Answer by Slawomir for Getting around MASTER_HOST length limit in 'CHANGE...
The way I resolved it is I clicked on Modify in AWS/RDS console and shortened the DB Cluster Identifier so the resulting cluster endpoint fit in 60 characters.
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Getting around MASTER_HOST length limit in 'CHANGE MASTER TO...'?
I'm trying to configure external slave connecting to Aurora RDS. To my delight, I run into a silly problem where the Aurora cluster name - assigned by AWS - exceeds permissible MASTER_HOST limit of 60...
View ArticleReason for multiplicity of character/collation settings in MySQL?
The last 48 hours or so I spend on trying to determine the cause for sporadic crashes of my MySQL (Aurora) DB. Turns out they were attributed to my mixing of database, table, column and stored...
View ArticleAnswer by Slawomir for What does "Latest Restore Time" says in AWS RDS(Mysql)...
You can restore to any point in time during your backup retention period. To determine the latest restorable time for a DB instance, use the AWS CLI describe-db-instances command and look at the value...
View Articlerolling-up consecutive duplicates
Is there a way to "roll up" duplicate records such as time-series data in MySQL? I'm currently doing this in the application code after retrieving full time-series but the transmission of mostly...
View ArticleMySQL- reducing memory footprint
Our InnoDB/Mysql5.6 database is growing at a fairly steady pace of doubling in size every year, currently at 22Gb. This is sales data; we have a number of merchants each generating millions of rows,...
View ArticleSecuring LOAD DATA LOCAL
I need to periodically import significant number of rows from a CSV file. I'd like to be able to open up the least amount of access to the user (automation script) for this job.Is it possible to limit...
View ArticleAnswer by Slawomir for Changing location of binlog prevents starting up
I finally figured it out: MariaDB keeps an "index" file, fortunately ASCII, that you need to edit: mariadb-bin.index located in the binlog directory (or wherever your log_bin_index configuration points...
View ArticleFinding indexes that aren't used often or at all
Is there a facility or a recommended practice for determining which indexes are being used and which ones can be "purged"? At the minimum, I'm looking for a log file that over time can be analyzed for...
View ArticleAnswer by Slawomir for Under load, the following job-queue design does not...
I rewrote the logic such that the SELECT is run unconditionally, ie I got rid of the row_count() > 0 check and handle results in the client. The problem went away.
View ArticleChanging location of binlog prevents starting up
I've copied data/binlog files between MariaDB (10.3) instances and wanted to change the location of data/log files on the new machine. I adjusted the paths in the my.cnf file. On start on the new...
View ArticleTruncate temporary table commits transaction?
Is this correct that a "CREATE TEMPORARY TABLE IF NOT EXISTS.." does not commit current transaction (I like that), but a TRUNCATE TABLE, which is temporary, does implicitly commit any transaction?Does...
View ArticleWhen range partitioning, should I drop primary UUID-like key?
I'm aware of the limitation "every unique key on the table must use every column in the table's partitioning expression". So given that my primary key is a UUID, it's going to require a...
View ArticlePoint in time recovery with mariabackup
I have a full backup dir and a bunch of hourly (incremental) backup directories taken with mariabackup, which is a port of the XtraBackup. How does one restore the MariaDB up to a specific minute (or...
View ArticleWhy do I have two collations in mysqldump, under stored procs?
When I run mysqldump --routines I'm seeing multiple collations for my stored procs. Neither my DB nor columns use utf8mb (I understand the benefits of utf8mb over utf8 but let's leave it for...
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