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

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MySQL SELECT n-th row between dates (time interval)

I have a server which records various sensor data each second and inserts it into a MySQL table. To view the sensor data on a dashboard I have a chart which also gets updated with live data each ...
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183 views

can't I use Current_timestamp as default value in mysql 5.5.47-cll

I am not able to set Current_timestamp as default value. My Mysql version is 5.5.47. Query is ALTER TABLE `downloads` ADD `date` DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP ; While it is working ...
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46 views

Incorrect backup size

We are storing our everyday full backup in remote storage. Everything seems to be working fine, but every seven day interval the archived folder size is much more than the everyday archived backup ...
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1answer
34 views

MySQL allows records longer than varchar(N)

We have a database with a field of type VARCHAR(255) but in it I can see some records having a length of larger than 255, such as 264. How can it be possible? Can it be that the database is corrupt? ...
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47 views

Select rows with most recent date for the given date

I have a table to manage the stock which looks like below product batch qty date Grape BAT0 42 10/3/2016 Apple BAT1 12 11/3/2016 Banana BAT2 15 11/3/2016 Orange ...
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94 views

MySQL. Capture Cis program makes incorrect query: SELECT DISTINCT “PartType” FROM “Capacitor” ORDER BY “PartType”

I am having problems to get one database running. I have a MySQL in my server, the server is running "5.5.48-MariaDB - MariaDB Server" with "UTF-8 Unicode (utf8)" I have a MySQL ODBC 64 bits 3.51 ...
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1answer
251 views

SQL query to compute longest travel time for each id number

I am a novice in SQL and I have a problem as follows. There are two tables TRNSCTN_TAB: CREATE TABLE TRNSCTN_TAB( `transactionId` int , `UniqueId` int , `transactionTimeStamp` varchar(...
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25 views

MySQL 5.5 client SSL connection only works when adding cipher list argument, why?

I set up the packaged MySQL server 5.5 and client on two Ubuntu VM. I configured the server to support SSL. I can connect to the server with the MySQL CLI tool between the VMs, but the connection is ...
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12 views

What configs influence whether user credentials/grants are written to the binlog in Mysql

I have a fairly trivial master-master setup. When testing this setup I see that mysql users are binlogged and replicated on slaves. However on each of the masters the binlog-do-db* is for a specific ...
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57 views

EXPLAIN SELECT query is writing to tmp table

I am getting a "copying to tmp table" when running an EXPLAIN SELECT on a query. This is a pseudo-query showing the structure of the query (I can't post the actual query): SELECT colA , colB , ...
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1answer
36 views

Altering a large table to INNODB

I have a table of 4GB(18 Million Rows) in MYISAM Engine on one of my slave server, and I want to convert it to INNODB Engine, the server is replicating from a master. I tried to use the pt-online-...
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26 views

Slave (SQL thread) replicates very slowly

See this video: https://mckay.media/Yxjp2 I have two MySQL replication slaves which are replicating from the same master. Both slaves are running on identical hardware. Each has its data directory ...
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14 views

Default Space in WAMP

What is the Default Space for MySQL in WAMP SERVER? We are using MySQL as the back-end for our application development, and it is running out of space. How can we increase the disk space? Or are ...
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1answer
24 views

commit statement missing for a dml statement in binary log

I have noticed 'commit' statement missing for a DML statement in binary log. Does it mean that this statement is rolled back in server? I am using mysql 5.5.40. sample binlog at 159527792 160229 ...
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3answers
226 views

MySQL database uses too much CPU

I have a MySQL database which uses too much CPU. I am actually performing benchmarking to the web servers which queries the database. Right now the database is being the bottleneck, it uses too much ...
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75 views

SQL Timeout when updating specific rows that goes away when other columns are updated

The data I'm going to provide won't be very complete, so I apologize in advance for that, and will happily supplement with more on request. I mostly just don't know where to begin looking, and don't ...
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1answer
33 views

What are the side effects of changing MySQL `character_set_server`?

I am having some strange issues with character sets on my system. After digging through all kinds of settings, I found a discrepancy in my character set settings. When I run show variables like '...
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1answer
127 views

sql_safe_updates set to ON by default

This is fresh mysql install from Debian apt. mysql> \s -------------- mysql Ver 14.14 Distrib 5.5.47, for debian-linux-gnu (x86_64) using readline 6.3 .. Server version: 5.5.47-0+deb8u1-...
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MariaDB: Can't connect to MySQL server on '127.0.0.1' (107)

What does it mean the error 107? Can't connect to MySQL server on '127.0.0.1' (107) I haven't found this error in any documentation: https://mariadb.com/kb/en/mariadb/mariadb-error-codes/ https://...
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1answer
34 views

Is it safe to “FLUSH STATUS” in mysql?

We have deployed REDIS to hold some frequent query result to reduce number of connections made on Database server. We need to find out Max_used_connection after deploying REDIS. So we plan to reset ...
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125 views

Non-grouping field error with ONLY_FULL_GROUP_BY mode and tables that have the same column name

I'm finding that MySQL seems to have an issue when ONLY_FULL_GROUP_BY mode is enabled and the query includes a HAVING that refers to grouped columns from different tables that have the same name. ...
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60 views

Optimize MySQL JOIN Query

I've been using following Query to fetch data from MySQL. SELECT SQL_CALC_FOUND_ROWS DISTINCT (wi_individual_g.ind_id), wi_individual_g.ind_id, wi_individual_g.ind_name, ...
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2answers
51 views

How to get month name from week number and year [closed]

I have a week number and a year (e.g. 34 and 2015). I want to get the name of the month to which the specified week belongs. How can I do that?
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55 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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400 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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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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37 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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59 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 MySQL-server-5.5.41-1.el6....
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44 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
181 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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355 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, server-...
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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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104 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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52 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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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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1answer
63 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 -rw-...
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1answer
34 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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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 to ...
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1answer
60 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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2answers
100 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: http://pastie.org/private/...
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176 views

Change MySQL stored procedure 'Database Collation' name

I have imported a DB from Local machine to server machine. While importing the Database, the character set values of the DB are set by system default to "Latin". I have changed the character set to "...
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2answers
32 views

MySQL Database Archive

We have 300 databases in our environment mixed of MyISAM and Innodb(innodb_file_per_table has been enabled) tables.Using MySQL 5.5.19 version. I we are planning archive inactive database.Is there any ...
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2answers
219 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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1answer
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How we can recover MySQL database (Innodb,myisam)

I have found some recovery tool innodb-recovery but it works only on linux machine, I would like to know how to recover innodb tables on windows. Transaction ID based recovery Cancel based, Change ...
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1answer
137 views

Query about MySQL Semaphores in Engine Status

During a recent problem / slow down with one of our slave databases I noticed that when I ran SHOW ENGINE INNODB STATUS. I am getting the following: ---------- SEMAPHORES ---------- OS WAIT ARRAY ...
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mysqld upgrade 5.5 -> 5.6 mysql Error: Failed while fetching Server version! Could be due to unauthorized access

After updating mysql with yum to 5.6 I am getting such an error message when trying to run mysql [root@host rpm]# mysql_upgrade Looking for 'mysql' as: mysql Looking for 'mysqlcheck' as: mysqlcheck ...
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141 views

why in explain in mysql row count is very high

i am using mysql, here is query- mysql> select count(*) from payments as Payment WHERE `Payment`.`fordate` BETWEEN '2015-11-28 00:00:00' AND '2015-12-31 23:59:59'; +----------+ | count(*) | +------...
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1answer
37 views

Why is MySQL 5.5 ignoring this index?

I have a pretty simple query that is not using an index I expect it to because of the WHERE. Table: CREATE TABLE `cba_device_log` ( `id` bigint(20) NOT NULL AUTO_INCREMENT, `device_id` varchar(30) ...
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45 views

MySql server failing to start

I was reinstalling backup image on Raspberry Pi and I noticed that MySql server isn't running. I've looked in /var/log/syslog and I bumped into this: Dec 4 20:06:00 node mysqld_safe: Starting mysqld ...
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86 views

MySQL binlog does not show SQL statements

While checking the binlogs, it struck me that I cannot see any SQL statement. Here's an example: $> sudo mysqlbinlog --database=securities --start-datetime='2015-11-26 13:00:00' --...