The tag has no wiki summary.

learn more… | top users | synonyms

1
vote
1answer
47 views

Is it normal that I have to FLUSH QUERY CACHE once every 6 hours to maintain fast queries?

I am running MySQL 5.5.37. I have a cronjob set to run every 6 hours to flush the query cache. I realized that if I don't do that, then the cache becomes fragmented and average query response time ...
1
vote
0answers
46 views

Flush procedure cache or drop and create?

Okay I had a very strange issue today on SQL Server 2005. We had a stored procedure update that added new parameters to part of it. One database out of ~150 or more seem to not work properly. Using ...
1
vote
0answers
56 views

mysql vs mongodb cache/load balancing

I have a system where users can 'like' content. There will likely be many hundreds of these likes going on at once. I'd like it to be AJAX driven so you get an immediate response. At the moment I ...
1
vote
0answers
538 views

SELECT + INSERT + Query Cache = MySQL lock up

MySQL server seems to constantly lock up and stop responding on certain types of queries and eventually (after couple of minutes of not responding) give up with an error "MySQL server has gone away", ...
1
vote
1answer
1k views

What are the pros and cons of using CLIENT_RESULT_CACHE_SIZE and RESULT_CACHE_MODE

I have multiple questions For Oracle Database 11g Release 11.2.0.1.0 what are the benefits of using CLIENT_RESULT_CACHE_SIZE and RESULT_CACHE_MODE. How will the CLIENT side cache be kept sync if ...
0
votes
1answer
734 views

Calculating time spent on query cache lock

How can I calculate the total time my MySQL database is spending Waiting for query cache lock ? I've found two specific very simple tables that adding a SQL_NO_CACHE drastically improved the ...
0
votes
1answer
65 views

MySQL Query Cache - what type of queue is used?

I am wondering what type of queue is MySQL Query Cache using. When there is new query and cache is full which query is deleted? Oldest one? One with fewer number of hits? Or maybe there is some ...
0
votes
1answer
100 views

Does SQL Server cache data results for DAO?

I was surprised to be confronted with the idea that using .NET and DAO one could make use of the SQL Server data cache in a way not at all possible with stored procedures (which benefit from the plan ...
0
votes
1answer
47 views

Oracle scheduler chain priority in data warehouse applications

The scenario is as follows: We have a data warehouse type application that relies on the Oracle job scheduler and a Chain. This chain is responsible for generating materialized views (caches) that ...
0
votes
1answer
108 views

Pagination, check number of selected records

I am working on pagination for a complex join query and unfortunately I am not sure what's the best way to go... Right now I am thinking about the following solution. Imagine that SELECT id... is the ...
0
votes
1answer
190 views

Columns count in SELECT query and SQL Server buffer cache

Let's assume that I have a table with 30-50 millions records. It has ~40 columns. Currently when I request data it always requests all columns because of legacy ORM that we use. I know that if we ...
0
votes
0answers
33 views

Reducing the size of a PostgreSQL Database, utilizing a process other than full VACUUM

We have a Postgres 8.4 installation which hosts both our Defect tracking and Code management (Surround) systems. We are looking at converting and migrating Surround to MSSQL on another server. Our ...
0
votes
0answers
26 views

MySQL MEMORY Engine vs NoSQL in-memory

I have a WebService that runs a hybrid functionality of Secure WebSockets and HTTPS REST API. Both functionalities translate the calls to the same under-the-hood generic calls, wherein the WebService ...
0
votes
1answer
60 views

Lowering MySQL Memory Usage without Restart

We are using Percona Server 5.5.35-rel33.0-611.precise with InnoDB in our production server. Recently Mysql memory went high and it did't drop from there. We are afraid whether it would result in OOM ...
0
votes
2answers
64 views

How to determine if open_table_cache is set properly?

Does anyone know what this really means? (from MySQL docs) You can determine whether your table cache is too small by checking the mysqld status variable Opened_tables, which indicates the ...
0
votes
0answers
97 views

table_open_cache

I know table_open_cache, max_connections, and open_files_limit are related. Is there a tried and true way to set table_open_cache correctly? I have raise it three times and still MySQL Enterprise ...
0
votes
0answers
26 views

Database cache problem

I have server based on Linux 64 Bit centos 6.5 and Mysql innoDB engine I created database for php script require database installation , after i successfully finished installation for first time i ...
0
votes
0answers
25 views

Should store procedures be cached?

Should store procedures be cached in MySQL? If so, How long it is stay in cache? In my case, When I call one stored procedure first time, it is giving me results in 1 second, after that it gives me ...
0
votes
0answers
148 views

Req: Typical location of mysql query cache

My MVC framework (CodeIgniter) wants to know where my database (mysql 5.5) writes its query cache. My Ubuntu installation is unexceptional. Would that be /var/lib/mysql/ or further down the chain, ...
0
votes
0answers
439 views

Temporarly disable cache in oracle 11g

I want to disable the caching for my session in oracle 11g to see how long a query takes. Is this possible or is there a better way for meassuring the time a query takes to run?
0
votes
1answer
134 views

getting error while installing memcached_function

now i am working with memcached with mysql cluster 7.2 for that i am installed libevent-1.4.14b-stable.tar.gz memcached-1.4.5.tar.gz libmemcached-0.8.tar.gz then ...
-4
votes
0answers
89 views

Why is LRU is not suitable for joining 2 relations in DBMS [closed]

In DBMS, can someone please explain how the LRU (least recently used) buffer replacement policy acts when joining 2 relations in a database? I have read that LRU is not efficient when joining two ...