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  1. Replies
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    Hi Sabrina, Yes, with VoltDB v4.0 you can add...

    Hi Sabrina,

    Yes, with VoltDB v4.0 you can add nodes to a running cluster without blocking or taking the cluster down. See this page: https://voltdb.com/docs/UsingVoltDB/UpdateHw.php
    section...
  2. Can you tell me what SQL was being executed? ...

    Can you tell me what SQL was being executed? Would love a repro.

    Also would be interested in hearing about your Storm use case. Perhaps email me at jpiekos at voltdb.

    Thanks,

    John
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    I'm not sure I understand the question. VoltDB...

    I'm not sure I understand the question. VoltDB clients can run on one or more machines - we've scaled VoltDB to hundreds of thousands of connections (see this blog post:...
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    You can install and run the clients on the same...

    You can install and run the clients on the same machine as the server (the database). Or you can install and run the clients on a remote machine.
    If they are on the same machine, remember that your...
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    Hi Frank, I've done some code review and...

    Hi Frank,

    I've done some code review and system testing of our JSON/HTTP interface. Here's what I've found: When you specify a username (credentials), the JSON/HTTP interface caches the VoltDB...
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    Hi Frank, Not sure if that is related - but if...

    Hi Frank,

    Not sure if that is related - but if we can have a reproducer on the issue, we can take a deeper look at it.

    From looking at the code...
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    Hi Frank, It may be a problem with...

    Hi Frank,

    It may be a problem with connection/error handling in the HTTP/JSON code? I found a couple of tickets, https://issues.voltdb.com/browse/ENG-5545, being one, that may account for what you...
  8. Hi Lorenzo, In VoltDB v4.0, snapshot...

    Hi Lorenzo,

    In VoltDB v4.0, snapshot save/restore is an Enterprise kit feature only. Our enterprise kit download includes a trial license, and we're offering community users a special upgrade...
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    > I need to be able to run the query on each of...

    > I need to be able to run the query on each of the partitions in voltdb, collate the results and give back to my Engine.

    You have 2 choices: You can run a multi-partition transaction, which...
  10. Yes, Materialized Views are partitioned (via the...

    Yes, Materialized Views are partitioned (via the table they are defined on). And yes, they work with k-safety.

    You can see our voter sample (examples/voter), for an example.

    John
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    VoltDB does not have SNMP trap support. However,...

    VoltDB does not have SNMP trap support. However, we do supply monitoring support via Nagios and New Relic.

    You might want to start with looking at our nagios scripts that we provide in the...
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    > Q1. Does this mean that the data can be...

    > Q1. Does this mean that the data can be provisioned into any of the nodes since all are active ?

    In general, you can treat the cluster as "the database". Connect to any node, and VoltDB will...
  13. You may have opted out at some point, and our...

    You may have opted out at some point, and our system won't send you emails if you requested to opt-out. Email me your email address at jpiekos/voltdb.com and I can get you opted back in.

    John
  14. K-safety is essentially "high availability"...

    K-safety is essentially "high availability" rather than scale-out. While k-safety can help read throughput (replicas can service read requests), write requests must happen on all replicas...
  15. Hi John, Online node elasticity is an...

    Hi John,

    Online node elasticity is an Enterprise-only feature. Features that are production-oriented (such as increasing throughput and data capacity online) are generally found only in the...
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    I'm not sure what you are asking, can you clarify...

    I'm not sure what you are asking, can you clarify or give a more specific example?
  17. Thread: Commit in sql

    by jpiekos
    Replies
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    Hi, VoltDB does not support the SQL COMMIT. ...

    Hi,

    VoltDB does not support the SQL COMMIT. VoltDB defines a transaction as auto-commit batches of ad-hoc SQL, as DDL defined stored procedures or, for complex business logic, as Java stored...
  18. VoltDB absolutely has a sql prompt, we call it...

    VoltDB absolutely has a sql prompt, we call it "sqlcmd". Check out our recent developer "recipe" on how to use it: http://voltdb.com/dev-center/cookbook/sqlcmd

    For a summary of various methods to...
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    If you are not concerned about network partitions...

    If you are not concerned about network partitions (and possible "split brain"), you can turn partition detection off. In that way, with a K=1 configuration, if one node goes down, the other will...
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    Perhaps upgrade your Java version. It could be...

    Perhaps upgrade your Java version. It could be this JVM bug? http://bugs.sun.com/view_bug.do?bug_id=6968646

    John
  21. See the documentation for the...

    See the documentation for the @UpdateApplicationCatalog system procedure. It updates the schema and stored procedures on a running database....
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    We don't recommend 2 nodes, because if a node...

    We don't recommend 2 nodes, because if a node crashes, the remaining node doesn't know if a network partition has occurred, or that the other node simply crashed. As a result, the surviving node has...
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    Check out the second half of this documentation...

    Check out the second half of this documentation page on network partition detection: http://voltdb.com/docs/UsingVoltDB/KsafeNetPart.php
    You are hitting the 50/50 case, given a 2 node cluster. When...
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    Hi, yes, if you do not have k-safety enabled...

    Hi, yes, if you do not have k-safety enabled (high availability - replica copies of each partition) enabled, VoltDB will shut down if it does not have a full copy of data available (due to node...
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    Please check out the readme and samples in our...

    Please check out the readme and samples in our PHP client github repository: https://github.com/VoltDB/voltdb-client-php/blob/native/examples/example.php shows an example of invoking Voter methods...
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