MySQL : Open-Source, Relational Database Management System

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Single Redshift table vs several mysql/ pgsql (on RDS) tables for small (200 tables * 20 columns * 1 million) monthly aggregation data

We're providing SaaS Data Analytics Dashboard for around 200 clients. We're using Amazon Redshift for storing data in in around 5 tables. We're getting around 30 million hits per day. Currently our ...
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6 views

Java error: The url cannot be null ( netbeans and wampserver)

I'm creating a java application (stock management) with Netbeans and Wampserver, I create the stock_db_connection class and the Login class, and I want to test if it's work or not, when I click run ...
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2answers
19 views

Multiple types of parts with multiple types of information (unspecified amount)

I'm having trouble designing a database for a project I was working on recently. It's to do with a garage management system. So I've realised I need to store multiple types of parts (Tyres, engines, ...
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21 views

Correction of a complex query [on hold]

I don't know if this question is appropriate on this forum. I have a huge query : SELECT threshold.id, brand.id, COUNT(brand.id), threshold FROM current_stock, article, product, brand, delivery, ...
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1answer
16 views

Lock wait timeout exceeded; try restarting transaction in NDB

I encountered an error while using an opensource product with a mysql cluster. The error stacktrace is shown below. Caused by: java.sql.SQLException: Lock wait timeout exceeded; try restarting ...
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1answer
18 views

Use of log_bin_trust_function_creators in MySQL

What is the use of log_bin_trust_function_creators? Also, Is the value of the parameter dynamic? Will it change if I restart my MySQL service?
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1answer
9 views

Replicate update statement as Insert in Mysql 5.6

I want to replicate all update statement from Master as a Insert at slave end. 1. Is it possible like in SQL Server ? 2 If so , how ? I want to do it because , if any record on master is ...
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0answers
19 views

Tuning MySQL with InnoDB engine for my application

I've read through a lot of answers, and I realize this is mostly application specific, so I wanted to give some background as to what I'm doing with the database and hopefully get some tips on tuning ...
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1answer
40 views

How to improve perfomance or Query Execution Time in MySQL?

This is my query: SELECT a.z_companyid_pk "z_companyid_pk" , a.company_name "Client" , a.display_name "Display_Name" , ...
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1answer
27 views

Mysql backup bug

I'm trying to run a SQL file created by mysqldump and suprisingly I get a SQL syntax error while running the backup file on the DB. How can it be possible considering that the file was created with ...
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0answers
14 views

Moved a MySQL Database to another server, but socket keeps pointing to localhost

I know I shouldn't bother with this, maybe I should disable the old mysql, but this is a Magento virtual appliance from Bitnami thats work as a whole (application and database on the same server). I ...
4
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1answer
30 views

Fast alternative for “NOT IN”

I have a table A that got a field called id that is the primary key of this table. I also have a table called B which also have a field called id as primary key. Now I want to get all rows from ...
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0answers
31 views

I need to find the “rank” in a sub-set of entries

I am currently working on some sort of a highscore list. But values displayed are individual for each user, ie. limited by constraints. One constraint that I am currently working on is "being part of ...
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0answers
24 views

Can MySQL Enterprise Edition be used for free with no time restriction? [on hold]

My question is about product licensing by Oracle, specifically about MySQL Enterprise Edition licensing. I am not any DBA Master, I'm just a developer in search for answers from the real experts. ...
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2answers
29 views

Finding two users with same pair group

I have the following table which details actions of users and the action's parameters: action_id(auto-increment) | user_id | action_name | action_attr1 I want to find which users performed the same ...
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1answer
28 views

What is the correct implementation of handling concurrent SQL inserts while ensuring a non-primary key column (i.e. wid) unique and auto-incremental?

What is the correct implementation of handling concurrent SQL inserts while ensuring a non-primary key column (i.e. wid) unique and auto-incremental? Note: There was a design constraint that led this ...
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0answers
50 views

How to pass the value of PK to FK

Ok, so here it goes. I have a table called employee. then I have another table called languages. I need to copy the value of PK of employee table to foreign key in Languages table, rather than ...
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23 views

MySQL Workbench cloud alternatives [on hold]

I have some analyst who runs some particular queries which are provided by me. Now when a new analyst joins our team I have to install MySQL Workbench on their laptop to set up the connection. I went ...
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1answer
34 views

Is it necessary to create foreign key in this query? [on hold]

I have the table called investors having as primary key the column id. I have the tables Users, Login_Logs and Accounts. All of these tables contains the foreign key investor_id. Between investor and ...
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0answers
25 views

optimizing a wild card search query in mysql

I want to have a search option in my game portal site. (right now i'm using google's in site search) I want a user to search to enter a search term and need my query to search the search term in the ...
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0answers
27 views

Master/Slave and Master/Master replication - MySQL

What is the difference between having a master-slave replication and having a master-master( where in the second master acting as hot-standby - active-passive) replication? Also, what are the issues ...
3
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1answer
32 views

MySQL query WHERE IN + ORDER BY, which EXPLAIN is better and how to avoid filesort?

This is my table definition, without any special index for now: CREATE TABLE `filter` ( `field_name` varchar(32) COLLATE utf8_unicode_ci NOT NULL, `category_id` varchar(32) COLLATE ...
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1answer
21 views

Data and index file compatibility between patch/revision releases of MySQL

Let's say a server is on MySQL 5.6.1234 (yes I know that number's made up) and gets updated to 5.6.1235 (so an increment in revision / patch number). How safe would it be roll back MySQL to 5.6.1234 ...
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1answer
14 views

Is my import still committing?

I'm importing around 9 million rows into my MySQL DB using the following command: SET autocommit=0; SOURCE my_import.sql; COMMIT; The command line is no longer outputting lines of Query OK, X rows ...
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1answer
24 views

How to do an efficient case insensitive search

As an example, take a city table with 2 columns city_ref (bigint) city_name (varchar) with indexes on both. I want to do a case independent search by city_name. I know I can use like but ...
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1answer
24 views

what is problem with time field in mysql during insert or update time? [on hold]

I have created a time field in MySQL. During INSERT or on UPDATE, if I don't select the time then the time field gets a default value of 12AM. However, I want to set this time field to NULL by ...
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0answers
20 views

Operation failed with exitcode 1 - while importing from a dump folder

I'm new to dbs and I'm trying to learn how a certain db works. They gave me a dump folder to play with it but, after setting up a connection (works), while trying to import, I get this annoying ...
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1answer
19 views

MySQL ERROR 2013 Lost connection

I am running a real old version of mysql(3.23.56). Everything is good, expect when I want to delete all entries of a table. I have checked query, like drop, select,update, their behaviours are ...
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0answers
22 views

Migrating tables from SQL Server to MySQL

I am using MySQL Migration Wizard to copy some tables from SQL server to MySQL local instance. When I define the source and target connection and test them I get a Connection Successful message and ...
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0answers
7 views

Would a nosql db handle sorting by latitude and longitude queries as well as a mysql db?

I have a table with a couple hundred advertisers including the latitude and longitude of the centroid of their zip code. I will also know the centroid of the zip code of website visitors. What I want ...
0
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1answer
28 views

Is it possible to convert mssql to mysql?

I've mssql.sql file I need to convert to mysql schema. Any ideas how? I'm on mac, I guess my choice is very limited. Tried workbench but it asks me for a live server connection to mssql which I don't ...
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0answers
7 views

MySQL Cluster and Async replication

My requirement is to have percona cluster for high availability and have the MySQL's classical aysnc replication for disaster recovery purpose. Is this is feasible? What are the possible issues that I ...
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1answer
26 views

Foreign key default value

I have a master table and another table with foreign key. I can easily add data to master table. But whenever I want to add data to the connected table, I get a message saying Foreign key doesn't have ...
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21 views

MySQL/Eloquent belongsToMany relation - two tables same pivot table allowed? [migrated]

Is it allowed to have two tables, each with a belongsToMany() relation to each other, using the same pivot table? Here is my User table: And here is my Org table: And here is the pivot table: ...
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25 views

Mysql permissions help [on hold]

I need a simple Sql statement that will grant all of the privileges and basicly, establishing a connection to any computer that tries to connect to my remote mysql server with the root account. For ...
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0answers
33 views

MariaDB error on alter table - table removed - constraint name is blocked

Today, we experienced a strange behavior in 5.5.41-MariaDB (InnoDB): An ALTER TABLE (add constraint) statement failed with error (mysql server has gone away after that). Then the database table ...
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2answers
20 views

Delete trigger mysql on another table

I am new on mysql and I am try to create a before delete trigger on mysql. I have a table call "persons" and I need delete a record on another table called "ldap_entries" the table "persons" have a ...
0
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1answer
62 views

how to minimize the data scanned on my database using index?

Is there anyone how to minimize the data scanned on my database?? please show me.. using index? query SELECT IF (e.channel LIKE 'IAX2%', e.calldate, IF(d.channel LIKE ...
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1answer
36 views

Sudden MySQL freeze, with spike in dirty pages, but without obvious write queries

I'm systematically (1/2 times per day) experiencing a freeze in the DB server. Suddenly, all the COMMITs get stuck in 'init' state; they pile up (up to 20/30), an almost no other queries are executed ...
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4answers
88 views

Mysql - Select next x records even if reaching rowset end

I have a table with an ID field, unique, autoincremental. I need to, given certain ID, retrieve next 3 records even when given ID is the last one. Table: ID 1 2 3 ...
0
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1answer
18 views

How to use explode mysql function in where condition with cakephp

I am using cakephp 2.6. I have payment_method fields in mysql table which store the values like 54,52,59,57 . Now my question is that how can i check if new posted payment method id is available in ...
0
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1answer
33 views

Set in mySQL a predefined order for SELECT queries without using the ORDER BY clause

I have a MySQL database and users access it through an old legacy software (OLS) the company bought years ago. OLS connects to MySQL through MySQL ODBC driver. There is no way to change OLS in recent ...
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0answers
23 views

How to find where an unauthenticated user connects from

We are seeing some "unauthenticated users" when I run the command show full processlist in mysql (v5.6). | Id | User | Host | db | Command | Time ...
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3answers
41 views

Use “NOT IN” in the same table, Mysql

I have a table like that: table1 +----+------+--------------+ | id | name | phone_number | +----+------+--------------+ | 1 | A | 111111111111 | +----+------+--------------+ ...
3
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0answers
18 views

Create an SSL connection with ODBC driver to MySQL(5.6) using openSSL

I want to create an asymmetric SSL connection from MySQL to an ODBC driver but don't fully know how to generate the keys and certificates (I'm using openSSL as recommended here: ...
1
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1answer
21 views

Mysql shutting down during a mysqldump of a specific database

I have a server which is running Centos 6.6 with Cpanel. I have been attempting to do mysqldump backups on individual databases. All of the databases are under 5MB except for one. The database that ...
2
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1answer
47 views

Selecting max(date) from union query

I am having a bit of trouble getting accurate results from a query that looks to me as if it should work. RDBMS is MySQL. I am trying to get the max last login date from a union select on three ...
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2answers
102 views

How can i use the same query for all codes?

I use this query in PHPmyAdmin, i have date that contain(date,hour),supp, price and code_product (it repeated many times) : I want to return the last price for the last date of product code ...
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2answers
38 views

mysqldump error on common_schema

I tried to take the backup of common_schema in Server version: 5.5.44 MySQL Community Server (GPL). mysqldump -u root -p common_schema > common_schema_bkup.sql I got the following error: ...
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1answer
16 views

How should I reinit a new db (windows 8 64b)?

In the data directory of Mysql some files are corrupt. Recovering is not working anymore. I have a complete sql backup and want to setup a new db. The complete stuff is installed with the use of ...