InnoDB : MySQL's ACID-compliant Storage Engine

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2
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1answer
6k views

MySQL: Error reading communication packets

I get this warning in mysql, [Warning] Aborted connection 21 to db: 'MyDB' user: 'MyUser' host: 'localhost' (Got an error reading communication packets) I have been through few topics in google ...
1
vote
1answer
263 views

Innodb issue is preventing MySQL from starting [closed]

For some reason mysqld refused to start after I rebooted my server. Now when I try to start it I will get the following error: [root@vps1 ~]# service mysqld restart ERROR! MySQL server PID file ...
0
votes
2answers
113 views

Do I need to reindex my table in mysql after delete?

I have a table in mysql with a lot of INSERT and SELECT at every second. And there is a bulk delete of some older data once in a day. Do I need to reindex the table after delete? I want to increase ...
1
vote
1answer
51 views

MySQL InnoDB + high table creation-destruction rate

We are transferring a microsoft SQL based website (+app + plugins) structure to MySQL. The website has a high "Content + Comments + Activity Tracking" behaviour. Mainly because of the activity ...
0
votes
1answer
658 views

ib_logfile0 and ib_logfile1 got deleted

After restoring from a percona-xtrabackup without a preparation step, ib_logfile0 and ib_logfile1 were not present in the restore data. Therefor during startup the following message is observed: ...
0
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0answers
67 views

mysql uses a lot of virtual memory

I've a mysql server with a lot of small size innodb databases (each db also contains a lot of small tables) & 6GB of RAM dedicated to mysql server. Recently I've increased my ...
1
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0answers
42 views

Can't seem to optimize joined select query

Can't seem to figure this one out. Query is taking upwards of 7-8 seconds which is just not acceptable and seems as though it will get worse as the table(s) get larger. Without going into a ton of ...
0
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0answers
175 views

MySQL Inno DB Crash

This is the log of the crash. Basically every time I run a query it looses connection an crash. 2014-11-03 19:46:42 58021 [Note] Event Scheduler: Loaded 0 events 2014-11-03 19:46:42 58021 [Note] ...
0
votes
1answer
50 views

moving binary database folder is causing issues with innodb tables

so I have a mix of myisam and innodb tables on a database. (its a pretty big db 30gb) I copied the folder of the database from one server to the next /var/lib/mysql/databasename well the myisam tables ...
1
vote
1answer
2k views

How to recover the innodb when mysql data dir moved from one system to another system?

I have transfer the mysql data dir from one linux box to another box. When i start the mysql server. I can find that the innodb based DB are corrupted. So, may i know how to recover the corrupted ...
1
vote
1answer
60 views

Move a MySQL 5.5 database to a server running MySQL 5.1

I have a backup of a MySQL database (using InnoDB) from a Windows machine that was running MySQL 5.5. The Windows machine is no longer available and now I need to import the backup into an Ubuntu box ...
1
vote
1answer
29 views

Does InnoDB Log Files take RAM space or Disk Space

When I set InnoDB Log File size to 512M, does it take the space (512M * 2) from RAM or the SSD Disk space? When I explored, I can see that the log files are located inside /var/lib/mysql folder. So ...
0
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0answers
71 views

MySQL Crash due to “InnoDB Assertion” after Query

Current setup: Ubuntu 12.04 LTS MySQL 5.5.31 Current Use: Slave - Only ETL queries 64 GB RAM Intel(R) Xeon(R) CPU X5670 @ 2.93GHz - 12 Cores - Hyperthreaded (24 Logical) MySQL Main Settings: ...
0
votes
1answer
448 views

How to resolve “InnoDB data dictionary has tablespace id N” [duplicate]

I recently messsed up a migration to table-per-file for my dbs. In the end I (thought) I dropped all dbs, deleted any left over files, and then started over from scratch, importing only dbs I needed ...
-1
votes
1answer
90 views

How to efficiently model this simple data structure?

catId(INT) | userId(INT) | catName(VARCHAR) 0 1 Cat1 1 1 Cat2 2 2 U2Cat1 3 2 ...
19
votes
1answer
28k views

What is the best way to reduce the size of ibdata in mysql?

I have some Production servers whose ibdata files increases in size day by day. It has already consumed 290GB of space. The tables in the servers are mostly InnoDB and there are high read and write ...
1
vote
1answer
93 views

Immigrate to file-per-table mode in MySQL

I have 20 MySQL databases and in each there are about 20 tables. All the data is saved in a file called ibData1. Now I discovered about the file per table mode but if I change the value in the my.ini ...
0
votes
1answer
227 views

Best Innodb Buffer Pool Size for 8GB RAM?

I found out that my MySQL server is configured with only 128MB for innodb_buffer_pool_size. That is not enough considering that I have a 8GB RAM server. It hosts MySQL server and an Apache/Catalina ...
0
votes
0answers
93 views

MySQL - Pending flush list, aio write, and the innodb_use_native_aio parameter

I'm running an Amazon RDS instance with MySQL 5.5. The applications using that are very write intensive, and there's over 1TB of data. Everything was fine until a recent minor version upgrade and ...
0
votes
0answers
377 views

Benchmarking MyISAM vs InnoDB using Sysbench on MariaDB-10.0.14

I performed a "read" benchmark on MariaDB-10.0.14 db server using sysbench to compare performance between InnoDB and MyISAM on a single. Below are the sysbench commands i used: Create test table in ...
3
votes
1answer
4k views

When are InnoDB table index statistics updated?

In a vanilla build of MySQL 5.5.20, when are InnoDB table index statistics updated? What events trigger such updates? I've seen comments suggesting that the following might trigger it: table is ...
0
votes
1answer
36 views

update column without auto timestamp update

Hello everyone I have got a product stock table with a time-stamp column so the so any updated to that row will update the time stamp ,I'm happy with this setting but sometimes I want to update the ...
2
votes
2answers
3k views

MySQL 5.1.63 - using tuning-primer - Table Cache question

tuning_primer says the following: TABLE CACHE Current table_open_cache = 812 tables Current table_definition_cache = 256 tables You have a total of 498 tables You have 812 open tables. Current ...
0
votes
1answer
173 views

MariaDB Galera setup with drastically different amounts of memory used on cluster nodes - why?

We have a 3 node MariaDB Galera cluster. All nodes are identical and the config on each is identical. They have 64GB of RAM each. The output of the following query is 28: SELECT ...
0
votes
1answer
209 views

Workaround to avoid read-only table locking during execution of MySql OPTIMIZE command

We need to optimize a large table (on a weekly basis) in order to reclaim disk space, since records are being deleted regularly from the table. The table in question is an InnoDB table and the ...
0
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0answers
66 views

How to diagnose MariaDB crash when changing InnoDB column to AUTO_INCREMENT?

I have this table, and I'm trying to change the first column to AUTO_INCREMENT: +------------+---------------------+------+-----+---------+-------+ | Field | Type | Null | Key | ...
0
votes
0answers
92 views

Using partitioned table, and dealing with auto_increment PK

I have a big table (>100 million rows) that tracks user's activities. It has an ID, which is PK and has auto_increment property. This is the only unique key. Table also has userid and datetime column. ...
0
votes
1answer
32 views

InnoDB error: exceeded log capacity…but only during import

I see this error in mysql.log: InnoDb error: the age of last checkpoint is...which exceeds the log group capacity etc.. I think I understand it, but the fact is that it's happening only during a ...
1
vote
2answers
89 views

Fourth inner join to the same table increases query duration significantly

As soon as I add a fourth inner join to a specific table, the query duration increases significantly: sub 1sec to 45sec. The table in question is deployments d4. The SQL Query: select a.id as ...
0
votes
0answers
46 views

MySQL on Server side PRIMARY KEY taking automatically random Id

I have problem in my database which i have uploaded in Database Version libmysql 5.1.73 In that i got problem like one PRIMARY_KEY field incrementing random values. inserted id's like 1, 2, 35, 67, ...
0
votes
1answer
114 views

In which situations is TokuDB higher performance? [closed]

I noticed that WordPress runs quite a bit faster when I use XtraDB (MariaDB's InnoDB replacement) instead of TokuDB. This is strange, because TokuDB is advertised as being 20x faster. However, I ...
0
votes
1answer
89 views

mysql autoincrement counter

I need a way to keep auto-increment counter between mysql service restart. As docs states by default after restart mysql autoincrement counter start from max(id)+1. How can I keep the last ...
0
votes
3answers
246 views

Mysql Create table shows ERROR 1005 errno 150

I am trying to make a junction table, but I getting a ERROR 1005 errno 150 CREATE TABLE 61furiousFistPokemon( cardNumber int NOT NULL PRIMARY KEY, pokemonName VARCHAR(12), type VARCHAR(10), stage ...
0
votes
0answers
1k views

The total number of locks exceeds the lock table size, even after increasing buffer pool size

I am trying to partition a table with 200 million records in it. This table already exists: CREATE TABLE linkmap_ntoken ( target_nToken varchar(200) NOT NULL, ntoken_hashcode int(15) NOT NULL, ...
2
votes
1answer
72 views

Super slow (day long) count(*) after upgrade to 5.6

After upgrading to Percona 5.6.20 from 5.5.34 I noticed counts on larger tables take a massively long time to execute. The table is about 27G and 300M rows. It is not compressed and was innodb ...
1
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0answers
90 views

MySQL keeps inserting new rows automatically [closed]

I have no clue of what is going on. My script goes this way: $i = 0; $c = $somecount; while($i < $c){ $en = comment_version($comments, $i, 'en'); $ru = comment_version($comments, $i, 'ru'); ...
0
votes
1answer
33 views

How to combine duplicate parent rows in a relational MySQL table

I have my DB structured like this with people.person_id as the foreign key for each row in people_meta. people table ╔═════╦════════╦═══════╗ ║ id ║ fname ║ lname ║ ╠═════╬════════╬═══════╣ ║ ...
0
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0answers
93 views

Very slow response even with a high number of available connections

I'm running this server for data mining purposes. It runs several compute-intensive data mining applications in parallel and does simultaneous access to the MySQL server. Here are the ...
1
vote
2answers
373 views

Very high load avg for MySQL database [closed]

I have a backend server which response to my clients app, it has more than 20k~25k hit per second and this make my server load average very high, I believe that my MySQL config is not appropriate. In ...
2
votes
2answers
140 views

Should we enable innodb_file_per_table for single tenant SaaS app (thousands of databases)

We have a mySQL backed SaaS application where each customer has their own mySQL database. So think of it like a wordpress/magento etc. database for each client. Each database has ~200 table, and we ...
1
vote
1answer
181 views

I broke replication. Could this have been fixed?

I ran mysql_upgrade on both my master and slave after upgrading to a later version of mysql. Somewhere during this process replication broke for the mysql table. I was able to fix it manually, but ...
2
votes
1answer
9k views

How can extract the table schema from just the .frm file?

I have extracted the data directory of mysql from a backup and need to get the schema from an old table, however it's a backup from a different machine. I have read a fair number of tutorials today ...
1
vote
1answer
223 views

How to take physical backup of MYSQL database

I am trying to find out some tool which can take physical backup of MYSQL database. Like mysqlbackup but it is not open source. There is mysqldump but i want to take physical backup. Can someone ...
0
votes
1answer
39 views

Identifying root cause of slow query outliers from pt-query-digest?

I've run pt-query-digest and noticed many outliers with very high query times. Many of these queries do not perform slowly when I run them myself, and I'm having trouble figuring out the root cause of ...
0
votes
1answer
63 views

Sudden periods of performance degradation

For the past couple of days, Ive been observing periods of huge performance degradation. CPU usage on our master MySQL server (Percona Server (GPL), Release rel24.1, Revision 217, InnoDB version ...
0
votes
2answers
118 views

MySQL thousands connections after convert MyISAM to InnoDB on fail-over structure

I've acquired a fail-over structure and I migrated my databases to new structure converting all tables of my database from MyISAM to InnoDB engine, but, after import all databases, I have a problem ...
3
votes
1answer
361 views

MySQL / Fusion IO Configuration Question

I need a little configuration optimization. I think what I have is pretty good but feel like there's still room for improvement. Current Config [mysqld] user=mysql datadir=/var/lib/mysql ...
1
vote
1answer
787 views

Shut Down MySQL during InnoDB rollback after crash

I am puzzled once again. We had a server crash last night during some huge queries. Upon restart in the morning MySQL went into recovery mode. I needed to shut down the MySQL service and it is ...
0
votes
0answers
59 views

innodb fulltext Table handler out of memory

I am running mariadb 10 and have a large innodb table with a fulltext index. When searching I am regularly getting this error ERROR 128 (HY000): Table handler out of memory Is there some way I ...
2
votes
1answer
176 views

poor and/or unreliable InnoDB performance

I recognize that there are a ton of posts like this, but after reading up on InnoDB performance problems, nothing I tried has helped. I have a database containing four InnoDB tables. The largest ...