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

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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 ...
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27 views

Replication Error_code: 1032

I an unable to fix this as I don't know what cause this error. Replication was stoped for maintenance activity and after completing the maintenance we started it and then after some point the ...
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2answers
9k views

MySQL equivalent of WITH in oracle

Is there a MySQL equivalent of the WITH clause in Oracle?
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1answer
211 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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2answers
114 views

View active MySQL connections per user

I need a query that will give me the active or open number of connections to a certain database for a certain user. I have been searching for hours and have come up with nothing so far. I am close, so ...
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1answer
108 views

Finding out the exact size of the database after inserting records?

I have this query: SELECT table_schema "db.name" , Round(Sum(data_length + index_length) / 1024 / 1024, 1) "DB Size in MB" FROM information_schema.tables GROUP BY table_schema; Does this ...
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116 views
+100

Mysql 5.5.45 crashing after refreshing web page rapidly(Too Many Connection warning)

I am using ec2 aws instance for my wordpress webiste.after every 5 to 10 minute and randomly my website going down i tried lots of things like increasing buffer memory ,memory limit but that not ...
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13 views

why database show vulnerable column when i give a wrong parameter in query? [on hold]

When we try for inject a website for find vulnerable column then sometimes we need to give a wrong value in the website parameter. Like www.vhul-web.com/index.php?id=1 union select 1,2,3 -- - Now ...
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1answer
329 views

Stuck in “query end” status every 5 minutes

I'm sick of seeing data in the slow query log, so I decided to check out what the fuss was all about. An UPDATE query that is running up to tens of times per second is sometimes really slow. Here is ...
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29 views

Slave not getting replicated SERVER_UUID error

Unable to start replication Master-Slave, I have searched a lot for this but unable to get the Server-UUID of both the server. Do we have any solution for this. Scenario: I have created new slave ...
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29 views

Is double one to many a bad design? It looks duplicate when joining both one-to-many tables

Suppose I have user table, book table, DVD table. User can borrow n book, n DVD at the same time, a book or a DVD can be borrowed by a user. (I understand it is many-to-many situation in real life, ...
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17 views

Mysql Replication break Error_code: 1032

Created new slave replication, it was working fine but suddenly after 2 days its giving me this error and the replication stopped. Both on Centos 6.7 Master Version ...
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1answer
52 views

MySQL replication - invalidating query cache entries (table)

We lately moved to MySQL V5.5 on CentOS release 6.7 with master and 2 slaves. Since then the replication process lags a lot behind the master with the line in the process list of: invalidating ...
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1answer
126 views

Mysql Tuning for a small server

I have a small Cloud Server running under Ubuntu 2 core, 2GB ram and 2GB swap, with Plesk Panel, Apache, Nginx as reverse proxy and Mysql 5.5. I have about 18 domains hosted here and each domain has ...
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1answer
126 views

MySQL - Enabling Scheduled Event on Master and Slave Simultaneously

This may seem a bit strange, but I am trying to get a Scheduled Event to execute on both Master and Slave. I have two databases set up in a Master (A) to Master (B) replication environment. Master A ...
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3answers
684 views

Finding differences between a master and slave when pt-table-sync fails

I have a table that's showing some differences on a master and slave according to pt-table-checksum (PTC). I've found some verifying differences beyond that. Certain tables in the mix have composite ...
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18 views

MySQL replication Got fatal error 1236

I am getting this error when starting a new slave replication from master. Last_IO_Error: Got fatal error 1236 from master when reading data from binary log: 'log event entry exceeded ...
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1answer
59 views

Restoring MySQL dump ERROR 1449

I took hot backup (dump) from my Master MySQL DB with below command mysqldump -uroot -p --skip-lock-tables --single-transaction --flush-logs --hex-blob --master-data=2 -A > ~/dump.sql ...
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36 views

Using SSL produces error “protocol version mismatch”

Using MySQL Server (5.5.46-0) on Ubuntu 14.04.2 with protocol version 10. Configuring SSL and defining SSL cert files locations in My.cnf file. Have defined absolute paths for CA-cert.pem, ...
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2answers
531 views

Mysql improve Self join performance large table?

I have a task to help identify conflicting IP ranges , I want to highlight when one companies IP range falls within another's ... below is the sample table, I have converted the IP ranges from .dot ...
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1answer
15 views

Mysql Replication backup and restoration failed multipal time

I tried restoring MySQL backup several time but unfortunately it gets failed by some or the new reason. I have 2 host Master & Slave with below details. Server1_Master os-centos6.7 mysql- ...
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1answer
307 views

Data Analysis with MongoDB or MySQL

I have a need for processing some data in order to come up with some statistic. This is the scenario: Each user can answer several questions from the question list. They pick their answers from a ...
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2answers
367 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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1answer
292 views

Is it a waste to set innodb_buffer_pool_instances greater than the # of CPUs?

I set the innodb_buffer_pool_size to 20GB on a server with 12 CPU cores. My full database is 11gb, however most of it is archived tables that are almost never used. The total queried data is around 3 ...
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234 views

How to access another Connect server table in my Local server in SQLyog 7.01?

In same server name using same database select * from area;(Working Good) Same Servername but Different Database select * from mysql.event(Working Good) Now i am connection TWO Different server ...
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211 views

mysqldump 5.5.25 use swap instead of memory

mysql version 5.5.25, while use mysqldump to dump big tables, it eat lots of swap while there is lots of free memory. # free -m total used free shared buffers ...
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1k views

Mysql closing immediately after new installation

I am using mysql as an backend for my webapp ,the software ran without any glitch but today it gave unexpectedly ERROR:2003 i tried many solution on the internet but none worked. so reinstalled the ...
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1answer
502 views

Strange Locking issues while playing back logs via percona playback

Problem while replaying logs I am in the process of benchmarking a new DB node (specs at the end) and have run across some strange behavior: As described here i: Created a dump (innobackupex ftw) ...
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3answers
67k views

ALTER TABLE - Rename a column

This got me nuts! I want to rename a column from read-more to read_more in blog table Tried all this: ALTER TABLE blog RENAME COLUMN read-more to read_more; ALTER TABLE blog CHANGE COLUMN ...
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1answer
457 views

Restrict access to rows by usename

In my database i store data of different users (e.g. addresses or invoices) in the corresponding tables. I want to make sure that a logged in user only has access to it's own data in the tables (so ...
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1answer
1k views

Convert Oracle Query for Date to Mysql queries

Need to convert the following oracle queries to MYSQL queries. 1) select to_char(to_date(?,'DD-MM-YY')) from dual; 2) select to_char(next_day(to_date(?,'DD-MM-YY'),'FRIDAY')) from dual; 3) ...
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0answers
46 views

MySQL: Is the read committed isolation level safe with mixed binary log format?

When using the MIXED format with the READ COMMITTED isolation level, am I safe? The docs state (http://dev.mysql.com/doc/refman/5.5/en/set-transaction.html#isolevel_read-committed) If you use ...
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65 views

Join on with modified ON

I am trying to create table with summary of few other tables. All solutions i came up with are very slow and clearly not optimal. Initially I tried with multitude of subqueries but that was very slow. ...
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2answers
129 views

Large query with subquery runs indefinitely after mysql update

We recently did a big server update, in the process migrating from mysql-5.0 to 5.5.40 Several of the queries, which had been running well on the old server, now grind everything to a screeching halt. ...
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1answer
37 views

MySQL optimizer difference between 5.6.27 and 5.5

We've just updated the MySQL version of the database of one of our clients from the 5.5 to the 5.6, everything is working fine except one simple query which is causing us troubles. Having the ...
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1answer
153 views

How to only display a variable in PHP inside a MySQL query when it has a content or when a condition is true?

How do I only display $mon or any variable when it has content? whenever i use this syntax and for example, monday must contain the number 1 and tuesday would contain number 2 and the other ones have ...
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429 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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621 views

MySQL users corrupt

I have a strange situation here: From time to time I cannot log in with any of my mysql users. I even cannot make a mysql dump. So I started searching in mysql files and I found that users.MYD and ...
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1answer
33 views

why my MySQL binary log file size is so small?

I have a lot of small binary log files , each of them just only 126 Bytes -rw-rw----. 1 mysql mysql 126 Jan 6 16:13 mysql-bin.000001 -rw-rw----. 1 mysql mysql 126 Jan 6 16:16 mysql-bin.000002 ...
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16k views

Cannot configure nor start MySQL

On a brand new Kubuntu 14.04 install, I ran sudo aptitude install mysql-server-core-5.6. The install could not complete due to dependencies of some KDE packages on mysql-server-core-5.5, which would ...
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1answer
172 views

Too much IO to MySQL InnoDB log files

I am using MySQL version: 5.5.38 I have dedicated HDD to InnoDB log files using innodb-log-group-home-dir option. atopsar -d 30 shows big load (>50%) to this HDD The thing is that I have only 75 ...
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1answer
162 views

installing mysql 5.1 alongside mysql 5.5

mysql 5.5 is installed. I need 5.1 to install an old website so it can be updated. The installer refuses to let me install onto the disk with 5.5. I don't have any other disks. I downloaded the ...
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126 views

change character set in mysql permanently

I want to change following parameters to utf8mb4 so that mysql can store emoji characters and special language characters. but when i try running following statements one by one SET ...
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1answer
754 views

Change MAMP to use a lower Mysql 5.1 version

I need to have the same development environment for my PHP program. My clients test server is running on Mysql 5.1 while my local is using MAMP running Mysql 5.5. How do downgrade my mysql database ...
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1answer
14 views

load data infile in mysql server 5.5 can't load data when foreign key exist

I have a database (TPC-DS benchmark base) with 24 tables(17 dimensions tables, 7 facts tables) I generated this database then I created it in mysql server 5.5 I used the instruction load data local ...
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2answers
42 views

How to convert timezone in MySQL using the timezone name?

I want to convert date from one timezone to another timezone in MySQL, MySQL query which I am trying is SELECT DATE_FORMAT(CONVERT_TZ('2015-12-18 06:00:00', '+0:00', '-05:00' ),'%b %d %Y %h:%i %p') ...
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41 views

Can error 1231 after importing a MySQL database be a compatibility issue?

ERROR 1231 (42000): Variable 'character_set_client' can't be set to the value of 'NULL' Query OK, 0 rows affected (0.00 sec) ERROR 1231 (42000): Variable 'collation_connection' can't be set ...
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1answer
48 views

Joining two fast subqueries is very slow

DB: MySQL 5.5.20 (WampServer) OS: Win 7 HDD: Western Digital 3TB Caviar Green, 3.5", IntelliPower, 64MB, Sata3 (WD30EZRX) Memory: 8GB my.ini: http://pastie.org/private/s7l9aadyi0qhfl5bcrnnqq I've ...
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69 views

Optimizing a simple query on a large table

DB: MySQL 5.5.20 (WampServer, default configuration) OS: Win 7 HDD: Western Digital 3TB Caviar Green, 3.5", IntelliPower, 64MB, Sata3 (WD30EZRX) Memory: 8GB MySQL my.ini: ...
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2answers
2k views

Slow INSERT/UPDATE on InnoDB

I have a problem with the performance of my MySQL server, let me explain: I instaled a MySQL server, version 5.5.20 Server version: 5.5.20-log Source distribution SELECT queries runs fast on ...