Simple Locking Protocol | Concurrency Control

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Комментарии
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UPSS!!! 3.00 is wrong! the phrase: "another transaction can apply exclusive lock" is not true! Correction: Only shared lock (read) request could be applied when a shared lock has already obtained.

jkj
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If a transaction has share lock, you CAN'T apply exclusuve lock! FIRST EXAMPLE (with x in circle) IS WRONG!

icscybersecure
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Love your videos, you're saving my life.

maxvandoorn
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Lol all these people correcting his first example without finishing the video. He corrected himself later my dudes.

KCIsMe
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In Transaction T1, we need to acces A first. So shouldn't you have apply shared lock on A to read it first and then Lock-x to write it ?

shashankkumar
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how someone can write a locked item x shared lock in t1 how t2 is accesing it writing it need to first unlock or release the item x incompatible.

gadgetarena.premium
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can you show you how to lock a table(or)database in mysql

manisai
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*If Reading data item does not need locking* then why do we have shared lock ??

ahtisham
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Can someone explain me why there is a need for locks???
I am not able to understand... :(...

lonewolf
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That means shared exclusive locks have no advantages

twinklegarg