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Navneet Kumar

Javascript - Introduction to Events - 0 views

www.quirksmode.org/...introevents.html

book event_handling javascript

shared by Navneet Kumar on 12 Mar 07 - Cached
  • Navneet Kumar on 12 Mar 07
     
    event handling in javascript
Navneet Kumar

The Spring Framework - Reference Documentation - 0 views

www.springframework.org/...index.html

documentation framework j2ee java reference spring

shared by Navneet Kumar on 12 Mar 07 - Cached
  • Navneet Kumar on 12 Mar 07
     
    The Spring Framework - Reference Documentation
Navneet Kumar

MySQL Performance Blog » What to tune in MySQL Server after installation - 0 views

www.mysqlperformanceblog.com/...ysql-server-after-installation

mysql optimization performance tuning

shared by Navneet Kumar on 25 Sep 07 - Cached
  • Navneet Kumar on 25 Sep 07
     
    tuning mysql server for perfornmance
Navneet Kumar

MySQL Reference Manual for version 5.0.3-alpha - 23 Error Handling in MySQL - 0 views

www.browardphp.com/...manual_Error-handling.html

error_codes mysql

shared by Navneet Kumar on 27 Aug 07 - Cached
  • Navneet Kumar on 27 Aug 07
     
    mysql error codes
Navneet Kumar

SQL Server 7.0: Resolving System Error Messages - 0 views

www.microsoft.com/...75528c13.mspx

database debugging mssql sql

shared by Navneet Kumar on 27 Aug 07 - Cached
  • Navneet Kumar on 27 Aug 07
     
    some ms-sql error-code  descriptions
Thiyagarajan Sadasivam

Essential Vim - 0 views

www.pixelbeat.org/vim.tips.html

vim editors shortcuts tips

shared by Thiyagarajan Sadasivam on 30 Jun 10 - Cached
  • Thiyagarajan Sadasivam on 30 Jun 10
     
    Essential keyboard shortcuts and commands for VIM
Navneet Kumar

JavaScript tutorial - 0 views

www.howtocreate.co.uk/...combinedpage

javascript tutorial

shared by Navneet Kumar on 28 Nov 07 - Cached
  • for your own objects, you may wish to provide a special string that may provide more useful information. To do this, simply define the 'toString' method:
  • not have to store individual copies of the methods for each instance of the object, so it may require less memory, but it will require the browser to search the current and parent scopes to find the methods. This may cause a marginal delay
  • Saying 'this.propertyname' as I did above will create a public property. Any script can create an object then use and modify its properties directly. Using 'var' to define a variable in the constructor will create a private property.
  • ...7 more annotations...
  • Private variables can only be accessed from methods that are declared inline, and not externally referenced or created using the prototype construct. Methods of this kind are also known as privileged methods
  • prototype chain.
  • That also means that if the mycircle prototype is changed (properties are added or deleted, etc.), these changes are replicated down the chain, so the mysphere also inherits these changes.
  • mysphere.prototype.constructor = mysphere;
  • I will take all of the methods out of the constructor, and add them later using the prototype. That way, the mycircle prototype methods will always be available without me needing to create a new mycircle. Unfortunately, this also means that public and private properties are very hard (or impossible) to use. It's a trade off - one functionality for another.
  • When running the method, we need to tell JavaScript that even though we are referencing a method for a different prototype, we want to run it as if it were a method of the object we are creating (to make sure that any properties it creates are added to the object we are creating). This could be done using the 'call' method or 'apply' method
  • Note that when assigning the mycircle object to the mysphere prototype, it also overwrites the mysphere prototype constructor property
  • Navneet Kumar on 28 Nov 07
     
    complete Javascript tutorial
Navneet Kumar

MySQL Performance Blog » MySQL Query Cache - 0 views

www.mysqlperformanceblog.com/...mysql-query-cache

caching mysql performance tuning

shared by Navneet Kumar on 26 Sep 07 - Cached
  • It does not cache the plan but full result sets
  • so it looks at first letter of the query and if it is “S” it proceeds with query lookup in cache if not - skips it.
  • Might not work with transactions
  • ...15 more annotations...
  • uses non-deterministic functions such as UUID(), RAND(), CONNECTION_ID() etc it will not be cached.
  • If table gets modification all queries derived from this table are invalidated at once
  • if you have high write application such as forums, query cache efficiency might be pretty low due to this.
  • all queries are removed from cache on table modifications - if there are a lot of queries being cached this might reduce update speed a bit
  • Qcache_free_memory and Qcache_lowmem_prunes
  • number of your selects - Com_select and see how many of them are cached. Query Cache efficiency would be Qcache_hits/(Com_select+Qcache_hits).
  • One portion of query cache overhead is of course inserts so you can see how much of inserted queries are used: Qcache_hits/Qcache_inserts Other portion of overhead comes from modification statements which you can calculate by (Com_insert+Com_delete+Com_update+Com_replace)/Qcache_hits
  • want to set query cache
  • means it is much more efficient as query which required processing millions of rows now can be instantly summoned from query cache
  • It also means query has to be exactly the same and deterministic, so hit rate would generally be less
  • full page caching
  • not using query_cache_wlock_invalidate=ON locking table for write would not invalidate query cache so you can get results evenif table is locked and is being prepared to be updated
  • it can serve responses very fast doing no extra conversion or processing.
  • but it is still not as fast as specially designed systems such as memcached or local shared memory.
  • It is not distributed If you have 10 slaves and use query cache on all of them cache content will likely be the same, so you have multiple copies of the same data in cache effectively wasting memory
  • Navneet Kumar on 26 Sep 07
     
    mysql query caching
Navneet Kumar

mysql query cache - 0 views

jayant7k.blogspot.com/...mysql-query-cache.html

mysql performance tuning

shared by Navneet Kumar on 26 Sep 07 - Cached
  • Navneet Kumar on 26 Sep 07
     
    tuning mysql performance with query caching
Navneet Kumar

Pythian Group Blog » MySQL: Tuning filesorts and temporary tables - 0 views

www.pythian.com/...filesorts-and-temporary-tables

mysql tuning

shared by Navneet Kumar on 20 Sep 07 - Cached
  • Navneet Kumar on 20 Sep 07
     
    filesort and temporary tables in query
Navneet Kumar

SQL Server Data Structure - 0 views

www.akadia.com/...sqlsrv_data_structure.html

data_structure ms-sql sql_server storage

shared by Navneet Kumar on 17 Sep 07 - Cached
  • Navneet Kumar on 17 Sep 07
     
    MS SQL Server Data structures. how data is stored in ms sql  server
Navneet Kumar

Vi for programmers - Program - UNIX - Builder AU - 0 views

www.builderau.com.au/...0,339024638,339129821,00.htm

editors tools unix vim

shared by Navneet Kumar on 10 Sep 07 - Cached
  • Navneet Kumar on 10 Sep 07
     
    taming vim, vim options
Navneet Kumar

MySQL AB :: MySQL 5.0 Reference Manual :: 13 Storage Engines - 0 views

dev.mysql.com/...storage-engines.html

database_engine innodb myisam mysql storage

shared by Navneet Kumar on 03 Sep 07 - Cached
  • Navneet Kumar on 03 Sep 07
     
    mysql storage engines myisam and innodb
Navneet Kumar

Generics in C#, Java, and C++ - 1 views

www.artima.com/...genericsP.html

c# c++ generics java

shared by Navneet Kumar on 07 Aug 08 - Cached
  • And really all they're doing in their implementation is automatically inserting those type casts for you. So you get the syntactic sugar, or some of it at least, but you don't get any of the execution efficiency
  • because Java's generics implementation relies on erasure of the type parameter, when you get to runtime, you don't actually have a faithful representation of what you had at compile time. When you apply reflection to a generic List in Java, you can't tell what the List is a List of.
  • C# does the instantiation at runtime.
Navneet Kumar

Unusual software bug - Wikipedia, the free encyclopedia - 0 views

en.wikipedia.org/Heisenbug

debugging testing

shared by Navneet Kumar on 30 Aug 07 - Cached
  • Navneet Kumar on 30 Aug 07
     
    heisenbug, bohrbug, mandelbug, schroedinbug
Navneet Kumar

PatHelland's WebLog : Normalization Is for Sissies - 0 views

blogs.msdn.com/...malization-is-for-sissies.aspx

database database_design denormalization normalization slide

shared by Navneet Kumar on 28 Aug 07 - Cached
  • Navneet Kumar on 28 Aug 07
     
    de-normalization is ok if you are not going to update
Navneet Kumar

When Not to Normalize your SQL Database - SWiK - 0 views

swik.net/...bjdmc

database database_design normalization

shared by Navneet Kumar on 28 Aug 07 - Cached
  • With the above design, it takes six SQL Join operations to access and display the information about a single user. This makes rendering the profile page a fairly database intensive operation which is compounded by the fact that profile pages are the most popular pages on social networking sites.
  • Database denormalization is the kind of performance optimization that should be carried out as a last resort after trying things like creating database indexes, using SQL views and implementing application specific in-memory caching. However if you hit massive scale and are dealing with millions of queries a day across hundreds of millions to billions of records or have decided to go with database partitioning/sharding then you will likely end up resorting to denormalization
    • Navneet Kumar
      Navneet Kumar on 28 Aug 07
       
      De-Normalization is OK if you are'nt going to update
  • Denormalization means that you you are now likely to deal with data inconsistencies because you are storing redundant copies of data and may not be able to update all copies of a column value simultaneously  when it is changed for a variety of reasons. Having tools in your infrastructure to support fixing up data of this sort then become very important.
  • Navneet Kumar on 28 Aug 07
     
    De-normalizing database to improve speed.
Navneet Kumar

What about Sun embracing JavaScript? - 0 views

www.russellbeattie.com/...about-sun-embracing-javascript

blog javascript sun

shared by Navneet Kumar on 27 Aug 07 - Cached
  • There's a lot of work being done by the Mozilla foundation and Adobe to integrate a killer JavaScript interpreter into both Flash and Firefox using Adobe's Tamarin engine
Navneet Kumar

SQL Server 7.0: System Error Messages - 0 views

www.microsoft.com/...75528c12.mspx

database error_codes error_messages ms-sql sql sql_server

shared by Navneet Kumar on 27 Aug 07 - Cached
  • Navneet Kumar on 27 Aug 07
     
    All ms-sql system error messages
Navneet Kumar

perlintro - perldoc.perl.org - 0 views

perldoc.perl.org/perlintro.html

documentation manual perl tutorial

shared by Navneet Kumar on 12 Mar 07 - Cached
  • Navneet Kumar on 12 Mar 07
     
    perl intro tutorial     
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