<div dir="auto"><div>Alessandro</div><div dir="auto">Overall looks good</div><div dir="auto"><br></div><div dir="auto">Last answers inline below</div><div dir="auto"><br></div><div dir="auto">Enrico<br><br><div class="gmail_quote" dir="auto"><div dir="ltr" class="gmail_attr">Il gio 27 giu 2019, 16:09 Alessandro Luccaroni - Diennea <<a href="mailto:alessandro.luccaroni@diennea.com">alessandro.luccaroni@diennea.com</a>> ha scritto:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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<p class="MsoNormal"><span lang="EN-US">Hi all,<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US">I was thinking about sending an email to Carnagie Mellon Database Group about the entry of Herddb on
<a href="https://dbdb.io/db/herddb" target="_blank" rel="noreferrer">https://dbdb.io/db/herddb</a><u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US"><u></u> <u></u></span></p>
<p class="MsoNormal"><span lang="EN-US">I’ve grouped up a bunch of information about Herd, can you check if everything seems correct?<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US"><u></u> <u></u></span></p>
<p class="MsoNormal"><span lang="EN-US">Checkpoints = "Consistent" (<a href="https://github.com/diennea/herddb/wiki/Data-storage" target="_blank" rel="noreferrer">https://github.com/diennea/herddb/wiki/Data-storage</a> <a href="https://github.com/diennea/herddb/wiki/Checkpoints-configuration" target="_blank" rel="noreferrer">https://github.com/diennea/herddb/wiki/Checkpoints-configuration</a>)<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US">Foreign Keys = "Not Supported" (<a href="https://github.com/diennea/herddb/wiki/SQL-Support" target="_blank" rel="noreferrer">https://github.com/diennea/herddb/wiki/SQL-Support</a>)<u></u><u></u></span></p>
<p class="MsoNormal">Data Model = "Relational" (<a href="https://github.com/diennea/herddb/wiki/SQL-Support" target="_blank" rel="noreferrer">https://github.com/diennea/herddb/wiki/SQL-Support</a>)<u></u><u></u></p>
<p class="MsoNormal"><span lang="EN-US">Indexes = "B-Link" "BRIN" (<a href="https://github.com/diennea/herddb/blob/master/herddb-utils/src/main/java/herddb/index/blink/BLink.java" target="_blank" rel="noreferrer">https://github.com/diennea/herddb/blob/master/herddb-utils/src/main/java/herddb/index/blink/BLink.java</a> <a href="https://github.com/diennea/herddb/tree/master/herddb-core/src/main/java/herddb/index/brin" target="_blank" rel="noreferrer">https://github.com/diennea/herddb/tree/master/herddb-core/src/main/java/herddb/index/brin</a>)<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US">Isolation Levels = "Read Committed" (<a href="https://github.com/diennea/herddb/wiki/SQL-Support" target="_blank" rel="noreferrer">https://github.com/diennea/herddb/wiki/SQL-Support</a>)<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US">Joins = "Nested Loop join" (<a href="https://github.com/diennea/herddb/wiki/SQL-Support" target="_blank" rel="noreferrer">https://github.com/diennea/herddb/wiki/SQL-Support</a>)<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US">Query Interface = "SQL" "Command-line/Shell" (<a href="https://github.com/diennea/herddb/wiki/SQL-Support" target="_blank" rel="noreferrer">https://github.com/diennea/herddb/wiki/SQL-Support</a>)<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US">Storage Architecture = "Hybrid" <u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US">Storage Model = "Key/Value" "N-ary Storage Model (Row/Record)" (<a href="https://github.com/diennea/herddb/wiki/Data-storage" target="_blank" rel="noreferrer">https://github.com/diennea/herddb/wiki/Data-storage</a>)<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US">Storage Organization = "Log-structured" "Heaps" (<a href="https://github.com/diennea/herddb/wiki/Data-storage" target="_blank" rel="noreferrer">https://github.com/diennea/herddb/wiki/Data-storage</a>)<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US">Stored Procedures = "Not Supported" (<a href="https://github.com/diennea/herddb/wiki/SQL-Support" target="_blank" rel="noreferrer">https://github.com/diennea/herddb/wiki/SQL-Support</a>)<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US">System Architecture = "Shared-Nothing" (<a href="https://github.com/diennea/herddb/wiki/Replication" target="_blank" rel="noreferrer">https://github.com/diennea/herddb/wiki/Replication</a>)<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US">Views = "Not Supported" (<a href="https://github.com/diennea/herddb/wiki/SQL-Support" target="_blank" rel="noreferrer">https://github.com/diennea/herddb/wiki/SQL-Support</a>)<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US"><u></u> <u></u></span></p>
<p class="MsoNormal"><span lang="EN-US">I’m still in doubt about some other definition, see below with some “option” using the <a href="http://dbdb.io" target="_blank" rel="noreferrer">dbdb.io</a> “nomenclature”:<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US"><u></u> <u></u></span></p>
<p class="MsoNormal"><span lang="EN-US">“Concurrency Control”<u></u><u></u></span></p>
<p class="m_98043319007277627MsoListParagraph"><u></u><span lang="EN-US"><span>1)<span style="font:7.0pt "Times New Roman"">
</span></span></span><u></u><span lang="EN-US">Deterministic Concurrency Control</span></p></div></div></blockquote></div></div><div dir="auto"><br></div><div dir="auto">This one is the best</div><div dir="auto"><div class="gmail_quote" dir="auto"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div lang="IT" link="#0563C1" vlink="#954F72"><div class="m_98043319007277627WordSection1"><p class="m_98043319007277627MsoListParagraph"><span lang="EN-US"><u></u><u></u></span></p>
<p class="m_98043319007277627MsoListParagraph"><u></u><span lang="EN-US"><span>2)<span style="font:7.0pt "Times New Roman"">
</span></span></span><u></u><span lang="EN-US">Multi-version Concurrency Control (MVCC)<u></u><u></u></span></p>
<p class="m_98043319007277627MsoListParagraph"><u></u><span lang="EN-US"><span>3)<span style="font:7.0pt "Times New Roman"">
</span></span></span><u></u><span lang="EN-US">Optimistic Concurrency Control (OCC)<u></u><u></u></span></p>
<p class="m_98043319007277627MsoListParagraph"><u></u><span lang="EN-US"><span>4)<span style="font:7.0pt "Times New Roman"">
</span></span></span><u></u><span lang="EN-US">Timestamp Ordering<u></u><u></u></span></p>
<p class="m_98043319007277627MsoListParagraph"><u></u><span lang="EN-US"><span>5)<span style="font:7.0pt "Times New Roman"">
</span></span></span><u></u><span lang="EN-US">Two-Phase Locking (Deadlock Detection)<u></u><u></u></span></p>
<p class="m_98043319007277627MsoListParagraph"><u></u><span lang="EN-US"><span>6)<span style="font:7.0pt "Times New Roman"">
</span></span></span><u></u><span lang="EN-US">Two-Phase Locking (Deadlock Prevention)<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US"><u></u> <u></u></span></p>
<p class="MsoNormal"><span lang="EN-US">“Query Compilation”<u></u><u></u></span></p>
<p class="m_98043319007277627MsoListParagraph"><u></u><span lang="EN-US"><span>1)<span style="font:7.0pt "Times New Roman"">
</span></span></span><u></u><span lang="EN-US">Code Generation<u></u><u></u></span></p>
<p class="m_98043319007277627MsoListParagraph"><u></u><span lang="EN-US"><span>2)<span style="font:7.0pt "Times New Roman"">
</span></span></span><u></u><span lang="EN-US">JIT Compilation<u></u><u></u></span></p>
<p class="m_98043319007277627MsoListParagraph"><u></u><span lang="EN-US"><span>3)<span style="font:7.0pt "Times New Roman"">
</span></span></span><u></u><span lang="EN-US">Not Supported</span></p></div></div></blockquote></div></div><div dir="auto"><br></div><div dir="auto"><br></div><div dir="auto">This is better</div><div dir="auto"><div class="gmail_quote" dir="auto"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div lang="IT" link="#0563C1" vlink="#954F72"><div class="m_98043319007277627WordSection1"><p class="m_98043319007277627MsoListParagraph"><span lang="EN-US"><u></u><u></u></span></p>
<p class="m_98043319007277627MsoListParagraph"><u></u><span lang="EN-US"><span>4)<span style="font:7.0pt "Times New Roman"">
</span></span></span><u></u><span lang="EN-US">Stored Procedure Compilation<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US"><u></u> <u></u></span></p>
<p class="MsoNormal"><span lang="EN-US">“Query Execution”<u></u><u></u></span></p>
<p class="m_98043319007277627MsoListParagraph"><u></u><span lang="EN-US"><span>1)<span style="font:7.0pt "Times New Roman"">
</span></span></span><u></u><span lang="EN-US">Materialized Model<u></u><u></u></span></p>
<p class="m_98043319007277627MsoListParagraph"><u></u><span lang="EN-US"><span>2)<span style="font:7.0pt "Times New Roman"">
</span></span></span><u></u><span lang="EN-US">Tuple-at-a-Time Model</span></p></div></div></blockquote></div></div><div dir="auto"><br></div><div dir="auto">This one</div><div dir="auto"><div class="gmail_quote" dir="auto"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div lang="IT" link="#0563C1" vlink="#954F72"><div class="m_98043319007277627WordSection1"><p class="m_98043319007277627MsoListParagraph"><span lang="EN-US"><u></u><u></u></span></p>
<p class="m_98043319007277627MsoListParagraph"><u></u><span lang="EN-US"><span>3)<span style="font:7.0pt "Times New Roman"">
</span></span></span><u></u><span lang="EN-US">Vectorized Model<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US"><u></u> <u></u></span></p>
<p class="MsoNormal"><span lang="EN-US">But we could also use some terminology that is not currently cover (for example currently there are no DBMS mapped with either BRIN or B-Link indexes, but we support them).<u></u><u></u></span></p>
<p class="MsoNormal"><span lang="EN-US"><u></u> <u></u></span></p>
<p class="MsoNormal"><b><span style="font-size:13.0pt;font-family:"Arial",sans-serif">Alessandro Luccaroni</span></b><span>
<br>
</span><span style="font-size:10.0pt;font-family:"Arial",sans-serif">Platform Manager @ Diennea - MagNews<br>
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<p class="MsoNormal"><u></u> <u></u></p>
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