trick trigger
I am working on an app to allow a committee to schedule classes. The members of the committee can all update the database by changing the time or the instructor for a class. I have to write an app to warn them when they've scheduled an instructor for 2 classes at the same time or if they've scheduled any of a large list of classes at the same time. For example, they shouldn't schedule Calculus 212 at the same time as Physics 302 because a student might want to take both classes. And obviously, they shouldn't schedule Professor Higgenbothom to teach both Calculus 212 and Probability 278 at 10:00 AM on Monday, Wednesday, and Friday. The problem isn't actually writing mysql to select the conflicts. The problem is when and how to run the code. I could put it in a trigger but say someone assigns Dr. Higgy to teach Calc 212 at 10 AM MWF. They need to be able to see that he is now scheduled for another class if they look at Probability 278. Get the problem? An update to one record can necessitate an update to any number of other records. I'm just looking for basic suggestions on how you'd deal with this. Should I attempt to write a trigger that updates both Calc 212 and Physics 302 when either is changed? Am I going to create an infinate loop? I am thinking of telling the committee that it can't be done and they'll have to wait for the list of conflicts to be recalculated by a background process once an hour or so. My current database structure is that there is a link table for conflicts. If Calc 212 is scheduled at the same time as Physics 302, that is shown by there being 2 records in a conflicts table. The conflicts table would contain a record with the primary key for Calc 212, the pkey for Physics 302, and a code indicating that its a course conflict. There'd also be a record for Physics 302 indicating that it has a conflict with Calc 212. If Prof. Higgy is also scheduled to tach Calc 212 and Probability 278 at the same time, that would also create 2 records in the conflicts table. Like this: calc212 | phys302 | course_conflict phys302 | calc212 | courseConflict calc212 | prob278 | instructorConflict prob278 | calc212 | instructorConflict Then my web app can do a select for conflicts when displaying Calc 212, Probabbility 278, or Physics 302. But how to get that data into the table? I'm thinking of trying to write a trigger so that wen a class record is updated, the trigger deletes the conflicts records for the class if the id appears in either column 1 or column 2, re-calculate conflicts, and re-add the conflicts records. But if anybody has basic suggestions for a completely different approach, I'd like to hear them. -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql
efficient use of varchar?
Does it make any difference if I allocate a particular number of bytes for a varchar? I mean, just as an example, maybe its more efficient to use a power of 2 as the field length. Or maybe power of 2 minus 1. I'm guessing not and that anything less than 255 is the same. I'm converting some data in a spreadsheet and I have to create a table with about 150 columns. So I created all the columns varchar(255) and now I'm asking mysql to show me the longest value in each column. SELECT MAX(LENGTH(column99)) FROM TABLE99. Then I've been modifying the CREATE TABLE code to accomodate the longest value plus a little more. So if the longest value in the column is 38 characters, I'd probably make that a VARCHAR(50). But maybe I might as well make that 63 or 64. Or maybe I'm wasting my time and should leave them all 255. -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql?unsub=arch...@jab.org
Re: getting procedure code via mysqldump
From: Claudio Nanni claudio.na...@gmail.com To: Shawn Green (MySQL) shawn.l.gr...@oracle.com Cc: John G. Heim jh...@math.wisc.edu; my...@lists.mysql.com Sent: Wednesday, March 30, 2011 2:01 AM Subject: Re: getting procedure code via mysqldump In case you use a linux or unix system, to strip off the comments in linux bash is very easy, you can use this simple bash command: grep -v ^/\* yourdumpfile.sql yourdumpfilewithoutcomments.sql That didn't work because there are comments embedded in the line that creates the procedure. For example: /*!50003 CREATE*/ /*!50020 DEFINER=`root`@`localhost`*/ /*!50003 PROCEDURE `TIMETABLE_SYNC`() That's all one line. It will probably wrap in my message. But the line begins with a /* so its removed by your grep command. -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql?unsub=arch...@jab.org
getting procedure code via mysqldump
I would like to use mysqldump to get a copy of the code for a stored procedure in a format that is similar to the code I used to create it. The problem is that I'm blind and I have to listen to the code to debug it. I think I have a file containing the code that I used to create the stored procedure but I want to make absolutely sure. This is what I've tried: mysqldump --p --routines --no-create-info --no-data --no-create-db --skip-opt --skip-comments --compatible=ansi --result=routines.sql database My problem is that generates a file with a lot of lines I don't understand. for example: /*!50003 CREATE*/ /*!50020 DEFINER=`root`@`localhost`*/ /*!50003 PROCEDURE `TIMETABLE_SYNC`() That appears to be the line to create the stored procedure 'timetable_sync'. But what's with all the other stuff on that line? Can i get rid of it? -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql?unsub=arch...@jab.org
Temporary tables created on disk: 99%
On my db server, mysql has 2 gigabytes for temporary tables and yet its creating 99% of temporary tables on disk. According to mysqltuner, 99% of temporary tables are created on disk. I've confirmed this via the show global status like 'created%' command. This is in spite of having the following in my my.cnf: tmp_table_size = 2G max_heap_table_size = 2G I have confirmed these values are really being used via the show variables like command. So there's no typo in my my.cnf. Mysqltuner says Temporary table size is already large - reduce result set size but that is not a practical suggestion in that none of the programs using the databases on the server were written by me. I have databases for spamassassin bayesian rules, horde3 imp (webmail) and moodle on the system. I am not about to try to modify their code. I'm running mysql from debian stable (5.0.1). I've double and triple checked the documentation and it sure looks as if setting tmp_table_size and max_heap_table_size to be very large should eliminate this problem. But it doesn't seem to work. I just have to be missing something. But what? My complete my.cnf is below. PS: I have another server that is serving only drupal and it too is creating a high percentage of temp tables on disk (75%). I figure the same setting is missing and/or wrong on both servers. # # The MySQL database server configuration file. # # You can copy this to one of: # - /etc/mysql/my.cnf to set global options, # - ~/.my.cnf to set user-specific options. # # One can use all long options that the program supports. # Run program with --help to get a list of available options and with # --print-defaults to see which it would actually understand and use. # # For explanations see # http://dev.mysql.com/doc/mysql/en/server-system-variables.html # This will be passed to all mysql clients # It has been reported that passwords should be enclosed with ticks/quotes # escpecially if they contain # chars... # Remember to edit /etc/mysql/debian.cnf when changing the socket location. [client] port = 3306 socket = /var/run/mysqld/mysqld.sock # Here is entries for some specific programs # The following values assume you have at least 32M ram # This was formally known as [safe_mysqld]. Both versions are currently parsed. [mysqld_safe] socket = /var/run/mysqld/mysqld.sock nice = 0 [mysqld] # # * Basic Settings # user = mysql pid-file = /var/run/mysqld/mysqld.pid socket = /var/run/mysqld/mysqld.sock port = 3306 basedir = /usr datadir = /srv/mysql tmpdir = /tmp language = /usr/share/mysql/english skip-external-locking # # Instead of skip-networking the default is now to listen only on # localhost which is more compatible and is not less secure. #bind-address = 127.0.0.1 # # * Fine Tuning # # Commonly used optimization parameters # tmp_table_size = 2G max_heap_table_size = 2G key_buffer = 2G max_allowed_packet = 16M thread_stack = 128K thread_cache_size = 256 # This replaces the startup script and checks MyISAM tables if needed # the first time they are touched myisam-recover = BACKUP max_connections= 256 table_cache= 1024 thread_concurrency = 16 open_files_limit = 8192 # # * Query Cache Configuration # query_cache_limit = 16M query_cache_size= 512M # # * Logging and Replication # # Both location gets rotated by the cronjob. # Be aware that this log type is a performance killer. #log = /var/log/mysql/mysql.log # # Error logging goes to syslog. This is a Debian improvement :) # # Here you can see queries with especially long duration # To see slow queries, use 'show processlist' log_slow_queries = /var/log/mysql/mysql-slow.log long_query_time = 2 log-queries-not-using-indexes # # The following can be used as easy to replay backup logs or for replication. # note: if you are setting up a replication slave, see README.Debian about # other settings you may need to change. #server-id = 1 #log_bin = /var/log/mysql/mysql-bin.log expire_logs_days = 10 max_binlog_size = 100M #binlog_do_db = include_database_name #binlog_ignore_db = include_database_name # # * BerkeleyDB # # Using BerkeleyDB is now discouraged as its support will cease in 5.1.12. skip-bdb # # * InnoDB # # InnoDB is enabled by default with a 10MB datafile in /var/lib/mysql/. # Read the manual for more InnoDB related options. There are many! # You might want to disable InnoDB to shrink the mysqld process by circa 100MB. #skip-innodb innodb_buffer_pool_size = 2G # # * Security Features # # Read the manual, too, if you want chroot! # chroot = /var/lib/mysql/ # # For generating SSL certificates I recommend the OpenSSL GUI tinyca. # # ssl-ca=/etc/mysql/cacert.pem # ssl-cert=/etc/mysql/server-cert.pem # ssl-key=/etc/mysql/server-key.pem [mysqldump] quick quote-names max_allowed_packet = 16M [mysql] #no-auto-rehash # faster start of mysql but no tab completition [isamchk] key_buffer = 16M # # * NDB Cluster # # See
spamassassin database
Right now I have the spamassassin bayesian rules database in mysql myisam tables on our mail server. I want to move it to our database server. Mysqltuner tells me that the read/write ratio is 10/90. 90% writes. Given a database that is doing 90% writes, what database engine should I use? -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql?unsub=arch...@jab.org
mysql RAID
Hi, I am working on configuring a new hardware database server. I'm a little confused as to what to do about disk. We have several mysql databases but by far the 2 most active are spamassassin bayesian rules and horde3/imp web mail. Both do a lot of updates. The bayesian rules are added to each time a spam message comes in for any of our 200 users. And the horde3/imp writes address book updates and preferences quite often. I have read (and have been told) to stay away from RAID-5 for update-intensive systems. Are there performance concerns with RAID-10 as well? We will be buying from Dell (done deal for reasons too complicated to go into) and the disks they're selling are 146 Gb. I can get up to 8 of them in the server we're buying. I asked them about just getting 2 big disks and going with RAID-1. My understanding is that with RAID-10, the system can do multiple reads and writes simultaneously so throughput is improved oversystems w/o RAID or with RAID-1. But the same logic would apply to RAID-5 only it doesn't work out that way. I just want to make sure I'm configuring this system correctly before I order it. -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql?unsub=arch...@jab.org
how things get messed up
About 5 years ago, I was asked to write a php app for my department. The app keeps track of graduate school applicants to my department at the university. The main data elements are the scores each professor gives to each applicant. There are only about 400 applicants each year so even with all the personal data, scores, transcripts, etc for each student, it's not much. for the first 2 years, it was under a meg of data. Well, then the selection committee asked me to add something so that if a student e-mailed the department a document, say a paper he'd written or a photo of himself, or whatever, it could be tacked on to the info they saw about him while grading the applicant. So I said, Well, there is only going to be maybe 10 or 20 of those a year. And even if all 400 applicants submit a PDF of a paper they'd written, it would be only 400 docs. 4,000 after 10 years. Yeah, lets just create a documents table in the database and store them in mysql. For the first 2 years, only 2 students sent in documents to attach to their application. I figured I'd wasted my time. Then the next year, the graduate school changed their web application form to allow students to upload documents. Fine, I said, My worst case scenario has already come true. But, well, this is why you plan for the worst case. Then they started taking letters of recommendation as PDF documents. In fact, they started requiring PDF docs. Each student has 3 to 6 letters of recommendation. All in all, I figure we're at about 100 times as many docs in our database as I originally expected and about 10x my worst case scenario. I should either be fired or shot. Maybe fired *then* shot. Actually, its not as bad as all that. I can pretty easily write a perl script to export the docs to files and access them via a network mounted filesystem. After all, saving myself 5 hours of work 5 years ago is worth what? -- maybe 10hours today? It is amazing how often quick dirty turns out just being dirty in the end. -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql?unsub=arch...@jab.org
Re: 50 things to know before migrating from Oracle to MySQL
Hmmm... I find it suspicious that there are *exactly* 50 things you need to know before migrating from oracle to mysql. Not 49. Not 51. Exactly 50. Well, he did repeat that clustering is not what you think it is so I guess it technically is 49. But I wonder what would happen if he thunk up a 51st thing or if somebody emailed him one more thing. - Original Message - From: Carl c...@etrak-plus.com To: mysql@lists.mysql.com Sent: Thursday, January 28, 2010 4:56 PM Subject: Re: 50 things to know before migrating from Oracle to MySQL A quick Google turned up http://www.xaprb.com/blog/2009/03/13/50-things-to-know-before-migrating-oracle-to-mysql/ Man, I love Google. Thanks, Carl - Original Message - From: Daevid Vincent dae...@daevid.com To: mysql@lists.mysql.com Cc: 'changuno ' chang...@rediffmail.com Sent: Thursday, January 28, 2010 5:49 PM Subject: RE: 50 things to know before migrating from Oracle to MySQL -Original Message- From: John Meyer [mailto:johnme...@pueblocomputing.com] Sent: Thursday, January 28, 2010 2:16 PM To: mysql@lists.mysql.com On 1/28/2010 3:21 AM, changuno wrote: Read a blog which states 50 things to know before migrating from Oracle to MySQL. Any comments on this? would it have been too much to just link to it? Thought the same thing. Not only that, it would have been PREFERRED, so I can BOOKMARK it and SHARE it with my other colleagues. -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql?unsub=c...@etrak-plus.com -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql?unsub=jh...@math.wisc.edu -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql?unsub=arch...@jab.org
Re: optimization
From: Jaime Crespo Rincón jcre...@warp.es Sent: Monday, January 25, 2010 5:30 PM 2010/1/25 John G. Heim jh...@math.wisc.edu: I have a server with 16Gb of RAM and a dual-core 2Ghz processor. It is running the latest mysql-server from debian lenny (5.0.1). I have databases for drupal, moodle, spamassassin, horde3, and a small database for departmental stuff. The problem is that inserts/updates are sometimes very slow, on the order of a minute. I am hoping somebody can sspot something wrong in my config. Here's the optimization settings section (for your convenience). The whole my.cnf is reproduced below that: Are your databases using MyISAM or InnoDB? Both. Maybe that's the problem? I started creating database tables for my own web apps with the default mysql configuration. I believe the default database engine is MyISAM. But then I wanted to use foreign keys and I saw that it required me to use InnoDB. So I converted some tables to InnoDB but not all. Maybe it was a mistake not to convert all of them. After that, I installed drupal, moodle, and mediawiki. I haven't looked at what kind of tables those packages create. They may not specify it and the default is still whatever it is when you install mysql, MyISAM I think. * If MyISAM, you could be suffering contention problems on writes because of full table locks. No easy solution but engine change or database sharding. Also key_buffer, (and the other buffers) coud be too small for 16GB of RAM. Are you really using more thant 10% of it? You could also disable other engines if unused. * If InnoDB, you have not set innodb_buffer_pool_size nor log size. You could increase the pool to 50% of ram available. Those are very general suggestions. It depends a lot on your hardware (slow storage?), other apps installed on the same machine or the load of the server, among others. Well, it could be that the disks aren't real fast. The server is also running a print server (lprng). I don't think that's very CPU intensive but it might be slowing down writes. -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql?unsub=arch...@jab.org
Re: optimization
Just to be clear, you're suggesting I convert all of the spamassassin, drupal, and mediawiki tables to innodb too? Or just my own database? What about the mysql database itself? I wouldn't convert those tables, would I? - Original Message - From: Keith Murphy bmur...@paragon-cs.com To: mysql@lists.mysql.com Sent: Tuesday, January 26, 2010 11:06 AM Subject: Re: optimization ♫ I would recommend the same to you about reading High Perf. MySQL as Baron, et al wrote a great book about performance on MySQL. That being said, it has been my experience that in 99% of client cases they don't really need to run two different types of tables. If I were you, I would use InnoDB exclusively unless there is legitimate reason to do otherwise. In an environment that is running 25% writes and a decent query rate you are bound to have contention issues with MyISAM. While there are always going to be edge cases for MyISAM, your default should be innodb and your config should reflect this. Changing your tables to InnoDB is a simple ALTER TABLE which you can script if there are a number of tables to convert. Allocate as much of your available RAM as possible to the innodb_buffer_pool (typically 50 - 80% of total RAM) and I bet you would see a dramatic difference. That is simplifying things somewhat, but should give an idea. keith On Tue, Jan 26, 2010 at 11:53 AM, mos mo...@fastmail.fm wrote: Get yourself a copy of the book High Performance MySQL 2nd Edition Publisher: O'Reilly Media; 2 edition (June 18, 2008) Language: English ISBN-10: 0596101716 ISBN-13: 978-0596101718 Here is a brief preview of the first edition: http://books.google.ca/books?id=iaCCQ13_zMICprintsec=frontcoverdq=high+performance+mysqlcd=1#v=onepageq=f=false Mike At 10:19 AM 1/26/2010, John G. Heim wrote: From: Jaime Crespo Rincón jcre...@warp.es Sent: Monday, January 25, 2010 5:30 PM 2010/1/25 John G. Heim jh...@math.wisc.edu: I have a server with 16Gb of RAM and a dual-core 2Ghz processor. It is running the latest mysql-server from debian lenny (5.0.1). I have databases for drupal, moodle, spamassassin, horde3, and a small database for departmental stuff. The problem is that inserts/updates are sometimes very slow, on the order of a minute. I am hoping somebody can sspot something wrong in my config. Here's the optimization settings section (for your convenience). The whole my.cnf is reproduced below that: Are your databases using MyISAM or InnoDB? Both. Maybe that's the problem? I started creating database tables for my own web apps with the default mysql configuration. I believe the default database engine is MyISAM. But then I wanted to use foreign keys and I saw that it required me to use InnoDB. So I converted some tables to InnoDB but not all. Maybe it was a mistake not to convert all of them. After that, I installed drupal, moodle, and mediawiki. I haven't looked at what kind of tables those packages create. They may not specify it and the default is still whatever it is when you install mysql, MyISAM I think. * If MyISAM, you could be suffering contention problems on writes because of full table locks. No easy solution but engine change or database sharding. Also key_buffer, (and the other buffers) coud be too small for 16GB of RAM. Are you really using more thant 10% of it? You could also disable other engines if unused. * If InnoDB, you have not set innodb_buffer_pool_size nor log size. You could increase the pool to 50% of ram available. Those are very general suggestions. It depends a lot on your hardware (slow storage?), other apps installed on the same machine or the load of the server, among others. Well, it could be that the disks aren't real fast. The server is also running a print server (lprng). I don't think that's very CPU intensive but it might be slowing down writes. -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql?unsub=mo...@fastmail.fm -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe: http://lists.mysql.com/mysql?unsub=bmur...@paragon-cs.com -- Chief Training Officer Paragon Consulting Services 850-637-3877 -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql?unsub=arch...@jab.org
optimization
I have a server with 16Gb of RAM and a dual-core 2Ghz processor. It is running the latest mysql-server from debian lenny (5.0.1). I have databases for drupal, moodle, spamassassin, horde3, and a small database for departmental stuff. The problem is that inserts/updates are sometimes very slow, on the order of a minute. I am hoping somebody can sspot something wrong in my config. Here's the optimization settings section (for your convenience). The whole my.cnf is reproduced below that: key_buffer = 256M max_allowed_packet = 16M max_connections=2000 myisam_sort_buffer_size = 64M open_files_limit = 8192 query_cache_min_res_unit= 2K query_cache_size= 36M read_buffer_size = 1M read_rnd_buffer_size = 4M sort_buffer_size = 1M table_cache = 512 thread_cache = 32 thread_cache_size = 8 thread_concurrency = 8 --- # Example MySQL config file for large systems. # # This is for a large system with memory = 512M where the system runs mainly # MySQL. # # You can copy this file to # /etc/my.cnf to set global options, # mysql-data-dir/my.cnf to set server-specific options (in this # installation this directory is /var/lib/mysql) or # ~/.my.cnf to set user-specific options. # # In this file, you can use all long options that a program supports. # If you want to know which options a program supports, run the program # with the --help option. # The following options will be passed to all MySQL clients [client] #password = your_password port = 3306 socket = /var/run/mysqld/mysqld.sock # Here follows entries for some specific programs # The MySQL server [mysqld] log_slow_queries = /var/log/mysql/mysql-slow.log long_query_time = 2 #log-queries-not-using-indexes port = 3306 socket = /var/run/mysqld/mysqld.sock skip-locking #wait_timeout=14400 key_buffer = 256M max_allowed_packet = 16M max_connections=2000 myisam_sort_buffer_size = 64M open_files_limit = 8192 query_cache_min_res_unit= 2K query_cache_size= 36M read_buffer_size = 1M read_rnd_buffer_size = 4M sort_buffer_size = 1M table_cache = 512 thread_cache = 32 thread_cache_size = 8 thread_concurrency = 8 # Don't listen on a TCP/IP port at all. This can be a security enhancement, # if all processes that need to connect to mysqld run on the same host. # All interaction with mysqld must be made via Unix sockets or named pipes. # Note that using this option without enabling named pipes on Windows # (via the enable-named-pipe option) will render mysqld useless! # #skip-networking # Replication Master Server (default) # binary logging is required for replication log-bin=mysql-bin expire_logs_days= 10 max_binlog_size = 100M # required unique id between 1 and 2^32 - 1 # defaults to 1 if master-host is not set # but will not function as a master if omitted server-id = 1 # Replication Slave (comment out master section to use this) # # To configure this host as a replication slave, you can choose between # two methods : # # 1) Use the CHANGE MASTER TO command (fully described in our manual) - #the syntax is: # #CHANGE MASTER TO MASTER_HOST=host, MASTER_PORT=port, #MASTER_USER=user, MASTER_PASSWORD=password ; # #where you replace host, user, password by quoted strings and #port by the master's port number (3306 by default). # #Example: # #CHANGE MASTER TO MASTER_HOST='125.564.12.1', MASTER_PORT=3306, #MASTER_USER='joe', MASTER_PASSWORD='secret'; # # OR # # 2) Set the variables below. However, in case you choose this method, then #start replication for the first time (even unsuccessfully, for example #if you mistyped the password in master-password and the slave fails to #connect), the slave will create a master.info file, and any later #change in this file to the variables' values below will be ignored and #overridden by the content of the master.info file, unless you shutdown #the slave server, delete master.info and restart the slaver server. #For that reason, you may want to leave the lines below untouched #(commented) and instead use CHANGE MASTER TO (see above) # # required unique id between 2 and 2^32 - 1 # (and different from the master) # defaults to 2 if master-host is set # but will not function as a slave if omitted #server-id = 2 # # The replication master for this slave - required #master-host = hostname # # The username the slave will use for authentication when connecting # to the master - required #master-user = username # # The password the slave will authenticate with when connecting to # the master - required #master-password = password # # The port the master is listening on. # optional - defaults to 3306 #master-port = port # # binary logging - not required for slaves, but recommended #log-bin=mysql-bin # Point the following paths to different dedicated disks #tmpdir = /tmp/ #log-update = /path-to-dedicated-directory/hostname # Uncomment the following if you are using BDB tables #bdb_cache_size = 64M #bdb_max_lock = 10 # Uncomment the
Re: best mysql optimization tutorial and/or quick start guide?
- Original Message - From: Darryle Steplight dstepli...@gmail.com To: Stephen Edberg sbedb...@ucdavis.edu Cc: John G. Heim jh...@math.wisc.edu; mysql@lists.mysql.com Sent: Thursday, March 05, 2009 12:53 PM Subject: Re: best mysql optimization tutorial and/or quick start guide? High Performance MySql Optimization, Backups, Replication, and more 2nd Edition . Got a problem, pick a chapter and read the solution. This book is awesome, I'm confident you will find what you are looking for :) . Excellent tip. It's exactly what I'm looking for. Well, I guess I wouldn't exactly call it a quick start guide. But by chance, it happened to be on bookshare.org. This is a web site which, if you're blind, you can subscribe to to download e-books. I'm already subscribed so I didn't have to pay any additional price for this particular book. Must be my lucky day. -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql?unsub=arch...@jab.org
best mysql optimization tutorial and/or quick start guide?
I've been poking around google looking for tutorials and/or quick start guides on optimizing the mysql server. We just upgraded our DB server from 2 Gb of RAM to 16. But I don't know how to reconfigure mysql to take full advantage of it. Although, just installing the RAM seems to have made a huge difference. Any suggestions for a really good tutorial on configuring the server based on the amount of RAM, etc? -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql?unsub=arch...@jab.org
confused about logging
My web server is running drupal. Yesterday it started giving error messages instead of displaying the hom page. The error says, The MySQL error was: Host 'web1.math.wisc.edu' is blocked because of many connection errors; unblock with 'mysqladmin flush-hosts'. I want to find out why that happened. I'm running the mysql debian package for etch (stable). It installs mysql 5.0. The default my.cnf says this: # Be aware that this log type is a performance killer. #log = /var/log/mysql/mysql.log # Error logging goes to syslog. This is a Debian improvement :) Two questions: 1. Is it a performance killer? 2. There was nothing in the system log. The only messages about mysql were from restarting the server. -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/[EMAIL PROTECTED]
