InnoDB : MySQL's ACID-compliant Storage Engine

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inno_db_buffer_pool_size and key efficiency

I have the following metrics from mysql workbench After I have set innodb-buffer-pool-size to 6G, according to this answer's query on how to determine the recommended size. While the used buffer ...
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1answer
516 views

Corrupted InnoDB table, mysqlcheck and mysqldump crash server

I manage a Percona XtraDB Cluster that uses a network storage with a flapping connection. Periodically we experience a high iowait with crashes and remount of the fs in read-only. Replacing the ...
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1answer
60 views

InnoDB: SELECT COUNT(*) using primary key 25 times slower on Windows

MySql 5.6, InnoDB. I have a table with 8 million records. It has an integer primary key, and a unique index u1 CHAR(40). It also has a few small fields and a VARCHAR(1000). SELECT COUNT(*) FROM ...
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111 views

Missing statement information from 'LATEST DETECTED DEADLOCK' InnoDB status output

I'm learning how to interpret the LATEST DETECTED DEADLOCK section in the output of SHOW ENGINE INNODB STATUS, and had a question about the output. Some sample output of SHOW ENGINE INNODB STATUS ...
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2answers
85 views

How can I defragment tables in MySQL?

I have a database named COUNTY. COUNTY has a fragmented table GEO. I executed OPTIMIZE TABLE GEO against the GEO table, but this returned the error "Table does not support optimize, doing ...
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1answer
104 views

What is the optimum way to store, update, and analyze integer data for 100+ attributes?

I need to store the count of all individual characters (A-Z, a-z, 0-9, spaces, punctuation marks, all symbols...) that occur in different texts which will be frequently changing. I will need to ...
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3answers
1k views

Lock mysql table to prevent select and insert at the same time

I know this question has been asked earlier and I have also read the documentation. But I guess I'm stupid not understand. I have a code that inserts a row and the row should be unique in several ...
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1answer
1k views

MySQL UPDATE query stuck on “Sending Data” State

I am having difficulty getting an UPDATE query to successfully execute, due to the process getting stuck on "Sending Data" state. I feel this differs from similar questions about the "Sending Data" ...
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2answers
31 views

MySQL Drive Storage Allocation

In our production servers for SQL Server, we usually split our drives by Software, Logs, Data, and Backups. I've been assigned to help with a MySQL installation (On Windows Server) and I'm not as ...
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1answer
125 views

Restore MySQL Database with only .frm files

One of our servers (running Ubuntu 12.04) recently crashed during a power outage, and MySQL refused to start back up. After a lot of trial and error, I decided to completely reinstall it. Since I ...
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2answers
76 views

How do you achieve a physically sorted table file organization?

Do I just declare an index on a column in the schema like ? ALTER TABLE `table` ADD INDEX `index_name` (`colDate`) I want the table records to be physically sorted not just when doing an ORDER BY ...
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1answer
70 views

Optimize slow query

I have this query that takes over half an hour to run on our Linux MySQL db... SELECT ls.emailaddress , lse.subscriberid , lse.eventtype , count(lse.eventtype) as total FROM ...
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Identifying table causing runaway rollback in MySQL 5.5 (InnoDB / Windows)

I have a large database (180 GB), running under Windows, with a runaway rollback that starts running as soon as the database is started up. I have started the database with innodb_force_recovery=3 ...
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1answer
1k views

Mysql Optimization suggessions

I have an InnoDB database table with more than 2 million rows. I am running efficienty indexed queries to reduce server load, but site becomes slower day by day. I ran Mysqltuner.pl to identify any ...
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2answers
1k views

ERROR Error reading packet from server: Lost connection to MySQL server during query ( server_errno=2013)

We are facing the issue in replication that we are not getting any error in Show slave status\G output rather facing the following issue in Error Log File [ERROR] Error reading packet from server: ...
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3answers
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Very slow Insert and update on 20 core 250 Gb RAM dedicated MYSQL 5.5 server on Ubuntu [closed]

Most of the data is in tbl_user_ads. Its a huge table. Many concurrent processes (over 1000) try to select, insert or update this table. The CPU utilization is just around 2%. As I increase the ...
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1answer
67 views

Mysql stop working woocommerce

I have a WooCommerce website hosted on an Amazon EC2 centOS server with 4GB RAM and 4GB swap. My problem is that sometimes MySQL stops working due to failure to allocate memory and also the website ...
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3answers
3k views

Optimal Number of MySQL InnoDB Buffer Pool Instances

Server Characteristics Total system RAM: 8GB (running MySQL + other stuff than MySQL on it i.e. not dedicated to MySQL) Number of CPU Cores: 6 I have data in the db amounting to about 2GB I have ...
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1answer
71 views

MySQL Query causing high CPU and taking forever to execute

this below query takes a long time to execute in excess of 120 seconds, upon checking the explain plan it seems to be using using where, using temporary; using filesort. Since the application is a ...
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1answer
54 views

when do i usually optimize an innodb table?

I have a table that's always used 24/7. There is always a stream of update and/or insert of 10-20 rows per 30 to 60 seconds. As stated on the MYSQL documentation: "After doing substantial insert, ...
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112 views

How to configure correctly Mysql heavy used server to prevent it from write IO huge spikes?

I have mysql 5.6 server which handles thousands of users online. All tables are Innodb. The problem is, that once or twice a day it writes huge amount of data to disk, or it slows down a lot. Than ...
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1answer
70 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
235 views

Two updates cause a deadlock

I have a mysql queue with the following sheme: CREATE TABLE IF NOT EXISTS `media` ( `mid` int(11) NOT NULL AUTO_INCREMENT, `order_type` int(11) NOT NULL, `media_id` varchar(50) COLLATE ...
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116 views

Discard tablespace of temporary innodb table in MySQL

I have following problem, i need to discard tablespace of temporary table(file is present, i want to delete this file too) or somehow completely remove this table. This table can't be shown with ...
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4answers
3k views

Calculate row size and max row size for a table

Problem: Is there any way of calculating number of bytes occupied by the table creation, i know that you can get some information from information_schema.tables but that information is not accurate ...
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690 views

MariaDB/InnoDB: Temp file write failure

When attempting to alter a table to enable compression by modifying the KEY_BLOCK_SIZE I received the error: ERROR 1296 (HY000): Got error 64 'Temp file write failure' from InnoDB The command ...
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2answers
49 views

What storage engine do I need - Mysql?

I have designed a database and came to the point of actually deciding which storage engine is better for my case. I estimate that during the first few years I would have around 100,000 - 500,000 ...
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Update queries randomly slow on INNODB Mysql

I have been struggling with a slow update query. Have already tried using indexes and other query optimization techniques. I have been using MYSQL database with INNODB engine. The issue is that, ...
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1answer
2k views

InnoDB: Error: Table “mysql”.“innodb_table_stats” not found

I've got the same error, although I'm running galera cluster with 3 nodes. I tried following the instructions from InnoDB: Error: Table "mysql"."innodb_table_stats" not found after ...
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0answers
73 views

Percona: Innobackupex failing when taking incremental backup

I have been trying to take incremental backup as below and its getting error all the time. Innobackupex 2.1.8 Linux x86_64 Mysql 5.5.45 Step1: innobackupex -uxxx --stream=xbstream datadir > ...
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1answer
52 views

How can i write a stored procedure which will perform a calculation and store the result in a table?

I have two tables: CREATE TABLE `siteArea` ( `length` decimal(6,2) NOT NULL, `breadth` decimal(6,2) NOT NULL, `Area` decimal(6,2) NOT NULL ) ENGINE=InnoDB DEFAULT CHARSET=latin1; CREATE TABLE ...
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Does MySQL InnoDB compression combined with Windows compression save more space?

We have a very large MySQL InnoDB database, compressed using the following syntax at the end of the table declaration: ENGINE=InnoDB ROW_FORMAT=COMPRESSED KEY_BLOCK_SIZE=4 We also have windows ...
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4answers
320 views

What architecture is best to store a large 3 dimensional array in MySQL?

I am looking to create a large 3 dimensional database in MySQL. The structure will basically be a standard MySQL table, with a time component / dimension added. See the following analogy: { x, y, ...
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1answer
127 views

query optimization of a left join

I have the following query written into the slow log (mysql-slow.log). I don't have much idea how to optimize this query. I already have indexes for: mode, f.user_id... etc but doesn't seem to ...
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32 views

FullText search using only some of columns in index

I have a full text index on (name,category,description) as shown below. mysql> show create table phppos_items; ...
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1answer
99 views

Unable to load mysql dump file

I recently had to deal with migrating some servers over (rather was forced to by the hosting company) and we took too long to migrate our data so they did it for us. Unfortunately they just copied ...
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3answers
270 views

Convert MyISAM to InnoDB

What are the considerations needed when converting myisam to innodb. I have a table around 80 GB with engine myisam. I would like to convert into innodb. What are the considerations needed to ...
2
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1answer
83 views

SQLyog and MariaDB engine

I am quite new in MariaDB and I use SQLyog Community Edition as the frontend GUI. Whenever I create a new table, on the Engine dropdown, there is no XtraDB option. Is there any additional steps I am ...
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2answers
828 views

tmp_table_size with mostly InnoDB tables

I use MySQL version 5.6.25-0ubuntu0.15.04.1 on 64-bit Ubuntu 15.04. I have 2GB RAM and the disk is SSD (so, in my mind, writing to disk isn't that costly). I currently have databases for just two ...
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1answer
157 views

Benefits of using prepared statements in stored procedures?

Except from helping avoid SQL injection, what are the benefits - if any - of using prepared statements inside a store procedure (assume query is only executed once in the procedure)? Does the engine ...
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1answer
61 views

Too many TEXT fields leads to record too big

I have a table with multiple 9 TEXT columns, each containing JSON data. I usually UPDATE all the columns at once. I can't seem to add a 10th TEXT column. The table is InnoDB. What can I do?
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2answers
55 views

MySQL InnoDB data restore using 3 files

I am able to restore MySQL table data along with structure with indexes (InnoDB Engine) using 3 files. MyTable.frm, MyTable.ibd and ibdata1. Can any body confirm, will these 3 files suffice to ...
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1answer
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Mysql: How does a rollback operation be performed inside InnoDB

I would like to hear in simple words Please answer me in simple words to the question on the below scenario. ============== Engine: Innodb Trx1 : started and a DML is executed at 10:00 AM and rolled ...
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2answers
1k views

HeidiSQL: Import CSV

A few lines of my CSV: "id","date","date_","pow","ene","reac" "ES0134000563024539AM0F","2013-05-02","2013-06-05","62","43","43" "ES0134000573024539AM0F","2013-05-02","2013-06-05","62","43","43" ...
2
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1answer
634 views

MySQL server won't start with foreign_key_checks=0

I'm running Ubuntu with MySQL version 5.5.44 mysqld Ver 5.5.44-0ubuntu0.14.10.1 for debian-linux-gnu on x86_64 ((Ubuntu)) I have a DB with foreign keys. I would like to have the foreign key ...
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2answers
31 views

Should the Redo log on a production MySQL server be configured to another location?

Concerning the innoDB storage engine, should the innodb_log_group_home_dir option (The directory path to the InnoDB log files) be configured to another disk, other than the default directory, in order ...
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160 views

Tuning MySQL with InnoDB engine for my application

I've read through a lot of answers, and I realize this is mostly application specific, so I wanted to give some background as to what I'm doing with the database and hopefully get some tips on tuning ...
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1answer
43 views

Is my import still committing?

I'm importing around 9 million rows into my MySQL DB using the following command: SET autocommit=0; SOURCE my_import.sql; COMMIT; The command line is no longer outputting lines of Query OK, X rows ...
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0answers
73 views

MariaDB error on alter table - table removed - constraint name is blocked

Today, we experienced a strange behavior in 5.5.41-MariaDB (InnoDB): An ALTER TABLE (add constraint) statement failed with error (mysql server has gone away after that). Then the database table ...
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2answers
170 views

Sudden MySQL freeze, with spike in dirty pages, but without obvious write queries

I'm systematically (1/2 times per day) experiencing a freeze in the DB server. Suddenly, all the COMMITs get stuck in 'init' state; they pile up (up to 20/30), an almost no other queries are executed ...