Increased Statistics Ratio in Database Load on Performance Insights When vCPU...
Hello, I am using AWS RDS for MySQL (8.0.42). For performance testing related to an event, I applied a spike load to the database. The load was approximately 7 to 8 times the current vCPU capacity,...
View ArticleRefresh MySQL on RDS Amazon (no replies)
Hi Experts, Iam a Microsoft sql server dba, currently taking task on MySQL on AWS RDS. I have a question how do we refresh Database from Production to Developemtn environment.If i take export the...
View ArticleMySQL Workbench username (?!?), SSL CA (?!?) (no replies)
I am studying for my third SQL certification on Coursera. It requires downloading the "Connecting to Mode Analytics - Updated.pdf" (MODE: https://mode.com/), which on page 5 provides the option to...
View ArticleMySQL running VERY slowly on a new i9 machine. Ideas or advice? (1 reply)
Hello All: I have been using MySQL 8.0.26 on my i7 Dell Inspiron laptop for about 5 years (full specs below). Last week, I purchased some upgraded hardware for an important project: An i9 CyberPowerPC...
View ArticleSQL Performance with sysbench on different disks (no replies)
Hello everybody, I have some problem about performance with sysbench on my different OVH servers, here are my results : With this command : sysbench --test=fileio --file-test-mode=seqwr run RISE-2...
View ArticleDuplicate buckets in event_statements_histogram_by_digest (no replies)
Hi, I am hoping to use the event_statements_histogram_by_digest table to extract histogram data about my queries - so that I can calculate quantiles (above what is available in...
View ArticleMySQL: New JSON format for EXPLAIN (no replies)
MySQL: New JSON format for EXPLAIN - https://blogs.oracle.com/mysql/post/new-json-format-for-explain
View ArticleWhy do users report a performance decline in 8.0? (4 replies)
Many users claim that the performance of 8.0 has declined, but this is a misconception, often based on simple sysbench test results. Users should test our open-source version in real-world...
View ArticleAnalyzing sql query performance issues (no replies)
Hello, I have few questions in regards to query performance tuning. (Note- its version 8.0.32) 1) I understand we use "explain analyze" to see the execution plan and it shows the exact resource...
View ArticleMySQL thread_stack vs memory usage (no replies)
Hey all, I run a MySQL8 DB on AWS RDS. Recently, I got a request to increase thread_stack by around 20%. While testing it on lower environments, I noticed that the DB memory usage decreased (freeable...
View ArticleFlex MySQL 8.0 on AzUre (3 replies)
This is probably an Azure question but i can't get a sensible response from MS. Did anything change on Azure's memory management for MariaDB and MySQL in the last few months? I'd been running 5...
View ArticleVariable time execution for INSERT (no replies)
Hello, I do an INSERT in a table who has around 1 million rows in MySQL 8.0. I don't know why I have different execution times for the same data to insert. For example, I measure one time 281...
View Articleinter-region data import speed issue (no replies)
Hi, A MySQL database dump is located on an AWS EC2 instance in the us-east-1 (N.Virginia) region (ec2-use1). The RDS instance is located in the ap-southeast-2 (Sydney) region (rds-apse2). I use the...
View Articlequery is super slow until either i remove one particular JOIN or the ORDER BY...
Here's my query: SELECT * FROM calls ca JOIN conferences co ON ca.conference_id = co.id JOIN conference_participants p ON co.id = p.conference_id AND p.caller_id IN ('group:40') WHERE ca.duration...
View ArticleIncredibly slow count(*) on MariaDB / MySQL (1 reply)
Problem: SELECT COUNT(*) FORM contact_activity takes ~6 minutes Profiling the query shows 100% of the time is spent over 'sending data' although it's only the count that is returned, no other data, no...
View ArticleRe: MySQL 8.0 performance degradation compared to 5.6 (no replies)
We recently upgraded from MySQL 5.6 to MySQL 8.0.36. We've noticed a significant drop in performance. A query that previously took 2 minutes to execute in MySQL 5.6 is now taking 5 minutes in MySQL...
View ArticleMysql 5.7 -> 8.0 migration (2 replies)
Hey there Recently we've been working on migration from mysql 5.7 to mysql 8.0 and after migration we found that performance for some endpoints has been degradaded. For the context, we have a cluster...
View ArticleJSON insert performance (no replies)
Hi, We plan to store JSON documents in MySQL 8.0 The documents are pretty simple: max 25 attributes, with short values. Are there any performance benchmarks? What is the maximum throughput that can be...
View Article100x to 200x InnoDB performance degradation MySQL 5.7 -> 8.0.36 ? (no replies)
Hi, I've posted in the newbies forum, because I'm completely new to MySQL 8.0 specifically (I have experience with MySQL 5.7) and have developed over 400 web apps and websites using MySQL over the...
View ArticleHyphen in FULLTEXT (3 replies)
Table have 26 milj rows, 2,3GiB (simple key, value table). InnoDB. When i do query with hyphen, query is really slow (3sec). Every other query run smootly. What can I do to fix this? Examples: SELECT...
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