MYSQL :: One Big Table Or Many Small Ones?

One Huge Table As Appose To Many Small Ones
i have a very large XML DB (60gb+ and growing on a daily basis) which holds complete life cycles of stock option , i used to hold it all in folders with each folder named like the option paperId so it seemed logical to me to hold it now in diffrent tables for each paper even tough the are all the same exact table , now i'm having some problems with hibernate (one of the biggest reasons i left XML) and so many tables , is it more effiecent to keeeping data like that ?

ofcours i will have to change the PK from datetime to paperId+DateTime if i decide to change to one big table ... how can i calculate diffrence in retrieving data ?

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One Large Table Vs. Many Small Tables
I'm working on a design using PHP & MySQL and I'd like to get some opinions on this.

My design has several tables that will be referenced but I'm wondering if those tables should be broken down even more and referenced more dynamically. The reason that I wonder about this is for long term goals. I hope that eventually there will be two or three thousand records that will be used on a regular basis. These records will need to be separated into groups, but I'm not sure if I should use a field in the database table or create a new table for each group.

If a few hundred records could be in each group, do you think it's better to use one large table with a field for the group ID, or a new table for each group?

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Handler_read_rnd_next = 13k On SMALL Db
I have two very small DBs.

One for a little number game, which only 6 people hit 1-3 times a day. The other is for a prototype of a game I'm working on, and there are no more than 3 users on this.

Using phpmyadmin, I check the page with runtime info and I see

Handler_read_rnd_next 13 k

If I reload this page a couple times, it goes up to 14k.

Most of the queries I use look like

Code:

SELECT c.color, b.percent
FROM tbl_creatures a, tbl_creatures_colors b, tbl_colors c
WHERE a.creature_id =1
AND a.creature_id = b.creature_id
AND b.color_id = c.color_id

And the EXPLAIN SQL for these comes up with

Code:

id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE a const PRIMARY PRIMARY 4 const 1 Using index
1 SIMPLE b ref PRIMARY,color_idPRIMARY 4 const 2
1 SIMPLE c eq_ref PRIMARY PRIMARY 4 hq_proto_creatures.b.color_id 1

To me, this all looks fine. I can't tell if all the Handler_read_rnd_next is due to the phpmyadmin status checks or not.

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Small Databases
I am wondering if having a database for the client back office, a database for the static website and a database for website stats would be a good idea.

The client database would hold credit card info, user info, reg info, project info, client messages and more.
The website database would carry all the content for the pages of the public website like about us, contact, home page, news and such.
The website stats database would keep track of user agents, new hits, returning hits, keyword searches made on the client websites and all that jazz.
Should I make this all ONE giant database or three smaller database?

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Big Select Vs Small Ones
I have an array of 10 IDs.
I need to query the db for values associated with these 10 IDs.

In a lot of places, I have seen people using a php foreach like this

foreach (ids in array)
{
query = SELECT values FROM tables WHERE id = [id 1 in array]
do query
store values
}

we could build one big select statement like this:

query = SELECT values FROM tables WHERE id = [id 1 in array] OR [id 2 in array] OR [id 3 in array].... until we have ids.

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One Big Database Or A Lot Of Small Ones?
My boss is implementing a system where a lot of different sites will be using the same exact database structure. He has it in his head that things would be simpler with one database shared by hundreds, possibly thousands of sites. I feel like each site deserves it's own database, even if it involves more maintainence.

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Small Query Optimization
I need this query optimized using indexes. So I was wondering how I could optimize it to work with an index for speed.The query is:

Quote: select ided from products where dates <= 2006-11-11 or cost=0.00 or url not like 'http://%' or imgurl not like 'http%'

I tried making an index on (dates,cost,url,imgurl) but it doesn't seem to use the index when I do the explain part. I find that even when I miss of the like parts of the query it still is not using the index. It seems to not use the index because of the "or" that is used in the query instead of the "and". Could this be the reason and how could I over come this so that it will use the index.

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Backup A Small Database.
I'm looking to backup a small mysql database. The problem is mysqldump does not exist on the server I'm trying to export the database from.

Does a php script exist which I could use to do essentially the same thing as mysqldump?

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Small Favor Gone Wrong
I have a VPS account and I am trying to move my sister's professional organizations site onto my server more or less as a favor (getting paid a little - but not really worth my time). It is being hosted by a professional hosting company that supplied me with ftp access to download the site for the move.

I am running into a problem because I don't know how to set-up/use mySQL through UNIX. Previously I have used the Plesk interface provided with my VPS account. Plesk (or at least my hosting services configuration of it) won't allow me to create the user I need in order to import the database because the user ID is contained within the user PW. (this is the database coming from the vendor).

The original host has been unhelpful at best so I thought before I go to them and ask for assistance (that I am pretty sure I won't get anyway) that I would post here to find out if there is any easy way through this roadblock or if any the unix commands are simple enough, how I would proceed that way.

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Small Binary Data
Can anybody tell me what way is best to save a small binary data (16 Byte) in MySQL?

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MySQL Upload Small Files
I'm uploading small files (>10K) and mysql is deleting it. The one field is a blob field and everytime i test upload a file thru phpMyAdmin within 2 seconds mysql deletes the row. Theres nothing in mysqld.log, there another log i should be checking out?

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One Big Query Vs Lots Of Small Queries
I am in the process of migrating a MySQL database from one schema to another and am writing a script to extract the info from one table to be inserted into multiple tables on new new db.
My question is this, is it better for me to make one giant query (about 1 million records returned) on the source table, manipulate the data, then enter in the data by cycling through the results, or would it be better to split up the query on the source table into lots of smaller queries with a short pause in between?

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Structure Of Small Social Network
I need to setup a social network type mysql database, but not as intense as friendster, thefacebook, myspace, etc.

i have a structure set up but it think it's weak and extremely limited:

Code:

+---------+-----------+
| user_id | friend_id |
+---------+-----------+
| 5 | 4 |
| 1 | 7 |
+---------+-----------+

i fear it's going to be a lot of redundant IDs in a column, which i think could be a problem when retreiving friends:

Code:

+---------+-----------+
| user_id | friend_id |
+---------+-----------+
| 5 | 4 |
| 1 | 7 |
| 1 | 9 |
| 7 | 9 |
+---------+-----------+

i want to do a "bob is friends with john" and a "jackie knows sally through richard" (aka friend of a friend). that's it and nothing more. how do i structure mySQL database to be able to this?

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A Huge Database Or A Lot Of Small Databases
I have a question regarding database performance.

Which of these two designs would be better:

-Having one huge database with 50 tables or so (each table having millions of rows)

or

-Having a lot of databases with the same amount of tables, but each table would have only thousands of rows

*The mysqlserver is running on a P4 3.0 ghz with 1 gb in ram, but I may upgrade my server soon.

*Privileges to create databases is not a problem since I own the server

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Several Small Calls Vs One Large Call
I am working on a php interface to a mySQL db which will pull lots of rows from the database. Assuming I am selecting a hundred rows by their auto_incremented ID's, is it better to do this with a loop of 100 "SELECT ... WHERE id=" calls, or to do it with one single "SELECT ... WHERE id IN(...)" call, with IN() holding a list of the hundred items.

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Help With A Small Query Optimization Using An Index. THANKS!
I need this query optimized using indexes. So I was wondering how I could optimize it to work with an index for speed.

The query is:

Quote:

select ided from products where dates <= 2006-11-11 or cost=0.00 or url not like 'http://%' or imgurl not like 'http%'

I tried making an index on (dates,cost,url,imgurl) but it doesn't seem to use the index when I do the explain part. I find that even when I miss of the like parts of the query it still is not using the index. It seems to not use the index because of the "or" that is used in the query instead of the "and". Could this be the reason and how could I over come this so that it will use the index.

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Small Database, High Load
I have a very heavy mysql database used website. Data is constantly being updated and at peak there is well over 1,000 people online, after it hits the 1,000 mark, the website starts to lag pretty bad.

My database is only small at around 90mb. We have a web server for the files, and a database server for the database. The load on the web server is fine. But the database server is pretty high.

Would replication reduce lag and load? if i was too add a second database server?

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Inserting Small Image Directly Into Database
How do you insert an image into a table directly using something like data studio?
I have tried googling it and it seems all the examples are using a language to do it for you. The images are between 2-4k and the table is just an int column followed by a blob column. I just thought the statement would go like

INSERT INTO sometable VALUES (1,'image.jpg');

The web suggests uploading and downloading in PHP (which im using) but im building the data first using data studio then just displaying the table information using PHP.

Before i go into displaying the information on the page i just wanted to make sure the insert query is correct.

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Small SQL & Php Webpage Field Database Task
In a webpage, imagine a little section where the user fills in his/her contact details to register. Among this section is a field called "Country". The task is to make this field automatically generate the persons current country of residence. I am told, that the IP ranges and the country to which they belong is in a CSV .xls file. I am also told that the best way to do this is to:

1) Insert the CSV into database table (MySQL).
2) Use php to get that country name onto the website field.

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Large .sql File (break Down To Small Parts)
i have an oscommerce installation that generates a 200mb sql backup file. i want to try and rebuild the installation on my local pc (localhost) to emulate and play with, unfortunately the 200mb file is difficult to handle. phpymadmin seems to crash.

i have console access on the host however.

is there a way i can break down the sql file into smaller increments for easier uploading?

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How To Reset Yahoo Small Business MySQL Database
I am a new user of "Yahoo Small Business" web hosting service and I changed
a lot of settings in my "MySQL Database" using "phpMyAdmin" utility during my
learning period. Now, I want to reset my Yahoo Small Business MySQL Database
to default settings or to reinstall it (I want it to be the same as it was newly
activated).

Note: I tried to repair my database with Yahoo's "Database Setup" page and the
message "Database scheduled for repair" appeared for a few days but nothing
happened. And, I can not login to my database using "phpMyAdmin" utility.

If you can help me to reset my "Yahoo Small Business - MySQL Database" I will
be very pleased.

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MySQL Query Cache: Should I Cache Small, Simple Queries Or Only Complex Ones?
Query cache works great for long, complex queries, but should I also be caching the simplest of select queries.

For example let's say I had a table with 100 records and I needed to select something using a unique key:

SELECT name FROM products WHERE id = 3
Is caching the above pointless, especially in terms of wasted cache memory, considering how basic it is?

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Small Tables Or A Few Big Tables
My Web site is going to use a MySQL database extensively throughout the
Web site. It is a content management system type Web site with lots of
users and written articles and other things. With my database I'm
trying to figure out if I should create big tables that have a lot of
rows in them or if I should create a lot of tables that are very
specific to its data and use a lot of table joins in my select
statements. I'm mostly concerned about performance.

I'm thinking that if I make a lot of tables, then select statements I
do will be really fast because my tables won't contain very many rows.
But I don't know if this is true or not or if it matters for
performance reasons or not.

In my Web site I have a lot of different kinds of data that could put
in many different tables. But, without data redundancy and without
using extra storage space, I can still make a few big tables, and make
that work. I just don't know which way is best for performance --
speed, I want speed. Anybody know what I should do or know a book I
should read or a Web site to go to?

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Table Design Question? House Table, Owner Table, Code Violations Table - Best Way?
Given the tables:

HOUSE
house_ID
address

OWNER
owner_ID
name
telephone...

HOUSE_OWNER_JOIN
?

CODE_VIOLATION_HISTORY
house_ID
violation_ID
violationStatement
...

My goal is to be able to track code violations of the house PER owner.

For example, I need to display a page that shows the current house with it's coe violations and a link to show the HOUSE's history of violation regardless of owner, Like:

House 1009283
Address
Past history (link to the following)

House History
2001-01-04 Owner: John Smith Code Violation: Gutter issue
1999-06-01 Owner: John Smith Code Violation: Faulty Steps
1998-03-02 Owner: Sam Spade Code Violation: Driveway carcks
1990-01-12 Owner: Keith Sledge Code Violation: Grass untidy

For the design of the HOUSE_OWNER_JOIN table, I thought of two ways I could go on this and this is where I need your help.

Option 1:
Have the HOUSE_OWNER_JOIN table keep dates so I can track the ownership changes that way:

HOUSE_OWNER_JOIN
houseID
ownerID
dateOwnershipBegan
dateOwnershipEnded

then I could look up all code violations by date and associate them with their rightful owner.

==================================================
Option 2:
Have the HOUSE_OWNER_JOIN table be the primary keeper of identity data by adding a new primary key and changing the CODE_VIOLATION_HISTORY table to reference that table by chaning the referencing key from house_ID to house_owner_ID:

HOUSE_OWNER_JOIN
house_owner_ID
houseID
ownerID
dateOwnershipBegan
dateOwnershipEnded

CODE_VIOLATION_HISTORY
house_owner_ID
violationStatement
...

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Two Table Query: Grab Rows From One Table Even If No Related Row In Other Table
PHP

$gettray = mysql_query("SELECT trailers.title,
trailers.link,
trailers.movie,
movie.title AS mtitle
FROM trailers,movie
WHERE trailers.movie=movie.word
ORDER BY trailerid
DESC LIMIT 6",$connm);

It works great, but there is one problem. It will not grab any rows from the 'trailers' table if a corresponding movie row does not exist in the 'movies' table.

I want it to pull ALL rows from the 'trailers' table, even if the corresponding row in the 'movies' table does not exist yet.

If the row does not exist in 'movies', the program than uses the entire trailer title like so

PHP

if($ttray['mtitle']) {
$newttitle = explode("-",$ttray['title']);
$newttitle = array_reverse($newttitle);
$ttitle = $newttitle[0];
$ttitle = $ttray['mtitle'] ."- ". $ttitle;
} else {
$ttitle = $ttray['title'];
}

Thanks
Ryan

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INSERT Into New Table, SELECT From Old Table, UPDATE Old Table With New Key
Code:

INSERT INTO retailers
(retailername, retailerdesc, retailerwebsite, retailerurl, active)
SELECT
datasource_retailername,
datasource_retailerdesc,
datasource_retailerwebsite,
datasource_retailertrackurl,
1
FROM
datasources_retailers_idx AS i
LEFT OUTER JOIN
retailers AS r
ON
r.retailername NOT REGEXP REPLACE(i.datasource_retailername, ' ','.+')

UPDATE datasources_retailers_idx SET idretailers=last_insert_id();

Here's what I'm trying to do:

* Select from old table
* check if there is a matching retailer in the new table
* If not, insert retailers details into new table
* Update a reference column in the old table with the INSERTID primary key value of that row from the new table

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Create Virtual Table During Query Or Load Table To Memory From Text File
I have access to my application database via a secure link, so I cannot link a local database to it, only run queries on the remote server and download the result.

The database is missing some useful information, and I cannot add a table at this stage. I would like to achieve the result by creating a virtual table or the like. ...

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Inserting Multiple Items (# Unknown) Into A Table Using Primary Id From Master Table
In my database I have a master table for products using a auto-num id column. One product may have several purchase options (items) which have to be entered into another table.

To enter a new product and items I use a form that gathers the information for the master product and one item. This information is then inserted into the database. For the items I use mysql_insert_id() to get the id into the items table.

My challenge is getting this same id for additional items. Once the user has input the initial product and first item they hit a submit button to call a form for adding any additional items, and this is repeated until all items for that product are entered.

The new items are inserted into the database okay, but always with an id of 0. The mysql_insert_id() no longer works. Is there a way to pass this id from the previous insertion to the new one by passing a variable? or echoing input type"hidden"?

Or even better yet, Im wondering if I can ask the user at the time of entering information for the product how many items that particular product has and then bring up that many form fields to enter multiple items? Can this be done using something like an incremented loop to call form fields?

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Delete Rows From Table A, Which Dont Exist In Table B (base On Column X)
I have 2 tables identically structured.

A & B

Table A, has column: Product (product code) as primary key

Table B doesn't.

Apart from that they have the exact same fields.

There's also a column: supplier

I want to

Delete * from table A, where does not exist in B (based on column: Product) & where supplier = apples

So to elaborate. Table A is my main table, but it now contains outdated products from supplier apple. Table B has the latest list of products from supplier apple. So I want to remove old products from A that supplier apple no longer makes.

mysql version 4.0.27

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Table Join Nested Set Table With Father Id Of Specific Level Depth
I have a problem with a query which includes 2 Tables:

a nested set table 'tree' with the columns .....

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ERROR 1005: Can't Create Table './db/table.frm' (errno: 150)
I found the key to solve this problem in:

http://darkstar.ist.utl.pt/mysql/do...onstraints.html

You'll probably need an INDEX for that new foreign key you are declaring in
older versions this isn't neccesary but in latest ones it is a restriction.

You can have more info about the error description if you have root access
by typing
mysql> show innodb status;

LATEST FOREIGN KEY ERROR
------------------------
030807 1:27:10 Error in foreign key constraint of table database/table:
There is no index in the table database/table where the columns appear
as the first columns. Constraint:
foreign key (key) references database.table(key) on delete cascade)
type=innodb

also if you type:
shell> perror 150

you obtain:
150 = Foreign key constraint is incorrectly formed

I hope this to be enough...

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Trying Abort One Select Accessing One Table Locked By Lock Table.
I'd like to configure one time to abort one transaction that are accessing one table locked by lock table write command ex:

Transaction A
mysql> start transaction;
mysql> lock table mytable write;

After I'll start new transaction B (another connection)

mysql> start transaction;
mysql> select * from mytable;

It's will become long time to wait...

My transaction B never "die".

I tried to configure innodb_lock_wait_timeout=20 in my.ini without success,

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Copying Column Names And Properties From An Existing Table To A New Table?
I've got a table with 42 columns, set to different types (string, datetime, date, integer). It has 8 million rows. I want to make a new table with the exact same columns, but with no data in it. Is there an easy way to do this without re-defining every column?

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How To Delete From 1 Table Some Rows Based On Match Results In 2nd Table?
How to delete from TABLE-1 all rows with indexes "i" that match to index j=2 from TABLE-2?

TABLE 1:
+---+------+
| i | name |
+---+------+
| 1 | item1 |
| 1 | item2 |
| 7 | item3 | <-- delete all rows with i=5,6,7
| 6 | item4 | <-- delete
| 5 | item5 | <-- delete
| 5 | item6 | <-- delete
| 7 | item7 | <-- delete
+---+------+

TABLE 2:
+---+---+------+
| j | i | name |
+---+---+------+
| 1 | 1 | item1 |
| 1 | 3 | item2 |
| 1 | 2 | item3 |
| 2 | 5 | item4 | <---- j=2 => i=5
| 2 | 6 | item5 | <---- j=2 => i=6
| 2 | 7 | item6 | <---- j=2 => i=7
| 3 | 8 | item7 |
+---+---+------+

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ALTER TABLE Produces Error # 1005 Can't Create Table.
I'm a SQL 2000 DBA intern

I'm replicating a current production MySQL DB into a WAMP enviornment on my computer. The production version is on a MySQL 5.0.22-Debian_0ubuntu6.06.3 and my WAMP sandbox is running MySQL 5.0.51b.

So i exported the production database to a sql file and tried using phpMyAdmin to upload it to my WAMP sandbox. MySQL on my computer gave me and error on the piece of code:

ALTER TABLE `Event_Crews` ADD CONSTRAINT `Event_Crews_ibfk_1` FOREIGN KEY ( `Event_ID` ) REFERENCES `Events` ( `Event_ID` ) ON DELETE CASCADE ON UPDATE CASCADE

where Event_ID on both tables is an int.

and I get this error from MySQL:

#1005 - Can't create table '.ambulance#sql-11d8_7d.frm' (errno: 150)

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Selecting Data Form One Table That Is Based On An Entry In Another Table
This is the code I am using:

***********
SELECT co_name,city,country,logo_small FROM $info WHERE $info.co_name=$categories.co_name AND WHERE $categories.everyday_wear='y' ORDER BY co_name ASC
***********

I am using a while loop in php to loop through all of the records but no records are being displayed. What am I missing? Do I need to use a JOIN statement?

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Transform Or Pivot(?) Or Crosstab(?) Table In MySQL. One Data Table.
I have a table in the form:

year | season | hits

2004 | Summer | 42
2004 | Autumn | 43
2005 | Spring | 51
2005 | Summer | 52
2005 | Autumn | 53
2006 | Spring | 61

I want to generate a transform or pivot or crosstab - I'm not sure what the correct term is - to return the data in form

year | Spring | Summer | Autumn
2004 | ------ | ----42 | ----43
2005 | ----51 | ----52 | ----53
2006 | ----61 | ------ | ------

Could anyone suggest a mysql query to generate the required output?

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Updating Rows In Table B Based On Related Field In Table A
Ver 4.1.8-standard for apple-darwin7.6.0 on powerpc (Official MySQL-standard binary)

I am trying to do some data migration based. I have several tables that contain our legacy pkey field and I want to update the tables with new ID's.
I need to do this several times and have tried it several ways to no avail.

Table A
---------
companyID int(10) pKey
legacyID int(10) old legacy pkey

Table B
---------
bAID int(10) pkey
companyID int(10)
legacyID int(10)

Table A has values for both companyID (unique key) and legacyID.
Table B has values for bAID (unique key) and legacyID but companyID is empty.

I need to update tableB.companyID with tableA.companyID based on tableb.cSerialID to tablea.cSerialID relationship.

I need a query that will update ALL rows.

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Multi Table Query, Grab More Than Single Row From Secondary Table
I have a query like so:

PHP Code:

$selectt = mysql_query("SELECT trailers.trailer_id,
trailers.trailer_title,
trailers.description, trailers.file_url,
trailers.runtime, trailers.views,
trailers.rating, trailers.tt, trailers.keyw, trailers.date,
tags.snub,
films.film_title, films.studio, films.keyw, films.image
FROM films,tags,trailers
WHERE trailers.trailer_id=tags.trailer_id
AND trailers.film_id=films.film_id
ORDER BY trailers.trailer_id DESC LIMIT 8",$dbh);

I know this is pretty sloppy, I have multiple 'tags' per trailer ID, and I was hoping to grab all of them in a single query; maybe into an array? So that it shows the row, and then all the tags that belong to it.

Possible?

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ALTER TABLE Deleted The Rows - Error: Table Is Full
Today when I tried to insert data in a table i received the error that 'table is full'. On SHOW TABLE STATUS, I noticed the size of table is grown to 4GB (rows 5359211).

mysql> SHOW TABLE STATUS LIKE 'messages' G
*************************** 1. row ***************************
Name: messages
Engine: MyISAM
Version: 9
Row_format: Dynamic
Rows: 5359211
Avg_row_length: 801
Data_length: 4294967288
Max_data_length: 4294967295
Index_length: 45783040
Data_free: 0
Auto_increment: 5406252
Create_time: 2007-04-20 18:26:38
Update_time: 2007-08-22 09:55:22
Check_time: NULL
Collation: latin1_swedish_ci
Checksum: NULL
Create_options:
Comment:
1 row in set (0.00 sec)
Here is the table structure.

CREATE TABLE `messages` (
`id` int(11) NOT NULL auto_increment,
`subject` varchar(255) NOT NULL default '',
`message` text NOT NULL,
`attachment_path` varchar(255) default NULL,
`new` tinyint(4) NOT NULL default Ɔ',
PRIMARY KEY (`id`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1;

On searching I found the this link.
http://dev.mysql.com/doc/refman/4.1/en/full-table.html

According to manual i executed the following query

MySQL
ALTER TABLE messages MAX_ROWS=20000000000;
I skipped AVG_ROW_LENGTH from the query, I was confused what should be the value for this.

After executing the query, when i check the table status it displayed totally different picture. Now there were only 170109 rows left.

mysql> SHOW TABLE STATUS LIKE 'messages' G
*************************** 1. row ***************************
Name: messages
Engine: MyISAM
Version: 9
Row_format: Dynamic
Rows: 170109
Avg_row_length: 649
Data_length: 110563036
Max_data_length: 281474976710655
Index_length: 1961984
Data_free: 0
Auto_increment: 5409214
Create_time: 2007-08-23 10:07:08
Update_time: 2007-08-23 13:41:57
Check_time: NULL
Collation: latin1_swedish_ci
Checksum: NULL
Create_options: max_rows=4294967295
Comment:
1 row in set (0.00 sec)
What could be the reason of this rows deletion?

I am on 32 bit system.
MySQL version: 4.1.18-standard-log
Operating System : CentOS 3.x
Memory: 4 GB DDR

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3,000,000 Unique INT(11) Low-Hi Ranges In My TABLE, Am I Stuck With FULL TABLE SCAN?
I have a table with 3,000,000 different IP netranges.

each row has a unique range: ie: 1xxxxxxx-1xxxxxxx2
..

I try to find the primary_index when querying WHERE var BETWEEN lowIP and highIPrange.

Since there all of the netranges are unique, it seems like my INDEXES are useless, so the only way to optimize this would be to horizontally partition the data? The query is extremely slow ~1 second in MyISAM, and ~.50 second in MEMORY table format.

I'm assuming the only option is to horizontally position the data to improve performance, am I correct?

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ALTER TABLE `table` ORDER BY `column_a` DESC
I try to get better performance by implementing this:

http://dev.mysql.com/doc/mysql/en/alter-table.html

"ORDER BY allows you to create the new table with the rows in a
specific order. Note that the table does not remain in this order after
inserts and deletes. This option is mainly useful when you know that
you are mostly going to query the rows in a certain order; by using
this option after big changes to the table, you might be able to get
higher performance. In some cases, it might make sorting easier for
MySQL if the table is in order by the column that you want to order it
by later."

I run this SQL query on one of the table:

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Rights To Create Table, Select, Then Drop Table..
I have a need to get data from the db that requires me to=20

1) do a select and create a new table with the results=20
2) run a query against that new table=20
3) drop the new table=20

I have a script on my server that does this using the root account that has all on *.* for the db. It works fine.=20

I now want to get these results on a web page.=20 I want to create a new db user for my .php web page to use to connect to the db that only has the needed priviledges on that specific db to get the job done.=20

what priviledges do I need to give that user?=20

currently I have the following but the user can't even log into the db from the command line..=20

mysql> show grants for user;=20
+-----------------------------------------------------------------------
---------+=20
| Grants for user@% |=20
+-----------------------------------------------------------------------
---------+=20
| GRANT USAGE ON *.* TO 'user'@'%' IDENTIFIED BY PASSWORD
'6fe4c0ab2cf30ae3' |=20
| GRANT SELECT, INSERT, UPDATE, CREATE, DROP ON `db1`.* TO 'user'@'%' |=20
+-----------------------------------------------------------------------
---------+=20
2 rows in set (0.00 sec)=20

when I do a "show grants for user", what should I see to allow what I want?

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Updating Table Based Upon Matching Field In Second Table
I have a database of books that was originally created as a flat file.
Each record has a number of fields, including the authors name. I'm
trying to convert the database to something a little more efficient.
I've created a new table (called Authors) of unique authors names and
assigned each one a unique ID. I've added a new field in the original
table (called Books) for the author's ID. Now, I need to update the
original table with the author ID from the Author's table.

Something like this:

UPDATE Books SET AuthorID = Authors.AuthorID WHERE AuthorName =
Authors.AuthorName

This obviously doesn't work. Any assistance on how to forumulate this
query (or, if I'm headed down the wrong path, the correct way to do this
operation) greatly appreciated.

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How To Delete Rows In A Table Where Url Shows Only 1 Time In Whole Table
I don't know a whole lot about mysql, i need to fix some things in my db and what i described in the title is the first thing id like to do.

Now, I have a table which lists referring urls, clicks to them and the time. Everytime i get a hit from lets say url1.com it gets a new row with a time id (like 1218613809). I am not resetting this table since it has to track the incoming hits forever since the moment they start sending traffic.
But now the table starts getting the hickups now and then, it has about 850.000 records in it and it cant handle it anymore. I need to do a 'repair table' action and then it's good again, but it happens more and more often lately.

So first i want to delete the rows of the urls who have only sent me 1 click. These urls who sent me 1 click only have one row. When an url sent me 20 clicks, that url is in 20 rows in the table.

So I want to delete the rows of the table with the url's that only show once in the entire table. How do i do this?

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Can't Create Table -- Error 1050 - Table Already Exists
I tried to create a table in the database. Here is the query sentence :

CREATE TABLE word (aff_code varchar( 10 ) NOT NULL default '',position tinyint( 1 ) NOT NULL default '0',flag tinyint( 1 ) NOT NULL default '0',PRIMARY KEY ( aff_code, position )) ENGINE = MYISAM DEFAULT CHARSET = latin1;

I was expecting to create a three column table. However, MySQL kept reporting error : ERROR 1050 (42S01): Table 'word' already exists. The fact is there is no table in this database. I then changed the table name, engine type, MySQL still report the same problem. I've tried changing database name. Still the same problem.

Prior to the query, I run a program that created (and inserted data as well) 65,000 tables in another database (same server although). I'm wonderring would this cause some kind of dead lock that result in the problem of not able to create any more table?

Can anybody give me some tips on how to solve the prolem?

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REPAIR TABLE :: Used For Rebuilding Indexes On An InnoDB Table?
Can REPAIR TABLE be used for rebuilding indexes on an InnoDB table? The only documentation I have seen is for MyIsam. There are 30 million records which has taken me 9 days to populate. I've made a backup but want to make sure this will work before I try it.

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Check Table And Repair Versus Optimize Table
I am confused about the difference between running a CHECK table and REPAIR(if necessary) versus running an OPTIMIZE table. It's not very clear in the documentation, but seems that OPTIMIZE table does a check and repair in addition to the other functions performed by optimize.

I have inherited some legacy code that does a check and repair and optionally follows it with an optimize. That seems redundant to me and I would like to streamline the code to make it an "either-or" selection.

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