InnoDB : MySQL's ACID-compliant Storage Engine

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Flexible and robust way to cull older data?

I am no DBA and that is becoming more apparent daily, as such I am having trouble keeping my query times reasonable. I have about 3.57 Million records ( at about 3.43 GB ) and it takes about 2 minutes ...
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1answer
175 views

Mysqli prepare error: Unknown storage engine 'InnoDB'

I'm getting this error on my XenForo installation. Server logs show out of memory because of too many php processes opened up which cause mysqld to shutdown. The WordPress installation associated with ...
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1answer
123 views

Too much IO to MySQL InnoDB log files

I am using MySQL version: 5.5.38 I have dedicated HDD to InnoDB log files using innodb-log-group-home-dir option. atopsar -d 30 shows big load (>50%) to this HDD The thing is that I have only 75 ...
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1answer
217 views

How can i import 150GB database after deleting ibdata1,logfile in MYSQL?

I have 150GB database and my ibdata1 file size is 240GB so i want shrink the ibdata1 file so for that i have to export the DB and then drop the tables and then stop mysql, delete the ibdata1 file and ...
5
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1answer
104 views

'SELECT my_table.id' slower than 'SELECT my_table.*'

Running MySQL with InnoDB: I have a SELECT wide_table.* query that I want to refine to SELECT wide_table.id since that's all the calling code needs. Testing it out I've found that the execution time ...
2
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1answer
62 views

MariaDB 10 InnoDB Partition with Data Directory

mysql --version mysql Ver 15.1 Distrib 10.0.20-MariaDB, for Linux (x86_64) using readline 5.1 I have a MariaDB 10 installed, though I tried with the 5.5 release in the CentOS repos. I'm ...
7
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3answers
479 views

Full text search results in a large amount of time spent in 'FULLTEXT initialization'

I'm currently trying to run some queries against a data dump of Stack Overflow's comments. Here's what the schema looks like: CREATE TABLE `socomments` ( `Id` int(11) NOT NULL, `PostId` int(11) ...
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1answer
2k 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 ...
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2answers
65 views

Would increasing innodb buffer pool size prevent a mysql crash?

My server keeps running out of memory for mysql. I keep getting. 150708 3:39:09 [ERROR] /usr/sbin/mysqld: Out of memory (Needed 258064 bytes) When I looked in my.cnf I saw that ...
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1answer
37 views

Cannot Start mySQL Daemon with Error “mysqld from pid file … ended”

I cannot get MySQL to run. It was working just fine hours ago, but upon starting, repeatedly ends without telling me very much. Here are my logs [myusername@location ~/mysql]$ ./bin/mysqld_safe ...
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0answers
7 views

what is ord_part in dict_col_struct for MySQL? [migrated]

I was trying to understand a variable ord_part in the dict_col_t struct. Here is declaration: http://osxr.org/mysql/source/storage/innobase/include/dict0mem.h#0428 which says unsigned ...
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1answer
157 views

InnoDB internals - checkpoint, LSN, dirty pages

I'm looking into InnoDB internals regarding buffer pool, checkpoint and dirtypage. However there isn't enough information to answer my question. When I run show global status, I can get ...
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0answers
26 views

Partial restore of InnoDB from snapshot

We currently run a mix of MyISAM and InnoDB tables on an older version of MySQL. ZFS is used as the filesystem which allows us to take instant snapshots of mysql data. One useful case for this has ...
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2answers
2k views

MySql InnoDB tables are missing after restarting

I had a MySql database with a few InnoDB tables. After restarting the server, and starting MySql Server again, I connected to the MySql Server using MySql Workbench, and couldn't see the database at ...
0
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1answer
182 views

Can't Delete Orphaned MySQL Temp Table

One of my servers had a hick-up yesterday and decided to leave temporary table while (while running alter table add indexes). ls -l sql -rw-rw---- 1 mysql mysql 8570 Mar 13 12:05 #sql-ib32694.frm ...
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1answer
83 views

Optimizing Queries HAVING COUNT and INSERT…ON DUPLICATE KEY UPDATE

There are two main queries I'm tying to improve, one question is much more conceptual and learning about databases and another is much more straightforward. Both cases deal with the same table It has ...
5
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1answer
1k views

Insert Speeds for large batches

In my application, my INSERTs seem to be taking a major chunk of the time. I have a large number of objects in memory (~40-50,000) which i want to insert into a table. Lets take a sample table ...
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0answers
63 views

Mysql Match…against query performance in InnoDB Mysql 5.6

I need to search records in the table which contains millions of records. I have recently updated Mysql version from 5.1 to 5.6. I was using like in query which was taking around 15 sec to 30 sec. ...
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2answers
2k views

MySQL 5.5 Fail start Fedora 16

I installed mysql and mysql-server from the repos (MySQL version 5.5). Then tried to start it, but got an error. [root@server]# service mysqld start Redirecting to /bin/systemctl start ...
3
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2answers
173 views

MySQL 1264 warning from libmysql

I'm using the libmysql.dll library to connect to my database from a 3rd party application (metatrader). I managed to connect and things are going almost fine. I use mysql_real_connect and ...
1
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1answer
239 views

Innodb buffer pool indexes versus data usage

The server has 128GB of RAM. The innodb_buffer_pool_size is set to 106GB. mysql> show global variables like 'innodb_buffer_pool_size'; +-------------------------+--------------+ | Variable_name ...
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3answers
3k views

Using MySQL triggers or transactions?

I want to ask your opinion in using MySQL triggers or transactions in a website. Actually I have a history payment table with - UserId | OperationId | Comment | Credits | Sign (debit or credit). So ...
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2answers
201 views

How to optimize indexes on MySQL query with various sorts

I have an INNODB table levels: +--------------------+--------------+------+-----+---------+-------+ | Field | Type | Null | Key | Default | Extra | ...
0
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1answer
156 views

Lowering MySQL Memory Usage without Restart

We are using Percona Server 5.5.35-rel33.0-611.precise with InnoDB in our production server. Recently Mysql memory went high and it did't drop from there. We are afraid whether it would result in OOM ...
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249 views

How do I recover from MySQL InnoDB table/index corruption?

While trying to upgrade a database (in place) I got the following error. The server starts up and everything seems to be fine, except that the table mentioned in the message is no longer accessible. ...
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2answers
1k 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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1answer
354 views

innodb completely crashed after interruption

I am having a major crash on mysql affecting a lot of websites. We had a crash on our SAN storage. Since that time, mysql refuse to start. I tried to reinstall mysql, but still no luck. I think ...
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1answer
41 views

mysql replication and innodb_file_per_table

Is it possible for the master (5.1) to have innodb_file_per_table = 0 and for the slave (5.1 or 5.5) to have innodb_file_per_table = 1 ?
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2answers
561 views

Restore InnoDB to different machine

It was pointed to me from serverfault that the following question would be a better fit here so this is basically my original question from there. I currently have backups that were taken with ...
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4answers
83 views

SQL retrieve last elements of table using group by like behaviour

I am trying without success to retrieve the last version of all articles in a table. The table structure: CREATE TABLE `journalarticle` ( `uuid_` varchar(75) DEFAULT NULL, `articleId` ...
0
votes
2answers
43 views

Performance impact of adding a foreign key to a 1M rows table

I have an ecommerce database running MariaDB + InnoDB, which has a table to store the transactions (T) and another which stores quotes (Q). I'd like to make a connection between T and Q by adding a ...
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2answers
122 views

Invision Power Board 3.4.6 - mysql locks during query with pending updates

about 2 weeks ago, we started experiencing random lockups and slowdowns on our forums. We've been running this site for around 6 years minimum with no issues. the site and db are on dedicated vms. The ...
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0answers
16 views

Dropping a corrupt table in innodb_force_recovery 6

As often happens in mysterious shutdowns during large queries, things ran afowl with InnoDB on my XAMPP MySQL installation (Windows 7 x64). I rebooted and ran Startup Repair, then loaded MySQL to ...
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2answers
3k views

Hyperthreading & MySQL InnoDB Thread Concurrency Performance

I have a dedicated DB Server with the following specs" Ubuntu 12.04 LTS Server Intel(R) Xeon(R) CPU X5670 @ 2.93GHz 12 Cores MySQL 5.5.29 64 GB RAM RAID10 We are currently doing Hyperthreading ...
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2answers
918 views

Mysql Deadlock on update query on same row

My server is experiencing occasional deadlocks on two update queries on same row both using index (primary key). The conflicting queries are: UPDATE auth_user SET rep_score=185 WHERE ...
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3answers
38 views

guideline for calling optimize table after alter table?

Should I be calling 'optimize table' when changing datatypes of columns, adding indexes or dropping indexes, assuming a table with millions of rows, heavily used, both for reading and writing ...
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2answers
25 views

How to check innodb history list length?

The output for show engine innodb status has the history list length as a number, but that output is hard to parse, and there's just too much data when all you want is a single value. Is the value ...
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5answers
853 views

MySQL runs out of memory when importing innodb database

I have a small VPS with 512MB RAM and no swap (can't have any). I am importing a 1.5GB innodb database with mysql -u -p < database.sql Before the operation can finish it says : Lost connection ...
2
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1answer
50 views

innodb , mysql Indexes difference when adding index

When I am altering one of my MySQL table to add an index I am getting below error in error log. Table a/b contains 4 indexes inside InnoDB, which is different from the number of indexes 3 defined ...
2
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0answers
42 views

innodb update with limit locks all matching (ignores limit)

For a query similar to this: UPDATE myinnotable1 SET value=5,updated=now(),status=1 WHERE status>10 AND message="match msg" LIMIT 1; I found that innodb engine locks ALL rows matching criteria ...
0
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1answer
94 views

.ibd file is missing and alter table discard tablespace crashing the server

Data file(.ibd) for one of my mysql table is missing in data directory. As read in some articles i want to resolve the issue by discarding tablespace first ,import the tablespace (cfg file of said ...
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1answer
117 views

Mysql InnoDB vs Mongodb write performance

I need to increment a counter each time a web page is rendered. When I use mongodb to do that, I can do about 16000 writes per second on a 4 cores/8 threads CPU on a regular disk. When I use Mysql ...
3
votes
3answers
12k views

MySQL using too much CPU

I'm studying to be a DBA right now because I have a massive live database that is very sensitive that I manage. Here's the current system stats of my dedicated database server: CentOS 5.9 24gb Ram 8 ...
2
votes
1answer
60 views

MySQL Performance: conditionnal left outer join vs where only

I have three tables: FORUM ( id PRIMARY KEY, public BOOLEAN ) MESSAGE ( id PRIMARY KEY, content VARCHAR(255), user_id NULL FOREIGNKEY user.id, forum_id FOREIGNKEY forum.id) USER( id PRIMARY KEY, ...
0
votes
1answer
17 views

Aruba-MySQL: can't create/change table to engine=INNODB

We have our database stored in aruba (mysql.aruba.it) where there is a table called "task". Because of many changes in the requirements we decided to drop the table and create it again from 0 with ...
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0answers
8 views

Database storage engine and performance [duplicate]

What will be the performance issue when I change my database storage type from MyISAM to InnoDB?
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2answers
1k views

How to split a string to and get info from another table in mysql

I have a system to assign score for each sentence stored in a column: TABLE 1: word_scores word score this 3 is 4 a 5 test 1 another 0 sentence 8 TABLE 2: ...
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0answers
24 views

Should innodb_buffer_pool_size be much larger than the innodb_buffer_pool_bytes_data?

Our old server had 32GB total RAM, 18GB allocated to innodb_buffer_pool_size. It also had 10GB for the php_memory_limit. The new one had 16GB RAM, 9GB for innodb, 5GB for php. The same application ...
2
votes
3answers
90 views

All My Databases Are Gone?

Today I changed my username and password in MySQL and I logged into phpmyadmin to see that all my databases were gone. I've tried changing the datapath but then I realized I didn't see any of my ...
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1answer
285 views

mysql innodb_buffer_pool_size let me understand

I couldn't find answer for my situation. I have a windows server 2008 with 2 cores and 7 GB RAM (Azure D1 VM). I'm running mariadb 10.0.14 on it. I have 2 databases (1.5GB and 9GB in size). ...