In the context of a database, optimisation refers to the process of the query optimiser selecting the best query plan to execute.

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2answers
499 views

Is there a good reason to store big text data outside database?

I was analyzing my MySQL database performance and found that tables containing text fields are just huge, larger than 1Gb. This data is only used when loading single record (like article or blog ...
7
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2answers
188 views

Is there any way to prevent the memo structure from being pruned?

We know that the memo structure is pruned and some expensive alternative plans are discarded during optimization. I was wondering if there is any way to prevent this and let the optimizer just ...
3
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1answer
144 views

How un-clustered is a CLUSTER USING table in PostgreSQL

I have some tables which benefit greatly from CLUSTER ON/CLUSTER USING in Postgres SQL: # CLUSTER table USING index_name; # ANALYZE VERBOSE table; # CLUSTER VERBOSE; A maintenance task periodically ...
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1answer
672 views

Large INSERTs performance optimization

I have 15 Amazon AWS EC2 t1.micro instances which simultaneously populate Amazon RDS MySQL d2.m2.xlarge database with data using large INSERTs (40000 rows in query). The queries are send ...
0
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1answer
412 views

Are there any disadvantages to partitioning on financial year?

Our current set up has one table per financial year (May 1- April 30). Each table has approx 1.5 million rows. We have about 8 years of data, and will obviously be adding each year. The majority of ...
2
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2answers
203 views

Why does adding LIMIT to my query make it crawl?

Simple query: select sum(score) total,name,gender,dob,country from users join scores on users.id = scores.user_id where date between '2012-01-01' and '2012-01-31 23:59:59' group by scores.user_id ...
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1answer
76 views

Query optimization when no row is returned

I am using explain to figure out what is happening in my query which is: explain select t from c where u1_id = 1 group by t; I see "Using where" in the Extra column of the resultset. But this only ...
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5answers
1k views

Force sql server to run query conditions as written?

Im using Sql server 2008 R2 And I have this pseudo query (SP) : select ... from ... WHERE @LinkMode IS NULL AND (myColumn IN (...very long time exeted query...)) ... ... The ...
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0answers
115 views

InnoDB tuning with 1G of ram limit

I am trying to calculate variable moving averages crossover with variable dates. That is: I want to prompt the user for 3 values and 1 option. The input is through a web front end so I can build/edit ...
4
votes
1answer
572 views

Postgres: count(*) vs count(id)

I saw in the documentation the difference between count(*) and count(pk). I had been using count(pk) (where pk is a SERIAL PRIMARY KEY) not knowing about the existence of count(*). My question is ...
1
vote
1answer
581 views

Will OPTIMIZE TABLE have any impact on my data?

I'm having issues with a database that is getting quite slow. The analyzer in phpMyAdmin recommends that I run OPTIMIZE TABLE on my tables. But before doing so, I would (of course) like to know if ...
6
votes
3answers
790 views

Optimize UNION query in MySQL

I have a problem with a UNION query in MySQL. We have 10 millions players on our website and we would like to select players with a multi-criterias system. For exemple, selecting US people, men, more ...
3
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1answer
491 views

Simple MySQL query randomly takes forever

I'm having an issue on my server with a simple PHP send emails script that runs every minute via a cronjob. The script contains a MySQL query that runs very fast most of the time, but randomly will ...
0
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1answer
43 views

Misunderstanding statement in MySQL documentation

I can't understand this statement in Optimizing Data Size: Declare columns with identical information in different tables with identical data types, to speed up joins based on the corresponding ...
3
votes
1answer
379 views

mysql: need help to optimize my query/table

I'm wondering if someone could help me optimize my tables/query to speed up a query. It is currently running ridiculously slow. I think a well-thought out index could help me. Any help would be really ...
0
votes
1answer
130 views

Need ideas about OPTIMIZE TABLE

Looking at a database with 10 tables and fairly active at by-the-hour changes. On the first of each month, I purge some rows from 3 tables to remove outdated material and keep the size down. All of ...
1
vote
0answers
607 views

How can I join one to one to (many to one) without using group_concat

I have a table structure as follows: -- -- Table structure for table `emails` -- CREATE TABLE IF NOT EXISTS `emails` ( `ID` int(5) NOT NULL AUTO_INCREMENT, `email` varchar(255) COLLATE ...
0
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1answer
610 views

Optimizing ORDER BY for simple MySQL query

I'm trying to optimize this really simple query, and it gives me grief for a day now :( Seems pretty straightforward, I need to select with a JOIN from 2 tables, and get top X results sorted in a ...
0
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1answer
252 views

Database schema design help needed

I am developing a PHP application expecting millions of records both parent and children. My goal is to design an optimized database design to achieve high speed and performance. This application ...
0
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1answer
147 views

Memcache implementation

I have a Wordpress site that uses WP Super Cache plugin in order to make my blog posts and pages stay as HTML so that less PHP/MySQL code is executed. However, there's a featured box that can't get ...
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1answer
82 views

extra steps after changing storage engine and adding index

Someone told me to look into his website for quick optimization; I'm a programmer and i don't have much experience optimizing databases. I have a php/MySQL site uses the MyISAM storage engine. It ...
0
votes
2answers
3k views

MySQL tuning (my.cnf) for very large tables and ad hoc queries [duplicate]

We are an email marketing company and recently switched our setup to MySQL. We need to configure mysql (my.cnf) for extreme performance. We have tried to configure my.cnf but heavy queries can get ...
0
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2answers
135 views

Why does using a variable make a difference in performance?

I have a table that constantly doing insert, and I am trying to run a delete script to remove old record. The delete script looks like this: DECLARE @StarDate DATETIME = '2013-01-13'; DECLARE ...
8
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3answers
6k views

Optimizing queries on a range of timestamps (two columns)

I use postgresql-9.1 with ubuntu 12.04. I need to select records inside a range of time: my table time_limits has two timestamp fields and one property integer. Indeed there are other info columns ...
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2answers
307 views

Exploring and optimizing SQL performance of your system (PostgreSQL and Hibernate)?

Imagine you have inherited some project with extensive usage of SQL queries. Let us assume that Hibernate is used as ORM and PostgreSQL as database, but thats not the point. A question is: could ...
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1answer
66 views

Mysql performance for a nullable unique id column in a large table that references a record in another table

We have a large table of contacts (8 million records) that we promote to with mailings. When these people register we store them in a different members table. But we want to go back and update the ...
1
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1answer
623 views

MySQL subqueries that use range based on values of main queries don't use indices properly

I think I've isolated a problem that has been affecting many of my queries lately. And would like some help to figure out a solution for this. Ok so my findings are that a normal query that runs very ...
0
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1answer
380 views

optimize big sql query

My query has to return a statistics for example for march containing productname and price and its sidedishes (1:n relation) with the right price of each sidedish and the right tax for each sidedish ...
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1answer
88 views

Optimization of a select statement

I'm using MySQL and have a table user_data like this: user_id int(10) unsigned reg_date int(10) unsigned carrier char(1) The reg_data is the unix timestamp of the ...
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1answer
949 views

Correct use of VOLATILE COST (and ROWS) indications in Postgresql stored procedure

While looking at several examples of pl/python and pl/pgsql, I have seen many - but not all - using volatile cost. ie: CREATE OR REPLACE FUNCTION my_function() RETURNS setof record AS $BODY$ -- ...
1
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2answers
84 views

Database and query optimizacion

I have a database containing three tables: tbl_database (main table is the primary), tbl_cmdatabase and tbl_blacklist. The three tables share the same structure but differ in the number of records ...
0
votes
1answer
100 views

What index to add in case of join by two optional fields

I have query similar to the one below, it joins two tables by field which can have NULL value. The result matchs the data if both tables have the same data or consider the condition as optional. ...
3
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1answer
2k views

Slow Queries Not Logging

I am attempting to enable slow query logging on our server in order to identify any queries that could use optimization. Sounds simple enough, however my file is not being written to. I get no errors ...
4
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2answers
1k views

How to Correctly Estimate the Average Number of I/O Operations my RAID 10 disk can offer?

The average Input/Output Operations per Second a disk can sustain is a very important factor in the tuning of MySQL / InnoDB databases, as it drives the speed with which Dirty InnoDB Buffer Pool pages ...
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1answer
135 views

Is there a tuning parameter for MySQL that allows you to set an on-disk gap between non-sequential primary keys?

I understand that one of the primary issues with using a non-sequential primary key is that every disk/memory write that does not come after the last known key causes a re-write of everything from the ...
1
vote
1answer
69 views

Message system - delete message, or flag for deletion?

I'm wondering, what is the best approach about message deletion in a mysql based message system. Plan A: When the sender sends a message, it will be saved in 2 versions. One for the sender and other ...
0
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1answer
63 views

Faster joining on 'most recent' related rows

I have a bug tracking application. The bug table stores very little, because every state change to a bug happens by adding a comment. For example, the current state of a bug is determined by the state ...
1
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1answer
108 views

Does PostgreSQL optimize queries in transaction?

In my app I need to make big imports from user files, and to achieve that all records are updated/created I do it inside transaction. But before it I need to update massive, already existing in DB, ...
0
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3answers
736 views

Mysql optimization help

I've tried optimizing mysql as good as I could, but apparently I'm not to good at it :-) So I come to you guys for help. Server specs are: AMD Opteron CPU 8 cores 16 GB RAM 2x2.000 GB HDD 7.200 RPM ...
2
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0answers
426 views

MySQL: Improve performance for one row insert into table with unique constraint

I have a table with ~ 40 mil records, with a unique index on the url collumn, of type varchar(255). Now the insert speed is about 30/s, is this expected? how could I improve it? I can't use bulk ...
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4answers
156 views

Normalization of DB

I have designed a database using MySQL likewise My question is what else i can do to normalize the DB, for now i am using InnoDB engine for the table to maintain the relation among different tables. ...
4
votes
1answer
1k views

Indexing strategy when using the between operator SQL Server 2008

I have a large table ~25 million rows with the structure CREATE TABLE [dbo].[rx]( [pat_id] [int] NOT NULL, [fill_Date] [date] NOT NULL, [script_End_Date] AS ...
4
votes
1answer
237 views

Does the order of fields in SELECT query matter when using composite indexing?

I understand that the order of columns in the index itself matters immensely; however, what about the order of columns in the subsequent SELECT queries that make use of that index? For example, if I ...
4
votes
3answers
310 views

Good, Bad or Indifferent: WHERE 1=1

Given this question on reddit, I cleaned up the query to point out where the issue was in the query. I use comma first and WHERE 1=1 to make modifying queries easier, so my queries generally end up ...
0
votes
0answers
35 views

optimize this query [duplicate]

Possible Duplicate: Slow query performance My database contains 20,000 rows and the following query is slow. Please help me to speed this up. SELECT r.report_id, ...
2
votes
1answer
822 views

Mysql - show results from 3 tables excluding NULL or EMPTY values for certain fields

I have 3 simple tables with polls, users and votes. I'd like to show all polls ordered by clean count of votes (sometimes either poll_id or user_id don't get inserted). Furthermore I'd like to show ...
3
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1answer
207 views

Query optimization with extreme statistic

I have a table: mysql> describe table_1; +---------------+------------------+------+-----+---------------------+----------------+ | Field | Type | Null | Key | Default ...
4
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1answer
108 views

How to get the information of the optimizer of sql server?

The info like total optimization time, the time spent on each stage of optimization, the number of alternative plans and the cost of each alternative plan. Is there any way to get these info using sql ...
2
votes
0answers
406 views

Best book on query optimization, rewriting, refactoring [closed]

I have a specific problem: huge amounts of Web-related data in Postgres db. The queries running against the data are often very inefficient. But in a more general sense, I need a book that explains ...
0
votes
1answer
4k views

Mysql 5.5: Optimizing all tables with mysqlcheck - is it useful to run the -check option along with -optimize?

I plan on running 'mysqlcheck --optimize --all-databases' to clear up some fragmentation. Would it be useful to run -check with this option or does the -optimize already take care of that? I am only ...