MySQL 5.1 : The Second Major Release of MySQL 5

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mysql trigger to insert/update date column from datetime column

probably simple question but can't get it to work: I have a table with two datetime columns. In order to set up a date index and have simpler queries, i have added two date columns next to them. ...
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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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204 views

UPDATE SET REPLACE() matches but does not change

I've seen another post about this exact thing but it's 1-1/2 years old so I thought I'd make my own...besides, the other post did not help me. What I am trying to do is pretty straight-forward. To ...
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46 views

mysql's query cache behaviour on LIMIT

Is it accurate to assume that MySQL's query cache gets checked on subsequent execution of queries in the form SELECT ... WHERE ... LIMIT x, y where the the only varying paramaters in the query are x ...
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102 views

Out-of-Range and Overflow Handling for float values

am using mysql 5.5 log version with sqlmode='' .I have many columns with float(9,3) as the type. Say for ex one column taxvalue (9,3) Currently if the user enter the value above 999999.000 MYSQL ...
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125 views

Why would one use the Innodb Plugin instead of the builtin Innodb in Mysql 5.1? (GPL)

Innodb works in Mysql 5.1 whether or not the innodb plugin, ha_innodb_plugin.so is loaded at startup or not. Configuration dependent of course. What are the advantages and disadvantages of either ...
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120 views

Index for ORDER BY on aggregate in MySQL

I'm working with the following query: SELECT *, SUM(entries_count) AS entries_count FROM leads WHERE promo_id IN (1, 2, 3) GROUP BY user_id ORDER BY entries_count DESC LIMIT 25 OFFSET 100; It's ...
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229 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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35 views

Calculating the number of times a group occures

I'm trying to figure out how many times in my database a particular grouping has occurred. I have two relevant tables. mysql> describe logins; ...
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82 views

Upgrading MySQL 5.1 to 5.5 - All tables gone [closed]

I'm trying to upgrade from MySQL 5.1 to MySQL 5.5. I followed the instructions here: http://dev.mysql.com/doc/refman/5.5/en/windows-upgrading.html I also adjusted the Datadir. But after the upgrade, ...
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64 views

Best way to handle temporary data

Say I have a table prices. Users can see the prices of this table (I'm simplifying it). Users also can send prices to the server, so the server is going to collect these data in another table ...
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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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47 views

Conditional Counting

I'm analyzing a database of login records for a university and I'm trying to write a query that will give me an idea as to how many users are using the labs for short bursts, verse a more extended ...
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why is this query taking so long?

+----+-------------+-----------+----------+---------+------+----------+--------------------------------------------------------+ | Id | User | Host | db | Command | Time | State | ...
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946 views

Upgrading MySQL 5.1 to 5.5 on Centos 6 without removing dependencies

I'm trying to upgrade MySQL 5.1 to 5.5 using yum/rpm combo (yum to remove MySQL 5.1 and rpm to install MySQL 5.5). Most instructions I've found suggest to do first: yum remove mysql mysql-server ...
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579 views

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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70 views

MySQL Function Error

In an inherited database I have two tables of current interest, records and logins. login tells me the location of the user and where and when his login occured (in and out times included). The fun ...
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248 views

Is it safe to kill ANALYZE TABLE query on a MyISAM table?

I have a huge MyISAM table that is blocking my application. I frequently find ANALYZE TABLE queries running on that table. I guess that's because a join is being performed on the table or at least an ...
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98 views

Fulltext search returning too many rows

Server: MySQL 5.1.66-0+squeeze1 My problem: I have two databases with the same tables. One is for the testing environment and one for production. When I perform a MATCH AGAINST on the prodution ...
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670 views

MySQL ERROR 1137 (HY000) at line 9: Can't reopen table: 'temp_table'

I'm receiving an error ERROR 1137 (HY000) at line 9: Can't reopen table: 'temp_table' when executing a query similar to the following: USE database_name; CREATE TEMPORARY TABLE temp_table (status ...
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95 views

Is there any query to fetch the a single row data in chunks?

The data stored in a row is just like "Phone Number:--- xxxxxxxxxxx Call Type:--- MISSED Call Date:--- 2013-06-13 Call duration in sec :--- 0 Phone Number:--- xxxxxxxxxxx Call Type:--- OUTGOING Call ...
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283 views

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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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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1answer
3k views

How to solve “The table … is full” with “innodb_file_per_table”?

I have a MySQL database that holds a large amount of data (100-200GB - a bunch of scientific measurements). The vast majority of the data is stored in one table Sample. Now I'm creating a slave ...
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How can I get this query to use it's index?

Queries matching this query below shows up in the slow log (with different contentVersionId & modifiedDateTime). As I don't really know what I'm doing I tried adding indexes to all columns in ...
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132 views

Problem in Fetching Result set in Desired Format

I have 2 tables having the following columns Person ------ person_id, first_name, middle_name, last_name Items ----- person_item_id, person_id, item_type, status, ordered_date The query is ...
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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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Mysql Forcing close of thread 946 user

My mysql box keeping shutting down and up. Below is snippet of the log file. There is quite a number of places I notice this Forcing close of thread 946 user: 130426 12:36:28 [Note] Event Scheduler: ...
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130 views

Is there a way to recover this database (MySQL)

I did a "cold" (db offline, all filesystem files) backup of a MySQL db. I wrote the backup to an ISO image. Unfortunately Joliet filenames are not default. I didn't realize that until attempting to ...
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3answers
538 views

Can I make sure two columns dont have the same value

If I have a table that looks like this CREATE TABLE foo ( id INT NOT NULL AUTO_INCREMENT, aa INT NOT NULL, bb INT NOT NULL, PRIMARY KEY (id), UNIQUE KEY (aa, bb), CONSTRAINT aa_ref ...
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142 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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74 views

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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716 views

Innodb Slow queries since convert from MyISAM

a few days ago we converted some write intensive tables from MyISAM to InnoDB hoping to have a better performance due the better locking system of InnoDB, but instead of gain performance, we start to ...
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218 views

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!!!
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Adding a user to MySQL with 'name'@'%' fails with ERROR 1396

I just tried to add a new user to MySQL using CREATE USER 'name'@'%' IDENTIFIED BY '...' However, it fails with the following error: ERROR 1396 (HY000): Operation CREATE USER failed for ...
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1answer
150 views

How can I disable utf8mb4 entirely on MySQL 5.5?

I know you're not supposed to do this, but I have a MySQL 5.5 master and a MySQL 5.1 replication slave. That's supposed to be okay, unless I do something stupid like use utf8mb4 that isn't supported ...
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249 views

What would cause Mysql database entries to be truncated to 253 characters?

Randomly seeing database entries truncated to 253 characters on a php site and can't figure out why or if it could be malicious or a corruption issue. Any thoughts would be appreciated.
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789 views

MySQL: Can't find record in tablename

After crash: mysql> repair table lot_not_sold; +------------------------+--------+----------+---------------------------------------------------------------+ | Table | Op | ...
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3answers
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Automatic MySQL Replication Fail-over Strategy

I want to know that if replication is down due to some reason as if master is down then what strategy should be followed so that the replication is up instantly without manually intervening the ...
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1answer
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How soon after updating expire_logs_days param and restarting sql will old binlogs get deleted?

MySQL 5.1.x | InnoDB | Windows My mysql data directory is starting to fill up with bin logs. I currently have the following settings configured in my windows mysql server: [mysqld] log-bin ...
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1answer
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Is there a progress indicator for OPTIMIZE TABLE progress?

MySQL 5.1.4x (Windows) | Innodb I recently purged data from a mySQL DB (a few hundred thousand rows) and I'm planning to use OPTIMIZE TABLE LOGTABLEFOO1,LOGTABLEFOO2,LOGTABLEFOO3; to reduce the ...
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611 views

How to properly secure MySQL database?

We have a web application based on the famous triad apache + php + mysql which we sell to our customers and gets installed on their servers. Currently, we are using MySQL 5.1.41 which has only a ...
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147 views

mysql freeze/crash on JOIN

here is query: SELECT nw.news_id, nw.title, nw.description, nw.url, nw.date, nw.image, nw.status, src.title as src_title, src.keyword as src_keyword, src.url as src_url, src.icon as ...
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135 views

Database instance keeps restarting

From the past few days, our MySQL database instance has crashed and had to be restarted a few times. My MySQL version is 5.1.57-log. The CPU and memory usage was way below 50% during the crash time. I ...
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1answer
996 views

Take individual MySQL database offline

MySQL does not have any SQL commands or internal mechanisms for making an individual database unavailable / offline moving an individual database Thtis being the case, how can you take an ...
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541 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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298 views

My SQL server showing different result with same query execution at different time

When I execute below query from MySQL server, it shows me different output for each time even though database is stable and not used by anyone except me. SELECT TABLE_NAME , table_rows FROM ...
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Why does max_used_connections status not get refreshed automatically once it reaches max_connections, even though the Threads_connected falls down

I always wonder, why does the max_used_connections value not come down, once it reaches the peak value of max_connections? I always flush the status and bring down this value to avoid DB connection ...
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Can I do anything about a very long running KILL command?

I've got a table with 103M+ records in it and takes up 70GB on the disk. I decided to DELETE (in one statement) 70% of the records. As expected, this took an awfully long time to run. I decided to ...
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902 views

Retrieve double data type value in non exponential form

Is it possible to retrieve non-exponential value in double data type column? After the width of the column is increased to 15 it shows the values in exponential form. Now I get the following: ...