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  • Catching Up with Lisp

    Support for multicore and Big Data are among the upcoming features of Franz's Lisp-based tools Lisp - Programming - Languages - FAQs Help and Tutorials - Compilers and Interpreters

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  • SEO + international sites? country.domain.com or domain.country?

    - by Pure.Krome
    Hi folks, is it better to have seperate country specific domains (which costs more money) or subdomains which define the country, for better SEO? eg. stackoverflow.com stackoverflow.com.au stackoverflow.co.uk vs stackoverflow.com au.stackoverflow.com uk.stackoverflow.com Assumption: int the search engine web master tools, each subdomain are associated to a country. eg. au.stackoverflow.com is associated to the country Australia. cheers! Update I understand that both methods do work, especially when i utilize the assumption, listed above. The question is about: Which method is better? Is there such a small SEO difference between them? Is the first method way way way better than the second with getting better SEO results? Update #2 A number of folks have suggested that the following is a good/better approach: stackoverflow.com/ stackoverflow.com/au stackoverflow.com/uk By adding a country specific iso code to the end of the url/the first folder of the domain can be recognised as the country. But a number of SEO mates have suggested that this is a valuable waste of folder level space. Er.. how can i explain. Ok, it's been suggested by some SEO experts that if the number of levels or folders in the domain exceeds 5 then the page drops dramatically in importance. Basically, you don't want to make it deep. As such, adding the country as the first level can be considered a waste, especially when it can be handled by the domain OR subdomain - hence the question :) So, any more thoughts on this? (Maybe SO is the wrong place to ask this question?)

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  • Direct IO enhancements in OVM Server for SPARC 2.2(a.k.a LDoms2.2)

    - by user12611315
    The Direct I/O feature has been available for LDoms customers since LDoms2.0. Apart from the latest SR-IOV feature in LDoms2.2, it is worth noting a few enhancements to the Direct I/O feature. These are: Support for Metis-Q and Metis-E cards. These cards are highly requested for support and are worth mentioning because they are the only combo cards containing both FibreChannel and Ethernet in the same card. With this support, a customer can have both SAN storage and network access with just one card and one PCIe slot assigned to a logical domain. This reduces cost and helps when there are less number of slots in a given platform. The following are the part numbers for these cards. I have tried to put the platforms on which each card is supported, but this information can get quickly outdated. The accurate information can be found at the Support Document.  Card Name  Part Number  Platforms Metis-Q: StorageTek Dual 8Gb Fibre Channel Dual GbE ExpressModule HBA, QLogic SG-XPCIEFCGBE-Q8-N  SPARC T3-4, T4-4 Metis-E: StorageTek Dual 8Gb Fibre Chanel Dual GbE ExpressModule HBA, Emulex SG-XPCIEFCGBE-E8-N SPARC T3-4, T4-4  Additional cards added to the portfolio of supported cards. This is mainly Powerville based Ethernet cards, the part numbers for these cards as below:  Part Number  Description  7100477 Sun Quad Port GbE PCI Express 2.0 Low Profile Adapter, UTP  7100481 Sun Dual Port GbE PCI Express 2.0 Low Profile Adapter, MMF  7100483 Sun Quad Port GbE PCI Express 2.0 ExpressModule, UTP  7110486 Sun Quad Port GbE PCI Express 2.0 ExpressModule, MMF    Note:  Direct IO feature has a hard dependency on the Root domain(PCIe bus owner, here Primary domain). That is, rebooting the Root domain for any reason may impact the logical domains having PCIe slots assigned with Direct IO feature. So rebooting a root domain need to be carefully managed. Also apply the failure-policy settings as described in the admin guide and release notes to deal with unexpected cases.

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  • Interpreting Munin graphs showing available entropy and MySQL slow queries in sync

    - by user64204
    We're experiencing performance issues on our website, and after reviewing our munin graphs, the only metrics we've found in sync are Available entropy and MySQL slow queries, with the latter influenced by our number of logged in users: Based on the wikipedia entropy page, my understanding is that entropy is the amount of randomness (here measured in bytes) that the system can use for various tasks, mainly cryptography and functions that require random input. Since the peaks in available entropy and MySQL slow queries are occurring in sync and at regular interval, that the number of MySQL slow queries is proportional to our number of Drupal users whereas the peaks in available entropy seem to be much more constant and less proportional to these 2 metrics, we're thinking available entropy is the reflect of a root cause which, combined with the traffic to our website, is causing those slow queries (and not the opposite, slow queries influencing the entropy). Accordingly: Q: What underlying problem do you think could cause regular peaks in available entropy that could have an influence on MySQL's ability to process queries?

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  • Gathering statistics for an Oracle WebCenter Content Database

    - by Nicolas Montoya
    Have you ever heard: "My Oracle WebCenter Content instance is running slow. I checked the memory and CPU usage of the application server and it has plenty of resources. What could be going wrong?An Oracle WebCenter Content instance runs on an application server and relies on a database server on the back end. If your application server tier is running fine, chances are that your database server tier may host the root of the problem. While many things could cause performance problems, on active Enterprise Content Management systems, keeping database statistics updated is extremely important.The Oracle Database have a set of built-in optimizer utilities that can help make database queries more efficient. It is strongly recommended to update or re-create the statistics about the physical characteristics of a table and the associated indexes in order to maximize the efficiency of optimizers. These physical characteristics include: Number of records Number of pages Average record length The frequency with which you need to update statistics depends on how quickly the data is changing. Typically, statistics should be updated when the number of new items since the last update is greater than ten percent of the number of items when the statistics were last updated. If a large amount of documents are being added or removed from the system, the a post step should be added to gather statistics upon completion of this massive data change. In some cases, you may need to collect statistics in the middle of the data processing to expedite its execution. These proceses include but are not limited to: data migration, bootstrapping of a new system, records management disposition processing (typically at the end of the calendar year), etc. A DOCUMENTS table with a ten million rows will often generate a very different plan than a table with just a thousand.A quick check of the statistics for the WebCenter Content (WCC) Database could be performed via the below query:SELECT OWNER, TABLE_NAME, NUM_ROWS, BLOCKS, AVG_ROW_LEN,TO_CHAR(LAST_ANALYZED, 'MM/DD/YYYY HH24:MI:SS')FROM DBA_TABLESWHERE TABLE_NAME='DOCUMENTS';OWNER                          TABLE_NAME                       NUM_ROWS------------------------------ ------------------------------ ----------    BLOCKS AVG_ROW_LEN TO_CHAR(LAST_ANALYZ---------- ----------- -------------------ATEAM_OCS                      DOCUMENTS                            4172        46          61 04/06/2012 11:17:51This output will return not only the date when the WCC table DOCUMENTS was last analyzed, but also it will return the <DATABASE SCHEMA OWNER> for this table in the form of <PREFIX>_OCS.This database username could later on be used to check on other objects owned by the WCC <DATABASE SCHEMA OWNER> as shown below:SELECT OWNER, TABLE_NAME, NUM_ROWS, BLOCKS, AVG_ROW_LEN,TO_CHAR(LAST_ANALYZED, 'MM/DD/YYYY HH24:MI:SS')FROM DBA_TABLESWHERE OWNER='ATEAM_OCS'ORDER BY NUM_ROWS ASC;...OWNER                          TABLE_NAME                       NUM_ROWS------------------------------ ------------------------------ ----------    BLOCKS AVG_ROW_LEN TO_CHAR(LAST_ANALYZ---------- ----------- -------------------ATEAM_OCS                      REVISIONS                            2051        46         141 04/09/2012 22:00:22ATEAM_OCS                      DOCUMENTS                            4172        46          61 04/06/2012 11:17:51ATEAM_OCS                      ARCHIVEHISTORY                       4908       244         218 04/06/2012 11:17:49OWNER                          TABLE_NAME                       NUM_ROWS------------------------------ ------------------------------ ----------    BLOCKS AVG_ROW_LEN TO_CHAR(LAST_ANALYZ---------- ----------- -------------------ATEAM_OCS                      DOCUMENTHISTORY                      5865       110          72 04/06/2012 11:17:50ATEAM_OCS                      SCHEDULEDJOBSHISTORY                10131       244         131 04/06/2012 11:17:54ATEAM_OCS                      SCTACCESSLOG                        10204       496         268 04/06/2012 11:17:54...The Oracle Database allows to collect statistics of many different kinds as an aid to improving performance. The DBMS_STATS package is concerned with optimizer statistics only. The database sets automatic statistics collection of this kind on by default, DBMS_STATS package is intended for only specialized cases.The following subprograms gather certain classes of optimizer statistics:GATHER_DATABASE_STATS Procedures GATHER_DICTIONARY_STATS Procedure GATHER_FIXED_OBJECTS_STATS Procedure GATHER_INDEX_STATS Procedure GATHER_SCHEMA_STATS Procedures GATHER_SYSTEM_STATS Procedure GATHER_TABLE_STATS ProcedureThe DBMS_STATS.GATHER_SCHEMA_STATS PL/SQL Procedure gathers statistics for all objects in a schema.DBMS_STATS.GATHER_SCHEMA_STATS (    ownname          VARCHAR2,    estimate_percent NUMBER   DEFAULT to_estimate_percent_type                                                 (get_param('ESTIMATE_PERCENT')),    block_sample     BOOLEAN  DEFAULT FALSE,    method_opt       VARCHAR2 DEFAULT get_param('METHOD_OPT'),   degree           NUMBER   DEFAULT to_degree_type(get_param('DEGREE')),    granularity      VARCHAR2 DEFAULT GET_PARAM('GRANULARITY'),    cascade          BOOLEAN  DEFAULT to_cascade_type(get_param('CASCADE')),    stattab          VARCHAR2 DEFAULT NULL,    statid           VARCHAR2 DEFAULT NULL,    options          VARCHAR2 DEFAULT 'GATHER',    objlist          OUT      ObjectTab,   statown          VARCHAR2 DEFAULT NULL,    no_invalidate    BOOLEAN  DEFAULT to_no_invalidate_type (                                     get_param('NO_INVALIDATE')),  force             BOOLEAN DEFAULT FALSE);There are several values for the OPTIONS parameter that we need to know about: GATHER reanalyzes the whole schema     GATHER EMPTY only analyzes tables that have no existing statistics GATHER STALE only reanalyzes tables with more than 10 percent modifications (inserts, updates,   deletes) GATHER AUTO will reanalyze objects that currently have no statistics and objects with stale statistics. Using GATHER AUTO is like combining GATHER STALE and GATHER EMPTY. Example:exec dbms_stats.gather_schema_stats( -   ownname          => '<PREFIX>_OCS', -   options          => 'GATHER AUTO' -);

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  • Spectacular Explosion On Sun [Video]

    - by Gopinath
    Yesterday seems to be it’s too hot inside the crust of Sun and it resulted in an big explosion!! An explosion that was spectacular to watch and the event was something like never seen before : a solar flare, a coronal wave, a filament eruption, a coronal mass ejection, coronal rain and a coronal mass ejection to name a few. Check the embedded video Did you notice the hole on the Sun when it exploded? It’s a really very big one and can accommodate many Earth’s into that (check this for size comparison) Image and story via Geeked On Goddard This article titled,Spectacular Explosion On Sun [Video], was originally published at Tech Dreams. Grab our rss feed or fan us on Facebook to get updates from us.

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  • Find the latest file by modified date

    - by Rich
    If I want to find the latest file (mtime) in a (big) directory containing subdirectories, how would I do it? Lots of posts I've found suggest some variation of ls -lt | head (amusingly, many suggest ls -ltr | tail which is the same but less efficient) which is fine unless you have subdirectories (I do). Then again, you could find . -type f -exec ls -lt \{\} \+ | head which will definitely do the trick for as many files as can be specified by one command, i.e. if you have a big directory, -exec...\+ will issue separate commands; therefore each group will be sorted by ls within itself but not over the total set; the head will therefore pick up the lastest entry of the first batch. Any answers?

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  • Need help with this question [closed]

    - by Jaime
    Occasionally, multiplying the sizes of nested loops can give an overestimate for the Big-Oh running time. This result happens when an innermost loop is infrequently executed. Give the Big-O analysis of the running time. Implement the following code and run for several values of N, and compare your analysis with the actual running times. for(int i = 1; i <= n; i++) for(int j = 1; j<=i * i; j++) if(j%i == 0) for(int k = 0; k < j; k++) sum++;

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  • Drawing lots of tiles with OpenGL, the modern way

    - by Nic
    I'm working on a small tile/sprite-based PC game with a team of people, and we're running into performance issues. The last time I used OpenGL was around 2004, so I've been teaching myself how to use the core profile, and I'm finding myself a little confused. I need to draw in the neighborhood of 250-750 48x48 tiles to the screen every frame, as well as maybe around 50 sprites. The tiles only change when a new level is loaded, and the sprites are changing all the time. Some of the tiles are made up of four 24x24 pieces, and most (but not all) of the sprites are the same size as the tiles. A lot of the tiles and sprites use alpha blending. Right now I'm doing all of this in immediate mode, which I know is a bad idea. All the same, when one of our team members tries to run it, he gets very bad frame rates (~20-30 fps), and it's much worse when there are more tiles, especially when a lot of those tiles are the kind that are cut into pieces. This all makes me think that the problem is the number of draw calls being made. I've thought of a few possible solutions to this, but I wanted to run them by some people who know what they're talking about so I don't waste my time on something stupid: TILES: When a level is loaded, draw all the tiles once into a frame buffer attached to a big honking texture, and just draw a big rectangle with that texture on it every frame. Put all the tiles into a static vertex buffer when the level is loaded, and draw them that way. I don't know if there's a way to draw objects with different textures with a single call to glDrawElements, or if this is even something I'd want to do. Maybe just put all the tiles into a big giant texture and use funny texture coordinates in the VBO? SPRITES: Draw each sprite with a separate call to glDrawElements. Use a dynamic VBO somehow. Same texture question as number 2 above. Point sprites? This is probably silly. Are any of these ideas sensible? Is there a good implementation somewhere I could look over?

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  • Changing Word mail merge data source locations in bulk?

    - by Daft Viking
    I've just moved a number of Word mail merge files, and a number of Excel spreadsheets that are the data sources for the mail merges, from a Windows XP computer to a Windows 7 computer, and now all the paths for the merge sources are incorrect (used to be c:\documents and settings\user\my documents.... now c:\users\documents....). While I can correct the path of the data source in each file individually, I was hoping that there would be some way of updating the files in bulk, as there are a relatively large number of them. Word 2007 is what is being used, but the documents are all in the previous DOC format (not DOCX).

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  • Drive Innovation from Data with Oracle Business Analytics

    - by Mike.Hallett(at)Oracle-BI&EPM
    Oracle is doing a big marketing push on the transformational value of Business Analytics to our customers, and we hope you as partners can get excited, involved and more business from this campaign.  Work with your local in-country BI business development manager and your partner channel manager: if you want to contribute and are struggling to make contact, then let me know ([email protected]) and I will facilitate introductions. Oracle Day Business Analytics Track Invite your customers to register for their local Oracle Day to get the latest news from OpenWorld and learn about Oracle's Big Data strategy and solution. There is a dedicated Business Analytics track. Business Analytics Facebook Hub Encourage your customers to "Like" the Business Analytics Facebook Page @ www.facebook.com/OracleBusinessAnalytics so they can receive useful and interesting information on their Facebook wall.

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  • UI Design Patterns : Are you developing a Fusion Apps extension, an ADF or Webcenter App?

    - by asantaga
    A big question I get asked when speaking to partners who are developing Oracle ADF, or Webcenter, Apps is how to make it look nice.. Some of the big SIs ask me, "Do we have any design patterns/guidelines we can use?". .. Alas website design is a very personal thing and each website will have different requirements and needs, however I am now pleased to say we've just launched "Oracle Fusion Applications Design Patterns" website.   The website is the result of many years of Oracle R&D into user interface design for Fusion applications and features a really cool web app which allows you to visualise the UI components in action. Although many of the design patterns are related to ADF , its worth noting that ADF took its lead from Oracle Fusion Applications User Interface needs - not the other way around, its just taken us a while to publish these. Coupled together with the dashboard patterns this makes are really cool extra asset for your kit bag Design Patterns Oracle dashboard patterns and guidelines Usable Apps.oracle.com Enjoy

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  • PHP and performance

    - by Naif
    I always hear that PHP is for medium and small websites whereas .NET and Java for enterprise applications. My question is about PHP. Why is PHP not a good option for enterprise web applications? Is it because if the web application becomes bigger then PHP will be slower as it is an interpreted language? I know that corporate world will choose .NET or J2EE because of the integration with their products and because of back end services, etc. However, if we just have PHP for building sites and web applications then how can we use it to perform well with big sites? In short, Is there a relationship between the performance of PHP and the size of the website? What are the factors that make PHP not appropriate option for big sites?

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  • Which programming career path fits my terms? [closed]

    - by Goward Gerald
    I am sick and tired of my enterprise development job, I need some programming direction like this: Demanded in jobs-market Demanded in freelance market Can use Ubuntu as development environment Not enterprise. Standalone, mobile, web-development, anything, just not enterprise. Basically, I need a programming direction which doesn't need 20 developers, terribly big databases systems and long going projects with intense long-term support, I don't want enterprise job where a lot of people are working on one terribly big project and do modules to it all day long. Instead, I need something where: Projects change pretty often Projects are little, or medium-sized (in terms of code, modules and people working on it) but still not enterprise-sized Possible for freelance, solo-development, or at least requires a team of 3-4 programmers. Not like in enterprise where you feel like a drop in the sea with your 50 classes while system itself has hundreds of classes. Suggestions please?

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  • Limit maximum incoming connections to a port using iptables

    - by Harley
    I have a server that has apache listening on a number of ports. Some ports are used for configuring the server, and another is used to download large files. My problem is that when I have a large number of clients downloading files, the web interface is uncontactable. I would like to limit the number of clients connecting on the "large file" port so that apache always has available connections to configure the server. A REJECT is fine, the client trying to download the file will back off and retry later. Each client only has one connection open to the server at a time, so limiting by IP won't work. I know I could put something in front of apache to manage this, but I'd really like to do it in iptables, without adding more software.

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  • Strange 401 (Unauthorized) when calling a WCF Service

    - by mipsen
    A WCF Service we call from BizTalk using WCF BasicHTTP usually works fine but all of a sudden it started returning 401 errors for some calls while others continued working as expected so it could not have been a "real" 401. The difference was the size of the message. One parameter of the service is a rather complex object. In the cases we got a 401 it got quite big (containing a lot of customer-data), say 5 MB. So we turned on tracking. The messages we traced out where about 20MB. Not too big for WCF one should suppose... A bit of research led us to increasing maxItemsInObjectGraph in the behaviours but that did not help. The service we call is in the same network as we are and is a WCF service. So we tried changing from BasicHTTP to net.tcp and Bingo! Ok, we had to use CustomBinding in BizTalk to set all the Quotas, etc. but it worked in the end.

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  • How do you apply development practices like version control, testing and continuous integration/deployment to system administration?

    - by arex1337
    Imagine you're going to manage a number of servers with a number of different services that's used by a number of people. Now say you want to reconfigure or replace some software on one of those servers. Obviously you don't want to work on servers that are in production. If this was a code change, as a developer, I would make the change on my local development machine, test it locally and commit the change to a version control system. The changes could then be deployed in a staging environment, tested further and finally deployed in a production environment. It would also be easy for me to roll back, if necessary. Generally, or specifically, how do you achieve this in system administration? (The first thing that comes to mind is to use virtual machines and put virtual machine images in version control, but I'm sure there is a lot of literature and clever solutions I'm not presently aware of.)

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  • Hiding a column from a pivot table without removing it from the chart

    - by Simon
    I have a pivot table with two columns: number of users who visited a website (impressions) and number of users who registered on the site (regs). The rows are for dates. I want to visualize the percentage of users who registered after visiting the site. Thus, I have the number of users for each cell as a value field, displaying it as percentage of impressions. Generating a pivot chart from the table, impressions and regs are plotted over date as a percentage of impressions. This means there is one line at 100% for impressions (always 100% of itself) and the graph for registrations below that. I'd like to remove the line for impressions, but when I set a filter to do so, registrations vanish as well, since the column for impressions is filtered from the pivot chart as well, turning the value field invalid. How can I just show registrations as a percentage of impressions in the chart?

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  • Rules to choose hardware for OLTP systems (sql server)

    - by Roman Pokrovskij
    Ok. We know database size, number of concurrent users, number of transactions per minute; should choose number of processors, RAID, RAM, mirroring and clustering. There are no exact rule.. but may be there are no rules at all? In my practice in every case I have "legacy" system, and after some inspections and interview I can form an opinion how hardware and design can be improved. But every time when I meet "absolutely" new system (I guess there are no new systems, but sometimes are such tasks) I can't say anything trustful. So I'm interesting how people deal with such tasks? They map task on theirs experience or have some base formulas?

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  • SSMS Tools Pack 2.5.3 is out with bug fixes and improved licensing

    - by Mladen Prajdic
    Licensing for SSMS Tools Pack 2.5 has been quite a hit and I received some awesome feedback. The version 2.5.3 contains a few bug fixes and desired licensing improvements. Changes include more licensing options, prices in Euros because of book keeping reasons (don't you just love those :)) and generally easier purchase and licensing process for users. Licensing now offers four options: Per machine license. (€25) Perfect if you do all your work from a single machine. Plus one OS reinstall activation. Personal license (€75) Up to 4 machine activations. Plus 2 OS reinstall activations and any number of virtual machine activations. Team license (€240) Up to 10 machine activations. Plus 4 OS reinstall activations and any number of virtual machine activations. Enterprise license (€350+) For more than 10 machine activations any number of virtual machine activations. 30 days license. Time based demo license bound to a machine. You can view all the details on the Licensing page . If you want to receive email notifications when new version of SSMS Tools Pack is out you can do that on the Main page or on the Download page . Version 2.7 is expected in the first half of February and won't support SSMS 2005 and 2005 Express anymore. Enjoy it!

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