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

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MySQL – Backup/Restore Selected Tables/Fields Only

I support a Python application (includes some C modules) that utilises a MySQL database. A number of clients are running this in a standalone environment but have agreed that we can use their data ...
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1answer
59 views

Optimizing a union query

SELECT id FROM user WHERE id IN ( 2,3,4,7,9,21,23,45,324,12,43,254 ) UNION SELECT DISTINCT user_id FROM workgroup_users WHERE workgroup_id IN ( 1,345,34,654,213,123,5,2,3,4 ) I know we should not ...
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2answers
3k views

how to autoincrement varchar datatype depending upon the product details name using trigger

I have a product details table, the fields in the table are *Prod_Id, Product_Name, Quantity, Slno*. Now i have created trigger for varchar data type field and implemented auto increment for Prod_Id ...
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1answer
94 views

How do I create a trigger that cascades new rows into another table?

I am having a table name link with two columns link1 and link2 and another table name hide with four columns hide1, link1,link2 and hide2. If i insert data into link table the data should insert into ...
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1answer
334 views

Btree index and Bit Map Index [duplicate]

Please clarify the difference between BitMap Index and Btree index. I am using mysql version 5.5.37-0ubuntu0.12.04.1. I can able to create Btree index but unable to create the same, Please find the ...
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1answer
74 views

Query to retrieve data based on several where conditions ( Not off Topic , Answer provided below is right ) [closed]

Database : Mysql 5.5 i have a table T1 containing 4 columns : No. , Height , start_time , end_time In column height i have 3 distinct values only : Small Medium High Now i ...
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1answer
2k views

What exactly is SOLR? [closed]

It seems like a magical technology that can Do spatial search do full text search The problem is, It doesn't say where does it store all the data. Does it have it's own proprietary database If it ...
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1answer
22 views

mysql performance

Currently,we are using mysql 5.5.4 database on server with 4GB RAM,500GB HDD on Linux.There are predominantly 3 databases and the maximum size of database is 100MB.Assuming data grows at rate of x mb ...
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1answer
155 views

Is there any limit for MySQL database rows

I'm creating a database website which has a lot of data (Username,name,address,posts etc). Is there any limit to store database rows? (I have a table with more than 100,000 rows) How to host this ...
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1answer
1k views

mysql server is not starting [closed]

mysql server is not starting after modifying configurations key_buffer = 16M max_allowed_packet = 16M thread_stack = 192K thread_cache_size = 8 query_cache_size = 16M after ...
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1answer
17 views

What should I do if i forget password in MySQL?

I am using MySQL5.5. I trying to login in mysql from terminal by using "sudo -u root -p" But i could not remember password. How can i fix this problem?
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2answers
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MYSQL: Join with many to many

I'm trying to create a view and trying to see what can be done, I have a main table a table I want to join to and also a junction table. Event table (it's very big so it's just dummy data): ...
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1answer
1k views

Having too many connection problem

We have an magento store and having 9K products and 2 store views the trouble is we are getting too many conection error while the site is in normal loads. 1) We have 100 connectoin open in mysql. 2) ...
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1answer
22k views

How to get MAX and MIN in GROUP BY query?

In a simple query SELECT col1, col2, col3 FROM table1 GROUP BY col1 each row includes the first value of col2 and col3 for each unique value of col. How to select MAX and MIN for each value of ...
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1answer
4k views

Why does MATCH (FullTextSearch) AGAINST ('*' IN BOOLEAN MODE) return nothing?

MATCH (FullTextSearch) AGAINST ('k*' IN BOOLEAN MODE) return something Namely anything with a word that start with k MATCH (FullTextSearch) AGAINST ('ku*' IN BOOLEAN MODE) return less MATCH ...
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0answers
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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
310 views

Compare MongoDB and MySQL

Can anyone help me to make right decision for choosing scalable and reliable database? I have to create 3-4 tables with around 200 columns each and these tables will have around 5000 data records. As ...
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3answers
101 views

Listing databases that are not in use

I want to show databases that are not used. For that I tried this query, but the result set is empty: mysql> SELECT SCHEMA_NAME FROM INFORMATION_SCHEMA.SCHEMATA where SCHEMA_NAME NOT IN ...
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1answer
73 views

Need help on query optimization in MySQL

Below is the query, I need to optimize it. It is using subquery, I need to re-write it using join how to do this SELECT Client_ID FROM SQL_AuditPro.clients c WHERE (SELECT ...
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1answer
55 views

How to create Mysql Replication on mysql 5.5 master-slave [duplicate]

Guyz please tell me how to replicate master-slave in mysql 5.5
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2answers
320 views

Performance with IN clause

Does indexed data affect query performance? means If I passed value as 1,2,3,4... in ordered form in any IN clause, can it improve query performance? and what happen in case I pass value randomly ...