InnoDB : MySQL's ACID-compliant Storage Engine

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4
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3answers
7k views

Concurrent MySQL updates hang with InnoDB (on Amazon RDS)

I'm running into a problem where multiple MySQL updates being performed at the same time will lock up and takes several minutes to finish. I'm using InnoDB, so I'm confused as to why this could be ...
3
votes
2answers
6k views

How to make CREATE INDEX in InnoDB table faster

I have platform RHEL 5 with 8G RAM and MySQL version 14.12 distrib 5.0.86. I want to create an index in an InnoDB table, but it takes a long time: Time | State | Info 2291 | copy to tmp ...
4
votes
3answers
12k views

MySQL - fastest way to ALTER TABLE for InnoDB

I have an InnoDB table that I want to alter. The table has ~80M rows, and quit a few indices. I want to change the name of one of the columns and add a few more indices. What is the fastest way to ...
6
votes
2answers
2k views

MySQL deadlock - cannot restart normally?

MySQL version 5.5.13-1 A snippet from the SHOW ENGINE INNODB STATUS\G: LATEST DETECTED DEADLOCK ------------------------ 111218 10:22:34 *** (1) TRANSACTION: TRANSACTION 1318D95B, ACTIVE 0 sec ...
9
votes
6answers
18k views

Fastest way to check if InnoDB table has changed

My application is very database intensive. Currently, I'm running MySQL 5.5.19 and using MyISAM, but I'm in the process of migrating to InnoDB. The only problem left is checksum performance. My ...
2
votes
3answers
3k views

Improve `Update` performance (rows locking issue)

I am running 30 scripts (PHP CLI) on Linux , each script are updating (loop) the data in the MySQL database. When I typed 'mysqladmin proc' in terminal, I can see a lot of rows has been locked for ...
3
votes
2answers
4k views

Table compression in InnoDB?

I have read that table index compression happens just in MyISAM, but I came across an article in dev.mysql that said: InnoDB supports table and index compression! So now what is the pros of MyISAM? ...
2
votes
2answers
1k views

Which first: upgrade mysql version or convert storage engine?

I inherited a production mysql server at 5.0. It uses MyISAM exclusively. It is not a high volume database but it does have some large datasets. I am planning on: upgrading to 5.5 converting ...
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2answers
2k views

Where should I look for my.cnf?

I want to add innodb_file_per_table statement to my.cnf file. Where is my.cnf? Could I change this file when I have an online site?
2
votes
2answers
547 views

Any problem will all InnoDB and one MyISAM table?

I have a MySQL 5.5 DB with all InnoDB tables. For some reason, one of the developers decided to create a MyISAM table. It is a log table for user sessions. I don't see why we should mix in a MyISAM ...
3
votes
1answer
625 views

Do I have duplicate key indexes?

CREATE TABLE relations ( object_id BIGINT(20) NOT NULL PRIMARY KEY, object_term BIGINT(20) NOT NULL, UNIQUE KEY link(object_id, object_term), CONSTRAINT fk_term FOREIGN KEY(object_term) ...
21
votes
1answer
35k 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 ...
2
votes
1answer
169 views

How can I best combine “get categories” and “has user access”?

I was wondering if it's possible to create a query for the following problem. I only want to select categories from the (MySQL) database (if the user has access). A user has multiple roles; A ...
2
votes
2answers
7k views

Set up a MySQL slave using mysqldump to get the initial data

I have a master database which already has some data in it. The tables in the master database include both MyISAM and InnoDB engines. Now I want use mysqldump to dump the initial data of my slave ...
6
votes
2answers
2k views

Why does MyISAM support FULLTEXT Searching and InnoDB does not?

I know the basic differences between the MyISAM and InnoDB engines. In MySQL 5.6 beta, InnoDB will support fulltext search. But, I wonder why previous versions of InnobDB didn't support FTS? My guess ...
3
votes
1answer
1k views

MySQL 5.5 InnoDB = OFF?

We run a server with MySQL 5.5. 95% of the tables are set to the InnoDB engine. However whenever I look at the my.ini file (using the MySQL Workbench) under mysqld section innodb is unchecked and OFF ...
1
vote
1answer
4k views

ERROR 1114 (HY000) at line 6308 in file & The table user_analysis is full

There is a SAN mounted 1TB partition for Mysql backups in our server with version 5.0.45-log. From two days, im seeing the log entries ERROR 1114 (HY000) at line 6308 in file & The table ...
4
votes
1answer
4k views

MySQL Bug required remedy : [Warning] Invalid (old?) table or database name '#sql-'

We have a master & multiple slave replication in our production environment. At first, I found this error in the mysql error log on the master and later on the slave. As for all the replication, ...
3
votes
2answers
575 views

Monitoring InnoDB Index Utilization

I would like to monitor how many queries are utilizing the indexes. Is there any program that can show me live query performance and index utilization? Note: I am already aware of slow log file and ...
10
votes
3answers
20k views

Any better way out of MySQL InnoDB log “in the future”?

I've got this InnoDB error in MySQL 5.0. Mysqld was stopped cleanly, but I managed to lose ib_logfile0 & ib_logfile1 afterward. Now after a clean startup, InnoDB has done its "crash recovery". ...
5
votes
4answers
3k views

Incomplete mysqldump

I'm trying to run mysqldump to create a database snapshot, and I'm finding it will randomly stop midway, without reporting any error. My database is relatively small (about 100MB) and is using InnoDB. ...
4
votes
2answers
1k views

High Disk IO, How to mitigate?

I'm a programmer, not a DBA. Be gentle :) Overview InnoDB, MySQL mod_perl script, persistent connections script called every 20 seconds by thousands of users Problem High Disk IO (presumably ...
4
votes
1answer
3k views

How do you read MySQL InnoDB Monitor output?

I am new to DB Administration. I am trying to figure out the cause of deadlock exceptions, but I am unable to make sense of the logs. The log says that "transaction 1 is rolled back". Why is this the ...
3
votes
2answers
707 views

MySQL corruption even after full dump and re-import

We have a production issue where MySQL has started spitting InnoDB corrupt page errors and falling over. The error message seem to relate to indexes so I assume the data itself is ok and when I ...
3
votes
1answer
523 views

MySQL InnoDB Plugin default engine type not accepting config setting

I have a strange MySQL InnoDB issue that I've been struggling with for a few hours now. I'm asking this here, and also on the main StackOverflow site - I will cross-post the answer to the other site ...
2
votes
3answers
559 views

What is the optimal solution for converting a database schema?

I actually want to get rid of the existing constraints in the database which I know sounds crazy but we are upgrading our application to a new framework which relies on the foreign key constraint ...
3
votes
2answers
2k views

Preventing mysql deadlocks in your php application that uses SELECT… LOCK IN SHARE MODE

If I understand SELECT ... LOCK IN SHARE MODE correctly, you can place it into a mysql transaction to select the rows you will be working with during that transaction. This is done in order to "lock ...
6
votes
3answers
12k views

Error 'Unknown table engine 'InnoDB'' on query. after restarting mysql

I have mysql DB on server S1 (mysql version 5.1.41-3ubuntu12.7-log). I have created master-slave for this DB on server S2 (mysql version 5.1.54-1ubuntu4-log). The DB on S1 was using one data file ...
2
votes
1answer
706 views

Will a row update check all child tables which have foreign key relationships in InnoDB?

I have a master table and around 60 to 70 child tables, all are InnoDB tables and have foreign key relationships with the master table. Foreign key relations are On-Delete Cascade and On-Update ...
1
vote
1answer
144 views

String Pooling for MySQL

So I'm having this table that logs all errors happened in our production code. It looks like this: id | date | type | message | file | line ...
5
votes
2answers
6k views

Query runs a long time in some newer MySQL versions

I have created a database on MySQL 5.0.15. I have a query and when I run this query on this MySQL version, I get 0.9 s run time. When I import this database to another MySQL server with same hardware ...
2
votes
2answers
326 views

Is there any reason not to use Percona 'innodb_fast_checksum'?

I recently came across a change that Percona Server implemented over normal MySQL InnoDB. The new feature is innodb_fast_checksum XtraDB can use a more CPU-efficient algorithm, based on 4-byte ...
4
votes
1answer
3k views

Consistent logical backup of databases that use MyISAM and InnoDB engines

I have a question regarding the logical backup of MySQL databases that use both MyISAM and InnoDB. The mysqldump utility supports these two options: --single-transaction - Creates a consistent ...
4
votes
1answer
25k views

How to Recover an InnoDB table whose files were moved around

So I have a test db server that was setup on a replication stream. Over the name an optimize came through that quickly filled up the space on the slaves datadir. Mysql dutifully was just waiting for ...
2
votes
1answer
564 views

MySQL proxy and SHOW PROCESSLIST query time

I have MySQL replication currently occurring between two masters bidirectionally, one in a data center locally, another over at Amazon EC2. Everything seems to function normally replication wise, no ...
14
votes
4answers
22k views

How do you identify InnoDB table corruption?

I have some tables that are partitioned and have several indexes on a replicated slave. After copying the snap shot (verified safe) to a new slave and upgrading mysqld from 5.1.42 to 5.5.15 and ...
9
votes
3answers
8k views

Best of MyISAM and InnoDB

Is it possible to make InnoDB to use indexes same as MyISAM instead of clustered index due to limitation of RAM while getting benefit of its concurrency performance?
6
votes
3answers
634 views

Is there a need to keep refreshing the indexes from time-to-time?

This question is common for all the database products I use, viz. SQL Server, MySQL, Oracle and PostgreSQL. I have created a fresh database and the tables, at present, have no records. I have created ...
42
votes
4answers
71k views

Possible to make MySQL use more than one core?

I've been presented with some dedicated MySQL servers that never use more than a single core. I'm more developer then DBA for MySQL so need some help Setup The servers are quite hefty with an ...
4
votes
2answers
6k views

Internal reason for killing process taking up long time in mysql

I copied a big table's structure with (it is an InnoDB table btw) CREATE TABLE tempTbl LIKE realTbl Then I changed an index, and filled it up so I could run some test. Filling it was done using: ...
3
votes
1answer
507 views

InnoDB has a transaction running, but “SHOW PROCESSLIST;” shows nothing

I have a replicated database setup, mostly Innodb databases/tables. The query that I believe caused the issue ran in about 20 minutes on the master database. This is where it gets weird. Show ...
2
votes
2answers
2k views

Corrupt InnoDB tables after every mysql restart. What's wrong?

Recently I changed a few settings in my mysql configuration. I did the following: - stop mysql - save the changed settings - delete all ibdata and ib_logfiles - start mysql Normally this works fine ...
12
votes
5answers
26k views

MySQL server has gone away obstructing import of large dumps

I am trying to import a large sql dump (2GB) to my local mysql on my mac. I have been able to do this in the past (I was using MAMP), but now I get a ERROR 2006 (HY000) at line 7758: MySQL server ...
4
votes
2answers
2k views

Preordering the table by a specified column

I have a table and I am always getting the data by ordering a column. In my case, I order by datenum. However, the selection is so slow because of the ordering. Is it possible to order the table ...
14
votes
2answers
3k views

Rows missing after online conversion from MyISAM to InnoDB

We have a reasonably small database that we wanted to convert from MyISAM to InnoDB. Being database noobs, we just converted (using alter table) without even taking the site down. Now that the ...
4
votes
1answer
2k views

MySQL 'LOAD DATA INFILE' : Can't replace entry when foreign key exists

Here's a minimal case for my database scheme: CREATE TABLE `test` ( `id` int(11) NOT NULL, `name` varchar(22) DEFAULT NULL, PRIMARY KEY (`id`), UNIQUE KEY `id` (`id`) ) ENGINE=InnoDB DEFAULT ...
1
vote
1answer
267 views

InnoDB Foreign key updating vs. manual in-application updating

I've been working on a "legacy" schema in MySQL Workbench that uses a lot of relations. All of the tables are MyISAM, however, and there are no foreign keys. However, I'm working on a new area of the ...
4
votes
3answers
678 views

Is Oracle DB immune to the InnoDB deadlocks found in MySQL?

It seems odd to me that MySQL would not handle this internally: "Deadlock found when trying to get lock; try restarting transaction" Does Oracle DB work around this issue? After all, Oracle owns ...
5
votes
1answer
4k views

Are InnoDB Deadlocks exclusive to INSERT/UPDATE/DELETE?

I am Working around MySQL error "Deadlock found when trying to get lock; try restarting transaction". I am going to have to update a program to allow deadlocks. Is it possible that SELECT statement ...
3
votes
1answer
1k views

MySQL InnoDB data file directly on a disk slice (fixed-size)?

It seems that ibdata1 is like a disk slice. In Solaris (UNIX) UFS filesystems (the common one before ZFS), one would separate their disk c0t0d0 into slices, say a 10GB drive would be cut into three ...