query-cache

What if I have a query that gets called multiple times in a single thread, and I just want to cache that query (and its result) for that thread (or for that session since I'm using one session per thread), how can I do that ? Note: My 2nd level cache is turned on but it's used mostly for session.get(...). But I do not want to use it for my query cache because I only need it to live for the duration of my thread ( / session ). Thanks ChssPly76 The bottom line here is: you can either manually cache your query results or you can ask Hibernate to do it. While it generally makes little sense to

I have an app on heroku, running on Puma: workers 2 threads_count 3 pool 5 It looks like some requests get stuck in the middleware, and it makes the app very slow (VERY!). I have seen other people threads about this problem but no solution so far. Please let me know if you have any hint. ! ! I work for Heroku support and Middleware/Rack/ActiveRecord::QueryCache#call is a commonly reported as a problem by New Relic. Unfortunately, it's usually a red herring as each time the source of the problem lies elsewhere. QueryCache is where Rails first tries to check out a connection for use, so any

I am trying to understanding if Statement caching is useful in case of parametrized prepared statements. As per my understanding If I use caching, then query will cached based on its 'String'. In this case, if a query has different values of parameter then it is a different / new statement/string w.r.t. caching. Also, when parameters change, the results also change. Since prepared statements are parameterized, is it really useful to use caching in this case. I am using JDBC/Snaq DB Pool/ MySQL database. Statement Caching here is referred to two different cases: JAVA: Snaq DB pool provided

Is first level cache different from query cache in hibernate? I have seen articles mentioning about first level and query cache, so i am confused. First level cache is enabled by default and is per session basis. Query cache is not enabled by default, is shared across multiple sessions and should always be used in conjunction with the second-level cache. To enable query cache, the following properties should be used: hibernate.cache.use_second_level_cache=true hibernate.cache.use_query_cache=org.hibernate.cache.EhCacheProvider hibernate.cache.use_query_cache=true gabrielgiussi Yes, are

This is a pretty simple problem. Inserting data into the table normally works fine, except for a few times where the insert query takes a few seconds. (I am not trying to bulk insert data.) So I setup a simulation for the insert process to find out why the insert query occasionally takes more than 2 seconds to run. Joshua suggested that the index file may be being adjusted; I removed the id (primary key field), but the delay still happens. I have a MyISAM table: daniel_test_insert (this table starts completely empty): create table if not exists daniel_test_insert ( id int unsigned auto

I have a 16GB dedicated Mysql server database.My innodb_buffer_pool_size is set to around 11GB ,i am implementing query cache in my system ,which has a size of 80mb. From where should i make this space ,innodb_buffer_pool_size or RAM ? RolandoMySQLDBA Back in Jun 2014 I answered https://dba.stackexchange.com/questions/66774/why-query-cache-type-is-disabled-by-default-start-from-mysql-5-6/66796#66796 In that post, I discussed how InnoDB micromanages changes between the InnoDB Buffer Pool and the Query Cache. NOT USING THE QUERY CACHE The simplest answer would be to just disable the query cache,

Related to this question Premise: These are my assumptions, based on my reading, experience and understanding, they may be wrong, if they are, please comment and I'll edit the question. Query cache is good mostly along with 2nd level cache Query cache caches the identifiers results of queries + parameters Query cache is risky if the database was changed, and it wasn't reflected to the cache Question: I have an object that is not in the 2nd level cache. Due to some bad programming or other constraints, the code that loads the object is being called several time in the same hibernate session.