InnoDB is the MySQL ACID-compliant storage engine.
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10 views
Will Partitions and Indexes on the same table help in performace of Inserts and Selects?
I have a table containing the list of visitors and this table has the following information.
Visitor Browser Information
Visitor Location Information
Visitor Time Information
No of Visits
I have a ...
1
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2answers
18 views
Innodb table is taking randomly long time to execute the insert query and in show processlist showing as queryend/updating
Innodb table is taking randomly long time to execute the insert query and in show processlist showing as queryend/updating and it happens for the similar queries for the same table and the queries got ...
0
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2answers
64 views
Cannot Utilize Maximum CPU and Memory Usage for MySQL
Good day.
I know this may be a duplicate of other questions however I have applied all the suggestions in many of the threads, but I remain with the same problem.
I have a single stored procedure ...
0
votes
1answer
28 views
How can Innodb ibdata1 file grows by 5X even with innodb_file_per_table set?
I have innodb_file_per_table set and just today my ibdata1 file jumped from 59M to 323M after I made several changes to an 800M table to reduce it to about 600M. That particular table's .ibd file was ...
0
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1answer
137 views
consequences of using “innodb_flush_method = O_DIRECT” without having a battery backed write cache? or on a KVM guest?
Mysql 5.5.29 Innodb- 128GB Ram - 32 cores - Raid 10 SSD.
Our server which is a dedicated KVM guest on a 'baremetal' is hosting our heavy read-write DB server.
Everything is file-per-table. ...
0
votes
2answers
40 views
Is there slowdown inserting into an InnoDB table that has no index set?
I have an old application with lots of InnoDB tables, that have no indexes at all, not even a primary ID or such.
Those tables only contain a few thousand rows.
Would it be faster to INSERT data ...
4
votes
2answers
8k views
MySQL: how to restore table stored in a .frm and a .ibd file?
I have previously saved a copy of /var/lib/mysql/ddms directory ("ddms" is the schema name). Now I installed a new MySQL on a freshly installed Ubuntu 10.04.3 LTS by running apt-get install ...
3
votes
1answer
858 views
MySQL: Lock wait timeout exceeded
I have a developer that has been trying to alter a large table (~60M rows). Via LiquidBase/JDBC they're running
ALTER TABLE foo DROP FOREIGN KEY fk_foo_1;
Today while it was running I checked in ...
1
vote
1answer
10 views
Percona xtrabackup Prepare Fails
I made a backup and according to Percona it completed successfully. Now I'm trying to prepare it and having the following issue:
./xtrabackup_55 --defaults-file="/etc/my.cnf" ...
4
votes
2answers
81 views
Partitioning and freeing disk space
I am running MySql innodb with innodb_file_per_table.
As a daily script, I would like to create a new partition for a set of tables, as well as delete yesterday's partitions. What command would need ...
0
votes
1answer
84 views
MySQL database drop insanely slow
I just installed MySQL 5.0.45-log Source distribution on my Debian 6.0.6 server.
I installed it under my user home directory like I'm used to doing.
But this time the queries are extremely slow to ...
1
vote
1answer
43 views
Which one to use? InnoDB Replication or MySQL Cluster?
I am building a url shortener and I use InnoDB as the storage engine for link data. I will start with a single VPS containing both application instance and MySQL database instance on the same Virtual ...
0
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0answers
10 views
Would Mongo's ObjectID work well in InnoDB's clustered index?
Mongo's ObjectID is defined like this:
ObjectId is a 12-byte BSON type, constructed using:
a 4-byte value representing the seconds since the Unix epoch,
a 3-byte machine identifier,
...
1
vote
2answers
31 views
Is it better to use AUTOCOMMIT = 0
Is it better to use (for perfomance tuning) AUTOCOMMIT = 0 before bulk inserts of data in MySQL, if the insert query looks like
INSERT INTO SomeTable (column1, column2) VALUES ...
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2answers
40 views
TokuDB/InnoDB Question
What's the faster scheme for insert data to TokuDB or InnoDB Engine? Over 200 Insert per second.
That's okay to answer of one engine.
TABLE: `game`
`gameId` bigint 20 (PK)
`gameMapId` int 4
...
2
votes
1answer
263 views
Select * from statement execute very slowly, innodb io read speed is low
I have a very simple query " select * from ap_statistic " running in my servers. the servers have the same hardware and software configuration (CPU 8 core, mem :32G, OS: redhat 5.5, mysql version: ...
1
vote
1answer
38 views
How can I make a select statement get blocked?
Hello I am trying to intentionally make a SQL select statement get blocked by another simple SQL delete or update statement, for the purpose of learning. I prefer only InnoDB tables.
To prepare the ...
1
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0answers
25 views
Storing history of full/partial tables
I'm building a web-application with Django and MySQL (InnoDB) and am currently pondering over how to manage historical changes on various tables.
I wonder if it's efficient to store a lot of rows ...
1
vote
1answer
65 views
Why does that query cause lock wait timeouts?
From time to time, I find a lot of these errors in my PHP error log:
MYSQL.1213: Deadlock found when trying to get lock; try restarting transactionSQL
The problem persists for about 2 or 3 minutes. ...
22
votes
3answers
22k views
How to safely change MySQL innodb variable 'innodb_log_file_size'?
So I'm fairly new to tuning InnoDB. I'm slowly changing tables (where necessary) from MyIsam to InnoDB. I've got about 100MB in innodb, so I increased the innodb_buffer_pool_size variable to 128MB:
...
1
vote
1answer
34 views
Allocating 8GB memory to MySQL on a 64bit system
Specs -
MySQL 5.0.x , Redhat 5.9 , Physical memory - 16GB
I am trying to set innodb buffer pool size to 8GB (innodb_buffer_pool_size=8G). When i do, and start mysql, i get following error -
...
0
votes
1answer
49 views
Large INSERTs performance optimization
I have 15 Amazon AWS EC2 t1.micro instances which simultaneously populate Amazon RDS MySQL d2.m2.xlarge database with data using large INSERTs (40000 rows in query).
The queries are send ...
1
vote
1answer
120 views
What is causing the Periodic High Disk IO writes on MySQL Apache Server [closed]
I've already read all the posts related to this subject but couldn't find any answers. Here are my settings. Server has 4GB of RAM but top shows only 2.2GB are used. I've set the ...
0
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0answers
39 views
How much RAM for a large database on a dedicated MySQL InnoDB server?
Hereunder my hardware config:
CPU: 1x Intel Xeon X3470 Quad core @ 2.93GHz
RAM: 4x 8GB DDR3
Disks: 2 x SATA 320GB for the system & 4 x SAS 300GB for the DB
I've upgraded from 12Gb to 32Gb and ...
1
vote
2answers
55 views
SHOW TABLE STATUS very slow on InnoDB
Recently we've been migrating from MyISAM to InnoDB and I understand that MyISAM uses meta information against each table to track information and such - however, the database is about 1.8gb with 1+ ...
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votes
0answers
5 views
InnoDB Tablespace critical error in great need of a fix
Link to screenshot : http://www.nouvellesduquartier.com/i/1/p/Munin_%20Critical_MySql_InnoDB_.JPG
Question: Could the error shown on the screenshot be the reason why my site is very slow?
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2answers
36 views
InnoDB Tablespace critical error in great need of a fix
Link to screenshot :
http://www.nouvellesduquartier.com/i/1/p/Munin_%20Critical_MySql_InnoDB_.JPG
(The value reported is outside the allowed range - Byte free, free, gauge, warn, critic)
Question: ...
3
votes
3answers
3k views
How to use insert delay with the InnoDB engine and use less connection for insert statements?
I'm working on an application which involves a lot of database writes, approximately ~70% inserts and 30% reads. This ratio would also include updates which I consider to be one read and one write. ...
0
votes
2answers
128 views
MySQL backup InnoDB
I have a VoIP server running 24x7. At low peak hour at lease 150+ users are connected. My server has MySQL running with InnoDB engine on Windows 2008 platform. I like to take at least 2 times full ...
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2answers
289 views
How to increase fast backup and restore of 500GB database using mysqldump?
There is a database A size of 500GB. Tables in database A contains both MyISAM and INNODB tables. MyISAM tables are master tables and Innodb tables are main transaction tables.
Backup and restore ...
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1answer
94 views
How to check growth of database in mysql?
I want to know is there any method to check the growth of database on file
EXAMPLES
Database A contains all tables in INNODB storage engine
Database B contains all tables in MyISAM storage engine
...
0
votes
1answer
20 views
InnoDB Failure of some kind
I have MySQL 5.5 installed. I tried to install Joolma but it failed. I went into their sql and replace EGNINE=InnoDB with MyISAM and the install worked.
InnoDB is listed under SHOW ENGINES;
Any idea ...
0
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0answers
476 views
1286 - Unknown storage engine 'InnoDB'
I am trying to use roundcube and it recently just broke. I don't know if this is due to a MySQL update that happened recently or not but in phpMyAdmin I get the following error if I try and view a ...
1
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1answer
42 views
Ubnutu/MySQL - Error “Unable to locate package innotop”
I am using Ubuntu 12.04.2 LTS, with MySQL 5.5.29.
Im trying to install innotop for database monitoring, but getting an error "Unable to locate package innotop"
root@server1:~# apt-get install ...
2
votes
1answer
166 views
How much data is needed to show MySQL Cluster's performance scaling vs. InnoDB
I am evaluating MySQL Cluster as a possible replacement for an InnoDB schema. So far, I have tested it with 10s of MB of data, and found MySQL Cluster slower than InnoDB; however, I have been told ...
0
votes
1answer
119 views
How I prevent deadlock occurrence in my application?
I am developing an LMS application in PHP framework(Codeigniter 2.1.0). I am using MySQL database.
All the tables in the database have innodb engine. I also created indexes on each tables.
Now I am ...
1
vote
2answers
194 views
MySQL-5.5 InnoDB memory issue
Version in use is mysql-5.5.24.
In the Enterprise version of MySQL innodb_buffer_pool space is released after a while, however this does not appear to be happening in the community version.
I am ...
1
vote
1answer
64 views
Configuring MySQL (my.cnf) for MyISAM and InnoDB
I want to convert some (not all) the MyISAM tables to InnoDB.
Here is my current my.cnf: pastebin.com/FW8YXtLQ
What would be the best configuration? (need to add InnoDB settings, byecause there are ...
1
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2answers
356 views
Mysql innoDB write operations are extremely slow
I'm having serious performance problems with MySQL and the InnoDB engine. Even the simplest table makes writing operations (creating the table, inserting, updating and deleting) horribly slow, as you ...
0
votes
1answer
179 views
What is the actual difference between innodb_autoinc_lock_mode 0,1,2
I would like to understand the differences between innodb_autoinc_lock_mode options 0,1 and 2 when parallel load data infiles are given.
I see in "0" option, it locks the entire table and does the ...
1
vote
1answer
182 views
Queries getting stuck on very simple COUNT queries
process list:
| 16004 | metrics | xxx:64616 | metrics | Query | 29064 | Sending data | SELECT COUNT(*) FROM Plugin where LastUpdated >= '1356856200' | ...
0
votes
1answer
68 views
Lock wait time out exceed restart transaction
I had got error on the lock wait time out so below I got 3 samples taken. One I took before the increase innodb_lock_wait_timeout to 120. So is there anything else I must tweak based on the logs ...
1
vote
1answer
173 views
increasing mysql table open cache?
I often read that it is best to increase this variable slowly. Can someone explain why? My status indicates that I should increase it... What is best practice / "slowly"?
Thanks!
1
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1answer
91 views
select count(*) in mysql 5.5 innodb— rewrite advice?
I need advice on how to rewrite a select count(*) query for innodb tables mysql 5.5. in new environment its very slow...
select count(*)
from mails3
join questions using (question_id)
where ...
3
votes
1answer
57 views
How can I get this query to use it's index?
Queries matching this query below shows up in the slow log (with different contentVersionId & modifiedDateTime).
As I don't really know what I'm doing I tried adding indexes to all columns in ...
2
votes
4answers
234 views
TokuDB not much faster than MySQL
I have converted a MySQL database with 80.000.000 rows to TokuDB.
Now when I run:
select count(id) from xxx where active=1
it takes 90% of the time of the normal MySQL request.
What do I have to ...
2
votes
2answers
53 views
Is it okay to use rsync on InnoDB database if the MySQL server is shutdown?
Is it okay to use rsync on InnoDB database if the MySQL server is shutdown ?
For example :
/etc/init.d/mysql stop
rsync -av /home/mysql/mydb/ root@newserver.com:/home/mysql
1
vote
2answers
117 views
MySQL information_schema doesn't update
I have a database, say abc, in mysql server. It has only one table named test. test uses innodb engine and I've set innodb_file_per_table to true.
After I run the query delete from abc.test, I want ...
1
vote
1answer
38 views
Table corruption: How to perform Innodb Checksum checks in MySQL 5.5 for Windows?
Having a corrupted Mysql 5.5.31 (Windows) database, my question relates to the the top solution provided in How do you identify InnoDB table corruption? , more precisely to the following script that ...
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0answers
41 views
is it good to use combined primary key for MySQL InnoDB clustered index?
I'm trying to build a aggregated reader website of multiple forums.
Because most queries are likely to be within same time periods for written_time column,
I'm thinking about taking advantage of ...
