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I was wondering how MySQL (and other databases for that matter) work under the hood. Do they use standard C I/O calls like fseek to find a record?
Here is the link to the source code. From a quick review of the file I can confirm that there are multiple check that is been done before and after an insert. It's actually a great idea to review the whole file very interesting.
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can one get back a data that has been deleted from a database? if it is possible how can it be done?
Oracle
If you have not COMMITted the DELETE then you can use ROLLBACK.
If you have COMMITted the DELETE and you have FLASHBACK turned on then you can restore it to a previous point before the DELETE.
If neither of those work then you will be relying on backups.
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Is there a way to scan a folder to find a string in HTML, CSS, PHP, etc?
Short answer: yes, you may easily do so if you're on Linux. You can use the commandline utility "grep". Here's a tutorial you may find helpful.
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I wonder is there any way to decrypt passwords in sql database in an clear plain text that which already stored in HASH code?? if so can anyone explain me.
Thank you.
It depends on the hashing algorithm used, but given that it's hashed at all, then a one way function has almost certainly been used, which means you can't decrypt it easily.
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I want to use Redis in Magento instead of mysql? I do like how to done it?
Good day.
Redis is not a replacement MySQL.
If you you want to use NoSQL with Magento, you must choose DB with guarantee the preservation to Storage
For Example - MongoDB
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I need a online website to test MySQL statements (some sort of sandbox). Bonus points if you can store code and share it with other people. Something similar to jsfiddle.net for JavaScript. It allows code testing in a safe secure environment.
Theres an sql formatting tool that also reports syntax errors:
http://www.dpriver.com/pp/sqlformat.htm