All versions of MySQL (not Microsoft SQL Server). Please also add a version-specific tag like mysql-5.7 if that is relevant to the question.

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561 views

Replication Broken, List Out of Sync Tables

In a master-slave setup on MySQL 5.5 on RHEL 6.1, when db replication breaks (for whatever reason), what is a good way to: check (and alert) replication is broken? get a list of tables that are out ...
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168 views

Determining replication traffic

is there any way to determine from server statistics* running MySQL, how much traffic(bits per second) WOULD replication consume between 2 servers, without setting-up the actual replication between ...
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905 views

mysql 5.6 gtid replication slave stuck (system lock)?

I have set up 5.6 gtid based replication (on 5.6.26) it seemed to work when I did it, it replicated my random test db over that I created beside normal data. However at some point something must have ...
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3answers
528 views

Are TEXT fields stored separately from the row in MySQL-ISAM?

We have a "notes" table and some of the queries are getting very slow even though we're not searching on the note contents. We're wondering if moving the note content into a separate table would speed ...
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250 views

in-memory SQL database system [closed]

In an application, I am using mysql's TEMPORARY TABLE. Since this application does not need permanent tables, I wonder if I can find an alternative RDMS designed for memory tables. I hope to find an ...
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0answers
81 views

Innobackupex restore steps from 1 incremental and multiple incremental steps

My current backup plan is: Full -> Incremental1 based on full -> incremental2 based on incremental1 -> incremental3 based on incremental2... Please validate if this steps is correct during emergency ...
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1answer
71 views

Multi-Column PK or Auto-Increment PK?

In another question I mentioned that I have a table where, in order to ensure uniqueness, I need to use multiple columns as the PK. However, lookups are usually only done using the first of those ...
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1answer
2k views

Many transactions are getting stuck in the “cleaning up” state - what could cause that?

I'm trying to track down a locking issue, and found via SHOW PROCESSLIST that when the queries in question are waiting for locks and timing out, there are no other queries active in the process list. ...
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2answers
241 views

mysql information schema database last used datetime

I have a lot of tables in my database, almost 1,000. Most of them I am not using now. Is there any way to know from the information schema tables when I have last used my tables?
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116 views

Windows crashes on doing sql dump [closed]

Windows simply crashes and opens the blue screen for dumping physical memory on trying to import sql dump. Blue screen error: IRQL_NOT_LESS_OR_EQUAL So far I have tried 4 methods: Through workbench ...
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220 views

mysql.sock missing

I started my MYSQL database this morning but failed. And I tried all means I can think of: chown -R mysql.mysql /var/lib/mysql chmod g+w /var/run/mysqld chgrp mysql /var/run/mysqld chmod -R 755 /var/...
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1answer
1k views

Multiple User Types - DB Design Advice

I'm developing a web application that will support user authentication with corresponding roles for each user. Also, my users can be of different types and have different fields associated with them. ...
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4answers
258 views

Better Indexing for MySQL?

Is it better to index each column individually with it's own key or to index multiple columns under the primary key? I've seen it done both ways in many different applications and I don't see a clear ...
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1answer
1k views

Slow insert with MySQL full-text index

I use a full-text index in a MySQL table, and each insert into this table takes about 3 seconds. It seems that MySQL rebuilds (a part) of the full text index after each insert/update. Is this right? ...
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2answers
1k views

Warnings: Why are statements with limit clause unsafe even if there isn't a limit?

I'm a bit irritated because of some warnings in mysql errorlog. Example 1: [Warning] Unsafe statement written to the binary log using statement format since BINLOG_FORMAT = STATEMENT. The statement ...
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2answers
4k views

Slave settings not working

I have this machine as slave. Below is the command I ran and stuck. I done the change on the config file and set the id=2 too. Anything else I am missing here? slave start; ERROR 1201 (HY000): Could ...
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820 views

MySQL: optimal configs / methods for ALTER of large MyISAM table to InnoDB (17gb+)

I have a large MySQL (5.1) MyISAM table (13gb table, 4GB indexes - 40mm+ records) I'm going to be converting this table to InnoDB in a production environment. The DB is on a cloud server with ...
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2answers
473 views

Where condition execution sequence in MySQL

I am using MySQL 5.0.88. I have a query like: select DISTINCT party.­id FROM party­ LEFT join party_­identifier AS pi ON pi.­party_­id = party.­id­ WHERE ­(pi.­source_­note=? AND (...
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2answers
113 views

How to evolve MySQL schema while maintaining integrity

As I understand it, when you run a MySQL DDL statement, it will often lock the table, and then unlock it. It will even unlock it even if you had manually locked it. Also, schema modifications cannot ...
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413 views

Setting up DRBD on an active MySQL server

When it comes to setting up DRBD and MySQL, is the following possible? Set up DRBD on an active MySQL server Set up DRBD with no downtime allowed
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3answers
3k views

mysql database restore takes long time

I am in the process of reinstalling a Ubuntu server to rhel6 server. I have a pretty huge database. When I checked the mysql data directory size, it was around 354 GB. However, I dumped the entire ...
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0answers
165 views

Significant difference between duration for querys in SHOW PROFILE and SHOW PROFILES?

I have use mysql profiler to optimize an opencart query which takes more than 10 seconds to executes. mysql> SHOW PROFILES; +----------+-------------+-----------------------------------------------...
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1answer
2k views

Screwed up MySQL init_connect

I executed an incorrect SQL command: SET GLOBAL init_connect='SET CHARACTER SET=utf-8'; Now, when I try and run a script that connects to this database, I get the following error: _mysql_exceptions....
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380 views

Missing rows in MyISAM tables with 10-20 billion records

I've got 2 tables with 10-20 billion records each. Currently these are in MyISAM (MySQL). They only require to be built and indexed once, after this only SELECT is used. They are currently ...
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1answer
456 views

Create a mysql slave database from master database

I have a mysql master database running. I want to have a slave database. So, I stopped the master mysql database and copied it to the slave machine. I had bin log enabled on master so even those files ...
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1answer
227 views

How to keep MySQL general_log after I restart my computer?

I use a statement set global general_log = 'ON' to enable the general_log on my computer. After I restart or shutdown it, I have to run the statement again. How can I config MySQL write general log ...
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1answer
981 views

MySQL FULLTEXT search not returning any results

I'm wondering why my fulltext search isn't returning any results. To me this seems pretty straightforward, but alas it's not working. I'm far from a DBA, but looking at the EXPLAINed query, I see ...
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1answer
2k views

How to set up triggers in MySQL for copying a field

I have an in-house application that I've put together, and I'm VERY new to SQL in general. I have a table that contains most of our data. Let's pretend it looks like this. Matrix |Name | ...
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1answer
158 views

How does the transactions interact if you set a different isolation level per connection?

I read that I can have different isolation levels per connection and in the server. The default isolation level is REPEATABLE-READ. So if I have a transaction that issues a SERIALIZED to the client ...
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1answer
196 views

Adding time to an event that runs on a weekly basis

I have this event that runs every Thursday CREATE EVENT le_drop_database ON SCHEDULE EVERY 1 WEEK STARTS CURRENT_DATE + INTERVAL 3 - WEEKDAY(CURRENT_DATE) DAY DO BEGIN drop database carbon; ...
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2answers
3k views

2013. Lost connection to MySQL server during query error

I have a table with close to 20 million rows. In phpMyAdmin, I attempt to add a new column: ALTER TABLE `myTable` ADD `newColumn` TINYINT( 1 ) UNSIGNED NOT NULL DEFAULT '0'; After about 60 secs (...
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1answer
415 views

MySQL auto_increment delivers different primary key in MyISAM and InnoDB

I have a table with auto incremental primary key. If I want to change a row and add new rows I got different primary keys depending on engine MyISAM and InnoDB. The original table is: pk.. ...
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2answers
859 views

Mysql master-master permission replication issue

I came to know it's safe to replicate mysql database to have the users and permissions replicated, from a post in ServerFault is-it-ok-to-replicate-mysql-db. I have setup master-master replication ...
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1answer
505 views

What storage engine should I use for this MySQL table?

I have a table where I store all the urls from my website, and I update them from time to time when a visitor enters. The primary key is the url itself varchar(255). I have set it to use InnoDB but ...
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2answers
1k views

How to break table into two without losing performance?

According to http://stackoverflow.com/a/174047/14731, splitting away infrequently-needed columns frees up the cache allowing faster retrieval of the commonly-used columns. I've got a table whose ...
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2answers
1k views

Mysql. Block/disconnect slow queries

I am experiencing issue. Someone 'attacked' my server: simply by searching the same phrase with multiple requests. As it is text search request and database indices are not used, the engine searches ...
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1answer
498 views

MySQL backing up MyISAM tables by copying the physical files - and automating the process

I have 2 databases with MyISAM tables running on a Windows 2008 Server. These databases are about 20GB in size with a few tables with millions of rows. My question regards backing them up on a weekly ...
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847 views

Why can I not start mysql server on ubuntu after change the innodb_flush_log_at_trx_commit value to be 2?

Why can I not start mysql server on ubuntu after change the innodb_flush_log_at_trx_commit value to be 2 ? updated to answer the 3 questions: mysql> show variables like 'version%'; +--------------...
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2answers
673 views

Should master and slave have same mysql version?

I have a master database running mysql 5.5.11, and I am planning to setup a new slave. I am planning to use the 5.5.30 as it is the latest version. For setting up new slave, I am copying files from ...
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1answer
45 views

Constraint for a unique column if other column has same value

I'm wondering if it's possible to have a column be unique for each value of another column in MySQL. What I'm wanting to have is the same functionality as what a GROUP BY would do. Here's the table: ...
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3answers
899 views

What happens when we take a timediff between timestamp and datetime

Say I have following table in mysql (5.5+): CREATE TABLE IF NOT EXISTS `test` ( `id` int(11) NOT NULL, `x_time` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP, `y_time`...
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1answer
3k views

MySQL dynamically optimize innodb tables without “file per table” setting

We are getting a “too many connections” error once a week the same time a mysql procedure runs. The procedure runs “optimize table” on hundreds of tables and takes nearly ten hours to finish, taking ...
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1answer
2k views

what could cause a mysql process to close (clean)

We are using mysql master-master (version 5.5.32) for an API manager called Layer7. The 2 hosts holding the instances are in the same ESX From time to time we have mysql doing a clean shutdown for ...
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2answers
2k views

MySQL silently replaces UTF chars with literal question marks

I'm experiencing a situation similar to this SO question i.e. I'm working with a legacy database which has UTF8 content in latin1 tables (pretty ugly I know). Now I'm getting new data from a new ...
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1answer
2k views

Error in login in with root user in new mysql server

I've installed a MySQL server in CentOS 6.2 machine +-------------------------+---------------------+ | Variable_name | Value | +-------------------------+---------------------...
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1answer
504 views

MySQL Shutdown on Windows

Folks, I am running MySQL on Windows8 for my personal (casual) use. I am trying to determine if there is a way to automatically and cleanly shutdown MySQL whenever I shutdown my Windows8 computer. ...
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94 views

Why binlog capture only postions

Please help me out, why master server records only position not statement. ### INSERT INTO `sanma`.`response` ### SET ### @1=743096223 ### @2=0 ### @3='IR' ### @4='UnderProcess' ### @5=2015-...
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1answer
418 views

Need ideas about OPTIMIZE TABLE

Looking at a database with 10 tables and fairly active at by-the-hour changes. On the first of each month, I purge some rows from 3 tables to remove outdated material and keep the size down. All of ...
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2answers
5k views

query to select data between todays date as well as tomorrows date time upto specific time

I have database "raj" with table "pagination" In table pagination have "id", "actualtime" and "created" field id - auto_increment name- varchar created- datetime I want to display all rows which is ...
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2answers
2k views

How to get rid of using temporary when using DISTINCT in MySQL?

When I do the following, I get Using where; Using index; Using temporary. How do I get rid of Using temporary? http://sqlfiddle.com/#!8/f61a2/3/0 CREATE TABLE `test` ( `a` varchar(45) NOT NULL, `...