MySQL version 5.5 - please also tag with mysql for search purposes.

learn more… | top users | synonyms

0
votes
1answer
22 views

MySql DB from Ubuntu to RHEL

I would like to migrate my Mysql databases from Ubuntu to RHEL..what is the best way to proceed? I'm on community edition. I will be moving to entreprise edition of MySql on RHEL.
1
vote
1answer
117 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 ...
1
vote
1answer
138 views

Migrating mysql.user table from MySQL 5.5 to MySQL 5.6

I have a tricky question. I am migrating from MySQL 5.5 to MySQL 5.6. I want to migrate 45 users in MySQL 5.5 to MySQL 5.6 Questions Should I just take a dump of the MySQL 5.5 user table and ...
1
vote
2answers
192 views

Should I stop an awfully inefficient MySQL DELETE statement?

I'm running the following statement on MySQL 5.5 in a 1GB 1CPU SSD virtual machine from Linode: DELETE table FROM ( SELECT MAX(id) id, field FROM table GROUP BY field ) temp_table INNER ...
2
votes
1answer
187 views

Mysql can't start?

Mysql can't start, here is the log : 150708 06:28:36 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql 150708 6:28:36 [Warning] Using unique option prefix key_buffer instead of ...
1
vote
1answer
71 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 ?
0
votes
1answer
159 views

How to Upgrade Master Slave MySQL on AWS RDS?

I already have Master Slave configuration on AWS RDS. We want to upgrade 5.5 to 5.6.23. ..What should be correct sequence to Upgrade ? 1. Upgrade Master ( Using Modify Instance ) --> Upgrade Slave 2. ...
5
votes
1answer
3k views

Percona mysqld got signal 11

I've googled and searched stackexchange, but can't find anything relevant to this particular issue (there are other error 11 issues, just not for this as far as I can tell). We have a server that is ...
2
votes
3answers
93 views

How to show multiple names for one record but not duplicate the record?

I have a database structure like so: Car - id - carname - image - category - status Parts - partid - partname CarParts - carpartid - carid(fk) - partid(fk) - amountid(fk) Category - ...
1
vote
1answer
194 views

MySQL Read/Write Benchmark

I'm trying to benchmark Read/Write speed in MySQL 5.5. Currently I have a stored procedure that insert rows with random numbers to a table and I'm measuring time of execution before and after ...
1
vote
2answers
305 views

mysql master slave replication scenario

We are creating a new mysql slave, but for dump we are taking from a backup server which is a slave of current master. Now to enable replication we want to connect it with the master so should I take ...
1
vote
1answer
2k views

what could cause a mysql process to close (clean)

We are using mysql master-master (version 5.5.32) for an API manager called Layer7. The 2 hosts holding the instances are in the same ESX From time to time we have mysql doing a clean shutdown for ...
0
votes
2answers
95 views

Killing a process without login to MySQL

Here is the situation: I was running a very complex query on a database which was expected to execute within a few hours over night(server configuration is not good and data set is large). This ...
1
vote
0answers
50 views

Delete using join or using sub-query?

I need to delete rows from a table based on what is present in a temporary table. For me, both of these statements work : DELETE from main_table where `id` in (select `deletable_id` from ...
1
vote
1answer
42 views

MySQL: Incorrect binary log format - OFF.000

I have a Percona MySQL 5.5.30 as a master(Debian 6.0.7). I got a weird issue that all my binary logs started saving in format OFF.00* instead of the specified format in .cnf file. mysql> show ...
0
votes
0answers
109 views

pt-online-schema-change with statement based replication in MYSQL

Is it possible/safe to use pt-online-schema-change in a Master slave environment where as the way replication is setup is statement based(SBR). What is the better way of doing it as currently I have ...
1
vote
3answers
231 views

Index optimization and cardinality

I'm by no means a DBA expert. Rather, a Magento developer having to troubleshoot some slow queries. I'll jump right in -- here's my attempt to EXPLAIN the troublesome query: EXPLAIN SELECT `s`.`...
0
votes
1answer
274 views

Non-Replicating commands from (master) Mysql 5.5.40 to (slave) MariaDB 10.0.19

CRUD replicates just fine. But we noticed that DB structure altering commands such as ALTER TABLE and/or adding/updating columns to a table and even creating new ones do not replicate to the slave at ...
0
votes
0answers
54 views

Index pages in innodb file when innodb_file_per_table = ON

I have MySQL 5.5, and innodb_file_per_table was always in config file. After some time of using MySQL DB was produced big ibdata1 file, but i don't know how explain why this file is so big, i try to ...
1
vote
0answers
765 views

Reclaim disk space after dropping table(innodb_file_per_table = ON), strange scenario

I know it is often asking question. But I can't find answer for my scenario with specific condition. We use MySQL 5.5 We have always(I am sure) innodb_file_per_table = ON option in our mysql ...
1
vote
2answers
239 views

Difference between Handler_write and Innodb_data_writes

Handler write is the number of requests to insert a row in a table. InnoDB data writes is the total number of data writes. Questions are Does inserting a row count as a disk write? If I do an ...
0
votes
2answers
282 views

Fixing MyISAM database without losing data

My old server was crashed but I was able to recover the databases from MySQL through testdrive. I'm trying to dump a database using mysqldump but it gives error for certain tables are crashed and ...
0
votes
0answers
47 views

MYSQL taking 17.5 GB of RAM

This is what top shows how MySQL is taking a large amount of memory. VIRT RES SHR S 3967 mysql 20 0 17.5g 1.4g 7008 S 41.2 2.3 17426:16 mysqld this is ...
1
vote
1answer
161 views

How to speed up query containing concat() in WHERE clause?

In my company we use a commercial software running with mysql 5.5 (MyISAM) that often executes a query of this form: SELECT table1.attrib1 FROM table2, table1 WHERE table2.status = 'Active' ...
0
votes
0answers
51 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 ...
0
votes
1answer
84 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 ...
2
votes
1answer
332 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 ...
1
vote
1answer
98 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> ...
0
votes
1answer
104 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_ = ...
0
votes
0answers
58 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, ...
1
vote
1answer
125 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 . (...
0
votes
0answers
318 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 ...
0
votes
2answers
900 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 ...
0
votes
1answer
19 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 ...
0
votes
1answer
405 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 ...
1
vote
2answers
185 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 ...
1
vote
2answers
818 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 ...
1
vote
1answer
188 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 ...
1
vote
1answer
173 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 ...
1
vote
1answer
26 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 ...
0
votes
1answer
293 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 ...
1
vote
2answers
145 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 ...
1
vote
2answers
3k 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 ...
1
vote
0answers
72 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 ...
2
votes
1answer
227 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 ...
5
votes
1answer
675 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 ...
1
vote
0answers
26 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 ...
0
votes
1answer
90 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 ...
8
votes
2answers
2k 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 *********...
0
votes
2answers
220 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 ...