InnoDB : MySQL's ACID-compliant Storage Engine

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ALTER primary key column from INT to BIGINT in production (MySQL 5.6.19a)

Some INNODB tables in our production database are about to hit the INT AUTO_INCREMENT limit of 2147483647 and we need to alter them to BIGINT otherwise writes will start failing. The tables are in a ...
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100 views

mysql write lock

I dont add any manual locking or any transaction anything, just manual running queries from php script, and execute below two update queries at the same time update table_x set status = 'PROCESSING' ...
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1answer
28 views

Yet another “ERROR 1005 can't create table” question

Well, I've been looking at the ERROR 1005 questions, but I haven't been able to see my error among the issues addressed by those questions. This code is generated by MySQL Workbench under Linux. Can ...
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1answer
55 views

Why does InnoDB allow a 772 byte unique constraint?

I've defined a unique constraint for two columns: A bigint and a VARCHAR(256) COLLATE utf8mb4_unicode_ci Then this error occured (which I'm already familiar with): Specified key was too long; max ...
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1answer
38 views

“Unknown table engine 'innodb'” error after changing my.cnf

I am getting "Unknown table engine 'innodb'" for some query after changing my my.cnf. I have reverted the old my.cnf and restarted mysql and now I can see innodb. Could you please help me figure out ...
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0answers
19 views

Big cpu caused by mysql

I have big cpu caused by mysql, 3 vcores, centos 6 64bits http://s3.postimg.org/z8l73e98z/mysql.png [mysqld] datadir=/var/lib/mysql socket=/var/lib/mysql/mysql.sock user=mysql symbolic-links=0 ...
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1answer
91 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
17 views

What if we skip the slave by counter 1 when it failed at event 1 of a transaction which has events 2 and 3

We have a master-slave replication which has all Innodb data. I ran 3 update statements under one transaction on master. ============= start transaction update T1 update T2 update T3 end ...
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2answers
45 views

troubleshoot high value for mysql innodb pages written per second

Our database is writting about 600 pages a second to its innodb buffer pools. Usually this value is about 10 pages/sec, so the server is experiencing a very high IO utilization, around 50%. Is there ...
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1answer
69 views

Doubts about Converting MyISAM to InnoDB (master/slave and more)

I want to convert my MySQL DB (46 Tables, 2.1 GB) from MyISAM to InnoDB. I have a couple of questions about this process. Since I have a Master/Slave structure, do I need to manage this and change ...
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2answers
51 views

How can delete an orphaned temporary table on Mysql Innodb?

I was issuing an Alter table statement and suddenly the server crashed, Now i can not run any alter table to that table because it shows me the error 1050 and it says that a table named #sql1504d ...
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1answer
61 views

Concurrency when simulating autoincrement with triggers on MySQL

I am updating an old application to implement virtual tenancy, which involves adding a tenant_id column to the primary key of every single table. The application uses auto-incrementing columns ...
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1answer
25 views

Acceptable to use Antelope and Barracuda simultaneously?

I've been doing some reading about the Antelope and Barracuda file formats for InnoDB. I recall at least one source mentioning that the two should not be used simultaneously. I can't think of a good ...
0
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1answer
22 views

Will a static MySQL database become bigger in file size over time, even without anyone writing to it?

I backed up a database a few weeks ago, then for comparison downloaded it again. It was about 10,000 kB larger. There should not be anyone writing to it, but there are lots of reads. Will a static ...
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1answer
122 views

What is InnoDB Buffer Usage and how to clear it?

In Mysql Workbench when I go in Server > Server Status there is a field called "InnoDB Buffer Usage" It is "95%" even if there is no query running. Why? It affects my performance in my new queries? ...
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67 views

Is it a waste to set innodb_buffer_pool_instances greater than the # of CPUs?

I set the innodb_buffer_pool_size to 20GB on a server with 12 CPU cores. My full database is 11gb, however most of it is archived tables that are almost never used. The total queried data is around 3 ...
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2answers
37 views

InnoDB row metadata size (minimum row size)

I'm trying to decide whether to normalize a thing further, and need to know what the smallest a row in InnoDB can be (I've got MySQL 5.6). This is not exactly my case, but for simplicity, let's ...
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2answers
72 views

MySQL - Changing from system tablespace to file per table

The MySQL database I am working on has the InnoDB tables and indexes stored in the system tablespace which is now > 20Gb. Some years ago I managed a MySQL database that made use of a file per table ...
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2answers
204 views

How to speed up mysql export and import

I need to perform a DB migration from Server A to Server B. Server A: MySQL version installed 5.0.6 Server B: MySQL version installed 5.6.20 OS: Both are running RedHat Linux 64bit. 16 ...
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1answer
55 views

What can I do about this MariaDB 10.0 error?

I have a serious error that crashes the mariadb service, and it won't start up again until I delete the database folder in the data directory of the database I was working on at the time. Here is the ...
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4answers
61 views

If all tables are myisam, should I use myisam engine instead of default innodb?

I have read all of the innodb/myisam threads and they are confusing. Everyone says innodb but I am assuming that they are saying innodb engine with innodb tables.? The software I am using creates ...
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4answers
101 views

with MySQL, are multiple single column indexes faster than one multi-column index? [closed]

I have a performance related question, in MySQL, are multiple single column indexes faster than one multi-column index?
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1answer
62 views

How to optimize a slow query?

I work as an administrator and software developer for a company that provides services to the car selling business. In essence we develop the software that they use when selling cars and such. This ...
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2answers
24 views

How does InnoDB access disk?

I know that block(multiple disk sectors) is the basic unit of data transfer for the virtual file system so, if NTFS uses 4 KB cluster size for files how does InnoDB access disk if it uses 8 KB page ...
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2answers
57 views

Question About Large InnoDB Table with Deleted Rows

Our server has a DB that's over 600 GB - we are deleting older rows that are non-essential to contain the growth. We can't optimize the table due to possible downtown on the table but we are ...
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1answer
245 views

Server stuck in INTERNAL DDL LOG RECOVERY IN PROGRESS

Recently, one of my servers had a crash. I had alot of trouble but managed to restore everything. But, Now, the first background thread upon startup is locked on "INTERNAL DDL LOG RECOVERY IN ...
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How “relatively safe” is the data which was salvaged from corrupted MySQL InnoDB database?

I encountered the corruption like the following. 150208 14:27:52 InnoDB: Error: page 443375 log sequence number 8941 870477908 InnoDB: is in the future! Current system log sequence number 5968 ...
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1answer
82 views

MySQL Create Table with Partition Slow on server machine

Following create table statement with Partition runs in 10 Second on My Development Machine windows 7, i5 , 8GBRam, single disk runs in 16 Second on Virtual Machine windows server 2012 , xeon 2GHz ...
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44 views

InnoDB Deadlocks Involving Currency Transactions

We're dealing with InnoDB deadlocks that are affecting our virtual transaction system. LATEST DETECTED DEADLOCK 150210 20:51:03 *** (1) TRANSACTION: TRANSACTION 0 4240405649, ACTIVE 0 sec, process no ...
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0answers
24 views

DB Rolls Back And Loses Data

So we've come across an astounding issue here. At random moments, our DB is dropping the database and recreating the table with data from an earlier point in time. Unfortunately general query logs ...
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0answers
162 views

MYSQL: InnoDB inserts wont rollback transaction inside a stored procedure

I have this stored procedure: START TRANSACTION; code_gen_loop: WHILE @Codes > 0 DO IF MOD( @Codes, 10000 ) = 0 THEN EXECUTE qry_status_stmt2; EXECUTE qry_status_stmt3; ...
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1answer
41 views

Change Storage Engine on Referenced Tables

i need to change storage engine from 'InnoDB' to 'MyISAM' on some tables of different databases. So i made a script file to do so: #!/bin/bash DATABASES=$(mysql -u XXXXX -pXXXXX --skip-column-names ...
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2answers
55 views

How to Permanently solve MySQL error 2002 (HY000)

I have a problem on my cloud server with 2GB of RAM and 40GB Hard Disk that's hosting a Wordpress website that receives around 1000-2000 hits a day. My problem is that MySQL is always crashing and my ...
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2answers
89 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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6answers
4k views

DELETE command not completing on 30,000,000 row table

I have inherited a database and am looking to clean and speed it up. I have a table that contains 30,000,000 rows, many of which are junk data made by an error by our programmer. Before I add any new, ...
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2answers
59 views

Is possible to backup database online using rsync?

Some people tell me that the backup database on-the-fly using rsync is possible. I think it is possible but not safe because some log, buffer... is not flushed. Database is being recovered from the ...
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0answers
47 views

MySQL - Cannot add new Foreign Key

I'm using magento and it does some re-index for a product flat table structure. In this process a new table is created. The SQL for that table is something like: CREATE TABLE ...
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2answers
37 views

Is it a good idea to add a reserved field to a large MySQL table?

As you may know adding a new column to a MySQL table with millions of records is hard and in some cases impossible. Is it a good idea to add a text column to each table (say, meta) to save some ...
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55 views

54M InnoDB keeps shutting down unexpectedly [duplicate]

I have a mariadb server running several databases with very small load. From time to time, when I have 20+ users browsing one of the wordpress websites i have, the daemon just shuts down with the ...
2
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3answers
386 views

UPDATE waits for lock too long after SELECT in MySQL (Innodb)

I have PHP function Pics::getPicture (yii2 ORM) which selects one row from table and then updates one field from this row. The table structure contains only id (PK), path (VARCHAR(500)) and seen ...
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1answer
82 views

Dropped connections, corrupted schema … is MySQL sick?

Lot's of problems and I wonder if it's all tracable to some root cause. I'm trying to load a simple schema related to product marketing. The symptoms are: Not being able to forward engineer said ...
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1answer
98 views

Cannot add a column to an InnoDB table in Mariadb

I have this InnoDB table with less than 10 rows in mysql 5.5.40-MariaDB on Linux (x86_64). +-----------------+--------------+------+-----+-------------------+----------------+ | Field | ...
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1answer
46 views

MySQL Data Files Missing?

We are upgrading our website and I was checking on the size of the new database compared to the old one and was really surprised to find that in the /var/lib/mysql/ directory, the only files there ...
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0answers
29 views

Would we see a performance increase by moving one table to another physical drive?

We have a database of about 600MiB. One table is particularly large and occupies about 70% of that space. We quite often have to query this table - sometimes as far back as a few years, so we can't ...
0
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1answer
605 views

Row size too large (> 8126)

I'm facing the following problem. Row size too large (> 8126). Changing some columns to TEXT or BLOB or using ROW_FORMAT=DYNAMIC or ROW_FORMAT=COMPRESSED may help. In current row format, ...
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31 views

How to synchronize locally two DB table in Master server in MySQL Server 5.6.19

I want to synchronize the locally two DB tables in Master Server. Suppose that first i have already table Employee in a Master Server. The Table Employee have already 20 fields records. Then i have ...
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2answers
746 views

ROLLBACK doesn't work after INSERT INTO newly created destination table

I am working on PHP-script which imports CSV file (customers.csv) into MySQL table (customers). Before inserting contents of CSV-file into the mysql table I am first backing up the original customers ...
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1answer
114 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
62 views

Is >58 hours to create an index normal? Should I cancel and try again?

I have an InnoDB table with ~43,964,557 rows containing 20.5 GiB of data (not counting existing indexes). mysql> show table status like 'backpack_items'; ...
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55 views

MySQL InnoDB Configuration with 60Gb of Memory

I'm running a large MySQL Database, in the range of 30Gb in size. The MySQL 5.5 server is running on a dedicated server with 60GB of RAM, with no other processes installed apart from monitoring tools, ...