MySQL : Open-Source, Relational Database Management System

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Inconsistencies with ADD CONSTRAINT index_name in MySQL

I created this example table CREATE DATABASE foobar; USE foobar; CREATE TABLE foos ( id INT(11) AUTO_INCREMENT PRIMARY KEY, firstname VARCHAR(30) NOT NULL, lastname VARCHAR(30) NOT NULL, ...
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2answers
111 views

MySQL Workbench not showing stored procedures that I have created

I have a simple stored procedure that I have just created. I have applied this script to my database This script shows up in the my list of stored procedure However, when I restart MySQL ...
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0answers
11 views

Deadlock occur during multiple insert on Single database? [on hold]

I have multiple windows services thread that insert values into database. But when parallel insertion happens it gives error After show innodb engine status gives Deadlock issue.
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0answers
12 views

Track entity updates (by who and when)

I need some advice on how to store information about who created/updated an "entity". I keep going back and forth between Option1, 2 and 3 (see below): Background This is a legacy system and there ...
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1answer
42 views

Why is it that when I drop a field in table it says `#1050 - Table already exist`

I want to drop some fields of a table but it returns an error. the query is.. ALTER TABLE `tbl_incoming_bub` DROP `approved_date`, DROP `approved_by`, DROP `incoming_date`, DROP `incoming_by`, DROP ...
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3 views

How to define partition according to Date?

I am currently MySql 5.6 is used. In database contain log table that is paramlog_ems.In that log table contain 2M of row. I want make partition according to Date. Following is the table structure. ...
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4answers
8k views

MySQL 5.6 Failure

I have the following in RPM_UPGRADE_HISTORY in /var/lib/mysql MySQL RPM upgrade to version 5.6.10-1.linux_glibc2.5 'pre' step running at Fri Mar 15 15:41:26 EDT 2013 ERR file(s): -rw-r----- 1 mysql ...
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1answer
1k views

mysqlcheck --repair a specific table?

I logged in my server via SSH and committed a "repair table xxx" query on a MyISAM table with 34 million rows and 69GB of data. Unfortunately the SSH connection was lost. When I logged back in I found ...
2
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1answer
256 views

Table design problem

I'm looking for a SQL design solution for the following problem. The idea is that I have a validation form that contains the client's data. Each client can log in to his account and edit his data. ...
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2answers
660 views

Trying to recover/import/transfer database from MySQL data dir

I used phpMyAdmin->export to create a backup of my database but I have now discovered it did not export the whole database, some tables was missed/refused. However at the time of doing the export I ...
0
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1answer
23 views

Database Design For Social Network apps

I'm going to build a social network app. Each user will have photos, videos, details, posts etc. My question is when a new user registers, should I generate many new tables for that user or have one ...
0
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1answer
19 views

In MySQL why is the first batch executed through client-side prepared statement slower?

I have around a million lines to be inserted into a MySQL (InnoDB) database, so to speed things up I turned to batch/multi-line insert. To be specific, I connect to the database (I'm using Java, so ...
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19 views

Adding a constraint to both tables independantly in join [migrated]

I am trying to create a SELECT statement from two different tables, where I use to send messages, I don't want to send a message to someone for 1 wk after they join, however if I have already sent ...
0
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1answer
627 views

MySQL failover - Master to Master Replication

My company is trying to implement a MySQL failover mechanism, to achieve higher availability in our webservices tier - we commercialize a SaaS solution. To that end we have some low-end VMs scattered ...
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2answers
241 views

How to select the latest record of each hour in a day

I want to select the latest record of each hour in a given date, based on the datetime column 'reading_on' in my table , what is the best way to do it. I already tried group by HOUR(reading_on) with ...
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2answers
2k views

MySql InnoDB tables are missing after restarting

I had a MySql database with a few InnoDB tables. After restarting the server, and starting MySql Server again, I connected to the MySql Server using MySql Workbench, and couldn't see the database at ...
2
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1answer
213 views

Avoiding Multiple Queries when Searching for Records Associated with a Set of Records

So, I am sure I have done something really stupid while designing this, and I'm open to schema changes if they'll really help me out. On to the problem: I have a custom shopping cart system (backed ...
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2answers
56 views
+50

Convert date in date list condition to list of date ranges

I want to look for all the records that occur on specific dates. SELECT * FROM table1 WHERE date(column) in ($date1, $date2, ...); However, as many of you, know this kind of comparison doesn't get ...
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2answers
141 views

DELIMITER issue in MySQL 5.6

Drop procedure if EXISTS rotatepjp; DELIMITER // CREATE PROCEDURE rotatepjp() BEGIN DECLARE u_id, settingval, pjp_userid, pjp_beatid, u_frequency INT; DECLARE u_pjpstartdate, pjp_fordate, ...
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1answer
117 views

Mysql join table order by index

First Master Table CREATE TABLE `edipostingmaster` ( `ID` bigint(20) NOT NULL AUTO_INCREMENT, `applied` int(11) DEFAULT '0', `fileName` varchar(255) DEFAULT NULL, `checkNo` varchar(100) ...
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0answers
11 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 ...
3
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2answers
164 views

MySQL 1264 warning from libmysql

I'm using the libmysql.dll library to connect to my database from a 3rd party application (metatrader). I managed to connect and things are going almost fine. I use mysql_real_connect and ...
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0answers
12 views

How to store user defined scoring formulas?

First post, so apologize if I have not chosen the best spot for it: If I had table of values, let's say corresponding to a question number and its corresponding answer, what is the correct way to ...
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1answer
32 views

Why Update trigger makes Insertion slow in mysql?

I had create one table, that Table contain Log of meters. Name of that table is "paramgraph_ems" This table contain 1M rows, and insertion per minute is 350 rows. 10 Min takes for inserting 3500 rows. ...
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2answers
21 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 ...
5
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1answer
989 views

Designing a database for a site that stores content from multiple services?

I'm building a site that implements David Allen's Getting Things Done that pulls in your email, Facebook newsfeed, tweets from those you follow on Twitter, and more services are planned. The problem ...
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1answer
141 views

List all mysql reocrds in a master table and last record in a related child table

I want to list all records in a mysql master table and last record in the child table that is related to the master. Here is my code $strsql="SELECT contact.id, contact.title, contact.init, ...
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0answers
23 views

How to send MySQL query results to outfile and standard output at the same time?

I "normally" query MySQL with SELECT col1, col2 FROM tablename LIMIT 10; and sometimes instead send the output to a file with SELECT col1, col2 FROM tablename LIMIT 10 INTO OUTFILE ...
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1answer
60 views

Why SELECT is so slow

I have the following table CREATE TABLE words ( id bigint(20) NOT NULL, `text` int(11) NOT NULL, w1 int(11) NOT NULL, w2 int(11) NOT NULL, w3 int(11) NOT NULL, w4 int(11) NOT NULL, ...
0
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1answer
351 views

Report Builder cannot publish to report server

This is currently in a cloud lab environment. We're not allowed to join any AD domains. We have a linux server (RHEL 6) running MySQL 5.3 and a Windows SQL Server 2012 on Win 2k8 R2. Our laptop is ...
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2answers
107 views

How to join tables when one of them doesn't have any relationship with the others [on hold]

First of all, I know what I am about to show you is a completely DB mess but I just got it like this. Tables : Authors manufacturers_id manufacturers_name 1 Name1 2 ...
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1answer
17 views

Backup/Restore Users/Passwords/Privileges

I am moving from one server to another and I want to backup all databases + users/privileges/passwords from my MySQL Server. I found to backup a database using mysqldump, but I cannot figure out, how ...
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1answer
56 views

Group by maximum consecutive row

I have data like the following: id | src_ip | dst_ip | port | ----|----------------|--------------|------| 256 | 192.168.61.200 | 10.75.64.222 | 80 | 257 | 192.168.61.200 | ...
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1answer
169 views

Query multiple rooms with different conditionals (Adults, Children)

I have a simple query where I select available x Rooms with x Adults + x Children per hotel that matches a date range, but I'm having a hard time trying to figure out how to query a list of rooms per ...
1
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1answer
315 views

How to improve the performance of SELECT queries with multiple JOINs on a 50GB database hosted on AWS m3.medium MySQL RDS?

Example query: SELECT p.ListAgentEmail, p.ListAgentFirstName, p.ListAgentLastName, p.ListingKey FROM Property_RES AS p INNER JOIN Property_RES_COUNTIES_OR_REGIONS ON ...
2
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2answers
22 views

Mysql slow slave

Background: We have our main databases at a data centre which are all working fine. I wanted to add a slave server at our office for backup purposes. I have copied all of the data from an existing ...
0
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1answer
135 views

MySQL taking significantly longer to query via PHP than CLI

TL;DR: I have a query that takes under a second to run via MySQL's CLI, but over 12 minutes via PHP and I'm at a total loss on what to check next. It's a fairly horrid query, full of joins, but the ...
2
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1answer
17 views

How do I change the config path for mysqld?

I want to change configuration file path from C:\ to E:\, but I can't find the way to do this. Alternatively, is there a way to start a new instance with the config file I want? I've done something ...
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19 views

Cannot change datadir for mysqld

I'm currently using Windows 8.1 MySQL 5.6 community server I once had my own mysql server, and all the data is currently stored in E:\db\data, which was the data directory for previous db server. ...
0
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2answers
118 views

If an account has REQUIRE SUBJECT, does it still need a password?

I'm in the process of setting up SSL-secured replication between two servers. Each server has its own public/private keypair, and the CA cert is just the concatenation of the two public certs, like ...
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0answers
8 views

Single INSERT query for multiple records using Prepared statement [migrated]

Here's a fairly basic PHP PDO snippet that accesses a MySQL table named "Users" and inserts rows of data to it using a prepared statement and multiple bindings: $conn = new ...
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1answer
20 views

MySQL/InnoDB - Clustering Index with UUID

In MS SQL Server it is possible to cluster an index on a non-primary, non-unique key. For example, if I wanted to create a clustered index on the insert date to prevent page splits and fragmentation ...
0
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1answer
25 views

Logic Value of Assignment Expression

I'm doing the leetcode SQL problems and kind of confused with the code below: select distinct Num from ( select Num, case when @prevNum = Num then @count := @count + 1 ...
0
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1answer
176 views

How to get names form 3 different tables

I have 4 tables to proceed. In table A I have the parameters of columns in tables B,C,D and the names are there. TB_A ...
0
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0answers
20 views

How to accept apostrophe in a form field for MySQL [migrated]

I have a form that accepts a few names and phone numbers and posts them to a PHP script which then inserts those values into a MySQL table. The code (PHP) is pretty straightforward as you can see ...
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2answers
25 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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0answers
6 views

MySQL Queries in UDF

I would like to create a MySQL UDF (i.e. User Defined Function) that embeds a query; for instance, suppose the UDF is named foobar: mysql> SELECT foobar(); When foobar function receives the ...
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1answer
257 views

Consolidated realtime mysql backup with master/slave setup or binlog

I have 20+ mysql servers and their have low write requirements. So, I want to see if any way I can replicate the data/binlog from these servers to a single slave so realtime backup purpose. If I ...
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0answers
33 views

pt-archiver and foreign keys?

How does pt-archiver handle foreign keys? Does it archive associated data? (seems not but the documentation is not very clear to me) And if not, how could one perform an archive of a table with all ...
0
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1answer
994 views

Problems in opening mysql query browser

My mysql query browser doesn't run. I just started to work with xampp and php. So I just installed xampp in my local machine. Now I have a problem in opening mysql query browser... What I'm getting ...