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<p class="MsoNormal"><span style="mso-fareast-language:EN-US">Ok,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US">here a roundup of the features I will submit:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US">Checkpoints = "Consistent" "Blocking" (https://github.com/diennea/herddb/wiki/Data-storage https://github.com/diennea/herddb/wiki/Checkpoints-configuration)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US">Concurrency Control = "Pessimistic Row Level Locking"<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US">Foreign Keys = "Not Supported" (https://github.com/diennea/herddb/wiki/SQL-Support)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US">Data Model = "Relational" (https://github.com/diennea/herddb/wiki/SQL-Support)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US">Indexes = "B-Link" "BRIN" (Block Range Index implementation is not strictly speaking the official BRIN implementation you can find in literature, so we can talk about “BRIN-like” indexes)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US">Isolation Levels = "Read Committed" (https://github.com/diennea/herddb/wiki/SQL-Support)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US">Joins = "Nested Loop Join" "Sort-Merge Join" "Hash Join" (https://github.com/diennea/herddb/wiki/SQL-Support)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US">Query Compilation = “Code Generation”<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US">Query Execution = “Tuple-at-a-Time Mode”<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US">Query Interface = "SQL" "Command-line/Shell" "Custom API" (https://github.com/diennea/herddb/wiki/SQL-Support)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US">Storage Architecture = "Disk-oriented" (https://github.com/diennea/herddb/wiki/Data-storage)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US">Storage Model = "N-ary Storage Model (Row/Record)" (https://github.com/diennea/herddb/wiki/Data-storage)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US">Storage Organization = "Log-structured" (https://github.com/diennea/herddb/wiki/Data-storage)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US">Stored Procedures = "Not Supported" (https://github.com/diennea/herddb/wiki/SQL-Support)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US">System Architecture = "Shared-Nothing" (https://github.com/diennea/herddb/wiki/Replication)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US">Views = "Not Supported" (https://github.com/diennea/herddb/wiki/SQL-Support)<o:p></o:p></span></p>
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Regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US">Ale<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b>Da:</b> herddb-dev-bounces@lists.herddb.org <herddb-dev-bounces@lists.herddb.org>
<b>Per conto di </b>Enrico Olivelli<br>
<b>Inviato:</b> lunedì 26 agosto 2019 13:21<br>
<b>A:</b> Herddb developers <herddb-dev@lists.herddb.org><br>
<b>Oggetto:</b> Re: [Herddb-dev] R: R: Herddb entry on dbdb.io<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Il lun 26 ago 2019, 10:03 Alessandro Luccaroni - Diennea <<a href="mailto:alessandro.luccaroni@diennea.com">alessandro.luccaroni@diennea.com</a>> ha scritto:<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US">>> Storage Model = "N-ary storage model” means that the column are stored together in a row-by-row basis (like a very wide csv?). I think we can safely say only
“Key/Value” in our case</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">> We are saving all of the columns of a row into the same page, all packed<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US">So what model do you think is more representative of HerdDB, “Key/Value”?</span><o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">N-ary storage mode is better<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US">>> Query Compilation = “Code Generation”: is this related to our usage of Apache Calcite?</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">> We are not "compiling" code, we have an access plan that is prepared by Apache Calcite and then translated to an internal representation.
<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US">Can we say that this is guaranteed by our usage of Apache Calcite?</span><o:p></o:p></p>
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<p class="MsoNormal">Not sure we can say that. It is more HerdDB code.<o:p></o:p></p>
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<p class="MsoNormal">Calcite decides how to access data.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">I think that in the end 'Code generation' may be a good choice. But not due to Calcite<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US">>> Query Execution = “Vectorized Model”: is this related to our usage of Apache Calcite?</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">> Where did you find the list of available values ?<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">> I feel "Vectorized Model" is not out option<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">I copied the wrong entry, last time you suggested “<span lang="EN-US">Tuple-at-a-Time Mode”.</span><o:p></o:p></p>
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<p class="MsoNormal">+1<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US">Can we say that this is guaranteed by our usage of Apache Calcite?</span><o:p></o:p></p>
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<p class="MsoNormal">No, it it a core feature, Calcite doesn't deal with this stuff IMO<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Thanks<o:p></o:p></p>
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<p class="MsoNormal">Enrico<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Regards,<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Alessandro<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><b>Da:</b>
<a href="mailto:herddb-dev-bounces@lists.herddb.org" target="_blank">herddb-dev-bounces@lists.herddb.org</a> <<a href="mailto:herddb-dev-bounces@lists.herddb.org" target="_blank">herddb-dev-bounces@lists.herddb.org</a>>
<b>Per conto di </b>Enrico Olivelli<br>
<b>Inviato:</b> venerdì 23 agosto 2019 23:26<br>
<b>A:</b> Herddb developers <<a href="mailto:herddb-dev@lists.herddb.org" target="_blank">herddb-dev@lists.herddb.org</a>><br>
<b>Oggetto:</b> Re: [Herddb-dev] R: Herddb entry on <a href="http://dbdb.io" target="_blank">
dbdb.io</a><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Il giorno mar 2 lug 2019 alle ore 10:51 Alessandro Luccaroni - Diennea <<a href="mailto:alessandro.luccaroni@diennea.com" target="_blank">alessandro.luccaroni@diennea.com</a>> ha
scritto:<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US">Regarding the open points:<br>
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Checkpoint = the “Consistent” option is not clear or the doc link provided is not clear?
<a href="http://dbdb.io" target="_blank">dbdb.io</a> provide the following options: “Blocking”, “Consistent”, “Fuzzy”, “Non-Blocking”, “Not Supported”. Since the checkpoint freeze the DB (and in a checkpoint there are all the info needed to bring up a replica),
I think it should be “Consistent” + “Blocking” (see PostgreSQL entry for some background around “Consistent”
<a href="https://dbdb.io/db/postgresql" target="_blank">https://dbdb.io/db/postgresql</a>)</span><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">We are blocking only writes, but Consistent + Blocking is okay
<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US">Joins =
<a href="http://dbdb.io" target="_blank">dbdb.io</a> provide the following options: “Broadcast Join”, “Has Join”, “Index Nested Loop Join”, “Nested Loop Join”, “Not Supported”, “Semi Join”, “Shuffle Join”, “Sort-Merge Join”. Which ones do we choose? Is it going
to change after the Calcite 1.20 upgrade?</span><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Nested Loop, Sort-Merge-Join (but actually there is some bug in Calcite and it is never used), Hash Join<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US">Storage Architecture = it’s related to where the data is saved (disk, memory or both)…since we are planning about <a href="https://github.com/diennea/herddb/issues/401" target="_blank">https://github.com/diennea/herddb/issues/401</a>
I think our use case is “Hybrid” (it means that you can choose between the two in
<a href="http://dbdb.io" target="_blank">dbdb.io</a> terminology)</span><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">I would say "disk"
<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US">Storage Model = "N-ary storage model” means that the column are stored together in a row-by-row basis (like a very wide csv?). I think we can safely say only
“Key/Value” in our case</span><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">We are saving all of the columns of a row into the same page, all packed<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US">Storage Organization = I will keep both "Log-structured" and "Heaps" since we store data both on data file and on the Bookie log</span><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Mostly like "Log-structured"
<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US">Concurrency Control = “Deterministic Concurrency Control “: is this guaranteed by Bookkeeper? Can you point me in the code and/or documentation where we can extrapolate
that?</span><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Concurrency Control....we are using "pessimistic row level locking", before accessing to a record the client acquires a lock (read or write).<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Each Transaction that modifies a record holds the new copy of the record in a local buffer, and this new version is not visible to other transactions until the tx is committed.<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">BookKeeper is out of the game, we are using it only for the WAL<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US">Query Compilation = “Code Generation”: is this related to our usage of Apache Calcite?</span><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">We are not "compiling" code, we have an access plan that is prepared by Apache Calcite and then translated to an internal representation.
<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span lang="EN-US">Query Execution = “Vectorized Model”: is this related to our usage of Apache Calcite?</span><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Where did you find the list of available values ?<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">I feel "Vectorized Model" is not out option<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Cheers<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;margin-left:22.05pt">
Enrico <o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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