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I recently installed pg_stat_monitor to find top queries,
and after executing 'create extension pg_stat_monitor;' and then running 'select * from pg_stat_monitor;', I
noticed that the DBMS became si…
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```
What steps will reproduce the problem?
1. Set up master/slave replication on a very large data set with
low-cardinality indexes. In this case the data set was about 3-4TB in size.
2. Configur…
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- See what queries are slow, and what we might still need to optimize
- Analyze queries
- Optimize slow queries
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When a query was very slow in its execution, the following queries also became slow regardless of whether the consulted table is small, in this case, the solution is to close omniDB and open it again.…
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c-ares does no caching which means repeated queries to the same hostnames will be slower than system dns
Unlike `getaddrinfo`, c-ares includes the TTL for the DNS query. That means we can do cachi…
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Changefeeds are not currently exercised in logic tests or other data driven testing. Adding coverage here could close some test coverage gaps and add an intuitive method to test changefeeds.
Some b…
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SiteTreeContentReview extension does a [global order by query filtered by a where on a non-indexed column](https://github.com/silverstripe/silverstripe-contentreview/blob/4/src/Extensions/SiteTreeCont…
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```
Support for measuring mongodb statistics in a Web application
1) Need slow running queries along with execution time along with root cause
2) Recommendation for slow running queries if possible.
…
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After troubleshooting slowdowns in order status change from a customer with a large catalogue I noticed that there are two queries that takes a very lot of time to run.
**ValidateOrder** method and…
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I have a situation when one model has two different context for tags and those are used in a search filtering system. When im searching for 10+ tags with #tagged_with(tags, :on => :context), the amoun…