title: what is the serializability graph of this?
body: <p>I try to figure out a question, however I do not how to solve it, I am unannounced most of the terms in the question. Here is the question: </p>
  
  <blockquote>
    <p>Three transactions; T1, T2 and T3 and schedule program s1 are given
    below. Please draw the precedence or serializability graph of the s1
    and specify the serializability of the schedule S1. If possible, write
    at least one serial schedule. r ==> read, w ==> write</p>
    
    <p>T1: r1(X);r1(Z);w1(X);</p>
    
    <p>T2: r2(Z);r2(Y);w2(Z);w2(Y);</p>
    
    <p>T3: r3(X);r3(Y);w3(Y);</p>
    
    <p>S1: r1(X);r2(Z);r1(Z);r3(Y);r3(Y);w1(X);w3(Y);r2(Y);w2(Z);w2(Y);</p>
  </blockquote>
  
  <p>I do not have any idea about how to solve this question, I need a detailed description. In which resource should I look for? Thank in advance. </p>