MySQL :: Every 30 Seconds -- Reconnecting After A Failed Master Event Read

Multiple Table Joins To Create Master Event List For Sorting
I am making a calendar application for my website. I have one master "events" table which has all the information for all the events - this part isn't difficult. The hard part is syndicating the appropriate events to each user (everything is customizable). There are three "intermediate" tables which connect users with the events. Joining these tables with the master table (individually) to get the event information isn't difficult. It is however, very difficult to join all of them at once to get a master selection.

I want to be able to sort all the events syndicated to a specific user by date from all three intermediate tables. How would I go around doing this? Here is a layout of the databae:

Class_events
network_id
grade
event_id

EC_events
network_id
ec_id
event_id

school_events
network_id
event_id

events
event_id
all the event information stuff in this table

Posted: February 22, 2010, 10:18:03 PM

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Design - Read From Slave And Update On Master
By design,all read should be from slave,and update on master, but consider the following situation: there is a column water_mark in table_a, and I need to read from table_b whose column time_mark is larger than column water_mark of table_a, If I read from slave,then update the column water_mark to "now()" in master, what if there is a big delay between slave and master?

Posted: Jun 4 09 at 3:00

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Mysql Master/Slave Read Write To Database Question
If I setup my database as master/slave and user enters data into the html form. This data is written to the master database. After html form submission user is directed to view.html to view the submitted data. The view.html page does the read from the slave. Would it be safe to assume that the data that user submitted would be written to master and immediately displayed in the view.html by reading slave data base?

Posted: Nov 15, 2007, 10:47

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Seconds Between 2 Dates - Why Does Seconds Jump By 40 Seconds?
I have a table for my sessions and basically i wanna check seconds between NOW() and when it was created.

I noticed that at every minute the seconds would jump by at least 40 seconds for every minute.

So if i created a new sesson on my site and Log NOW() into created

then i try doin SELECT (NOW() - created) AS created_sec

I was monitoring it because my site would log me out all the time. So I noticed at every minute it seems that it always jump 40seconds or more for every minute.

Here is table:...

Posted: April 08, 2009 08:57AM

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Slow Log File Has Times In Whole Seconds But Mysqldumpslow Has Fractions Of Seconds?
When I look at the mysql-slow.log file itself that I've set up, it lists times in whole seconds. However, when i run mysqldumpslow to parse that same log file, it shows times in fractions of seconds. The info from mysqldumpslow seems correct, but I can't figure out where it gets its info. Where is it coming from?

Posted: March 11, 2008 03:01PM

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Table - Reduce Query Execution Time From 90 Seconds To 5 Seconds?
I am using MySQL database. When I execute a query which the main table(20 thousands of rows) is joined with the other 5 tables, it takes 90 seconds to return me the result. I then added indices into each of the criteria(where clause). Then the execution time drops from 90 seconds to 45 seconds and then I tried to select only necessary fields instead of all(*), it takes 25 seconds. What should I do to make it drop to less than 5 seconds or even one second?

SELECT
ap.propertyid, ap.type_market,
ap.market_sale_price, ap.sale_from, ap.sale_until, ap.property_salepsf,
ap.rent_from, ap.property_rent_until, ap.property_rentpsf, ap.title,
ap.street, ap.suburbs, ap.state, ap.bedrooms, ap.bathrooms, ap.carport,
ap.buildup_area, ap.builtup_area_from, ap.builtup_area_to,
ap.land_area, ap.land_area_from, ap.land_area_to,
ap.status AS prop_status, ap.datecreate AS uploadedOn, type_property.name, (
SELECT name
FROM gallery
WHERE
propertyid = ap.propertyid
ORDER BY frontpage
LIMIT 0, 1
) AS picture,
uom_mst.uom_shortcode,
agent_profile.person, agent_profile.mobile, agent_profile.electronicmail, agent_profile.agent_pix, agent_profile.agent_pix_crop,
country.country_currency_html AS currency,
owner_profile.oname, owner_profile.omobile, owner_profile.oemail
FROM agentproperty ap
LEFT JOIN agent_profile ON (ap.agentid = agent_profile.agentid)
LEFT JOIN type_property ON (ap.type_property = type_property.rid)
LEFT JOIN uom_mst ON (ap.property_bua_uom = uom_mst.uom_id)
LEFT JOIN country ON (ap.property_ctry = country.country_id)
LEFT JOIN owner_profile ON (ap.propertyid = owner_profile.propertyid)
WHERE
ap.status = 'active' AND
agent_profile.status = 'active' AND
ap.property_type = '1' AND
getCompanyID(ap.propertyid) = '001' AND
ap.agentid = '100010001'
GROUP BY ap.propertyid
ORDER BY ap.datecreate DESC
LIMIT 200, 10

Posted: Sep 15 10 at 10:59

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Java - Losing Connection After A While And Not Reconnecting?
I'm developing a standalone server which uses JPA+Hibernate to access a MySQL database.

When I start the server, everything is working fine. However, after a while (usually the next morning, if I start it in the afternoon) it will stop working because apparently the connection to MySQL was closed (I see lots of SocketExceptions in the logs). This is probably caused by idling, the server is in development and nobody uses it at night. I thought Hibernate, JDBC or some other layer below my app would manage the connection and reopen it if neccessary, but apparently not. Is there a configuration parameter I missed?

persistence.xml

http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd"
version="2.0">
<persistence-unit name="manager">
<class>example.data.entities.User</class>
<class>example.data.entities.Player</class>

[Code]...

Posted: Feb 20 at 21:19

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Efficiently Connect To Db In Php Without Reconnecting On Every Query?
I'm pretty sick of having to rewrite my code every time I learn something new about php (like the fact that mysql connections cannot be passed around in a session as a handle).

How do you implement mysql connection in your projects? A lot of people have proposed "connection pooling", but after reading the manual i'm still lost. It's like: "connection pooling is mysql_pconnect!" - me: "and...? how is that any different in reality? can you pass around a mysql_pconnect in a session? why is this seemingly mysterious aura??"

Let me explain my situation. I have a function called "query1":

function query1($query)
{
$db = new mysql(HOST,USER,PASS,DBNAME);
$result = $db->query($query);
$db->close();
return $result;
}

This is seems like a squanderous and inefficient way of querying a db (especially since you need a mysql handle for functions like mysql_real_escape_string). What is the correct form to do it?

Posted: Jan 24 10 at 22:29

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Java - Db Not Reconnecting With JNDI Tomcat 6?
I am using JNDI with Tomcat6 to manage Mysql connections, my Catalina/domain.com/ROOT.xml has:

<Resource name="jdbc/db" auth="Container" type="javax.sql.DataSource"
username="db1" password="somepass" driverClassName="com.mysql.jdbc.Driver"
url="jdbc:mysql://localhost:3306/db?autoReconnect=true" maxActive="15" maxIdle="3"
maxWait="5000" removeAbandoned="true" removeAbandonedTimeout="20" />

I though autoReconnect will do the job reconnecting to database but it does not, after about 8 hours of inactivity my app spits out lost connection to database errors.

Posted: Dec 3 09 at 20:38

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Master Master Replication, Truncate Table Fails, Version 5.0.22
I have set up a master master replication link between two databases, prototyping an idea. Anyhow, adding records and deleting works, both get updated, creating and dropping tables works, but truncating tables doesn't work.

My main questions are, why doesn't truncate work, and if it doesn't work, what else doesn't work across a master-master replication link?

Posted: November 15, 2007 08:06AM

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CREATE EVENT From Stored Procedure With A Random Event Name?
I want to EXEC from MySQL Stored Procedure a CREATE EVENT sql. I cannot use PREPARE because CREATE EVENT is not allowed in PREPARE, and I want to use a random name, as I need to create a unique event, and I need to pass some date params in the DO section. MySQL doesn't have EXEC. the SQL is built like this:

SET @sql=CONCAT('CREATE EVENT myevent',md5(concat(@dt1,@dt2)),' ON SCHEDULE AT CURRENT_TIMESTAMP + INTERVAL 0 SECOND
DO
call genRoutes(''',@dt1,''',''',@dt2,''');
');

The generated @sql query looks like: CREATE EVENT myeventcadb1e41722fb3c9b2e6992e740d76ca ON SCHEDULE AT CURRENT_TIMESTAMP + INTERVAL 0 SECOND DO call genRoutes('2011-04-07 00:00:00','2011-04-14 00:00:00'); Server version 5.1.31-community. How to do this in Stored Procedure?

Posted: Mar 9 at 17:53

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Database - Auto-increment On Master-master Replication?
I had a auto-increment duplication issue for master-master replication. Then, I set:

SET GLOBAL SQL_SLAVE_SKIP_COUNTER = 99999;

This skips 9999 queries. Then I did:

SHOW SLAVE STATUSG
Slave_IO_Running: Yes
Slave_SQL_Running: Yes

And it seems to be running OK. But, of course, since I skipped 99999 statements...if I make a change on Database 1, it will not reflect it on Database 2...until 99999 statements are passed. Correct?

Well...I created a script to automatically insert 999999 rows into a dummy table. This should be more than enough , right? And my 2 databases should be in sync again??? But, I am on my 3 millionth row, and it doesn't seem to be working. My Database 2 still does not have these 3 million rows that I just created on Database 1.

Posted: Dec 8 09 at 21:34

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Replication - Re Sync Master DB With Slave Changes If Master Goes Offline?
Mysql Server 1 is running as master.
Mysql Server 2 is running as slave.

So with both DBs online, they are in "perfect sync". If slave goes offline there's no problem if master still online - they sync once slave becomes online. Beside the server configuration, I redirected the connection (with JSP code) for the slave DB if the master goes offline (I tested of course with /etc/init.d/mysqld stop). When the master goes back online, there's any automatic method to sync the master with slave updates?

Posted: May 15 at 16:15

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Php - Query Failed: Connection To Localhost: 3306 Failed In Sphinx
I'm trying to use the sphinx api to grab some data from a mysql db, but I keep getting this error when I load it on my browser.

Query failed: connection to localhost:3306 failed (errno=4, msg=). I had no luck when I tried changing the port number to 3312, and a few others.. I was actually able to get results for queries through linux command, but the error occurs when I try it (using the sphinxapi.php file) on my browser

code:......

Posted: Dec 4 10 at 8:08

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Master-master Replication For A Database Of Four Tables?
I have to try out a master-master replication for a database of four tables. Both the master can write at once, but they would not be updating the same rows of a table and the insertions will also be collision free. The replication should be asynchronous Is this behaviour possible to implement? If so, do I have to write my own code to manage replication or can mysql's existing replication protocol manage this.

Posted: Sep 28 10 at 19:26

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Master-Master Replication For Single Table?
I been required to set up a master-master replication accross different database but the key is that the two database must have replication only across single table which is common to both the datasases(User).

Is there a way to achieve this.Also the the two databases need not contain same tables apart from "users" tables which need to be replicated with the master database

Posted: January 08, 2010 05:03AM

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X Rows Fetched In Y Seconds (Z Seconds)
I'm running some queries in Query Browser and Workbench from an MySQL server that is on my localhost. In both cases it tells me how long the queries take to run. In Query Browser it says "X rows fetched in Y s (Z s)". From googling I found that Y is the length of time to execute the query and Z is the time the result set spent in transit from the server to the client. What I find interesting is that sometimes Y is much larger than X. For instance it may take 0.0046s for the execution by 3.5426s for transit. It's only returning 1 row and I'm on the local computer so I don't understand why the transit is so long.

Posted: February 23, 2010 04:10PM

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Master/Master Replication Problems
I was wondering whether someone could help me.

I have inherited set of replicated servers from a guy I used to work with, basic set up is:

Master1/Slave2 - Server ID 1
Master2/Slave1 - Server ID 2

When I looked at the logs it looks as though Server ID 2 is well out of step. Having looked at the slave status it appears that that Slave_SQL_Running state is set to No and a particular piece of SQL is causing the problem. Having ran the SQL on the particular server it has now problem at all.

Now my understanding of this type of set up is that Server ID 1 writes directly to Server ID 2, then Server ID 1 is in turn replicated to.

But for the life in me, I cannot understand why this piece of SQL is causing the problem. Can anyone offer me any ideas on how I can best get to the bottom of this, I'm really struggling with this. There was me thinking replication just worked!

Is there an ability to get MySQL to log all queries it is running, so I can get to the bottom of all queries currently being executed?

Posted: Apr 24, 2007, 04:37

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Auto Increments In Master-Master?
I'm trying to create a semi-load balanced failover setup and I have a question about the way a Master-Master environment handles Auto incremented values.

I understand by reading the doc that you need to have the off sets different, ServerA creating even and ServerB create odd values for example, however if you use a Master-Master setting where you only write to ServerA how does ServerB log the auto incremented values?

IE: ServerA used for writing, ServerB used for reads. ServerA fails due to Hardware crash. Programs that write to ServerA shift to write to ServerB. Will ServerB at that point pick up where ServerA left off? Say ServerA was at value 200 will ServerB start at 201 or 1?

Posted: June 19, 2009 08:32AM

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Master Master Replication Of Db With Big Partitioning?
I am investigating the possibilites to upscale with MySQL. We've looked into Cassandra and MongoDB but the read performance is too low compared to MySQL so we are now looking to do it all in MySQL.

We have a myisam table in a db which has 500 partitions by key (max rows: 50M so 100.000 rows per partition). 100.000 rows is about 1Gb of data including indexes. This in a single node is no problem. No for our challenge:

The reads on this table are about 1,000 per second...BUT the writes are about the same!!
We want to replicate the database using a master-master setup (=ndb cluster) using up to 10+ nodes. A master with 10 slaves is not good with so much writes so we hope master-master replication is.

My questions: - is this setup even possible? - is there a better solution (we need to keep the read performance very very high and be able to update/write on the same without disturbing the read performance)

Posted: July 1st, 2010, 04:52 AM

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Recall All Rows With Type Of "event" Where "when" - "time()" Or Basically Any Event That Takes Place In The Future
I have a table in my MySQL database that looks like the following

banner
--------
id : bigint(20)
name : varchar(75)
type : set('news','event')
link : bigint(20)
when : int(10)

What I want to do is I want to be able to recall all the rows with the type of "news" but I only want to recall all of the rows with the type of "event" where 'when > time()' or basically any event that takes place in the future RECAP: recall all NEWS items recall only EVENTS that happen in the future I'm running the SQL query using PHP as the scripting language.

Posted: Oct 1 09 at 23:29

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MySql : Implement A Sort Of "read/not Read Yet" Topics?
I'm about to implement a list of topic/argument in my forum, and I'd like to insert a sort of flag like "read/not read yet" for each message, regard each user in my website.I think at somethings like this : a table watched_topics with id(INT), user(VARCHAR) and topic_id(INT). When a user watch the page, I'll insert (if the data doesn't exist) these information.When another user will insert a new message in a topic, I'll delete from the table watched_topics all line with that topic_id.That could provide a trouble : Think about to 9000 topics and 9000 users that have watched all topics : the table will be so big (9000x9000=81000000).o, I think is not the best strategy to implement this kind of stuff! Any suggestion would be appreciated :)

Posted: Jan 28 at 10:50

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Create A Separate Set Of Privileges For A Database That Contains Both "read Only" Tables And "read Write" Tables
I am trying to create a separate set of privileges for a database that contains both "read only" tables and "read write" tables. To be more specific, the database contains 10 tables that I want the user to only read from (i.e. select only).

It also contains around 30 tables which the user is free to read and write to and from. Lastly, I would also like the user to be able to create/drop/alter tables created by him thus granting him full access to his own tables under the same database. Is something like this possible? I have tried to think of the ways I can use GRANT but my head is getting stuck.

Posted: Oct 13 10 at 15:50

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Every 30 Seconds -- Reconnecting After A Failed Master Event Read

Every 30 seconds -- Reconnecting after a failed master event read ....