MySQL 5.1 : The Second Major Release of MySQL 5

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1answer
216 views

Do triggers affect DB performance

I have a database with 250 small and medium sized tables. These tables are related with both MyISAM and InnoDB storage engines. There are multiple triggers that have been created on different tables. ...
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3answers
248 views

How to update cust_id from Customer table to order table Cust_id field while inserting customer name using trigger

I have two tables 1. Customer_details and 2. Order_details. 1.Customer_details table -->fields--> Cust_Id(Primary Key) and Customer_Name, 2.Order_details table --> fields-- Ord_Id(Primary ...
2
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1answer
4k 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 ...
2
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1answer
369 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 ...
2
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1answer
568 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 ...
2
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1answer
152 views

Find MySQL Patch Level

What command do you use to find the patch level of MySQL? I am currently on 5.1.73. I need to find out what patches have been applied to this database. Thanks...
2
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1answer
4k views

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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0answers
594 views

mysql pre-start process (23901) terminated with status 1 [closed]

I installed a new Mysql server version 5.1 on machine which was running on 5.0. Now when I try to start the mysql server using command service mysql start it gives me an error start: Job failed to ...
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0answers
249 views

why is MySQL 5.1 on ubuntu 10.10 not starting? [closed]

I just installed a MySQL 5.1 server on Ubuntu machine. after installation the server should automatically start but it does not start and gives me an error start: Job failed to start . Even when I ...
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2answers
2k views

Difference between show status and show global status in mysql

When I execute "show status" and "show global status" in MySQL at interval of 5 seconds , I got set of 291 results each time. But, value of some parameters are different. Below are the list of those ...
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1answer
133 views

Help Optimizing Query

For the following table structure in MySQL 5.1.49: CREATE TABLE `leads` ( `id` int(10) unsigned NOT NULL AUTO_INCREMENT, `institution_id` int(10) unsigned NOT NULL, `lender_id` int(10) unsigned ...
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3answers
4k views

How do you install MySQL 5.1.34 on CentOS 5.5?

I am trying to install Mysql 5.1 on cent OS. I researched a lot but could not find any link which gives step by step procedure. Everywhere, there are vague answers. Can someone please give me steps ...
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2answers
740 views

Mysql master-master permission replication issue

I came to know it's safe to replicate mysql database to have the users and permissions replicated, from a post in ServerFault is-it-ok-to-replicate-mysql-db. I have setup master-master replication ...
1
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1answer
59 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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3answers
258 views

getting error while starting memecached service with ndb engine

i am installed memcached library by following the steps in the internet. now there is a binary file created in bin folder of mysql now i exicuting the command memcached i am getting error like this ...
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2answers
767 views

MySQL views and table locking (5.1 MyISAM)

I have a large (160 million rows, 50GB) table in MySQL 5.1 using MyISAM. If I were to construct a view defined by a fairly complicated query, would a SELECT on the view lock the underlying table?
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2answers
402 views

Mysql select ends with 'killed'

Okay, I'm sure this will turn out to be something dumb, but then I'm a dumb n00b DBA. I've got a largish table, about 163 million rows and something like 44 GiB. After some experiments with ...
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1answer
551 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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1answer
8k views

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 ...
1
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1answer
16k views

Error Code: 1205 Lock wait timeout exceeded in MySQL

I have set InnoDB lock wait time-out to 120 seconds. When I run the query below for first time, it works fine. However, the second time, the same query with a different value gives me: Error ...
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2answers
80 views

Master/Master/Slave Replication

Just trying to get some information on the best route to setup replication for this DB I've got. I'm using MySQL 5.1 I found this and it seems like the idea we have in mind. We're looking to have ...
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2answers
113 views

Fourth inner join to the same table increases query duration significantly

As soon as I add a fourth inner join to a specific table, the query duration increases significantly: sub 1sec to 45sec. The table in question is deployments d4. The SQL Query: select a.id as ...
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1answer
141 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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1answer
160 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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1answer
1k views

Solutions to 4-byte utf-8 characters in mysql 5.1

I'm running into a problem that seems to be an issue w/ mysql 5.1s limitations on UTF8 characters. From http://dev.mysql.com/doc/refman/5.1/en/charset-unicode-utf8.html Currently, MySQL support for ...
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2answers
525 views

Lost connection to MySQL server during query

Here is a part of my query SELECT * INTO OUTFILE 'Target_File_Name' FIELDS TERMINATED BY ',' OPTIONALLY ENCLOSED BY '"' LINES TERMINATED BY '' FROM (SELECT 'Start time','Calling no','Called ...
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2answers
392 views

why can I only install MySQL 5.1 on cent OS 6.2?

I had Ubuntu 10.10 on my server and MySQL 5.1 version. But since i wanted to update the system, I installed a fresh version of Cent OS 6 only so I could install the latest version of MySQL. But after ...
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2answers
3k views

How to install MySQL 5.1 on Ubuntu 10.10?

I researched a lot but could not find any link which gives step by step procedure. Everywhere, there are vague answers. Can someone please give me steps to be followed to install Mysql 5.1 ? It gives ...
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2answers
2k views

Client to use the slave when the master is down in MySQL replication

Is it possible for the client to use the slave when the master is down in mysql replication? I have already setup a simple mysql replication having a master and a slave. The client connects to the ...
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2answers
944 views

How to eradicate Mysql Slave Replication delays when huge updates from master

At my environment we had slave replication with mysql server version 5.1.47 enterprise version.When ever there is huge updates from master, slave is lagging behind the master. What is the best ...
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1answer
1k views

Problem with MySQL Master/Slave reboot when in replication

There is a master and number of slaves connected to it. Due to some patches, we have to Reboot the Master and Slave. Afterwards, we have to make sure replication is running fine. While doing this ...
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1answer
36 views

Windows crashes on doing sql dump [closed]

Windows simply crashes and opens the blue screen for dumping physical memory on trying to import sql dump. Blue screen error: IRQL_NOT_LESS_OR_EQUAL So far I have tried 4 methods: Through workbench ...
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1answer
64 views

MySQL: OPTIMIZE TABLE vs. myisamchk

I have a very large table (~50GB) and periodically rows are purged from it and I want to run OPTIMIZE TABLE to recover the space. But I do not have enough space to run it. If I do run it the server ...
1
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1answer
44 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 ?
1
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1answer
113 views

set global variable parameter?

My prod_server version is 5.1.47 and want to set the slow query log dynamically for certain period of time. I refered one site(http://toastergremlin.com/?p=276) there is mentioned below 5.1.6 we need ...
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2answers
202 views

One to many join, Sum from both table

I have two tables: orders and ordersdetail...(partial table) orders- id(primary key), amount, date( index) orderdeails- id(primary key), skunitid, quantity, order_id Each order has multiple order ...
1
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1answer
105 views

Using pt-table-checksum to compare a slave's DB to another slave

I understand that pt-table-checksum can do checksum compares between a master's DB and a slave's DB easily. However, let's say your master has two slaves replicating from it for the same DB, i.e. ...
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1answer
40 views

Do threads in cache still use memory?

I was studying about how and how much memory allocated to each connection thread and found below MySQL tutorial: http://dev.mysql.com/doc/refman/5.1/en/memory-use.html There is a point mentioned as ...
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1answer
36 views

MySQL Replication Between Three Hosts?

We have a need to move our Moodle server to a different host, and our current host runs a LAMP stack that likely runs on a VM. It is accessed most of the time. In the event that the current host ...
1
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1answer
947 views

MySQL replication error 1594

Is there a way to restart replication without going over MySQL :: MySQL 5.1 Reference Manual :: 16 Replication. I'm NOT seeing ANY errors on master and I'm not entirely sure why slave is ...
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1answer
110 views

What does this mean - ~/.my.cnf

When I run $ mysqld --verbose --help | less I got information like Default options are read from the following files in the given order: /etc/mysql/my.cnf /etc/my.cnf ~/.my.cnf As per my ...
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2answers
2k views

Does MySQL have a version of Change Data Capture?

We're in the process of phasing out an old system and migrating onto a new one. The last time that we phased out an old system, we ran both systems in parallel and integrated data between both until ...
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1answer
26 views

Unable to start mysql

I am using Oracle LINUX5. I installed MySQL 5.1.73 community edition through RPM command and it was working. Now, I stop mysql by running below command: $ mysqladmin -u root -ptmpassword shutdown I ...
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1answer
2k views

MySQL master master replication, safe to delete rows on both masters?

We have a MySQL (v5.1.61) cluster with two masters (and two slaves). We have a table logs with a primary key column logID. This log table grows rather huge, and we'd like to delete data from it. So ...
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1answer
537 views

Different thread states in query execution

My MySQL 5.1 based Intranet system is facing very bad performance during high load. When observed through MonYog, I found below thread states: We can simply understand the different thread state by ...
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1answer
156 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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1answer
8k views

Selecting multiple columns from multiple rows in one column (subquery?)

I'm working with MySQL 5.1.68. I have a situation where I'd like to select rows from another table into a column. I'd like to output this: id # name # citizen_name (multiple citizen names) 1 # ...
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1answer
6k views

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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1answer
1k 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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1answer
142 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 ...