Error: 701, Severity: 17, State: 193.
2014-11-08 01:24:35.18 spid71      There is insufficient system memory in resource pool 'internal' to run this query.
2014-11-08 01:24:35.18 Server      Error: 17312, Severity: 16, State: 1. (Params:). The error is printed in terse mode because there was error during formatting. Tracing, ETW, notifications etc are skipped.
2014-11-08 01:24:35.41 Server      Error: 17312, Severity: 16, State: 1.
2014-11-08 01:24:35.41 Server      SQL Server is terminating a system or background task SSB Task due to errors in starting up the task (setup state 1).
2014-11-08 01:24:35.71 Server      Error: 17053, Severity: 16, State: 1.
2014-11-08 01:24:35.71 Server      BRKR TASK: Operating system error Exception 0x1 encountered.
2014-11-08 01:24:35.71 spid73      Error: 701, Severity: 17, State: 123.
2014-11-08 01:24:35.71 spid73      There is insufficient system memory in resource pool 'internal' to run this query.
2014-11-08 01:24:46.30 Server      Error: 17312, Severity: 16, State: 1. (Params:). The error is printed in terse mode because there was error during formatting. Tracing, ETW, notifications etc are skipped.
2014-11-08 01:24:51.31 Server      Error: 17053, Severity: 16, State: 1. (Params:). The error is printed in terse mode because there was error during formatting. Tracing, ETW, notifications etc are skipped.
2014-11-08 01:24:51.31 Server      Error: 17300, Severity: 16, State: 1. (Params:). The error is printed in terse mode because there was error during formatting. Tracing, ETW, notifications etc are skipped.
2014-11-08 01:24:51.31 Logon       Error: 18052, Severity: -1, State: 0. (Params:). The error is printed in terse mode because there was error during formatting. Tracing, ETW, notifications etc are skipped.
Last error message is half an hour after the inital Out of memory at 2014-11-08 01:52:54.03. Then the Instance is completely shut down
From the memory information in the error log we can see that all the memory is consumed by the QUERY_OPTIMIZER
Buffer Pool                                   Value
Committed                                   2621440
Target                                      2621440
Database                                     130726
Dirty                                          3682
In IO
0
Latched
1
Free
346
Stolen                                      2490368
Reserved                                          0
Visible                                     2621440
Stolen Potential                                  0
Limiting Factor                                  17
Last OOM Factor                                   0
Last OS Error                                     0
Page Life Expectancy                             28
2014-11-08 01:22:48.90 spid75
Process/System Counts                         Value
Available Physical Memory                29361627136
Available Virtual Memory                 8691842715648
Available Paging File                    51593969664
Working Set                               628932608
Percent of Committed Memory in WS               100
Page Faults                                48955000
System physical memory high                       1
System physical memory low                        0
Process physical memory low                       1
Process virtual memory low                        0
MEMORYCLERK_SQLOPTIMIZER (node 1)                KB
VM Reserved                                       0
VM Committed                                      0
Locked Pages Allocated                            0
SM Reserved                                       0
SM Committed                                      0
SinglePage Allocator                       19419712
MultiPage Allocator                             128
Memory Manager                                   KB
VM Reserved                               100960236
VM Committed                                 277664
Locked Pages Allocated                     21483904
Reserved Memory                                1024
Reserved Memory In Use                            0
On the other side MDW reports that the MEMORYCLERK_SQLOPTIMIZER increases since the execution of the query up to the point of OUTOF MEMORY, but the Average value is 54.7 MB during that period as can be seen on attached graph.
We have encountered this issue already two times (every time the critical query is executed).

Hi,
This does seems to me kind of memory Leak and actually it is from SQL Optimizer which leaked memory from buffer pool so much that it did not had any memory to be allocated for new page.
MEMORYCLERK_SQLOPTIMIZER (node 1)                KB
VM Reserved                                       0
VM Committed                                      0
Locked Pages Allocated                            0
SM Reserved                                       0
SM Committed                                      0
SinglePage Allocator                       19419712
MultiPage Allocator                             128
Can you post complete DBCC MEMORYSTATUS output which was generated in errorlog. Is this the only message in errorlog or there are some more messages before and after it.
select (SUM(single_pages_kb)*1024)/8192 as total_stolen_pages, type
from sys.dm_os_memory_clerks
group by typeorder by total_stolen_pages desc
and
select sum(pages_allocated_count * page_size_in_bytes)/1024,type from sys.dm_os_memory_objects
group by type
If you can post the output of above two queries with dbcc memorystaus output on some shared drive and share location with us here. I would try to find out what is leaking memory.
You can very well apply SQL Server 2008 r2 SP3 and see if this issue subsides but I am not sure whether this is fixed or actually it is a bug.
Please mark this reply as answer if it solved your issue or vote as helpful if it helped so that other forum members can benefit from it
My Technet Wiki Article
MVP

How to maintain Proportional Factors in SNP (not in DP)

Hi Gurus!
I want to maintain proportional Factors in SNP but could not know how to do. I read saphelp and know that we have to set up as following Steps:
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         1.Set the Keyfigure calculation type For Key Figure KF1 to P or I
         2.Set disaggregation key figure for KF1 to u201CAPODPDANTu201D
-When creating Planning Book/Dataview:
        3.Check u201CManual Proportion Maintenaceu201D
         4.Create a new Dataview that contain only KF APODPDANT
But I find that we can do step 3 only when we create Planning book with Planning Area that based on Planning Object Structure of Demand Planning Only (like 9ADPBAS).
With the Planning Area that based on Planning Object structure of SNP (like 9ASNPBAS), when creating planning book I could not check u201CManual Proportion Maintenanceu201D although I did the set up steps 1 and 2.
The question are:
                 1.     Can we maintain Proportional Factors in SNP? If yes, How to do?
                 2.     Can we create a new KF and consider it as Proportional Factor (as KF APODPDANT)? Is there any propblem?
Thanks very much for your help.

Hi Mr. M Manimaran
This is my reason:
We have:
- one DC
- and some locations those receive money from that DC.
The storage capacity of each Location is different from others and has different limit. Each location also need a number of money that is differrent from other.
There is one thing to take notice here: Money is a special good. Letu2019s say location L1 needs 1 million usd, DC can give them in some ways. For example:
-     First choice: 100usd: 90 %; 10usd: 10% ( so percentage of each denomination here is proportional factor)
-     Second choice: 100usd: 10%; 10usd: 90%
So quantity of notes of money of first choice is less than the second one although the total value of two choices are the same. So the Location L1 can store money with first choice. With the second choice, it could not store.
Here, we want to calculate and store Proportional Factor in SNP so that we can run SNP Optimizer or Heuristic inorder to enable the DC to supply money to satisfy the requirement of Location regarding locationu2019s storage capacity.
Please so me the way!
Thanks very much!
Edited by: xuanduyen on Aug 12, 2011 9:41 AM

What are the Optimization Techniques?

What are the Optimization Techniques? Can any one send the one sample program which is having Good Optimization Techniques.
Phani

Hi phani kumarDurusoju ,
ABAP/4 programs can take a very long time to execute, and can make other processes have to wait before executing. Here are
some tips to speed up your programs and reduce the load your programs put on the system:
Use the GET RUN TIME command to help evaluate performance. It's hard to know whether that optimization technique REALLY helps
unless you test it out. Using this tool can help you know what is effective, under what kinds of conditions. The GET RUN TIME
has problems under multiple CPUs, so you should use it to test small pieces of your program, rather than the whole program.
Generally, try to reduce I/O first, then memory, then CPU activity. I/O operations that read/write to hard disk are always the
most expensive operations. Memory, if not controlled, may have to be written to swap space on the hard disk, which therefore
increases your I/O read/writes to disk. CPU activity can be reduced by careful program design, and by using commands such as
SUM (SQL) and COLLECT (ABAP/4).
Avoid 'SELECT *', especially in tables that have a lot of fields. Use SELECT A B C INTO instead, so that fields are only read
if they are used. This can make a very big difference.
Field-groups can be useful for multi-level sorting and displaying. However, they write their data to the system's paging
space, rather than to memory (internal tables use memory). For this reason, field-groups are only appropriate for processing
large lists (e.g. over 50,000 records). If you have large lists, you should work with the systems administrator to decide the
maximum amount of RAM your program should use, and from that, calculate how much space your lists will use. Then you can
decide whether to write the data to memory or swap space. See the Fieldgroups ABAP example.
Use as many table keys as possible in the WHERE part of your select statements.
Whenever possible, design the program to access a relatively constant number of records (for instance, if you only access the
transactions for one month, then there probably will be a reasonable range, like 1200-1800, for the number of transactions
inputted within that month). Then use a SELECT A B C INTO TABLE ITAB statement.
Get a good idea of how many records you will be accessing. Log into your productive system, and use SE80 -> Dictionary Objects
(press Edit), enter the table name you want to see, and press Display. Go To Utilities -> Table Contents to query the table
contents and see the number of records. This is extremely useful in optimizing a program's memory allocation.
Try to make the user interface such that the program gradually unfolds more information to the user, rather than giving a huge
list of information all at once to the user.
Declare your internal tables using OCCURS NUM_RECS, where NUM_RECS is the number of records you expect to be accessing. If the
number of records exceeds NUM_RECS, the data will be kept in swap space (not memory).
Use SELECT A B C INTO TABLE ITAB whenever possible. This will read all of the records into the itab in one operation, rather
than repeated operations that result from a SELECT A B C INTO ITAB... ENDSELECT statement. Make sure that ITAB is declared
with OCCURS NUM_RECS, where NUM_RECS is the number of records you expect to access.
If the number of records you are reading is constantly growing, you may be able to break it into chunks of relatively constant
size. For instance, if you have to read all records from 1991 to present, you can break it into quarters, and read all records
one quarter at a time. This will reduce I/O operations. Test extensively with GET RUN TIME when using this method.
Know how to use the 'collect' command. It can be very efficient.
Use the SELECT SINGLE command whenever possible.
Many tables contain totals fields (such as monthly expense totals). Use these avoid wasting resources by calculating a total
that has already been calculated and stored.
These r good websites which wil help u :
Performance tuning
http://www.sapbrainsonline.com/ARTICLES/TECHNICAL/optimization/optimization.html
http://www.geocities.com/SiliconValley/Grid/4858/sap/ABAPCode/Optimize.htm
http://www.abapmaster.com/cgi-bin/SAP-ABAP-performance-tuning.cgi
http://abapcode.blogspot.com/2007/05/abap-performance-factor.html
cheers!
gyanaraj
****Pls reward points if u find this helpful

LR4.3 w/ NIK filters - Image previews keep reloading Constantly until Catalog Optimization

Just bought the NIK filters on Googles big sale - problem is everytime I add a NIK filter - so far only tried Color Efex Pro - via the External Editor in LR4.3, Save, and then go back into LR4.3 the Image Preview keeps reloading while I try to make further adjustments on the image. Impossible to work with as when I use Adjust brush the image disappears for a second as I move the brush around to add my mask.
Interestingly, if I Exit LR4 and relaunch the catalog that same photo with the NIK filter has no problem anymore. The catalog is set to "optimize" everytime I close LR. So why when NIK filters are added can the catalog not work well with them until the optimization process? Do I have a setting wrong in preferences that effects this?
I called NIK (Google) twice. They are useless. A so-called LR NIK expert named "Jessica" is not the expert she presents. She only knows how to have you re-install the software LOL. Then transfers you to oblivion of Google MUSAK. I don't think that NIK LR experts exist there or they are Product Managers who are not on support. Hoping some LR guru might know what is happening with my previews when those filters are applied.
Win 7 64 bit environment 16 GB RAM (but same thing happens on my Mac Laptop)

Thanks Rob. I opened a different LR4 catalog on the PC that only has two photos in it and the problem didnotoccur. So it does seem to be an issue with catalogs that have a lot of raw Canon 5D Mark III images. The image "flickering/reloading" also occurs on the Mac Laptop running a different catalog but that one also has a ton of canon raw images. The PC catalog (the one with the problem) also resides on an EHD so I'm not sure if that is a factor, or not - the other one with only 2 photos total is on my hard drive.
I guess I could try to move the entire catalog to my HD (and raw images) and test again. If still a problem then it is either the size of the catalog or some setting in that catalog. Does NIK SW have a max size threshold recommended? I realize it converts the raw to an RGB format when it opens the image - the last image started as 25MB raw and ended up at 160MB after I added a few of your filters stacked and then did some touch ups in LR. Do your recommend any compression? I can set that as a preference for Color Efex in the External Editor settings?
Joan Sides
Email links removed by moderator
Message was edited by: Geoff the kiwi as placing email addresses on an open public forum is an invitation to hackers and spammers.

Optimize JPG image size reduction by reduced compression quality vs. reduced pixels?

I have many images of slides scanned at high res (4800 DPI, maximum pixels 5214x3592). Although I will be saving these as lossless TIFs, I also wish to make JPGs from them that I wish to be just less than 5 MB in file size. Aside from cropping, I know I can achieve such a reduction of JPG file size by a combination of saving to lower quality JPG compression or reducing image size. My question is, what is theoretically or practically better, achieving this mostly by reducing image total pixels or by reducing JPG compression quality. Thank you

Thank you Doug. The comments on extensive uniform blue sky vs. marked variation in color seem well taken, I'll keep this method of choosing in mind. My goal is to create a JPG family photo archive of the highest quality images that I can make for future use by non-technical descendants (thus it will supplement the TIF archive that holds the best quality versions of the same images but that may not be usable to novices). As I cannot anticipate exactly how the JPGs will be used, I just want them to be the best possible, while still being of a size that can be uploaded to, say, Costco (5 MB size limit) for making enlargements.
In general, I am often left curious as to how exactly Photoshop carries out its algorithms and how different factors influence the outcome. So often, one read "just try different techniques and see what looks the best". But I am always left wondering, what is the theory behind this and has it been systematically studied and worked out and published. In so many disciplines, such as medicine, the methods of optimization has been evaluated, systematized, and fully described. I have not yet explored what may be found in technical journals, but I'm sure much of this good stuff must be available somewhere. It would be nice to have a "How Things Work" that actually explains what Photoshop is doing under the hood.
Thanks again.

Optimizer factors

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