Questions tagged [mariadb-10.2]

MariaDB 10.2 was released as stable (GA) with version 10.2.6 on 23 May 2017. Please also tag with mariadb for search purposes.

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Mysql service down with [ERROR] InnoDB: Page log sequence number is in the future

I have a Centos 7.9 server with MariaDB version 10.2.43. All of a sudden on May 2 2022, I have started receiving mysql down alerts. On checking I could see below log information in logs. Error 2:- ...
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4 answers
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Practical way of finding last update/insert/delete of any table in a database?

OS: W10. This question is specifically about what's possible in MariaDB, specially version "Ver 10.16 Distrib 10.2.11-MariaDB". Edit In light of the answer by Rick James I have now upgraded ...
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Mysql service stops with [ERROR] InnoDB: CORRUPT LOG RECORD FOUND

In my Plesk Obsidian version 18.0.42 running on CentOS Linux release 7.9.2009 with mysql version 10.2.43-MariaDB. All of a sudden database has stopped working. Mysql service never comes up on start ...
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mariaDB 10.2: sql mode has changed

The Upgrading from MariaDB 10.1 to MariaDB 10.2 states: SQL_MODE has been changed; in particular, NOT NULL fields with no default will no longer fall back to a dummy value for inserts which do not ...
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Unable to DROP or MODIFY a column because row size is too large

I've tried to ALTER the table to DROP the unused columns or to change the data type of some VARCHAR columns to TEXT, but I always get this error: ERROR 1118 (42000) at line 1: Row size too large (>...
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Inconsistent results between MySQL and MariaDB when using variables and order

I'm building an accounting table and I need to show the current balance on each transaction. Everything is working fine in my local environment (Windows 10 + MySQL 5.7.19), but the same query gives me ...
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2 answers
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Missing an inserted row

I am having a strange heisenbug when a set of queries in a transaction (in MariaDB 10.2.38) somehow results in missing rows afterward. I mean that there are rows inserted within the transaction, but ...
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4 answers
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In the same query INSERT, can two VALUES being NOW() return a different time?

I met a query similar to INSERT INTO mytable (id, Created, Updated) VALUES (null, NOW(), NOW()) having column definitions | Created | datetime | | Updated | datetime | Will in this case MySQL ...
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Can large data deletion affect Innodb buffer pool performance? [duplicate]

At the beginning of this year we lunched a lot of massive data deletions (millions of rows per week) in our production database. Also, there is an automatic integration of new data (insert/updates) of ...
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2 answers
158 views

How to find unused columns in MariaDB tables

I have a lot of tables in my DB that have a number of columns which might not be getting used as they slowly lost their relevance with time, I need to find such columns and delete those from the ...
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JOIN bug in MariaDB 10.2 [closed]

This is less a question than just a "beware." Thankfully MariaDB 10.2 is an old version, but it does some funky things when joining to nested derived tables. I updated my database from ...
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Connection aborts is happening in MariaDB 10.2 but not in 10.1 even with log_warnings level set to 2

I am noticing different behavior in mariadb 10.1 & 10.2 reg.connection aborts. I noticed connection getting aborted after 7 minutes(wait_timeout) of any query execution. There are few random ...
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How to use FIRST_VALUE window function in MySQL/MariaDB to get one row per group?

I'm pleased to see window functions landed in MariaDB 10.2. I thought they would be good for first-of-group problems, but I'm struggling to see how they're efficient. I have something like this: ...
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0 answers
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Why is PDO::ATTR_EMULATE_PREPARES = false causing "MySQL server has gone away" errors?

I've been using PHP PDO with the default setting of ATTR_EMULATE_PREPARES = true and it was working fine. However, I wanted to be able to select database values as integers instead of having them ...
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SLAVE off when loading data into the MASTER from another database

I have an active MASTER/SLAVE replication (Mariadb 10.2) with a single database (see scenario 1) I decided to add in IMPORT database to populate the MASTER database as described in scenario 2. ...
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3 votes
2 answers
499 views

Dropping a CHECK in mariadb?

I have a schema migration plan to add json column to mariadb 10.2. But I am required to have a reverse plan. Here's the forward plan: ALTER TABLE `mydb`.`table1` ADD COLUMN jsonf JSON DEFAULT NULL; ...
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Why is it not possible to "SELECT" Data as parameters for certain clauses like LIMIT?

EXAMPLE: CREATE TABLE t (A INT); INSERT INTO t VALUES(1),(2),(3),(4),(5); This works: SELECT A FROM t WHERE A=(SELECT 1) This does not: SELECT A FROM t LIMIT (SELECT 1); This works: SELECT A ...
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MySQL Fast Database Data Validation Master/Slave

I'm moving a MySQL database from the US to Australia and have a requirement where downtime is kept to an absolute minimum. The database is 400GB is size, replication is working without any issues. ...
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1 vote
1 answer
548 views

Does a MySQL dump that contains triggers double data on import?

I have a quick and simple question to clarify. I have medium sized database (400 Gigs) running in MariaDB 10.2 with lots of tables and lots of triggers as well. I am planning to take a mysqldump and ...
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-1 votes
1 answer
472 views

Mariadb encryption

I have a requirement to encrypt certain column of DB tables. Going through the links, have followed the below steps: In /etc/my.cnf [mysqld] plugin-load-add = file_key_management ...
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MariaDB Replication - Missing ^M Characters on Slave

I've got a simple single master->slave replication setup with MIXED binlog format for mariadb 10.2.22-1 on RHEL7. I believe I'm having an issue where '^M' characters in a longtext column are not ...
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Mysql_upgrade fails, table is corrupted

I have a mariaDB with a table that is corrupted. It's useless data to me, so I've tried to drop the schema but it won't drop. Instead, it gives me this error when trying to drop it: "Error Code: 1805....
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3 votes
1 answer
4k views

How to clear the InnoDB redo log before starting mysqld for crash recovery

System: Windows Server 2012 R2, MariaDB 10.2.8 We are currently trying to recover from a quasi-crash (it was a normal shutdown, but mysqld won't start up again) and are having problems with the redo ...
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269 views

Can XtraDB be enabled on MariaDB 10.2

Can we create a table in MariaDB 10.2 with XtraDB engine? I have installed MariaDB 10.2 and I am trying to create a table with storage engine XtraDB and I am getting error *mysql> CREATE TABLE T1(ID ...
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Fulltext search in a CTE result - missing fulltext index

My question applies to MariaDB 10.2.7 The query WITH prefiltered AS ( SELECT id, fulltext_indexed_column FROM fulltext_table WHERE id < 30 ) SELECT * FROM prefiltered WHERE MATCH(...
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MariaDB 10.2.22 Galera Cluster Using Bad Indexes After Analyze

I'm using Drupal on a MariaDB Galera 10.2.22 3 node cluster and I'm having some problems with one query. I have a table (InnoDB) called field_data_field_department which has a bunch of indexes. If I ...
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303 views

MariaDB 10.2 crash on innodb table corruption - trying to restore the database

I'm running MariaDB 10.2 on Windows and had some hard drive corruption on my server that messed up some innodb tables. Unfortunately this also affected backups, so I'm trying to dump the tables and ...
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1 answer
60 views

perform non locking select when updating another table

We need to perform the following (periodic) query in mariadb: update A set status='INACTIVE' where status='ACTIVE' and a.b_id in (select id from B where ... LOCK IN SHARE MODE); Unfortunately it ...
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1 answer
470 views

Prepared statement too slow

have an issue with MariaDB 10.2.12 running in aws rds (single master, no slave) when I run prepared statement using a variable substitution PREPARE stmt1 FROM "select ...quite complex select from ...
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2 votes
2 answers
3k views

Mysql: set variable in mysqldump

I recently added a global variable in mmy.cnf max_statement_time=120 ; to stop long running queries and to throw an exception. Its working fine. Then I am unable to run mysqldump for backing up all my ...
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1 vote
1 answer
89 views

Join against two tables to get single combined result set

tl;dr I made a SQLFiddle here http://sqlfiddle.com/#!9/031e71/1 with a minimal, complete, reproducible test case (though very specific to the problem domain of orders and products). I have a Zen Cart ...
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-1 votes
1 answer
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MySQL - Classic Date Functions

Version: 10.2.18-MariaDB I'm attempting to find the first available room within December (already included in the sample table) that will be free for 3 consecutive days. The expected output should ...
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1 vote
1 answer
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mysql : ordering a table in the order of the primary key

I have a table with a primary key consisting of two integer columns. I store ~200 millions lines in this table. My program needs to get the full table ordered by the columns of the primary key in the ...
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1 vote
1 answer
280 views

Finding temporary table name in MariaDB

As I reported some days ago to MariaDB bug tracker the following bug: https://jira.mariadb.org/browse/MDEV-17420, slave replicas with version 10.2.x are leaking temporary tables on MyISAM files. Our ...
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1 vote
0 answers
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MariaDB 10.3 slave fails to replicate from a MariaDB 10.2 master

We have a 10.2.18 master and 4 slaves with 10.2.18. Because of this bug that I've reported last week (https://jira.mariadb.org/browse/MDEV-17420) we tried to upgrade one of the replicas to 10.3.10 to ...
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1 vote
0 answers
43 views

MySQL InnoDB stop locking when large sql is executed

We face a issue that the InnoDB table is locked, when a sql file that is executed is large than a certain file size. The problem does not appear when the file size is much lower, for example 25MB. ...
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Add a New Column with ALIASES on 'date' by automation based on search results

I am trying to create a new column based on date search result. I have written a code in the link SQL fiddle as I am looking for date automation on each column based on the date format. the date ...
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5 votes
2 answers
2k views

Why am I connecting securely to MySQL when I don't have client certificates?

I don't understand the MySQL documentation for encrypted connections. The server is configured with certificates, and unless I am misreading it, the documentation says that the client must have ...
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6 votes
1 answer
2k views

Allow only unique combination of values for a composite primary key

I created the following table called books: CREATE TABLE IF NOT EXISTS `books` ( `id` BIGINT UNSIGNED NOT NULL AUTO_INCREMENT, `name` TEXT NOT NULL, PRIMARY KEY (`id`) ) ENGINE=InnoDB DEFAULT CHARSET=...
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2 answers
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Which way should be selected when move from mysql to mariadb? [closed]

Now, the mysql version is 5.1.I plan to move to mariadb 10.2.Use mysqldump and source to update databases. Based on MySQL Upgrade Strategies, Upgrading to the latest release is recommended before ...
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1 vote
1 answer
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table_open_cache increase issue - MariaDB 10.2

I'm trying to increase to 9000 but MariaDB sets it at 4895 automatically. Here is my simple config https://pastebin.com/raw/4eFiuFSv MySQLTuner output: Control warning line(s) into /var/lib/mysql/...
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1 answer
325 views

Bypass truncated data type error in `CREATE TABLE AS`

I am attempting to recreate the code from this excellent tutorial in MariaDB 10.2 to try and build nested sets from an existing adjacency list. (The goal being to ingest changes to the adjacency list ...
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1 vote
1 answer
247 views

Setup replication between two Galera nodes

I've been using MariaDB 10.2 Galera with 3 nodes successfully on local servers. Now, I have a second 3-nodes Galera cluster on another location, joined by an Site-to-Site IPSec Tunnel. I can't really ...
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2 votes
1 answer
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Partitioning increases CPU usage in mariadb

I'm using mariadb 10.2, and I had a table with a structure similar to the one below, currently with 15gb, where I insert a few thousand records per minute all the time, each batch for a specific ...
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1 vote
1 answer
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MariaDB 10.2: Why does Count(*) work, but not Count(t.*)

I have a table containing transaction details which I am importing from several vendor-provided daily reports.. I want to be sure that I am not skipping any of the files (one file per day) as I do ...
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2 votes
1 answer
442 views

GSSAPI on MariaDB

I'm using Maria 10.2.13 on Windows Server 2012 and I want to use GSSAPI authentication with it so that we can continue using windows auth. I have followed this tutorial: https://mariadb.com/kb/en/...
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1 vote
1 answer
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Can sst_state_transfer be set to rsync with innodb as storage engine in Galera cluster?

Galera cluster wsrep-sst-method docs states: You can only use rsync when anode is starting. You cannot use it with a running InnoDB storage engine. I do have InnoDB storage engine configured in ...
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1 answer
787 views

What are some practical use cases for memory tables?

Trying to learn mysql and having tons of other material to learn, I'm considering skipping memory tables, since they have many special characteristics to consider especially that they vanish, after ...
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1 answer
2k views

Next step to configuring MariaDB after successful installation

In addition to the formal documentation (i.e. https://mariadb.com/resources/blog/installing-mariadb-10-centos-7-rhel-7, etc), there are countless tutorials on installing MariaDB, however, not one of ...
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2 answers
915 views

Alternative to ORDER BY GROUP BY to get first matches per ForeignKey

Since there is so much talk and articles about this online. I simply don't seem to have enough SQL knowledge to solve this seemingly simple problem. I have a table with layered data for a Price per ...
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