MySQL 5.1 : The Second Major Release of MySQL 5

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Migrating from SQL Server to MySQL using MySQL Workbench tool

I'm trying to migrate few tables from SQL Server to MySQL using MySQL Workbench migration wizard. All work fine for structure migrations but when I go to the data migration section it throws an error ...
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Circular replication with servers in different locations

My service runs on single machine, and database (mysql 5.1.66) is replicated to 2 other identical slaves (with lesser system resources, mysql 5.1.66) via chained replication. Machines are located in ...
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784 views

MySQL: Can't find record in tablename

After crash: mysql> repair table lot_not_sold; +------------------------+--------+----------+---------------------------------------------------------------+ | Table | Op | ...
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335 views

Mysql:Need to upload data to database, get duplicate key error - how can dup keys be ignored

I'm uploading data to a db (mysql 5.1.42) from a dump file using mysql command line and get duplicate key error. This is the format I use: /mnt/temp# mysql -u username -p -h url_of_db_master -D ...
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35 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 ...
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MySQL: Prevent DROP TABLE and TRUNCATE TABLE on Slaves

Can someone tell me how to prevent the following commands DROP TABLE <tbl-name>; TRUNCATE TABLE <tbl-name>; from being replicated to slaves?
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33 views

MySQL: Use Sysbench on Windows

Sysbench is a tool to analyze the MySQL performance. I downloaded it and extracted but there is no executable file. Files having extensions like .sh or .c or .h are available. I gone through the ...
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20 views

MySQL 5.1.x: Performance improvement in Enterprise edition Vs community edition

My application is running on MySQL 5.1.58 community edition. I tried to search enterprise edition of MySQL 5.1.X but only MySQL 5.6.X version of enterprise edition is available. Is it possible to ...
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MySQL grant select not working properly 5.1.73-log

I have created new users with GRANTS SELECT but this is not applied and still user have full privileges and can still DELETE, DROP, INSERT. SHOW GRANTS for dbreader; GRANT SELECT ON *.* TO ...
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MySQL Server constantly crashes

my apologies for having already posted on this issue, but it has moved on so far I feel a new question is the only way to go. First a little history - I have a MySQL server which runs a few small ...
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On replicating all tables of a given database except for those starting with some pattern

I'd like a slave to replicate all tables of a given database except for those starting with some pattern, eg. those with names starting with 'nc' (non-critical, redundant denormalized tables). So I ...
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28 views

Best way to select rows containing a substring

I've a table named comments where comment is a field where comment will be stored. Now I want to find -1 within that comment. the -1 should be independent. That is, it should not be joined with ...
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MySQL: Different thread states in Query execution

My MySQL 5.1 bases Intranet system is facing very bad performance during high load. When observe through MonYog, I found below thread states: We can simply understand the different thread state by ...
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34 views

MySQL: Algebra in Union operation

I have below query: select entity_id from table1 exc UNION select entity_id from tabl2 inc On execution, I got 24419 rows. When I execute select entity_id from table1 exc I got 16235 rows and on ...
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77 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, ...
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MySQL: why provide size of a datatype in table definition? [duplicate]

Below is an example table definition: CREATE TABLE IF NOT EXISTS `mytable` ( `id` MEDIUMINT(5) NOT NULL AUTO_INCREMENT, `title` varchar(255) DEFAULT NULL DEFAULT '', `content` text ...
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329 views

statistics State in MySQL Processlist

I have a busy MySQL Server having query SELECT sys_sess_state, index_state, timeout_lvl, last_queued_dt, last_polled_wait_dt, create_id, create_dt, modify_id, modify_dt FROM PQR_AM_SYSTEM_SESSION ...
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MySQL: How logging is useful in performance improvement

My application is facing performance hit. Its a MySQL-5.1.55 version. I am using Windows 2008 dedicated server with 8 GB for the database. There is only one database in this whole system. Till now, I ...
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21 views

MySQL: system variables and status variables related with Disk I/O

How disk I/O is related with MySQL performance improvement. I have a MySQL-5.1.58 based Intranet application equipped with Windows 2008 server and 8 GB RAM. Even, When my application face performance ...
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110 views

MySQL: how to determine key_len and its role in performance improvement of a query

I have a query, below is the structure of the table: CREATE TABLE `jos_tag_rules_fields` ( `id` int(11) NOT NULL AUTO_INCREMENT, `name` varchar(255) NOT NULL DEFAULT '', `label` varchar(255) ...
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39 views

MySQL: How to get locked tables list at a time

Is there any way or any query exist in mysql which list down all the locked tables at a time. I have dedicated Windows 2008 DB server with 8GB memory. In my MySQL5.1 based application, suddenly we get ...
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MySQL: fetch multiple global status and system variable in a single query

When we execute SHOW global status; or SHOW variables; we get list of 291 and 278 records in the resultset. For performance perspective, only few of them are much important. I have to fetch these ...
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MySQl: slow query is not using index in joining

Below is the configuration of my DB server: Apache version : Apache/2.2.22 (Win32) mod_ssl/2.2.22 OpenSSL/0.9.8 PHP version : 5.3.13 MySQL version : mysqlnd 5.1.11 Windows Server 2008 Standard ...
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MySQL process eating up more than 100% cpu resources

MySQL production server taking more than 100% CPU resources when users searching for data or concurrent users login to the server application (Sugarpro). Scenario: 100 concurrent users login VPS ...
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64 views

Help interpreting a MySQL execution plan

I'm trying to understand a slow query. The SELECT has been running (at this moment) for almost 18000 seconds (output from a SELECT on PROCESSLIST): id: 22 time: 17870 ...
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56 views

Understanding how MySQL indexes work

I'm reading this page but I can't get past the following parts: When all tables are processed, MySQL outputs the selected columns and backtracks through the table list until a table is found ...
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378 views

MySQL: High sort_buffer_size setting value

Thing is I was getting plenty of 131104 20:10:36 [ERROR] /usr/sbin/mysqld: Sort aborted with 256M and rather erratic behaviour in my load test. Now at sort_buffer_size = 1024M ...
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query not taking index into account

EXPLAIN EXTENDED SELECT SQL_CALC_FOUND_ROWS SQL_NO_CACHE g.*, u.user_id FROM geotable g JOIN userstable u ON g.uid = u.uid -- corners selection: WHERE (lat BETWEEN ? and ? AND lon ...
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Accidentally I had deleted a database from production server working with MySQL

I have its backup as a full and an incremental backup took using enterprise backup. Is it possible to restore a specific database or else what should I do as an immediate action?
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225 views

Why does max_connections in my.ini not match concurrent connections in Mysql instance config wizard?

MySQL 5.1.x | Windows Server 2003 Can someone please clarify why max_connections in my.ini is much larger than the manual value I specify in the Concurrent Connections Dialogue? For example, if I ...
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coercibility and collations

I have a similar situation as described here - http://forums.mysql.com/read.php?103,63845,63845; basically If I run the query in this SP directly, it executes fine: However, if I execute the ...
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InnoDB data back in 3 months after OS shutdown

I've got an interesting issue last week that after shutting down an instance of mine, all data were back in 3 months (like a big rollback), even though there is no sign of crashing, recovery crash ...
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strange io in mysql server

One of mysql servers becomes slow recently, and I found that there is a high IO in the server: $ sudo pt-ioprofile -cell sizes Mon Apr 29 22:39:32 CDT 2013 Tracing process ID 16934 total ...
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140 views

MySQL “hangs” after every restart.. corrupted tables every now and then.. (5.1.68-cll)

I was seeking an advice in forums about a problem that we face last days. We have a vBulletin forum, we never had any problems in general, but the last couple of days MySQL server hangs and when we ...
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141 views

Mysql query is very slow

I am developing a website like any other social networking site using mysql. I wish it give people suggestion to my users, and I have implemented this functionality in my application, but It is ...
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537 views

How to run a cold backup with Linux/tar without shutting down MySQL slave?

I run the following before tar-ing up the data directory: STOP SLAVE; FLUSH TABLES WITH READ LOCK; FLUSH LOGS; However, tar will sometimes complain that the ibdata* and ib_logfiles* files are ...
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Infinite Loop While Running Query

When I run this query from the command line, it continuously loops. I'm not sure why this is occurring. Could anyone explain this to me, and please offer a fix. I will be using a query similar to ...
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where can I get mysql-5.1.7.tar.gz or mysql-5.1.9.tar.gz? [closed]

I need mysql-5.1.7.tar.gz or mysql-5.1.9.tar.gz, but I can not find them anywhere, who can give me a link to find them, thank you very much!!!