InnoDB : MySQL's ACID-compliant Storage Engine

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819 views

Making sense of INNODB buffer pool stats

After having read this page in the mysql documentation, I tried to make sense of our current InnoDB usage. Currently, we allocate 6GB of RAM for the buffer pool. Our database size is about the same. ...
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1answer
643 views

Delete data from huge InnoDB table from MySQL Master and Slaves

We have some huge tables in MySQL database, We have already archived/deleted data older than 2012 in 2013, Now we need to archive/delete data older than 2013 means we need to archive data for year ...
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1answer
251 views

How to use LOW_PRIORITY for heavy queries?

I have scheduled heavy UPDATE queries at administrator level, and since they are heavy UPDATEs with multiple JOINs, consume a huge amount of resources. I do not want them to stop end users from ...
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1answer
100 views

Is ANALYZE useful immediately after creating an InnoDB index?

Let's create a new index on an existing table: CREATE INDEX `IDX_some_index` ON `some_table` (`a_column`, `another_column`); Is this useful? ANALYZE TABLE `some_table`; Can anyone point to ...
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2answers
101 views

How to interpret the information spit out by innochecksum?

MySQL is using up a lot of the disk space. Running du -sh on the data directory shows a humongous ibdata1 file (around 1.7 terabytes). I found a very helpful article online and ran a modified version ...
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2answers
91 views

Mysql Windows Issues

I've been having allot of issues with my mysql databases on Windows dying on me. About once a week or so it will refuse to work and I'll spend all night poking at it & a few computer restarts ...
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2answers
98 views

I can't get an import to go past 1.1gig

I can't get an import to go past 1.1gig. I have a large 4gig InnoDB table/database I would like to get on my "tried and true" box. Current config on this box I want to work with = Dell PowerEdge ...
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1answer
160 views

Where does mysql write temporary tables?

MySQL 5.1.x | Windows Server 2008 Data Directory is on a different partition. I have an innodb database (innodb_file_per_table is set) that I'm trying to optimize and I don't appear to have enough ...
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1answer
260 views

Why “.my.cnf” file is empty?

I want to edit some of InnoDB variables ,I go to the .my.cnf which is located in home/.my.cnf I found the file just empty. And when I check SHOW VARIABLES in MySQL it gives me all the variables and ...
5
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1answer
1k views

Slow InnoDB INSERT/UPDATE/DELETE

Background A couple of weeks ago all of my INSERT's/UPDATE's/DELETE's became overall slow (not SELECT's). Before that, everything was normal (mysql statements executed in <0,01 seconds). Now a ...
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0answers
87 views

What are the steps to change tables engines from MyISAM to InnoDB?

I have a Datebase with 10MB size . The Tables' engines were MyISAM (table-lock level). So I deiced to change them to InnoDB (row-lock level). I used the sql query for each table : ALTER TABLE t ...
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2answers
222 views

MySQL - INSERT … SELECT .. FROM .. - Single transaction or transaction per row?

Question: I am currently working on a data migration. I need to migrate 2.5 million rows from one InnoDB table to another InnoDB table (with a different setup). I am using the following syntax to do ...
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1answer
40 views

is it possible to set engine for database (not the tables)?

There are about 250 tables in my database and they all have InnoDB engine. I imported them into a server. They were imported and were displayed in the tree structure of phpmyadmin (under the ...
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1answer
105 views

Need to optimize simple SELECT query for InnoDB table with 2million rows

I'd like to make this query the fastest possible, since it's called really often. SELECT login_events.id FROM login_events WHERE ( DATE(created_at) >= DATE(CURRENT_DATE) AND person_id = 1 ) ...
3
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1answer
1k views

How to optimize InnoDB tables in MySQL

I’ve been researching how to optimize only fragmented tables in MySQL and reviewed this post on optimizing tables. It basically performs a query against the information_schema database for any table ...
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2answers
521 views

InnoDB + TokuDB fills up RAM then start swapping

I'm trying to face difficulties with my database lately. I've migrated from MyISAM to TokuDB v7.0.4 and InnoDB. I'm using MariaDB - 5.5.34-MariaDB-1~wheezy-log. My problem is that MariaDB fills up RAM ...
3
votes
1answer
324 views

Mysql database slow responding to connects when having only few concurrent connections

We have a database setup with in master/slave. It runs innodb and its on a 8 core with 32gb. When i run "ab" to do a load test on a website (4 frontend webservers) which does the query's with 10 ...
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0answers
33 views

How do I save file data to my newly mounted SSD in mysql innodb continually?

I've recently mounted a new SSD since my disk's empty space had less than 10% (mysql unbuntu linux) and this is what I did in my.cnf file to save data to my new path: innodb_buffer_pool_size=2G ...
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1answer
191 views

MySQL with high CPU and memory usage

here we have a VPS with 3.2GHz quadcore processor with 2GB of RAM and 4GB of SWAP which need to work with a high intensive legacy system (read: bad coded). The main problem is that the CPU (~80 - ...
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1answer
225 views

Data lost in MySQL InnoDB after crash

I found a 6-days rollback in a MySQL 5.6 community edition server installation. It seems that some logs were lost, and I cannot understand why. 2013-12-22 20:38:54 380 [Note] Plugin 'FEDERATED' is ...
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1answer
1k views

Query State hangs on sending data

For some reason, the query state hangs on "Sending Data" (using show processlist;) and I have no idea why. This is the table creating script: CREATE TABLE IF NOT EXISTS `esp_game` ( `gameID` ...
3
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2answers
98 views

optimal size of innodb buffer pool

I read a lot of optimal number of innodb_buffer_pool_size and people say it must be larger with 10% than the innodb tables size, what is 60M. Accordyngly this the optimal size of the buffer is about ...
0
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1answer
193 views

What happens when the index size of my Mysql instance exceeds the innodb_buffer_pool_size?

I am using Amazon's RDS db.m1.small. innodb_buffer_pool_size is set to 1125.00 MB. Current index size is 1110.00 MB and growing slowly but steadily. I do not need more hard drive space. I want ...
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1answer
69 views

Cant unlock file (Errcode: 11) on my new tables

I get the following error on my MySQL database Cant unlock file (Errcode: 11) But this error only happens when I try to access my new table I created below has two tables 1st I created recently and ...
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2answers
59 views

MySQL using swap during conversion to InnoDB

I'm trying to convert some MyISAM tables in my database to InnoDB (MySQL 5.1). The server has quite a bit of memory (96G), and the tables that are giving me problems can be on the order of 50 millions ...
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2answers
422 views

Setting default CHARSET and DB Engine

I recently updated my server's database system from MySQL to MariaDB. After update, everything works well. But, when I went to phpMyAdmin, the default charset and types are changed: At the end of ...
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0answers
156 views

InnoDB: error: space object of table

131212 10:35:18 InnoDB: error: space object of table 'main/wp_m_membership_levels', InnoDB: space id 119 did not exist in memory. Retrying an open. 131212 10:35:18 InnoDB: error: space object of ...
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0answers
110 views

Making cloned copies of a innoDB mySQL database

I'm trying to find a better way to clone innodb mysql database then using regular import. We use an innoDB mySQL database in production. A backup is created daily from production. Currently each ...
2
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3answers
3k views

Purge old records from mysql ibdata1 file

Is it possible to purge old records from an ibdata1 file without taking down the database attached to it? Records that have been deleted from the database are still present when I scan ibdata1 for ...
2
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2answers
96 views

How to store logs correctly?

(This is somewhat a follow up on my last question) I am using MySQL 5.5 with innodb. My Log table consists of two columns. One for user number, and the other for a string consisting of IP, request ...
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1answer
167 views

Mysql HY000 the table table_name is full when adding new column

I can't add a new column innodb table which size's 16MB. when I try to add, mysql says HY000 the table table_name is full. I changed my tmp_table_size and heap_size but mysql still says same error. ...
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1answer
830 views

MySQL SELECT query hangs - Opening Tables INNODB

On my server I have 6 MySQL databases. They all power Wordpress websites. For some reason, 2 of these databases are not accessible. To my knowledge they use INNODB, but I can't confirm it as even ...
4
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1answer
4k views

InnoDB: Error: Table “mysql”.“innodb_table_stats” not found after upgrade to mysql 5.6

I upgraded to mysql 5.6 from 5.5, and now my logs are littered with such messages on startup I found a possible solution here, but it does not seem official. ...
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0answers
433 views

Analyzing MySQL crash due to corrupt InnoDB page. Failed page checksum

Lately we have been pestered by infrequent sporadic database crashes on one of our MySQL instances. Each time it is due to a failed page checksum. It happens on a specific database but spans multiple ...
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0answers
390 views

mysql innodb corrupt database - mysqld won't start

I am unable to start mysqld. I tried innodb_force_recovery = 4 in /etc/my.cnf Here is the relevant lines in /var/log/mysqld.log which suggest that recovery fails and I probably need to recover from ...
3
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2answers
88 views

Is it suitable innodb_buffer_pool_size for MySQL Master-Slave

I am wondering how to decide the value of innodb_buffer_pool_size for my Master-Slave style database. I have a set of MySQL, 1 x master + 1 x slave. As I know that the innodb_buffer_pool_size is ...
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0answers
45 views

How to get rid of the table lock in MySQL

I have a database for my website the website have a betting game(using insert and update queries) and the other pages of the website are using (select, insert and update queries). When a user make a ...
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0answers
233 views

InnoDB: Could not find a valid tablespace file for 'mydb/mytable'

I'm getting the following error in mysql server 5.6 upon startup. the below mentioned table disappeared, but both .ibd and .frm file does exist, has the right permissions and is owned by mysql user ...
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1answer
530 views

Timeout on ALTER TABLE table ENGINE=InnoDB - is table still converted?

I'm converting tables in an old MYISAM database to InnoDB to increase robustness in case of power loss etc. I'm using Mysql 5.5.x Before doing the production system, I am doing a trial run on a copy ...
0
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1answer
105 views

Can MySQL use an index to calculate SUM?

The following query is run in a MySQL database (all InnoDB tables, Percona 5.5), and is slow for some parameter values (i.e. for some large customers). It returns the total size of all files uploaded ...
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3answers
501 views

Converting live MyISAM table to InnoDB

I have a table that tracks web traffic. The table is constantly written and read from. Since table is pretty big in size I have to make sure the application will not "freeze" in the process of ...
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0answers
146 views

innodb .frm files move from one server to another fails

I have a weird issue with an InnoDB table restore. Can you please help me to recover the InnoDB database? In MyISAM it works. we have the database(/mnt/OLD/var/lib/mysql/ims) with 300 Innodb ...
0
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1answer
36 views

In MySQL, when using InnoDB, what happens to the way data is laid out on disk when the primary key is dropped?

In MySQL, when using InnoDB, what happens to the way data is laid out on disk when the primary key is dropped? Also, what happens when a new primary key is added?
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1answer
66 views

DROP TABLE on a huge InnoDB table

I have an innodb table with over 140 million rows taking 26GB. I would like to drop this table however this is taking way too long, probably days. How can I speed up this query? processor: Intel® ...
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1answer
62 views

When is the index actually created?

I have noticed that even on huge tables with millions of records when I do a CREATE INDEX the index is created immediately (I get the console back in nsecs). Why is this? Doesn't it create the B-Tree ...
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2answers
76 views

Where/how does innodb store tables in files?

I read somewhere that InnoDB can store all the tables in a single file or in separate files. Is this a configuration option? What is the default setting? A file for all tables or a file per table? ...
0
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1answer
334 views

TCP sockets bottleneck with InnoDB/Debian?

We have a big mysql performance issue on a production environment with 18 "front" servers sending mysql queries to a unique mysql server. We are using Redis on each front server for a number of ...
0
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1answer
217 views

How to copy a table in a production server without WRITE lock and without writing to a file

I'm trying to copy a table in a production table. When I'm performing on InnoDB tables: INSERT INTO new_table (SELECT * FROM table) I have a write lock on table. Is it possible to avoid this lock? ...
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1answer
145 views

How to recover from two queries stuck in kill state causing all the database to not respond? [closed]

During a INSERT INTO new_table (f1, f2, ..., fn) (SELECT f1, f2, ..., fn FROM table) I clicked the new_table in php-myadmin which ran a simple SELECT * FROM new_table LIMIT 0, 30 which ofcourse ...
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0answers
51 views

Help with Mysql with 100K+ Table

Hi im trying to develop a database design in which its gonna have 100K+ tables residing in it. My major concern here is will Mysql be able to hold that much amount of tables with no performance ...