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Status Under review
Workspace Informix
Components Informix Server
Created by Guest
Created on Jun 22, 2022

Identify/log slow queries on a busy system

SQLTrace offers the DBA the tooling required to monitor a user session. However its difficult to monitor heavily used systems. For example one needs to have a buffer large enough to store 90 seconds of SQL queries (small lookup SQL's consume the buffer really quickly) and copy syssqltrace every minute or less to a static table, filtering queries whose execution time is above a specific threshold.

This approach is wasteful and is prone to have gaps on the data depending on system load. For this purpose, I am proposing to implement a query log similar to the "slow query log" in MariaDB/MySQL (https://mariadb.com/kb/en/slow-query-log-overview/) and PostgreSQL (https://www.postgresql.org/docs/14/runtime-config-logging.html#RUNTIME-CONFIG-LOGGING-WHEN)

This RFE is about, implementing slow query log as follows:

* Introduce a parameter equivalent to MySQL/MariaDB long_query_time or PostGreSQL log_min_duration_statement

* Write to a table/file the query whose execution time exceeds the parameter introduced above. At this stage the query plan is not required as the DBA can generate it at a later stage. Given that the engine, has all the information at hand, the writing out this information is cheap in terms of computation resource, yet extremely valuable for the DBA.


Needed By Month