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When to use Hadoop, HBase, Hive and Pig?
...ru some SQL like language
To replace daily aggregation data generated thru MySQL with Hive
Build Custom reports thru queries in Hive
Architecture Options
I benchmarked the following options:
Hive+HDFS
Hive+HBase - queries were too slow so I dumped this option
Design
Daily log Files were tr...
What is the best place for storing uploaded images, SQL database or disk file system? [closed]
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I have recently created a PHP/MySQL app which stores PDFs/Word files in a MySQL table (as big as 40MB per file so far).
Pros:
Uploaded files are replicated to backup server along with everything else, no separate backup strategy is needed (peace of min...
PHP: How to remove all non printable characters in a string?
...r all of the cases. My issue was in trying to insert a string into a utf8 mysql table. The string (and its bytes) all conformed to utf8, but had several bad sequences. I assume that most of them were control or formatting.
function clean_string($string) {
$s = trim($string);
$s = iconv("UTF-...
select * vs select column
...the top of my head is when you want only the value of an indexed column in MySQL (for example, just to check for row existence), and you're using MyISAM storage engine, it'll grab the data from the MYI file, which could be in memory, and not even go to disk!
– Mike Sherov
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Convert a PHP script into a stand-alone windows executable
...it to "www/" directory. Using SQLite database is optional, you could embed mysql/postgresql database in application's installer.
PHP Nightrain
https://github.com/kjellberg/nightrain
Using PHP Nightrain you will be able to deploy and run HTML, CSS, JavaScript and PHP web applications as a native d...
What's the difference between NOT EXISTS vs. NOT IN vs. LEFT JOIN WHERE IS NULL?
...LEFT JOIN / IS NULL: Oracle
NOT IN vs. NOT EXISTS vs. LEFT JOIN / IS NULL: MySQL
In a nutshell:
NOT IN is a little bit different: it never matches if there is but a single NULL in the list.
In MySQL, NOT EXISTS is a little bit less efficient
In SQL Server, LEFT JOIN / IS NULL is less efficient
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First-time database design: am I overengineering? [closed]
...noting that if you're generating CSVs already and want to load them into a mySQL database, LOAD DATA LOCAL INFILE is your best friend: http://dev.mysql.com/doc/refman/5.1/en/load-data.html . Mysqlimport is also worth looking into, and is a command-line tool that's basically a nice wrapper around loa...
淘宝网采用什么技术架构来实现网站高负载的 - 更多技术 - 清泛网 - 专注C/C...
...，淘宝目前也正在从昂贵的高端存储(小型机+ORACLE)切换到MYSQL,切 换到MYSQL以 后，势必会遇到垂直分区(分库)以及水平分区(Sharding)的问题，因此目前淘宝根据自 己的业务特点也开发了自己的TDDL框架，此框架主要解决了分库分表对...
Difference between HBase and Hadoop/HDFS
...d when you have real-time needs.
An analogous comparison would be between MySQL and Ext4.
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How to work around the lack of transactions in MongoDB?
...chnology applied to Mongodb try github.com/Tokutek/mongo , if you need the mysql version maybe they added it to their standard version of Mysql that they usually provide with
– Giovanni Bitliner
Dec 8 '15 at 8:57
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