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• Oracle Enterprise Linux or Red Hat Enterprise Linux?

  - by peturgretars

  I would highly appreciate hearing some opinions regarding the choice of Linux distribution when it comes to setting up an Oracle 11.2.0.3 RAC. We are about to install 2 node Oracle 11.2.0.3 RAC's in data centers A and B. Then we are going to have a standby in B for A and a standby in A for B using Data Guard in ASYNC transmit (long distance). Personally I have more experience with OEL and I know that for example Oracle Smart Flash Cache and zero patching downtime were only supported in OEL 5. I am not sure about OEL 6 vs RHEL 6 though. My question is, which Operating System should we go for and why, Oracle Enterprise Linux 5/6 or Red Hat Enterprise Linux 5/6? The hosting company is unfortunately not supporting OEL at the moment so if OEL is the choice then how would convince the hosting company to start using OEL and supporting it? Thanks so much!

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• mysql Delete and Database Relationships

  - by Colin

  If I'm trying to delete multiple rows from a table and one of those rows can't be deleted because of a database relationship, what will happen? Will the rows that aren't constrained by a relationship still be deleted? Or will the entire delete fail? Thanks, Colin

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• Mysql : Request to select the last 10 send/received messages to/by different users

  - by Yako malin

  Hello, I want to select the 10 last messages you received OR you sent TO different users. For example the results must be shown like that : 1. John1 - last message received 04/17/10 3:12 2. Thomy - last message sent 04/16/10 1:26 3. Pamela - last message received 04/12/10 3:51 4. Freddy - last message received 03/28/10 9:00 5. Jack - last message sent 03/20/10 4:53 6. Tom - last message received 02/01/10 7:41 ..... Table looks like : CREATE TABLE `messages` ( `id` int(11) NOT NULL AUTO_INCREMENT, `time` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP, `sender` int(11) DEFAULT NULL, `receiver` int(11) DEFAULT NULL, `content` text ) Have someone any solution ? Thanks in advance for your help.

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• MySQl - two counts with different WHERE in one query

  - by Qiao

  table field1 field2 a 1 b c 3 e 4 f I need to count field1 and not empty field2 with on query: SELECT COUNT(field1) FROM table + SELECT COUNT(field2) FROM table WHERE field2 != '' result should be 5 and 3 in one query. Is it possible?

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• Mysql - Help me change this single complex query to use temporary tables

  - by sandeepan-nath

  About the system: - There are tutors who create classes and packs - A tags based search approach is being followed.Tag relations are created when new tutors register and when tutors create packs (this makes tutors and packs searcheable). For details please check the section How tags work in this system? below. Following is the concerned query Can anybody help me suggest an approach using temporary tables. We have indexed all the relevant fields and it looks like this is the least time possible with this approach:- SELECT SUM(DISTINCT( t.tag LIKE "%Dictatorship%" OR tt.tag LIKE "%Dictatorship%" OR ttt.tag LIKE "%Dictatorship%" )) AS key_1_total_matches , SUM(DISTINCT( t.tag LIKE "%democracy%" OR tt.tag LIKE "%democracy%" OR ttt.tag LIKE "%democracy%" )) AS key_2_total_matches , COUNT(DISTINCT( od.id_od )) AS tutor_popularity, CASE WHEN ( IF(( wc.id_wc > 0 ), ( wc.wc_api_status = 1 AND wc.wc_type = 0 AND wc.class_date > '2010-06-01 22:00:56' AND wccp.status = 1 AND ( wccp.country_code = 'IE' OR wccp.country_code IN ( 'INT' ) ) ), 0) ) THEN 1 ELSE 0 END AS 'classes_published' , CASE WHEN ( IF(( lp.id_lp > 0 ), ( lp.id_status = 1 AND lp.published = 1 AND lpcp.status = 1 AND ( lpcp.country_code = 'IE' OR lpcp.country_code IN ( 'INT' ) ) ), 0) ) THEN 1 ELSE 0 END AS 'packs_published', td . *, u . * FROM tutor_details AS td JOIN users AS u ON u.id_user = td.id_user LEFT JOIN learning_packs_tag_relations AS lptagrels ON td.id_tutor = lptagrels.id_tutor LEFT JOIN learning_packs AS lp ON lptagrels.id_lp = lp.id_lp LEFT JOIN learning_packs_categories AS lpc ON lpc.id_lp_cat = lp.id_lp_cat LEFT JOIN learning_packs_categories AS lpcp ON lpcp.id_lp_cat = lpc.id_parent LEFT JOIN learning_pack_content AS lpct ON ( lp.id_lp = lpct.id_lp ) LEFT JOIN webclasses_tag_relations AS wtagrels ON td.id_tutor = wtagrels.id_tutor LEFT JOIN webclasses AS wc ON wtagrels.id_wc = wc.id_wc LEFT JOIN learning_packs_categories AS wcc ON wcc.id_lp_cat = wc.id_wp_cat LEFT JOIN learning_packs_categories AS wccp ON wccp.id_lp_cat = wcc.id_parent LEFT JOIN order_details AS od ON td.id_tutor = od.id_author LEFT JOIN orders AS o ON od.id_order = o.id_order LEFT JOIN tutors_tag_relations AS ttagrels ON td.id_tutor = ttagrels.id_tutor LEFT JOIN tags AS t ON t.id_tag = ttagrels.id_tag LEFT JOIN tags AS tt ON tt.id_tag = lptagrels.id_tag LEFT JOIN tags AS ttt ON ttt.id_tag = wtagrels.id_tag WHERE ( u.country = 'IE' OR u.country IN ( 'INT' ) ) AND CASE WHEN ( ( tt.id_tag = lptagrels.id_tag ) AND ( lp.id_lp > 0 ) ) THEN lp.id_status = 1 AND lp.published = 1 AND lpcp.status = 1 AND ( lpcp.country_code = 'IE' OR lpcp.country_code IN ( 'INT' ) ) ELSE 1 END AND CASE WHEN ( ( ttt.id_tag = wtagrels.id_tag ) AND ( wc.id_wc > 0 ) ) THEN wc.wc_api_status = 1 AND wc.wc_type = 0 AND wc.class_date > '2010-06-01 22:00:56' AND wccp.status = 1 AND ( wccp.country_code = 'IE' OR wccp.country_code IN ( 'INT' ) ) ELSE 1 END AND CASE WHEN ( od.id_od > 0 ) THEN od.id_author = td.id_tutor AND o.order_status = 'paid' AND CASE WHEN ( od.id_wc > 0 ) THEN od.can_attend_class = 1 ELSE 1 END ELSE 1 END AND ( t.tag LIKE "%Dictatorship%" OR t.tag LIKE "%democracy%" OR tt.tag LIKE "%Dictatorship%" OR tt.tag LIKE "%democracy%" OR ttt.tag LIKE "%Dictatorship%" OR ttt.tag LIKE "%democracy%" ) GROUP BY td.id_tutor HAVING key_1_total_matches = 1 AND key_2_total_matches = 1 ORDER BY tutor_popularity DESC, u.surname ASC, u.name ASC LIMIT 0, 20 The problem The results returned by the above query are correct (AND logic working as per expectation), but the time taken by the query rises alarmingly for heavier data and for the current data I have it is like 10 seconds as against normal query timings of the order of 0.005 - 0.0002 seconds, which makes it totally unusable. Somebody suggested in my previous question to do the following:- create a temporary table and insert here all relevant data that might end up in the final result set run several updates on this table, joining the required tables one at a time instead of all of them at the same time finally perform a query on this temporary table to extract the end result All this was done in a stored procedure, the end result has passed unit tests, and is blazing fast. I have never worked with temporary tables till now. Only if I could get some hints, kind of schematic representations so that I can start with... Is there something faulty with the query? What can be the reason behind 10+ seconds of execution time? How tags work in this system? When a tutor registers, tags are entered and tag relations are created with respect to tutor's details like name, surname etc. When a Tutors create packs, again tags are entered and tag relations are created with respect to pack's details like pack name, description etc. tag relations for tutors stored in tutors_tag_relations and those for packs stored in learning_packs_tag_relations. All individual tags are stored in tags table. The explain query output:- Please see this screenshot - http://www.test.examvillage.com/Explain_query_improved.jpg

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• MySQL auto increment

  - by mouthpiec

  Hi, I have table with an auto-increment field, but I need to transfer the table to another table on another database. Will the value of field 1 be 1, that of field 2 be 2, etc? Also in case the database get corrupted and I need to restore the data, will the auto-increment effect in some way? will the value change? (eg if the first row, id (auto-inc) = 1, name = john, country = UK .... will the id field remain 1?) I am asking because if other table refer to this value, all data will get out of sync if this field change.

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• text indexes vs integer indexes in mysql

  - by imanc

  Hey, I have always tried to have an integer primary key on a table no matter what. But now I am questioning if this is always necessary. Let's say I have a product table and each product has a globally unique SKU number - that would be a string of say 8-16 characters. Why not make this the PK? Typically I would make this field a unique index but then have an auto incrementing int field as the PK, as I assumed it would be faster, easier to maintain, and would allow me to do things like get the last 5 records added with ease. But in terms of optimisation, assuming I'd only ever be matching the full text field and next doing text matching queries (e.g. like %%) can you guys think of any reasons not to use a text based primary key, most likely of type varchar()? Cheers, imanc

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• Unable to compare valuesfrom mysql in a prepared statement

  - by Cortopasta

  I can't seem to get this to connect to the database so that I can run my prepared statement. Does anybody have an idea what I've forgotten? private function check_credentials($plain_username, $password) { global $dbcon; $ac = new ac(); $ac->dbconnect(); $userid = $dbcon->prepare('SELECT id FROM users WHERE username = :username AND password = :password LIMIT 1'); $userid->bindParam(':username', $plain_username); $userid->bindParam(':password', $password); $userid->execute(); $id = $userid->fetch(); Return $id; } EDIT: I changed the SQL query from a SELECT FROM query, to an INSERT INTO query and it worked. WHat the heck is going on?

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• mysql unique-constraint

  - by Cypher

  I have two tables -- Variables (id, name) and Variable_Entries (id, var_id, value). I want each variable to have a unique set of entries. If I make the value entry unique then a different variable won't be able to have that same value which is not right. Is there some way to make the value column unique for identical var_id's?

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• Multiple foreign keys in one table to 1 other table in mysql

  - by djerry

  Hey guys, I got 2 tables in my database: user and call. User exists of 3 fields: id, name, number and call : id, 'source', 'destination', 'referred', date. I need to monitor calls in my app. The 3 ' ' fields above are actually userid numbers. now i'm wondering, can i make those 3 field foreign key elements of the id-field in table user? Thanks in advance...

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• mysql good way of programing

  - by Syom

  i have the video gallery in my database, which has over 200 000 videos. in my home page in the site i show exactly some videos, which must satisfy to some criteria. and so, what is the question. is it a good way to sort videos every time the home page opene, or i must save the sort results somewhere in the database, and refresh them only if something change. i think it can save me a lot of time. what you think about it. thanks in advance.

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• PHP mysql select results

  - by Jordan Pagaduan

  <?php $sql = " SELECT e.*, l.counts AS l_counts, l.date AS l_date, lo.counts AS lo_counts, lo.date AS lo_date FROM employee e LEFT JOIN logs l ON l.employee_id = e.employee_id LEFT JOIN logout lo ON lo.employee_id = e.employee_id WHERE e.employee_id =" .(int)$_GET['salary']; $query = mysql_query($sql); $rows = mysql_fetch_array($query); while($countlog = $rows['l_counts']) { echo $countlog; } echo $rows['first_name']; echo $rows['last_name_name']; ?> I got what I want to my first_name and last_name(get only 1 results). The l_counts I wanted to loop that thing but the result is not stop counting until my pc needs to restart. LoL. How can I get the exact result of that? I only need to get the exact results of l_counts. Thank you Jordan Pagaduan

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• Converting Oracle date arithmetic to work in HSQLDB

  - by JBristow

  I'm trying to spot-test an Oracle backed database with hsqldb and dbunit, but I've run into a snag. The problem is with the following EJB-QL (simplified a bit): SELECT o FROM Offer o WHERE :nowTime BETWEEN o.startDate AND o.startDate + 7 This seems to only work in Oracle's version of SQL. What's the easiest way for me to convert this to work in both hsqldb and oracle? Assume that changing the two between arguments to named parameters is a very difficult refactor, so I'm going to favor answers that provides a more standardized analog to o.startdate + 7 EDIT: After doing some more research, it looks like Oracle converts the above snippet to o.startdate + INTERVAL '7' DAY which is apparently more standard, but doesn't work in HSQLDB.

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• Cannot log into Oracle Enterprise Manager 11g: ORA-28001

  - by Álvaro G. Vicario

  I can no longer log into Oracle Enterprise Manager 11g. I get this error message: ORA-28001: the password has expired (DBD ERROR: OCISessionBegin) I could log into the server using SQL*Plus. I warned me that the password was going to expire in 7 days (which is not the same as being already expired). Following advice from several documents, I ran these commands from SQL*Plus: ALTER USER sys IDENTIFIED BY new_password; ALTER USER system IDENTIFIED BY new_password; SQL*Plus no longer warns about passwords, but I still cannot use the Enterprise Manager. Then I followed this to remove password expiration: ALTER PROFILE default LIMIT password_life_time UNLIMITED And I've also restarted the Oracle services. In case it was using cached credentials, I've tried to connect from several browsers in several computers. No way: I still get ORA-28001 in Enterprise Manager. What am I missing? Update: Some more info SQL> select username,ACCOUNT_STATUS,EXPIRY_DATE from dba_users; USERNAME ACCOUNT_STATUS EXPIRY_D ------------------------------ -------------------------------- -------- MGMT_VIEW OPEN SYS OPEN SYSTEM OPEN

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• MySQL stuck on "using filesort" when doing an "order by"

  - by noko

  I can't seem to get my query to stop using filesort. This is my query: SELECT s.`pilot`, p.`name`, s.`sector`, s.`hull` FROM `pilots` p LEFT JOIN `ships` s ON ( (s.`game` = p.`game`) AND (s.`pilot` = p.`id`) ) WHERE p.`game` = 1 AND p.`id` <> 2 AND s.`sector` = 43 AND s.`hull` > 0 ORDER BY p.`last_move` DESC Table structures: CREATE TABLE IF NOT EXISTS `pilots` ( `id` mediumint(5) unsigned NOT NULL AUTO_INCREMENT, `game` tinyint(3) unsigned NOT NULL DEFAULT '0', `last_move` int(10) NOT NULL DEFAULT '0', UNIQUE KEY `id` (`id`), KEY `last_move` (`last_move`), KEY `game_id_lastmove` (`game`,`id`,`last_move`) ) ENGINE=MyISAM DEFAULT CHARSET=latin1 AUTO_INCREMENT=8 ; CREATE TABLE IF NOT EXISTS `ships` ( `id` mediumint(5) unsigned NOT NULL AUTO_INCREMENT, `game` tinyint(3) unsigned NOT NULL DEFAULT '0', `pilot` mediumint(5) unsigned NOT NULL DEFAULT '0', `sector` smallint(5) unsigned NOT NULL DEFAULT '0', `hull` smallint(4) unsigned NOT NULL DEFAULT '50', UNIQUE KEY `id` (`id`), KEY `game` (`game`), KEY `pilot` (`pilot`), KEY `sector` (`sector`), KEY `hull` (`hull`), KEY `game_2` (`game`,`pilot`,`sector`,`hull`) ) ENGINE=MyISAM DEFAULT CHARSET=latin1 AUTO_INCREMENT=8 ; The explain: id select_type table type possible_keys key key_len ref rows Extra 1 SIMPLE p ref id,game_id_lastmove game_id_lastmove 1 const 7 Using where; Using filesort 1 SIMPLE s ref game,pilot,sector... game_2 6 const,fightclub_alpha.p.id,const 1 Using where; Using index edit: I cut some of the unnecessary pieces out of my queries/table structure. Anybody have any ideas?

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• Updating Checked Checkboxes using CodeIgniter + MySQL

  - by Tim

  Hello I have about 8 check boxes that are being generated dynamically from my database. This is the code in my controller //Start Get Processes Query $this->db->select('*'); $this->db->from('projects_processes'); $this->db->where('process_enabled', '1'); $data['getprocesses'] = $this->db->get(); //End Get Processes Query //Start Get Checked Processes Query $this->db->select('*'); $this->db->from('projects_processes_reg'); $this->db->where('project_id', $project_id); $data['getchecked'] = $this->db->get(); //End Get Processes Query This is the code in my view. <?php if($getprocesses->result_array()) { ?> <?php foreach($getprocesses->result_array() as $getprocessrow): ?> <tr> <td><input <?php if($getchecked->result_array()) { foreach($getchecked->result_array() as $getcheckedrow): if($getprocessrow['process_id'] == $getcheckedrow['process_id']) { echo 'checked'; } endforeach; }?> type="checkbox" name="progresscheck[]" value="<?php echo $getprocessrow['process_id']; ?>"><?php echo $getprocessrow['process_name']; ?><br> </td> </tr> <?php endforeach; ?> This generates the checkboxes into the form and also checks the appropriate ones as specified by the database. The problem is updating them. What I have been doing so far is simply deleting all checkbox entries for the project and then re-inserting all the values into the database. This is bad because 1. It's slow and horrible. 2. I lose all my meta data of when the check boxes were checked. So I guess my question is, how do I update only the checkboxes that have been changed? Thanks, Tim

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• NHibernate and mysql timestamp

  - by HeavyWave

  I am trying to do versioning with NHibernate and everything works fine, however right after the insert NHibernate tries to pull the generated timestamp by executing the following query: SELECT profileloc_.Updated as Updated14_ FROM profile_locale profileloc_ WHERE profileloc_.id=?p0 and profileloc_.culture=?p1;?p0 = 16, ?p1 = 1033 Which is totally wrong, as it will pull out all versions starting with the first one. How do I make it add ORDER BY Updated DESC to this query? I am using Fluent NHibernate for mappings.

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• MYSQL - Group by limit

  - by jono2010

  Hello Is there a simple way to LIMIT the GROUP BY results to the top 2. The following query returns all the results. Using 'LIMIT 2' reduces the overall list to the top 2 entries only. select distinct(rating_name), id_markets, sum(rating_good) 'good', sum(rating_neutral)'neutral', sum(rating_bad) 'bad' from ratings where rating_year=year(curdate()) and rating_week= week(curdate(),1) group by rating_name,id_markets order by rating_name, sum(rating_good) desc Results in the following :- poland 78 48 24 12 <- keep poland 1 15 5 0 <- keep poland 23 12 6 3 poland 2 5 0 0 poland 3 0 5 0 poland 4 0 0 5 ireland 1 9 3 0 <- keep ireland 2 3 0 0 <- keep ireland 3 0 3 0 ireland 4 0 0 3 france 12 24 12 6 <- keep france 1 3 1 0 <- keep france 231 1 0 0 france 2 1 0 0 france 4 0 0 1 france 3 0 1 0 Thanks Jon

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• how to make a queue in php with mysql

  - by robert

  hy, in my script i run a exec() function to make a movie file with ffmpeg. the problem is ffmpeg can run only 1 time on the server, if 2 people are online on server and first one already run ffmpeg i want the second to wait until the first end the process how to code this? thank you

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• stored procedure in MYsql access in PHP

  - by xcodemaddy

  Hi.. I am creating stored procedure ,here code : CREATE PROCEDURE `dbnm`.`getlogin` ( IN uid INT, IN upass VARCHAR(45) ) BEGIN if exists(select uphno,pass from user_master where uphno=uid and pass=upass)then ***true else ***false end if; END $$ DELIMITER ; i want return value(**true or **false) in stored procedure from PHP by calling sp PHP code: $res = $mysqli->query('call getlogin("1","rashmi")'); how to acesss boolean value in PHP from sp? Thanks

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• Delete, Truncate or Drop MySQL question

  - by Pete Herbert Penito

  Hi Everyone! I am attempting to clean out a table but not get rid of the actual structure of the table, i have the following columns: id, username, date, text the id is auto incrementing, I don't need to keep the ID number, but i do need it to keep its auto-incrementing characteristic. I've found delete and truncate but I'm worried one of these will completely drop the entire table rendering future insert commands useless. Thank you, Everybody!

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• MySQL Student database beginner SQL employment expectations

  - by sammysmall

  Background, Student pursuing BSIT degree, employer expectations, entry level. I would like to solicit opinions from this forum as to what your professional expectations are as regards an entry level position in working in the database realm... I see many job opportunities that require a minimum of 2 or more years experience, how does one go about obtaining this experience (I have tried very hard to maintain a minimum 3.70+ GPA) but have ZERO work experience in this field... I spend non school time working in VB and SQL to try and increase my proficiency. I have considered postponing my job search until I obtain certifications from brainbench etc... Any criticism and or advise is welcomed... Again I have no experience in database other than undergrad work in class. Thank you for your time sammysmall

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• Deleting huge chunks of data from mysql innodb

  - by ming yeow

  I need to delete a huge chunk of my data in my production database, which runs about 100GB in size. If possible, i would like to minimize my downtime. My selection criteria for deleting is likely to be DELETE * FROM POSTING WHERE USER.ID=5 AND UPDATED_AT<100 What is the best way to delete it? Build an index? Write a sequential script that deletes via paginating through the rows 1000 at a time?

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• MySQL REGEXP: matching blank entries

  - by Erwin Paglinawan

  Hi, I have this SQL condition that is supposed to retrieve all rows that satisfy the given regexp condition: country REGEXP ('^(USA|Italy|France)$') However, I need to add a pattern for retrieving all blank country values. Currently I am using this condition country REGEXP ('^(USA|Italy|France)$') OR country = "" How can achieve the same effect without having to include the OR clause? Thanks, Erwin

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• Why mysql is not storing data after "#" character?

  - by Nitz

  Hey Friends, I have made one form in which there is rich text editor. and i m trying to store the data to database. now i have mainly two problem.. 1) As soon as the string which contents "#"(basically when i try to change the color of the font)     character, then it does not store characters after "#". and it also not store "#" character also. 2) although i had tried....in javascript html.replace("\"","'"); but it does not replace the double quotes to single quotes.

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