Update README.md

README.md

@@ -6,16 +6,14 @@ from MySQL to PostgreSQL as easy and smooth as possible.</p>
 
 <h3>KEY FEATURES</h3>
 <ul>
-<li> Ease of use - the only thing needed to run this app is the Node.js runtime.</li>
 <li> Accuracy of migration the database structure - NMIG converts
    MySQL data types to corresponding PostgreSQL data types, creates constraints,
    indexes, primary and foreign keys exactly as they were before migration.</li>
 
-<li>Ability to migrate big databases - in order to reduce RAM consumption NMIG will split each table's data into several chunks. <br />
-Chunk size can be adjusted easily via configuration file.</li>
+<li>Ability to migrate big databases - in order to eliminate "process out of memory" issues NMIG will split each table's data into several chunks.<br>Each group of chunks will be loaded via separate worker process.</li>
 
 <li> Speed of data transfer - in order to migrate data fast NMIG uses PostgreSQL COPY protocol.</li>
-   
+<li>Ability to recover migration process if disaster took place (without restarting from the beginning).</li>
 <li>Ease of monitoring - NMIG will provide detailed output about every step, it takes during the execution.</li>
 <li>
  Ease of configuration - all the parameters required for migration should be put in one single JSON document.
@@ -24,7 +22,7 @@ Chunk size can be adjusted easily via configuration file.</li>
 
 <h3>SYSTEM REQUIREMENTS</h3>
 <ul>
-<li> <b>Node.js 5.x.x</b></li>
+<li> <b>Node.js 5 or greater</b></li>
 </ul>
 
 <h3>USAGE</h3>
@@ -41,33 +39,28 @@ Chunk size can be adjusted easily via configuration file.</li>
    <li>Make sure, that username, you use in your PostgreSQL connection details, defined as superuser (usually "postgres")<br> More info: <a href="http://www.postgresql.org/docs/current/static/app-createuser.html">http://www.postgresql.org/docs/current/static/app-createuser.html</a></li>
    </ul>
 
-<p><b>4.</b> Go to nmig directory, install dependencies, and run the app with <code>--expose-gc</code> flag<br />
+<p><b>4.</b> Go to nmig directory, install dependencies, and run the app<br />
     &nbsp;&nbsp;&nbsp;&nbsp;<b>Sample:</b><br />
     <pre>$ cd /path/to/nmig</pre><br />
     <pre>$ npm install</pre><br />
-    <pre>$ node --expose-gc nmig.js</pre><br />
+    <pre>$ node nmig.js</pre><br />
 </p>
-<p>
-   &nbsp;&nbsp;
-   <b>Remark</b>: you can increase node.js memory limit (RAM usage) using <code>--max-old-space-size</code> flag<br />
-</p>
-<p>
-   &nbsp;&nbsp;
-   Following command will increase memory limit to ~2GB and run nmig
-   <br />&nbsp;&nbsp;<code>$ node --max-old-space-size=2048 --expose-gc nmig.js</code>
+
+<p><b>5</b> If a disaster took place during migration (for what ever reason) - simply restart the process
+<code>$ node nmig.js</code><br> NMIG will restart from the point it was stopped at.
 </p>
 
-<p><b>5.</b> At the end of migration check log files, if necessary.<br />&nbsp;&nbsp;&nbsp;
+<p><b>6.</b> At the end of migration check log files, if necessary.<br />&nbsp;&nbsp;&nbsp;
    Log files will be located under "logs_directory" folder in the root of the package.<br />&nbsp;&nbsp;&nbsp;
    <b>Note:</b> "logs_directory" will be created during script execution.</p>
 
 
-<p><b>6.</b> In case of any remarks, misunderstandings or errors during migration,<br /> &nbsp;&nbsp;&nbsp;
+<p><b>7.</b> In case of any remarks, misunderstandings or errors during migration,<br /> &nbsp;&nbsp;&nbsp;
    please feel free to email me
    <a href="mailto:[email protected]?subject=NMIG">[email protected]</a></p>
 
 <h3>VERSION</h3>
-<p>Current version is 1.2.0<br />
+<p>Current version is 2.0.0<br />
 (major version . improvements . bug fixes)</p>
 
 
@@ -85,11 +78,15 @@ Such step will save you ~25% of migration time. <br />
 The migration process described above without VACUUM took 58 seconds only.
 </p>
 
-<h3>LICENSE</h3>
-<p>NMIG is available under "GNU GENERAL PUBLIC LICENSE" (v. 3) <br />
-<a href="http://www.gnu.org/licenses/gpl.txt">http://www.gnu.org/licenses/gpl.txt.</a></p>
-
-
 <h3>REMARKS</h3>
 <p>Errors/Exceptions are not passed silently.<br />
 Any error will be immediately written into the error log file.</p>
+
+<h3>KNOWN ISSUES</h3>
+<ul>
+   <li>Empty strings in char/varchar columns may be interpreted as NULL.</li>
+</ul>
+
+<h3>LICENSE</h3>
+<p>NMIG is available under "GNU GENERAL PUBLIC LICENSE" (v. 3) <br />
+<a href="http://www.gnu.org/licenses/gpl.txt">http://www.gnu.org/licenses/gpl.txt.</a></p>