How to check max session count? and current session count??

HyeontaeJuHyeontaeJu Vertica Customer

Hello, I'm managing a vertica database cluster and more and more projects will use vertica database.
today, connection timeout exception is occured when i run another project which use vertica database.

so.. i doubt that the connection session count reach max connection session count

How to check max session count? and current session count??

Answers

  • moshegmosheg Vertica Employee Administrator
    edited October 2021

    • To determine the original value for the MaxClientSessions parameter:
    => SELECT CURRENT_VALUE FROM CONFIGURATION_PARAMETERS WHERE parameter_name='MaxClientSessions';

    CURRENT_VALUE

    50
    (1 row)
    • To increase the MaxClientSessions parameter to 100 (for example) do:
    => SELECT SET_CONFIG_PARAMETER('MaxClientSessions', 100);

    BTW, I would expect to see an error like: "New session rejected due to limit, already 55 sessions activ"
    To monitor requests for resources that are rejected by the Resource Manager do: SELECT * FROM resource_rejections;
    The V_MONITOR.ERROR_MESSAGES system table tracks error and warning messages encountered while processing queries.
    SELECT event_timestamp, user_name, message FROM error_messages ORDER BY event_timestamp DESC;
    and check also dc_errors;

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