Re: remote mysql is too slow
On Wed, Apr 11, 2012 at 09:23:09PM +0100, Bob Proulx wrote: > Karl E. Jorgensen wrote: > > Bob Proulx wrote: > > > But at some point the daemon is going to need to write a file to disk. > > > That data will get cached at that time. Or are you saying that mysql > > > is using or should using O_DIRECT and avoid the cache explicitly? > > > > No - although that might help (marginally) too. The point is that > > caching of data in MySQL will be more efficient than caching in the > > kernel disk cache; less layers and whatnot. > > The point I was trying to make (and apparently failing miserably) is > that unless the mysql daemon is really trying hard to avoid it then as > soon as it writes a file it will end up in the filesystem buffer > cache. ah. The miserable failing was at the receiving end - sorry :-) > In any case, from the original 'free' output it isn't possible to know > if the filesystem buffer cache is due to mysql or due to other > activity across the filesystem. Such as backup for example. It could > have come from any other activity. There could be files being copied > to or from the system. Could be anything. Agreed > Normally filesystem buffer cache is a good healthy indication. > Because if the operating system becomes starved for memory it will > free filesystem buffer cache in order to obtain it. If a system has > no files cached and lots of truly free ram it may indicate that some > process is frequently consuming a lot of memory, forcing all buffers > to be flushed, and then exiting causing that memory to be free memory. > Free memory as opposed to working-for-you memory in the buffer cache. > Normally I would say memory used for filesystem buffer cache is good > healthy use of the memory. And when I say normally here I am not > talking about a database daemon which will of course have special > needs. Definitely special needs. -- Karl E. Jorgensen IT Operations -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/20120413144316.GG11957@hawking
Re: remote mysql is too slow
Karl E. Jorgensen wrote: > Bob Proulx wrote: > > But at some point the daemon is going to need to write a file to disk. > > That data will get cached at that time. Or are you saying that mysql > > is using or should using O_DIRECT and avoid the cache explicitly? > > No - although that might help (marginally) too. The point is that > caching of data in MySQL will be more efficient than caching in the > kernel disk cache; less layers and whatnot. The point I was trying to make (and apparently failing miserably) is that unless the mysql daemon is really trying hard to avoid it then as soon as it writes a file it will end up in the filesystem buffer cache. In any case, from the original 'free' output it isn't possible to know if the filesystem buffer cache is due to mysql or due to other activity across the filesystem. Such as backup for example. It could have come from any other activity. There could be files being copied to or from the system. Could be anything. Normally filesystem buffer cache is a good healthy indication. Because if the operating system becomes starved for memory it will free filesystem buffer cache in order to obtain it. If a system has no files cached and lots of truly free ram it may indicate that some process is frequently consuming a lot of memory, forcing all buffers to be flushed, and then exiting causing that memory to be free memory. Free memory as opposed to working-for-you memory in the buffer cache. Normally I would say memory used for filesystem buffer cache is good healthy use of the memory. And when I say normally here I am not talking about a database daemon which will of course have special needs. Bob signature.asc Description: Digital signature
Re: remote mysql is too slow
On Wed, Apr 11, 2012 at 07:18:18AM +0100, Bob Proulx wrote: > Karl E. Jorgensen wrote: > > Jumping back in (late) in this thread... > > Bob Proulx wrote: > > > > # free -m > > > > total used free sharedbuffers > > > > cached > > > > Mem: 7986 7913 73 0224 > > > > 6133 > > > > -/+ buffers/cache: 1554 6431 > > > > Swap: 3813 0 3813 > > > > > > Shows 8G of ram. Good. Shows no swap used. Also good. (But not > > > necessarily bad if some swap is used. So if you see some swap being > > > used that isn't necessarily a problem.) > > > > Mostly good. Yes. But 6133 Mb Cached is not what I would expect - this > > indicates that the linux kernel is doing the caching - rather than > > MySQL. And the MySQL cache for this stuff is (almost) always more > > efficient. > > But at some point the daemon is going to need to write a file to disk. > That data will get cached at that time. Or are you saying that mysql > is using or should using O_DIRECT and avoid the cache explicitly? No - although that might help (marginally) too. The point is that caching of data in MySQL will be more efficient than caching in the kernel disk cache; less layers and whatnot. -- Karl E. Jorgensen IT Operations -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/20120411145523.GE30103@hawking
Re: remote mysql is too slow
Karl E. Jorgensen wrote: > Jumping back in (late) in this thread... > Bob Proulx wrote: > > > # free -m > > > total used free sharedbuffers cached > > > Mem: 7986 7913 73 0224 6133 > > > -/+ buffers/cache: 1554 6431 > > > Swap: 3813 0 3813 > > > > Shows 8G of ram. Good. Shows no swap used. Also good. (But not > > necessarily bad if some swap is used. So if you see some swap being > > used that isn't necessarily a problem.) > > Mostly good. Yes. But 6133 Mb Cached is not what I would expect - this > indicates that the linux kernel is doing the caching - rather than > MySQL. And the MySQL cache for this stuff is (almost) always more > efficient. But at some point the daemon is going to need to write a file to disk. That data will get cached at that time. Or are you saying that mysql is using or should using O_DIRECT and avoid the cache explicitly? Bob signature.asc Description: Digital signature
Re: remote mysql is too slow
On Tue, 10 Apr 2012 12:24:47 +0100 "Karl E. Jorgensen" wrote: > > > > > > # free -m > > > total used free sharedbuffers cached > > > Mem: 7986 7913 73 0224 6133 > > > -/+ buffers/cache: 1554 6431 > > > Swap: 3813 0 3813 > > > > Shows 8G of ram. Good. Shows no swap used. Also good. (But not > > necessarily bad if some swap is used. So if you see some swap being > > used that isn't necessarily a problem.) > > > Mostly good. Yes. But 6133 Mb Cached is not what I would expect - this > indicates that the linux kernel is doing the caching - rather than > MySQL. And the MySQL cache for this stuff is (almost) always more > efficient. > > If you use InnoDB tables, you can increase innodb_buffer_pool to e.g. > 4Gb more. > I did, but them mysqltuner warned me that the max memory usage is dangerously high and I need to install more physical memory. So I reduce it to 2G. > If are using MyISAM tables, increase key_buffer_size (affects caching of > indexes) and probably others - I don't use MyISAM tables much... > Yes, I have MyISAM tables. And provided 250M to key_buffer_size. -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/20120411103641.192bd...@shiva.selfip.org
Re: remote mysql is too slow
Jumping back in (late) in this thread... On Mon, 2012-04-09 at 19:51 +0100, Bob Proulx wrote: > J. Bakshi wrote: > > Karl E. Jorgensen wrote: > > > J. Bakshi wrote: > > > > I have been provided a muscular linux server to use as a Mysql server > > > > in our organization. The server is located just beside the web server > > > > and within the same network. This dedicated server has 8GB RAM, i5 > > > > processors > > > > and running mysql as service. No apache, php . nothing. All > > > > resources are > > > > dedicated to mysql only. > > That does sound big and muscular and should do a good job of providing > database services. > > > > > The BIG hitch is; when we connect with this box the web sites become > > > > too slow. > > Unfortunately subjective descriptions such as "too slow" are not > useful descriptions. One person's very fast is another person's too > slow. Objective benchmark data is needed in order to make forward > progress. Also when you change something to improve the performance > if you don't know how much you changed things you might actually make > something worse without knowing it. > > The other suggestions that people gave you were good. They were > better than anything I could suggest about mysql specifically. But > for performance tuning in general I strongly recommend that you use or > create a benchmark that illustrates the type of operation you are > trying to optimize. Benchmarks are best when they can be shared with > other people so that they can recreate your environment. It might be > useful to create a benchmark using synthetic data (created fake data) > so that others can share your environment and recreate it. > > Then collect data on that benchmark. Then make performance tuning > changes. Then run the benchmarkmark again and determine if your > change improved things and if so by how much. > > > > > The sql connection becomes little faster but still it is considerably > > > > slow; specially with such a muscular dedicated linx box just for Mysql. > > > > Is there anything else which I can add/configure to make the network > > > > latecy > > > > small or any such mechanism to make the query fast ? > > Please show us data that tells us how slow is slow and how fast is > fast. > > I am not a mysql performance expert. I won't be able to help too > much. Sorry. But I can tell you that if you don't have actual data > on the existing performance then you also won't know if you have > improved it or if you have made it worse or if you haven't changed > anything. Benchmarking when performance tuning is critically > important. > > > # free -m > > total used free sharedbuffers cached > > Mem: 7986 7913 73 0224 6133 > > -/+ buffers/cache: 1554 6431 > > Swap: 3813 0 3813 > > Shows 8G of ram. Good. Shows no swap used. Also good. (But not > necessarily bad if some swap is used. So if you see some swap being > used that isn't necessarily a problem.) Mostly good. Yes. But 6133 Mb Cached is not what I would expect - this indicates that the linux kernel is doing the caching - rather than MySQL. And the MySQL cache for this stuff is (almost) always more efficient. If you use InnoDB tables, you can increase innodb_buffer_pool to e.g. 4Gb more. If are using MyISAM tables, increase key_buffer_size (affects caching of indexes) and probably others - I don't use MyISAM tables much... > > > # vmstat 5 10 > > procs ---memory-- ---swap-- -io -system-- > > cpu > > r b swpd free buff cache si sobibo in cs us sy id > > wa > > 0 0 0 56328 230440 629967600257466 0 0 98 > > 2 > > 0 0 0 55700 230440 629974400 022 226 272 0 0 99 > > 1 > > 0 0 0 55964 230440 629985600 0 314 348 388 0 0 94 > > 5 > > 0 0 0 55452 230440 629995600 061 304 364 0 0 97 > > 2 > > 0 1 0 55592 230440 630042400 0 271 199 257 0 0 96 > > 4 > > 0 0 0 54584 230440 630090800 0 338 342 428 0 0 92 > > 8 > > 0 0 0 54800 230440 630107200 077 119 133 0 0 98 > > 2 > > 0 0 0 53964 230440 630153200 0 617 267 327 0 0 95 > > 4 > > 0 0 0 54468 230440 630154400 0 296 119 116 0 0 99 > > 0 > > 0 0 0 54212 230440 630164800 0 183 361 435 0 0 95 > > 4 > > The 'si' and 'so' fields show zero swap-in / swap-out rate. That is > good. A very low rate of 1 or 2 also would not be a problem. When > machines start to swap excessively you will see rate numbers like 10 > or 20 in that field and that would be a bad indication. > > Bob
Re: remote mysql is too slow
J. Bakshi wrote: > Karl E. Jorgensen wrote: > > J. Bakshi wrote: > > > I have been provided a muscular linux server to use as a Mysql server > > > in our organization. The server is located just beside the web server > > > and within the same network. This dedicated server has 8GB RAM, i5 > > > processors > > > and running mysql as service. No apache, php . nothing. All resources > > > are > > > dedicated to mysql only. That does sound big and muscular and should do a good job of providing database services. > > > The BIG hitch is; when we connect with this box the web sites become too > > > slow. Unfortunately subjective descriptions such as "too slow" are not useful descriptions. One person's very fast is another person's too slow. Objective benchmark data is needed in order to make forward progress. Also when you change something to improve the performance if you don't know how much you changed things you might actually make something worse without knowing it. The other suggestions that people gave you were good. They were better than anything I could suggest about mysql specifically. But for performance tuning in general I strongly recommend that you use or create a benchmark that illustrates the type of operation you are trying to optimize. Benchmarks are best when they can be shared with other people so that they can recreate your environment. It might be useful to create a benchmark using synthetic data (created fake data) so that others can share your environment and recreate it. Then collect data on that benchmark. Then make performance tuning changes. Then run the benchmarkmark again and determine if your change improved things and if so by how much. > > > The sql connection becomes little faster but still it is considerably > > > slow; specially with such a muscular dedicated linx box just for Mysql. > > > Is there anything else which I can add/configure to make the network > > > latecy > > > small or any such mechanism to make the query fast ? Please show us data that tells us how slow is slow and how fast is fast. I am not a mysql performance expert. I won't be able to help too much. Sorry. But I can tell you that if you don't have actual data on the existing performance then you also won't know if you have improved it or if you have made it worse or if you haven't changed anything. Benchmarking when performance tuning is critically important. > # free -m > total used free sharedbuffers cached > Mem: 7986 7913 73 0224 6133 > -/+ buffers/cache: 1554 6431 > Swap: 3813 0 3813 Shows 8G of ram. Good. Shows no swap used. Also good. (But not necessarily bad if some swap is used. So if you see some swap being used that isn't necessarily a problem.) > # vmstat 5 10 > procs ---memory-- ---swap-- -io -system-- cpu > r b swpd free buff cache si sobibo in cs us sy id wa > 0 0 0 56328 230440 629967600257466 0 0 98 2 > 0 0 0 55700 230440 629974400 022 226 272 0 0 99 1 > 0 0 0 55964 230440 629985600 0 314 348 388 0 0 94 5 > 0 0 0 55452 230440 629995600 061 304 364 0 0 97 2 > 0 1 0 55592 230440 630042400 0 271 199 257 0 0 96 4 > 0 0 0 54584 230440 630090800 0 338 342 428 0 0 92 8 > 0 0 0 54800 230440 630107200 077 119 133 0 0 98 2 > 0 0 0 53964 230440 630153200 0 617 267 327 0 0 95 4 > 0 0 0 54468 230440 630154400 0 296 119 116 0 0 99 0 > 0 0 0 54212 230440 630164800 0 183 361 435 0 0 95 4 The 'si' and 'so' fields show zero swap-in / swap-out rate. That is good. A very low rate of 1 or 2 also would not be a problem. When machines start to swap excessively you will see rate numbers like 10 or 20 in that field and that would be a bad indication. Bob signature.asc Description: Digital signature
Re: remote mysql is too slow
On Mon, 9 Apr 2012 12:36:30 +0530 "J. Bakshi" wrote: > ` > > Is it possible to suggest something to tweak the server / mysql to get > a fast remote mysql box ? > Almost certainly, but it's more likely that people who use mysql very intensively will be better able to help you than general Debian users. Have you considered seeking help in mysql forums? The vast majority of heavy mysql users will be running it on Linux or a BSD, and there's not really anything Debian-specific about mysql. -- Joe -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/20120409093142.63369...@jretrading.com
Re: remote mysql is too slow
On Thu, 05 Apr 2012 11:36:38 +0100 "Karl E. Jorgensen" wrote: > Hi > > On Thu, 2012-04-05 at 08:13 +0100, J. Bakshi wrote: > > > Hello, > > > > I have been provided a muscular linux server to use as a Mysql server > > in our organization. The server is located just beside the web server > > and within the same network. This dedicated server has 8GB RAM, i5 > > processors > > and running mysql as service. No apache, php . nothing. All resources > > are > > dedicated to mysql only. > > > > Mysql version - mysql Ver 14.14 Distrib 5.1.49, for debian-linux-gnu > > (x86_64) > > > > The BIG hitch is; when we connect with this box the web sites become too > > slow. > > I have added the following at my.cnf under [mysqld] section > > > > ` ` ` ` ` > > skip_external_locking > > skip_name_resolve > > skip_host_cach > > > > ` ` ` ` ` ` > > > > > > The sql connection becomes little faster but still it is considerably > > slow; specially with such a muscular dedicated linx box just for Mysql. > > Is there anything else which I can add/configure to make the network latecy > > small or any such mechanism to make the query fast ? > > > Although you say "all resources are dedicated to mysql only", I guess > they're not. > > First step: run mysqltuner - this will give some rough recommendations > which will usually point people in the right direction. Beware that > mysqltuner will always recommend setting innodb_buffer_pool_size big > enough to keep all InnoDB tables in memory - which is usually overkill. > I run the mysqltuner directly on the remote mysql server; and here is the result ``` General Statistics -- [--] Skipped version check for MySQLTuner script [OK] Currently running supported MySQL version 5.1.49-3-log [OK] Operating on 64-bit architecture Storage Engine Statistics --- [--] Status: -Archive -BDB -Federated +InnoDB -ISAM -NDBCluster [--] Data in MyISAM tables: 1G (Tables: 4777) [--] Data in InnoDB tables: 3G (Tables: 5543) [--] Data in MEMORY tables: 0B (Tables: 136) [!!] Total fragmented tables: 5562 Performance Metrics - [--] Up for: 3d 23h 55m 27s (1M q [4.523 qps], 81K conn, TX: 23B, RX: 469M) [--] Reads / Writes: 74% / 26% [--] Total buffers: 2.2G global + 20.4M per thread (150 max threads) [OK] Maximum possible memory usage: 5.2G (66% of installed RAM) [OK] Slow queries: 2% (39K/1M) [OK] Highest usage of available connections: 18% (28/150) [OK] Key buffer size / total MyISAM indexes: 2.0G/268.5M [!!] Key buffer hit rate: 78.2% (5M cached / 1M reads) [OK] Query cache efficiency: 42.0% (327K cached / 778K selects) [!!] Query cache prunes per day: 1993 [OK] Sorts requiring temporary tables: 0% (48 temp sorts / 9K sorts) [!!] Temporary tables created on disk: 39% (91K on disk / 230K total) [OK] Thread cache hit rate: 99% (28 created / 81K connections) [!!] Table cache hit rate: 6% (16K open / 248K opened) [OK] Open file limit used: 36% (11K/32K) [OK] Table locks acquired immediately: 99% (695K immediate / 695K locks) [!!] InnoDB data size / buffer pool: 3.6G/8.0M Recommendations - General recommendations: Run OPTIMIZE TABLE to defragment tables for better performance When making adjustments, make tmp_table_size/max_heap_table_size equal Reduce your SELECT DISTINCT queries without LIMIT clauses Increase table_cache gradually to avoid file descriptor limits Variables to adjust: query_cache_size (> 128M) tmp_table_size (> 100M) max_heap_table_size (> 100M) table_cache (> 16000) innodb_buffer_pool_size (>= 3G) Please note, every day mysql optimization as well as repairing is done by a cron at night. I have also tried with the suggestion multiple times before but every time it gives some new suggestion. I have 8GB physical RAM in this server and here is some statistics ` # free -m total used free sharedbuffers cached Mem: 7986 7913 73 0224 6133 -/+ buffers/cache: 1554 6431 Swap: 3813 0 3813 ` And here is the vmstat result with 10 count and 5 sec delay ` # vmstat 5 10 procs ---memory-- ---swap-- -io -system-- cpu r b swpd free buff cache si sobibo in cs us sy id wa 0 0 0 56328 230440 629967600257466 0 0 98 2 0 0 0 55700 230440 629974400 022 226 272 0 0 99 1 0 0 0 55964 230440 629985600 0 314 348 388 0 0 94 5 0 0 0 55452 230440 629995600 061 304 364 0 0 97 2 0 1 0 5
Re: remote mysql is too slow
2012/4/5 J. Bakshi :
> I have been provided a muscular linux server to use as a Mysql server
> in our organization. [...]
> The BIG hitch is; when we connect with this box the web sites become
> too slow.
Is this in direct comparison to some other database or server, or is it
more of a black and white ("it's too slow") statement?
If it's slower than some other database system you're going to need to
look at your network topology and system configuration and compare like
for like as best you can.
If it's a simple statement of fact you probably need to look at
your application architecture. Are you - and should you be - using
memcached? Have you got indexes on the right table columns? Are you
using ISAM when you should be using InnoDB (or v.v.)?
Juan Sierra Pons wrote:
> * Do you have anything in your mysql's slow query log?
This is a good place to check, but it doesn't preclude you checking that
all your frequent database queries and updates are using indexes.
Chris
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Re: remote mysql is too slow
Hi On Thu, 2012-04-05 at 08:13 +0100, J. Bakshi wrote: > Hello, > > I have been provided a muscular linux server to use as a Mysql server > in our organization. The server is located just beside the web server > and within the same network. This dedicated server has 8GB RAM, i5 processors > and running mysql as service. No apache, php . nothing. All resources are > dedicated to mysql only. > > Mysql version - mysql Ver 14.14 Distrib 5.1.49, for debian-linux-gnu (x86_64) > > The BIG hitch is; when we connect with this box the web sites become too slow. > I have added the following at my.cnf under [mysqld] section > > ` ` ` ` ` > skip_external_locking > skip_name_resolve > skip_host_cach > > ` ` ` ` ` ` > > > The sql connection becomes little faster but still it is considerably > slow; specially with such a muscular dedicated linx box just for Mysql. > Is there anything else which I can add/configure to make the network latecy > small or any such mechanism to make the query fast ? Although you say "all resources are dedicated to mysql only", I guess they're not. First step: run mysqltuner - this will give some rough recommendations which will usually point people in the right direction. Beware that mysqltuner will always recommend setting innodb_buffer_pool_size big enough to keep all InnoDB tables in memory - which is usually overkill. if "vmstat" reports that CPU usage is low, and disk IO is low, this points towards locking contention - which is entirely application dependent. Hope you haven't used MyISAM tables when you intended to use InnoDB tables :-) if "vmstat" reports high cpu usage, and low disk IO, then the database is probably in memory, and you need to look at one or more of: * queries scanning lots of rows (e.g. missing indexes) * for InnoDB tables: if innodb_buffer_pool is too small, but the server has "lots" of memory, the linux kernel will cache disk blocks rather than MySQL doing it. Which translates to high CPU load and lots of cache hits. But in this case it is more efficient to let MySQL do the caching rather than the kernel. > > The server has very little load as observer from top and iostat > even during peak hours. > > Thanks > > <>
Re: remote mysql is too slow
2012/4/5 J. Bakshi : > Hello, > > I have been provided a muscular linux server to use as a Mysql server > in our organization. The server is located just beside the web server > and within the same network. This dedicated server has 8GB RAM, i5 processors > and running mysql as service. No apache, php . nothing. All resources are > dedicated to mysql only. > > Mysql version - mysql Ver 14.14 Distrib 5.1.49, for debian-linux-gnu (x86_64) > > The BIG hitch is; when we connect with this box the web sites become too slow. > I have added the following at my.cnf under [mysqld] section > > ` ` ` ` ` > skip_external_locking > skip_name_resolve > skip_host_cach > > ` ` ` ` ` ` > > > The sql connection becomes little faster but still it is considerably > slow; specially with such a muscular dedicated linx box just for Mysql. > Is there anything else which I can add/configure to make the network latecy > small or any such mechanism to make the query fast ? > > The server has very little load as observer from top and iostat > even during peak hours. > > Thanks > > > -- > To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org > with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org > Archive: http://lists.debian.org/20120405124336.73d6c...@shiva.selfip.org > Hi My 5 cents: :) * Do you have anything in your mysql's slow query log? entries look like (see below) and can point you in the right direction. As maybe is a SQL bad programming problem, lock between tables, etc . # Wed Apr 4 13:08:27 2012 # Query_time: 1.494178 Lock_time: 0.00 Rows_sent: 0 Rows_examined: 0 use elsotani_X; SET timestamp=1333566507; CREATE TABLE IF NOT EXISTS `wp_translate_langs` ( `id` int(11) NOT NULL AUTO_INCREMENT, `name` varchar(25) NOT NULL, `main` tinyint(1) NOT NULL default 0, `order` tinyint(1) NOT NULL default 0, `icon` varchar(20) NOT NULL default '', PRIMARY KEY (`id`) ) * Is your DNS server responding quickly? Just a quick check. add the IPs & server names to /etc/hosts in mysql server and clients and see if performance is better. I have seen that you have "skip_name_resolve" and "skip_host_cache" parameters set, but this solves (workaround) only the servers' side not the clients * Anything wrong in your apache's logs? Keep us informed about your progresses. I hope it helps :) Best regards -- Juan Sierra Pons j...@elsotanillo.net Linux User Registered: #257202 http://www.elsotanillo.net GPG key = 0xA110F4FE Key Fingerprint = DF53 7415 0936 244E 9B00 6E66 E934 3406 A110 F4FE -- -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/CABS=y9uPRH_6V3W8EGjhEymWh3zP07e5Mwxn=izsceac0bk...@mail.gmail.com
remote mysql is too slow
Hello, I have been provided a muscular linux server to use as a Mysql server in our organization. The server is located just beside the web server and within the same network. This dedicated server has 8GB RAM, i5 processors and running mysql as service. No apache, php . nothing. All resources are dedicated to mysql only. Mysql version - mysql Ver 14.14 Distrib 5.1.49, for debian-linux-gnu (x86_64) The BIG hitch is; when we connect with this box the web sites become too slow. I have added the following at my.cnf under [mysqld] section ` ` ` ` ` skip_external_locking skip_name_resolve skip_host_cach ` ` ` ` ` ` The sql connection becomes little faster but still it is considerably slow; specially with such a muscular dedicated linx box just for Mysql. Is there anything else which I can add/configure to make the network latecy small or any such mechanism to make the query fast ? The server has very little load as observer from top and iostat even during peak hours. Thanks -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/20120405124336.73d6c...@shiva.selfip.org
