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server optimisation request


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Not a graphics request, but is a request i am willing to pay for.

I am basically having a similar to problem to what Neowin is having with server forum loads and such.

I was an admin of a website running on a server: 2Ghz Core 2, 2GB ram, 2x64GB HDDs, 100MBPS line.

It ran perfectly fine, really fast.

A couple of months a go i actually bought the website from the owner and bought a new server.

The new server specs: 2.6Ghz Phenom (3xcores) - 2GB Ram - 320GB HDD, 100BBPS line.

I noticed that the forum was sluggish, browsing pages was slow, inserting posts was taking up to 15 seconds and was sometimes inserting posts twice.

I have spent countless hours with the host trying to speed it up, which it has done a little, pages now load fast, but in my opinion the forum is still slow when doing certain tasks.

I have also upgraded the server. it now has a 2.0Ghz Phenom X 4 cores and 3GB of ram.. much higher specification than the original server but it still is sluggish.

At this point i asked a server admin to take a look who changed some of the settings on the server, again, it just wont speed up.

So now i am looking for some server optimisation guy, or someone who knows what they are doing to take a look. I know it's going to be some setting burried in MySQL, PHP.ini or my.cnf.

Please PM me with a price, alternatively i can offer my design/web services in return.

The site uses around 350GB b/w per month and has over 100 users online at any time. It has the delay regardless of who is online, even when the forum was closed i could notice delay.

thanks.

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Couple of questions:

Are the delays reproducible easily - does the delay for posting happen every time?

Does the forum (or the other slow pages) have a "time to generate page" stat on them - is it roughly the same time taken as the page took to load in the browser?

Obvious one but what's the load like on the server when the delays are happening?

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Are the delays reproducible easily - does the delay for posting happen every time?

The delay is pretty much there all the time.

Does the forum (or the other slow pages) have a "time to generate page" stat on them - is it roughly the same time taken as the page took to load in the browser?

The delay happens like this (example):

- User clicks a page

---- Browser says waiting - server seems to hang for 4 seconds, usually more if posting.

- Page changes and loads instantly after the initial server hang - there is no delay with the page actually loading its content which leads me to believe it's a query or the database what's hanging.

Obvious one but what's the load like on the server when the delays are happening?

MySQL Process - CPU % 126 MEM % 12.9

CPU Usage: u.17 s.07 cu36.3 cs0 - .00303%

CPU load 5.71 requests/sec - 50.6 kB/second - 8.9 kB/request

20 requests currently being processed, 4 idle workers

Server Load 1.18 (4 cpus)

Memory Used 19.1 %

mysql - (cpu)126.28 (mem)12.92 - based on 1 CPU daily averages.

These stats are up to date and right now there are 117 users online.

I also forgot to mention it's a VBulletin forum.

Edited by forcer
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no one? :cry:

Our devs are currently busy working on neowins own load problems. From what they have said thou, it was both a catching problem and search engine bots getting the infomation too frequently or something along those lines.

One thing I can definately tell you thou putting this in Grafix Exchange will not get the notice of the techno boffins... You might want to ask a mod to place it in the 'Web Server Side' forum instead.

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Thanks, i'll do that.

I've been reading this post: https://www.neowin.net/news/google-binged-us-in-the-yahoo-so-hard-we-had-to-ask-jeeves33#comments

Which got me thinking i could be having a similar issue. When i moved and upgraded my forum i had to remove an SEO rewrite script that stopped working, effectively changing all the links back to the original forumview.?php?f=838383 from /seo/urls/

Could this also have sent the spiders going crazy?

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One thing I can definately tell you thou putting this in Grafix Exchange will not get the notice of the techno boffins... You might want to ask a mod to place it in the 'Web Server Side' forum instead.

Done.

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Yes CPANEL / WHM

Just the one forum installed, i am hosting a couple of more domains, however they get little to no traffic at all and the problems were still here before i hosted any extra domains.

Browsing all website pages works fast. it's just certain forum pages:

showthread.php

forumdisplay.php

newreply.php

can take up to 5 seconds to load. (stats from firebug extension in firefox)

I have just inserted a post, this is what it done:

POST newreply.php - Status: 302 Moved Temporarily (whatever that means?) - 2.47 seconds

GET showthread.php - Status: 200 OK - 4.41 seconds

so 6.88 seconds to insert a post.

click back to index.php = 718ms

I dont know if i mentioned it in my first post but the database is over 1GB is size, it has 1.5 million posts

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What Apache/PHP configuration did you setup for the server? A poor config can lead to some problems.

You can try a few things pending what version of Apache you're using (you'll need root ssh access):

Runa benchmark first so you can compare the before & after of your changes.

ab -c 5 -n 20 example.com/benchmark.php

nano /usr/local/apache/conf/httpd.conf

I would suggest you make an httpd.confbak file in case you want to revert to the original conf file.

MaxClients - This is for the total number of concurrent connections. Usually I do a little math equation.. 150*RAM. So if you've got 3GB of ram, then you should change this value to 450. Set it too low and create timeout issues if it's reached or too high can cause issues with a DDoS and cause the server to hang. Which is why I just stick to the math problem instead of a random value.

MaxClients = 450

MinSpareServers & MaxSpareServers - Both of these control unused Apache child-processes. Each of these consumes resources but since you've got 3GB and run a resource intensive site, you can up MaxSpareServers up a little. You can use the following (default is 5, 10):

MinSpareServers 10
MaxSpareServers 20

MaxRequestsPerChild - This setting controls the number of requests that a child servers before it's killed. I would suggest using:

MaxRequestsPerChild 1000

After your changes run

service httpd restart
/usr/local/cpanel/bin/apache_conf_distiller ?update
/usr/local/cpanel/bin/build_apache_conf

A few other things you can run:

Update/Patch OS

yum update

up2date -p
up2date -u

aptitude update
aptitude upgrade

/scripts/upcp

You might also want to optimize MySQL settings as well.

Here is an example my.cnf file from my client's server with just 2048MB RAM. You will obviously have a little more leeway to work with since you have 3GB of RAM to work with. I would recommend you make sure you know what each settings is for before changing them.

Make a backup of your my.cnf before editing the /etc/my.cnf.

[mysqld]
max_connections = 800
key_buffer = 36M
myisam_sort_buffer_size = 64M
join_buffer_size = 2M
read_buffer_size = 2M
sort_buffer_size = 3M
table_cache = 1024
thread_cache_size = 286
interactive_timeout = 25
wait_timeout = 1800
connect_timeout = 10
max_allowed_packet = 16M
max_connect_errors = 10
query_cache_limit = 1M
query_cache_size = 16M
query_cache_type = 1
tmp_table_size = 16M
skip-innodb

[mysqld_safe]
open_files_limit = 8192

[mysqldump]
quick
max_allowed_packet = 16M

[myisamchk]
key_buffer = 64M
sort_buffer = 64M
read_buffer = 16M
write_buffer = 16M

OR you can run MySQL Tuner and follows its suggestions :) Although I have seen some people say that it's a hit & a miss once in awhile where it might devalue your settings versus increasing (even if it should be increased due to hardware that can handle it.)

 
 cd 
 wget http://day32.com/MySQL/tuning-primer.sh
 chmod 755 tuning-primer.sh 
 ./tuning-primer.sh

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Im running Apache v2.0.63

and can edit httpd.conf from the WHM manager, is it ok to do it this way?

can you tell me how to back up said files, i've tried finding it on google but failed.

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I can i just noticed it in WHM as well and wondered.

here is the results from mysqltuner, being honest i'm not too experienced so i'm not understanding this much. If you are able to tell me any specific values that need changing.


 >>  MySQLTuner 1.0.1 - Major Hayden <major@mhtx.net>
 >>  Bug reports, feature requests, and downloads at http://mysqltuner.com/
 >>  Run with '--help' for additional options and output filtering

-------- General Statistics --------------------------------------------------
[--] Skipped version check for MySQLTuner script
[OK] Currently running supported MySQL version 5.0.87-community-log
[!!] Switch to 64-bit OS - MySQL cannot currently use all of your RAM

-------- Storage Engine Statistics -------------------------------------------
[--] Status: +Archive -BDB -Federated -InnoDB -ISAM -NDBCluster 
[--] Data in MyISAM tables: 862M (Tables: 315)
[--] Data in MEMORY tables: 126K (Tables: 1)
[!!] Total fragmented tables: 32

-------- Performance Metrics -------------------------------------------------
[--] Up for: 20d 5h 46m 10s (29M q [17.114 qps], 1M conn, TX: 2B, RX: 2B)
[--] Reads / Writes: 68% / 32%
[--] Total buffers: 652.0M global + 10.6M per thread (220 max threads)
[!!] Allocating > 2GB RAM on 32-bit systems can cause system instability
[!!] Maximum possible memory usage: 2.9G (98% of installed RAM)
[OK] Slow queries: 0% (1K/29M)
[OK] Highest usage of available connections: 23% (52/220)
[OK] Key buffer size / total MyISAM indexes: 256.0M/136.6M
[OK] Key buffer hit rate: 100.0% (804M cached / 84K reads)
[OK] Query cache efficiency: 65.9% (14M cached / 21M selects)
[!!] Query cache prunes per day: 2554
[OK] Sorts requiring temporary tables: 0% (4K temp sorts / 2M sorts)
[!!] Temporary tables created on disk: 33% (244K on disk / 727K total)
[OK] Thread cache hit rate: 99% (52 created / 1M connections)
[!!] Table cache hit rate: 10% (982 open / 9K opened)
[OK] Open file limit used: 2% (1K/65K)
[OK] Table locks acquired immediately: 98% (20M immediate / 20M locks)

-------- Recommendations -----------------------------------------------------
General recommendations:
    Run OPTIMIZE TABLE to defragment tables for better performance
    Enable the slow query log to troubleshoot bad queries
    Increasing the query_cache size over 128M may reduce 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:
  *** MySQL's maximum memory usage is dangerously high ***
  *** Add RAM before increasing MySQL buffer variables ***
    long_query_time (<= 10)
    query_cache_size (> 256M) [see warning above]
    tmp_table_size (> 130M)
    max_heap_table_size (> 130M)
    table_cache (> 32652)

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Exactly which Phenom is it? the earlier ones suffering the TLB errata had performance drops of over 50% in some applications with the TLB patch enabled for stability.

Also is xcache installed?

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when i try to change MaxClients = 450 it resets itself back to 150 and from WHM it says the max is 250

and when i run distiller -update it says:

No actions specified. Valid actions are:

.......

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ServerLimit 512
StartServers 32
MinSpareServers 5
MaxSpareServers 20
MaxClients 512
MaxRequestsPerChild 1000

Try that and see if it keeps resetting.

Also, some of the other commands I gave you don't *have* to run, it's just updating some of the core files for CentOS and cPanel/WHM just to make sure.

Also what version are you using for cPanel/WHM?

In WHM

 Main >> Server Configuration >> Update Preferences

Change to "Automatic (RELEASE tree)", Automatic, Automatic and save.

Then you can run

 /scripts/upcp

I run cPanel 11.25.0-R42404 - WHM 11.25.0 - X 3.9 on all of my servers right now.

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Server Limit is already on 2048 - should i lower it?

I'm running the same version of cpanel/whm, its set to update automatically.

Exactly which Phenom is it? the earlier ones suffering the TLB errata had performance drops of over 50% in some applications with the TLB patch enabled for stability.

Also is xcache installed?

xcache? no i dont think so.

its the phenom x4 2.0 ghz

Edited by forcer
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The issue with it resetting was that I don't think I included ServerLimit to be increased. If it's not increased, then you can't increase MaxClients as to why you say it reset itself.

With my new snippet since SeverLimit is set to 512, you can set MaxClients to 512. Just figured I'd mention that since I didn't realize my mistake :).

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The issue with it resetting was that I don't think I included ServerLimit to be increased. If it's not increased, then you can't increase MaxClients as to why you say it reset itself.

With my new snippet since SeverLimit is set to 512, you can set MaxClients to 512. Just figured I'd mention that since I didn't realize my mistake :).

ServerLimit appears to be on 2048, so this should of let me increase MaxClients

here is my.cnf.. can you make any recommendations based on the mysqltuner and the cnf you posted.

thanks for your help :)

[client]
port = 3306
socket = /var/lib/mysql/mysql.sock

[mysqld]
port = 3306
socket = /var/lib/mysql/mysql.sock
log = /var/log/mysqld.log

set-variable = max_connections=220
safe-show-database
#query_cache_size=100M
query_cache_size=256M
join_buffer_size=8M
thread_cache_size=8M
table_cache=64M
key_buffer_size=256M
tmp_table_size=130M
max_heap_table_size=130M
expire_logs_days=4
skip-innodb
skip-name-resolve
thread_concurrency=8
long_query_time=10

long_query_time = 15
log-long-format
#log-slow-queries=/var/log/slow-queries.log

[mysqld_safe]
open_files_limit = 8192

[mysqldump]
quick
max_allowed_packet = 16M

[mysqlhotcopy]
interactive-timeout

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Can you login to SSH, then MySQL, and post the output of a query?

show global status;

Also, this query will produce a set of optimize table queries for all the non system tables on the server... I would try running this query, then running the queries it produces during an off-peak time:

select concat('optimize table ', TABLE_SCHEMA, '.', TABLE_NAME, ';') as qq from INFORMATION_SCHEMA.TABLES where TABLE_SCHEMA NOT IN ('mysql','INFORMATION_SCHEMA');

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Can you login to SSH, then MySQL, and post the output of a query?

show global status;

Also, this query will produce a set of optimize table queries for all the non system tables on the server... I would try running this query, then running the queries it produces during an off-peak time:

select concat('optimize table ', TABLE_SCHEMA, '.', TABLE_NAME, ';') as qq from INFORMATION_SCHEMA.TABLES where TABLE_SCHEMA NOT IN ('mysql','INFORMATION_SCHEMA');

i'll do that, thanks, here are the results from show global status;


mysql> show global status;
+-----------------------------------+------------+
| Variable_name                     | Value      |
+-----------------------------------+------------+
| Aborted_clients                   | 0          | 
| Aborted_connects                  | 788        | 
| Binlog_cache_disk_use             | 0          | 
| Binlog_cache_use                  | 0          | 
| Bytes_received                    | 231796567  | 
| Bytes_sent                        | 1012594274 | 
| Com_admin_commands                | 64         | 
| Com_alter_db                      | 0          | 
| Com_alter_table                   | 0          | 
| Com_analyze                       | 0          | 
| Com_backup_table                  | 0          | 
| Com_begin                         | 0          | 
| Com_call_procedure                | 0          | 
| Com_change_db                     | 57348      | 
| Com_change_master                 | 0          | 
| Com_check                         | 0          | 
| Com_checksum                      | 0          | 
| Com_commit                        | 0          | 
| Com_create_db                     | 0          | 
| Com_create_function               | 0          | 
| Com_create_index                  | 0          | 
| Com_create_table                  | 17         | 
| Com_create_user                   | 0          | 
| Com_dealloc_sql                   | 0          | 
| Com_delete                        | 3434       | 
| Com_delete_multi                  | 0          | 
| Com_do                            | 0          | 
| Com_drop_db                       | 0          | 
| Com_drop_function                 | 0          | 
| Com_drop_index                    | 0          | 
| Com_drop_table                    | 17         | 
| Com_drop_user                     | 0          | 
| Com_execute_sql                   | 0          | 
| Com_flush                         | 1          | 
| Com_grant                         | 0          | 
| Com_ha_close                      | 0          | 
| Com_ha_open                       | 0          | 
| Com_ha_read                       | 0          | 
| Com_help                          | 0          | 
| Com_insert                        | 24507      | 
| Com_insert_select                 | 455        | 
| Com_kill                          | 0          | 
| Com_load                          | 0          | 
| Com_load_master_data              | 0          | 
| Com_load_master_table             | 0          | 
| Com_lock_tables                   | 143        | 
| Com_optimize                      | 0          | 
| Com_preload_keys                  | 0          | 
| Com_prepare_sql                   | 0          | 
| Com_purge                         | 0          | 
| Com_purge_before_date             | 0          | 
| Com_rename_table                  | 0          | 
| Com_repair                        | 0          | 
| Com_replace                       | 3301       | 
| Com_replace_select                | 0          | 
| Com_reset                         | 0          | 
| Com_restore_table                 | 0          | 
| Com_revoke                        | 0          | 
| Com_revoke_all                    | 0          | 
| Com_rollback                      | 0          | 
| Com_savepoint                     | 0          | 
| Com_select                        | 244443     | 
| Com_set_option                    | 53657      | 
| Com_show_binlog_events            | 0          | 
| Com_show_binlogs                  | 0          | 
| Com_show_charsets                 | 0          | 
| Com_show_collations               | 0          | 
| Com_show_column_types             | 0          | 
| Com_show_create_db                | 0          | 
| Com_show_create_table             | 0          | 
| Com_show_databases                | 4          | 
| Com_show_errors                   | 0          | 
| Com_show_fields                   | 93         | 
| Com_show_grants                   | 0          | 
| Com_show_innodb_status            | 0          | 
| Com_show_keys                     | 4          | 
| Com_show_logs                     | 0          | 
| Com_show_master_status            | 0          | 
| Com_show_ndb_status               | 0          | 
| Com_show_new_master               | 0          | 
| Com_show_open_tables              | 0          | 
| Com_show_privileges               | 0          | 
| Com_show_processlist              | 198        | 
| Com_show_slave_hosts              | 0          | 
| Com_show_slave_status             | 0          | 
| Com_show_status                   | 1          | 
| Com_show_storage_engines          | 0          | 
| Com_show_tables                   | 0          | 
| Com_show_triggers                 | 0          | 
| Com_show_variables                | 5          | 
| Com_show_warnings                 | 0          | 
| Com_slave_start                   | 0          | 
| Com_slave_stop                    | 0          | 
| Com_stmt_close                    | 0          | 
| Com_stmt_execute                  | 0          | 
| Com_stmt_fetch                    | 0          | 
| Com_stmt_prepare                  | 0          | 
| Com_stmt_reset                    | 0          | 
| Com_stmt_send_long_data           | 0          | 
| Com_truncate                      | 118        | 
| Com_unlock_tables                 | 143        | 
| Com_update                        | 70615      | 
| Com_update_multi                  | 57         | 
| Com_xa_commit                     | 0          | 
| Com_xa_end                        | 0          | 
| Com_xa_prepare                    | 0          | 
| Com_xa_recover                    | 0          | 
| Com_xa_rollback                   | 0          | 
| Com_xa_start                      | 0          | 
| Compression                       | OFF        | 
| Connections                       | 56846      | 
| Created_tmp_disk_tables           | 4957       | 
| Created_tmp_files                 | 248        | 
| Created_tmp_tables                | 12886      | 
| Delayed_errors                    | 0          | 
| Delayed_insert_threads            | 0          | 
| Delayed_writes                    | 0          | 
| Flush_commands                    | 1          | 
| Handler_commit                    | 0          | 
| Handler_delete                    | 7528       | 
| Handler_discover                  | 0          | 
| Handler_prepare                   | 0          | 
| Handler_read_first                | 45663      | 
| Handler_read_key                  | 4049855    | 
| Handler_read_next                 | 84956557   | 
| Handler_read_prev                 | 2143292    | 
| Handler_read_rnd                  | 526209     | 
| Handler_read_rnd_next             | 3132598617 | 
| Handler_rollback                  | 0          | 
| Handler_savepoint                 | 0          | 
| Handler_savepoint_rollback        | 0          | 
| Handler_update                    | 113331     | 
| Handler_write                     | 166703     | 
| Innodb_buffer_pool_pages_data     | 0          | 
| Innodb_buffer_pool_pages_dirty    | 0          | 
| Innodb_buffer_pool_pages_flushed  | 0          | 
| Innodb_buffer_pool_pages_free     | 0          | 
| Innodb_buffer_pool_pages_misc     | 0          | 
| Innodb_buffer_pool_pages_total    | 0          | 
| Innodb_buffer_pool_read_ahead_rnd | 0          | 
| Innodb_buffer_pool_read_ahead_seq | 0          | 
| Innodb_buffer_pool_read_requests  | 0          | 
| Innodb_buffer_pool_reads          | 0          | 
| Innodb_buffer_pool_wait_free      | 0          | 
| Innodb_buffer_pool_write_requests | 0          | 
| Innodb_data_fsyncs                | 0          | 
| Innodb_data_pending_fsyncs        | 0          | 
| Innodb_data_pending_reads         | 0          | 
| Innodb_data_pending_writes        | 0          | 
| Innodb_data_read                  | 0          | 
| Innodb_data_reads                 | 0          | 
| Innodb_data_writes                | 0          | 
| Innodb_data_written               | 0          | 
| Innodb_dblwr_pages_written        | 0          | 
| Innodb_dblwr_writes               | 0          | 
| Innodb_log_waits                  | 0          | 
| Innodb_log_write_requests         | 0          | 
| Innodb_log_writes                 | 0          | 
| Innodb_os_log_fsyncs              | 0          | 
| Innodb_os_log_pending_fsyncs      | 0          | 
| Innodb_os_log_pending_writes      | 0          | 
| Innodb_os_log_written             | 0          | 
| Innodb_page_size                  | 0          | 
| Innodb_pages_created              | 0          | 
| Innodb_pages_read                 | 0          | 
| Innodb_pages_written              | 0          | 
| Innodb_row_lock_current_waits     | 0          | 
| Innodb_row_lock_time              | 0          | 
| Innodb_row_lock_time_avg          | 0          | 
| Innodb_row_lock_time_max          | 0          | 
| Innodb_row_lock_waits             | 0          | 
| Innodb_rows_deleted               | 0          | 
| Innodb_rows_inserted              | 0          | 
| Innodb_rows_read                  | 0          | 
| Innodb_rows_updated               | 0          | 
| Key_blocks_not_flushed            | 0          | 
| Key_blocks_unused                 | 196793     | 
| Key_blocks_used                   | 35167      | 
| Key_read_requests                 | 23992443   | 
| Key_reads                         | 34833      | 
| Key_write_requests                | 77081      | 
| Key_writes                        | 48556      | 
| Last_query_cost                   | 0.000000   | 
| Max_used_connections              | 19         | 
| Not_flushed_delayed_rows          | 0          | 
| Open_files                        | 791        | 
| Open_streams                      | 0          | 
| Open_tables                       | 460        | 
| Opened_tables                     | 748        | 
| Prepared_stmt_count               | 0          | 
| Qcache_free_blocks                | 1845       | 
| Qcache_free_memory                | 248833592  | 
| Qcache_hits                       | 471069     | 
| Qcache_inserts                    | 237164     | 
| Qcache_lowmem_prunes              | 0          | 
| Qcache_not_cached                 | 7353       | 
| Qcache_queries_in_cache           | 5588       | 
| Qcache_total_blocks               | 13474      | 
| Queries                           | 985694     | 
| Questions                         | 985694     | 
| Rpl_status                        | NULL       | 
| Select_full_join                  | 1          | 
| Select_full_range_join            | 0          | 
| Select_range                      | 43937      | 
| Select_range_check                | 0          | 
| Select_scan                       | 97149      | 
| Slave_open_temp_tables            | 0          | 
| Slave_retried_transactions        | 0          | 
| Slave_running                     | OFF        | 
| Slow_launch_threads               | 0          | 
| Slow_queries                      | 14         | 
| Sort_merge_passes                 | 124        | 
| Sort_range                        | 29799      | 
| Sort_rows                         | 3675193    | 
| Sort_scan                         | 38358      | 
| Table_locks_immediate             | 665177     | 
| Table_locks_waited                | 9975       | 
| Tc_log_max_pages_used             | 0          | 
| Tc_log_page_size                  | 0          | 
| Tc_log_page_waits                 | 0          | 
| Threads_cached                    | 18         | 
| Threads_connected                 | 1          | 
| Threads_created                   | 19         | 
| Threads_running                   | 1          | 
| Uptime                            | 58991      | 
+-----------------------------------+------------+
225 rows in set (0.00 sec)

mysql> 

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