MySQL 5.5 brought many performance enhancements and expanded the feature set of the popular open-source RDBMS.

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Got an error from unknown thread, /pb2/build/sb_0-13157587-1410170252.03/rpm/BUILD/mysql-5.5.40/mysql-5.5.40/storage/myisam/mi_write.c:226

I am using mysql 5.5.40-log and my default storage engine is Innodb, I found this error in my error log "[ERROR] Got an error from unknown thread, ...
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27 views

Does MySQL InnoDB locks multiple rows with READ_COMMITTED isolation level?

I am in trouble while resolving LOCK WAIT TIMEOUT EXCEED error with MySQL InnoDB. I have gone through this article and it says if we use isolation level READ_COMMITTED then my update query should ...
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38 views

Backup a huge database 200gb+

i have a mysql database where i need to take a backup of the log database. the problem is the log database i over 200gb and contains over 280 millions of rows, i need right now to remove a kind of ...
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1answer
18 views

“Remote” connection to a local MYSQL database on LAN

I have a mySQL (5.5.38) server running on my desktop (windows 7), I can connect just fine into any of the servers Users, and skip-networking is off when checked via show variables. I am trying to give ...
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1answer
9 views

MySQL Drop User Fails for Remote Host

We're clearing out some old MySQL users that connected from remote hosts during a database transfer. Why is this DROP USER query failing for the user asdfasdf_imac4? I'm logged in as root. mysql> ...
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14 views

Working with variables in stored proc

I want to create a meta table on the fly using a stored pdocedure and passing a table prefix as "in" parameter and then build the final table name somehow. My code looks like this: SET @table_ = ...
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16 views

MySQL - Get actual precision and scale of number

I would like to query the integer part and fractional part of all decimal(8,4) values in a column. By that I mean, I want to know the actual given values, and not the max allowed by the data type, ...
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35 views

Unknown sticky Problem after MySQL upgrade

few weeks ago we upgraded mysql server from 5.5 to 5.6 on 1st server few days ago (5May) I reboot mysql server , after this customer reported that some database data table not load to their site . ...
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21 views

get the min index of each group of consecutive records

I have a table of records. Each record has in index field. records are inserted sequentially and then individual records are deleted. think of a sequence 1 - 10 and randomly remove 4 numbers I need ...
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11 views

What does mysqltest's view-protocol option do?

The documentation on mysqltest lists this at the bottom of the list of options: --view-protocol Every SELECT statement is wrapped inside a view. What does this option do? Using mysqltest ...
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20 views

Plesk 12 Debian 7 MySQL CPU usage is too high

I have a problem with MySQL and MySQL CPU usage at Plesk. I have a news site with Joomla, and about 100-150 online user. CPU: AMD Opteron(tm) Processor 6366 HE 3 core Memory: 4GB HDD: 250 GB Plesk 12 ...
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26 views

MYSQL Row Count Limits?

What is the maximum row count for a table in MYSQL? I have a system with around 600,000,000 rows in three tables. Average Data Length (from data_length column) for these tables is 58,000,000,000 ...
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14 views

'mysql' database in fresh MySQL installation

I installed MySQL database and according to show databases command I have a database named 'mysql'. Is this database used for holding some internal values for MySQL? In addition, is it possible to ...
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1answer
40 views

InnoDB Index Doesn't Fit in Memory

I am using InnoDB tables in my database and total index_size is 250 GB and my data size is 500 GB. Server has 128 GB RAM, and innodb_buffer_pool_size is set to 64 GB. Data size is increasing every day ...
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30 views

ERROR 1644 (HY000) at line 1852: Unexpected content found in the performance_schema database

I was upgrading MySQL from 5.1 to MySQL 5.6 on a Linux server installed with RHEL6. I already have 5.1 installed and running with about 300GB of database data, so I want to do a in-place upgrade to ...
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29 views

Why is restoration from binary logs so slow?

We have a MySQL 5.5 server with binary logging enabled and a backup script that collects the binary logs and, once a day, generates a complete database dump with mysqldump. In testing database ...
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2answers
59 views

Mysql causing high load average with large amount of server resources left

I've have 2 servers running a application and the server that runs the mysql sgbd is with the load average around 3 times more than the webserver. I think that is something wrong because i have a lot ...
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1answer
19 views

MySQL, can't find MYD files on OS X, MAMP

Try as I may I can't find the data files for my MAMP installation! FRM files are here: /Applications/MAMP/db/mysql/database_name/ but, there are no corresponding MYD or MYI files anywhere. The ...
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1answer
22 views

In slow_log tables, sql_text column showing “throttle: index not used' warning(s) suppressed” instead of exact query

I'm trying to find the slow running queries from slow_log table (as I don't have direct access to server to check slow log file). In sql_text column instead of query it is showing "throttle: index not ...
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1answer
20 views

Indexed varchar column efficiency

On a table with several million rows, with an index on the only column in the where clause (varchar 100, full length indexed), would there be performance gains in making sure that the differences ...
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1answer
35 views

'USE db_name' takes too long to change when login remotely

I gave SELECT privilege to a user on a particular database, Now whenever I try to connect remotely $ mysql -h ip-of-remote -u username -p with that user credentials and try to change the database ...
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36 views

Awful execution plans after migrating from MySQL 5.5.11 to MariaDB 5.5.41

We just migrated our web site database from a server running MySQL 5.5.11 to one running MariaDB 5.5.41. Everything is working mostly fine, except there's at least one query from our storefront that's ...
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111 views

grant select on all databases except one mysql

I have user called test_user created under MySQL 5.5.17 under MS Windows 2008R2, I want to grant this user select privileges on all databases except MySQL database, note I have around 200 database ...
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38 views

how can i connect from yahoo small business webhosting domain to remote mysql server

so far I have done these: set up remote access using Remote Mysql.Added the yahoo website's domain ip and yahoo nameservers. went on to my website on yahoo small business and set up an Aname and ...
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17 views

Unsafe statement written to the binary log using statement format

In MySQL error log I am getting this warning message: [Warning] Unsafe statement written to the binary log using statement format since BINLOG_FORMAT = STATEMENT. Statement is unsafe because it ...
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22 views

Is there an easy way to update a mysqldump file from version 9.11 to 10.11? [closed]

We have a client that has had their servers for soo long, they were still running MySQL 4.0.24. Now that they are refreshing their servers, we took a mysqldump of their current database to put into ...
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1answer
65 views

MySQL overhead of calling a Stored Procedure

Within Java, we access MySQL (v5.5.40) via JDBC -- a prepare statement, setting parameters then calling the stored procedure. It appears that every execute() has the overhead of 4 meta-calls (per ...
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17 views

How to make an indexed search over a list (set)?

A follow-up question for How to most efficiently store possible combinations of categories? An answer pointed to SET datatype. As far as I know, the default search option for it, FIND_IN_SET, doesn't ...
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1answer
15 views

manual transfer fails with table does not exist

I performed a manual transfer of data manually (zip up the dir and rsync'ed it over. I moved the members.ibd (the only .ibd file) to a save place, extracted and then replaced members.ibd with the ...
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801 views

Why are mysql password hashes internally saved with a star (asterisk)?

I was reading upon some mysql internals, when going through the mysql.user table in the my mysql shell, I get mysql> select * from mysql.user limit 1 \G *************************** 1. row ...
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39 views

How to most efficiently store possible combinations of categories?

I have a table of categories (currently with 14 rows, not likely to change). A need to cache combinations of categories emerged, so I'm creating a table of allowed combinations (only few hundreds of ...
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11 views

How to store list data in our LMS?

I am looking at how we can store list information in our database. The example in question is regarding products. For every employee there will be a primary product and as many secondary products as ...
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14 views

Import lots of mysqldumps with missing CREATE DATABASE

I have a bunch of mysqldumps of my old server with one database each. Unfortunately we forgot to add CREATE DATABASE ... in all those dumps. How can I import those files in one batch?
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41 views

Error: Incorrect usage of UNION and ORDER BY

I have this query: SELECT DISTINCT CONCAT (MONTH(`Date`),'-',YEAR(`Date`)) from wp_result_plugin WHERE Bet=2 AND month(`Date`) = EXTRACT(month FROM (NOW())) ORDER BY MONTH(`Date`) ASC UNION ...
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33 views

mysql database under symlinked directory: ERROR 1018 (HY000): Can't read dir of './<dbname>/' (errno: 13)

I'm using mysql 5.5 on an ubuntu linux server. I need to move a database from its current location (under /var/lib/mysql) to a disk with more space, so I attempted to move the directory and create a ...
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1answer
18 views

Can combine five mysql statements into just one statement?

Can I combine all the five statements into just one statement? update mytable set myfield1 = replace(myfield1, '…' ,'-') ; update mytable set myfield1 = replace(myfield1, '‖' ,'|') ; update mytable ...
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28 views

IF statement inside stored procedure, seems to cause locks by side effects

We are running a MySQL 5.5. server with READ-COMMITTED transaction level to store and process a large time series dataset. We have a large time-series-table, into which we write batch updates every ...
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9 views

Optimizing MySQL for write throughput ceiling

We have a large MySQL database on AWS RDS, with a huge table around ~1.8TB with massive write workload. We recently hit a write throughput bottleneck, which caps our provisioned IOPS way below the ...
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11 views

creating best results from two tables

I have two tables, one is the results of an assessment from users(per row) and column starting with 819....X1 represents the qid. The other table holds the score for the answers (A1,A2,A3), both are ...
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35 views

Tunning MySQL Variables

we have a dedicated mysql server with 10 CPU and 32G of memory After doing some readings came up with those configs : # This was formally known as [safe_mysqld]. Both versions are currently parsed. ...
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2answers
32 views

Get rows where lastLoginTimestamp is in last 7 days

I'm trying to get the rows from a table where lastLoginTimestamp is in last 7 days and I'm doing as follow: SELECT * FROM representative WHERE DATE_SUB(lastLoginTimestamp, INTERVAL 7 DAY) ...
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1answer
28 views

phpMyAdmin and mysql not showing the same database

I have setup WAMP which I managed by using a tutorial and everything seems fine... I am logging into mysql as the root user with full privileges granted and I am able to create databases in mysql and ...
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1answer
35 views

MySQL Crash After Starting Binary Logs

Recently I have added binary logs to mysql to start replication but after that setting, mysql process failed to start and keep crashing constantly. In mysql error logs some messages are there but not ...
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1answer
27 views

Unable to get the latest value added to Mysql table based on posted time

SELECT * FROM discussion_comments GROUP BY disc_id ORDER BY posted_date DESC I have table example like given below: CREATE TABLE example ( id int(11), cname varchar(11), posted_date date, ...
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43 views

MySQL is pretty slow after 50-100k rows whats happen?

i have trying now a lots of time, and i try to find a way there make sense to find out of my problem, but this problem stil make a lot perfumes issues. i testing it of on a developer server ( 2 ...
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21 views

Installed Percona-Toolkit, but no sign of xtrabackup

I've installed Percona-Toolkit on my Debian (Wheezy) test Server, using dpkg -i percona-toolkit.deb apt-get install --fix-missing -f dpkg -i percona-toolkit.deb However, there is no sign of ...
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26 views

“show procedure status” displaying the non existing databases stored procedures in mysql server

i have taken a mysql server backup using mysqldump and imported the backup file in another mysql server.Import failed because of disk full issue. Only 11 databases are created out of 15 . when i issue ...
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No records in Mysql.func table even though there are stored functions in server

When i am creating a user defined function in one of my mysql server, it's not creating any row in mysql.func table . Even though i have multiple functions in my mysql server , this table is empty . ...
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How to create relations in database

I have two table: users and projects. In projects admin can add projects like: web design, SEO , etc.... I need to add abilty to admin can add some users to certain project... For example I need ...
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25 views

Mysql Trigger to call a java method, its pros and cons?

I have a requirement to call a Java method once a new record has been inserted in to the DB. I would like to know is it a efficient way to do ? what could be the performance issues as my table expects ...