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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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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1answer
28 views

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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107 views

1 Galera node freezes, rejoin is ok but not working

We have a 5-node Galera cluster in a high-load application. One of the nodes freezes in production. Still the cluster-size=5 and Galera/WSREP writes to this node, but the node is not working. Then we ...
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2answers
154 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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13 views

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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1answer
42 views

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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160 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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1answer
208 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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20 views

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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1k views

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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1answer
2k 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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172 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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74 views

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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1answer
125 views

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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223 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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1answer
33 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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1answer
235 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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2answers
1k 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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1answer
59 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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1answer
37 views

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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1answer
605 views

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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1answer
143 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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755 views

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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42 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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1answer
913 views

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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1answer
1k 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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1answer
1k 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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2answers
198 views

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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1answer
1k views

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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1answer
193 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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1answer
204 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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1answer
621 views

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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1answer
2k views

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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1answer
327 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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1answer
321 views

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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1answer
539 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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1answer
1k 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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2answers
635 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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3answers
6k views

The table is full - MariaDB

I am getting the following error whist trying to execute a long running query. The table 'C:\Windows\SERVIC~2\NETWOR~1\AppData\Local\Temp#sql1664_349_19be' is full The C drive (NTFS) on the server ...
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1answer
243 views

MariaDB optimisation [closed]

I stuck a bit with setting the best performance of MariaDB on my VPS. I have: 6 cores; 16GB RAM; 300GB SSD; CloudLinux; LiteSpeed >> MySQLTuner 1.7.0 - Major Hayden <major@mhtx.net> &...
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1answer
529 views

Galera Failures

I have 2 nodes. One a VPS on NFO Servers and another on Azure. I have setup the firewalls/disabled the firewalls. The nodes are CentOS 7, Latest Kernel. The configs are as follows: Node 1 (Master DB) ...
2
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2answers
482 views

Configure MariaDB client with host-specific credentials?

How can I configure my MariaDB client (mysql) so that I don't have to enter a password to connect, regardless of which host I am connecting to? I can't just put a password in the [client] section of ~...
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0answers
13 views

Enforce existence of cartesian product in join table without triggers in MariaDB 10.2

Given tables A, B and C, where C holds a foreign key to both A and B (i.e. C is a "join table"), is it possible to define a constraint so that C contains the whole Cartesian product A x B without ...
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320 views

Unable to install Mariadb on Fedora 27 due to SELinux issue

I followed these instructions in installing mariadb on my fedora 27 VM. My mariadb.repo is configured as follows: [mariadb] name = MariaDB baseurl = http://yum.mariadb.org/10.2.12/fedora26-amd64 ...
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65 views

Prepared query refused by MySQL when using placeholders

I'm trying to make a prepared query but MySQL refuses to accept it when I use placeholders: This query works WITH x AS (SELECT 'root' as user_id) SELECT x.user_id FROM x LEFT JOIN user ON (x.user_id ...
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1answer
1k views

mariadb galera bootstrapping fails

Starting point at the sandbox sb1, sb2, sb3: All boxes identical. A Fresh debian 9 install mariadb 10.2 Galera3 build a test galera cluster with empty databases works fine. All three nodes come up and ...
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2answers
1k views

json functions: double quotes added when going through a variable

Im stuck with what it seems simple question, when I create a JSON using the MariaDB/MySQL json functions going through variables, it adds double quotes which is annoying. However, if I don't go ...