我有一个MySQL 5.5数据库，有58个表，~14488,772行，大小为19.9 GB。我想提一下，19.5 GB的那些是在一个表中。
我从未更改配置，但在最近的性能问题之后，我偶然发现了每个人似乎首先提到的变量：innodb_buffer_pool_size。在我看到的任何地方，我看到它的值设置为多GB，然后我检查了我自己的，它是（默认值）128 MB。
我在another thread中找到了一个旨在计算正确的缓冲池大小的查询。我运行了这个查询，它告诉我在我的情况下32 GB将是正确的数量。另一方面，该线程调用20 GB的enourmous。我在服务器上有16 GB RAM，这是否意味着我需要32+才能使数据库最佳运行？
这让我担心我正在运行一个配置错误的数据库。有人可以告诉我在数据库配置中通常需要更改的内容吗？需要“摆弄”才能做到正确的设置，我永远不应该触摸的东西？
这是我在phpmyadmin的整个“服务器变量”页面：
Variable Session value / Global value
auto increment increment 1
auto increment offset 1
autocommit ON
automatic sp privileges ON
back log 50
basedir /usr
big tables OFF
binlog cache size 32,768
binlog direct non transactional updates OFF
binlog format STATEMENT
binlog stmt cache size 32,768
bulk insert buffer size 8,388,608
character set client utf8
(Global value) latin1
character set connection utf8
(Global value) latin1
character set database latin1
character set filesystem binary
character set results utf8
(Global value) latin1
character set server latin1
character set system utf8
character sets dir /usr/share/mysql/charsets/
collation connection utf8_general_ci
(Global value) latin1_swedish_ci
collation database latin1_swedish_ci
collation server latin1_swedish_ci
completion type NO_CHAIN
concurrent insert AUTO
connect timeout 10
datadir /var/lib/mysql/
date format %Y-%m-%d
datetime format %Y-%m-%d %H:%i:%s
default storage engine InnoDB
default week format 0
delay key write ON
delayed insert limit 100
delayed insert timeout 300
delayed queue size 1,000
div precision increment 4
engine condition pushdown ON
error count 0
(Global value) 0
event scheduler OFF
expire logs days 10
external user
(Global value)
flush OFF
flush time 0
foreign key checks ON
ft boolean syntax + -><()~*:""&|
ft max word len 84
ft min word len 4
ft query expansion limit 20
ft stopword file (built-in)
general log OFF
general log file /var/lib/mysql/xxx.log
group concat max len 1,024
have compress YES
have crypt YES
have csv YES
have dynamic loading YES
have geometry YES
have innodb YES
have ndbcluster NO
have openssl DISABLED
have partitioning YES
have profiling YES
have query cache YES
have rtree keys YES
have ssl DISABLED
have symlink YES
hostname xxx
identity 0
(Global value) 0
ignore builtin innodb OFF
init connect
init file
init slave
innodb adaptive flushing ON
innodb adaptive hash index ON
innodb additional mem pool size 8,388,608
innodb autoextend increment 8
innodb autoinc lock mode 1
innodb buffer pool instances 1
innodb buffer pool size 134,217,728
innodb change buffering all
innodb checksums ON
innodb commit concurrency 0
innodb concurrency tickets 500
innodb data file path ibdata1:10M:autoextend
innodb data home dir
innodb doublewrite ON
innodb fast shutdown 1
innodb file format Antelope
innodb file format check ON
innodb file format max Antelope
innodb file per table OFF
innodb flush log at trx commit 1
innodb flush method
innodb force load corrupted OFF
innodb force recovery 0
innodb io capacity 200
innodb large prefix OFF
innodb lock wait timeout 50
innodb locks unsafe for binlog OFF
innodb log buffer size 8,388,608
innodb log file size 5,242,880
innodb log files in group 2
innodb log group home dir ./
innodb max dirty pages pct 75
innodb max purge lag 0
innodb mirrored log groups 1
innodb old blocks pct 37
innodb old blocks time 0
innodb open files 300
innodb print all deadlocks OFF
innodb purge batch size 20
innodb purge threads 0
innodb random read ahead OFF
innodb read ahead threshold 56
innodb read io threads 4
innodb replication delay 0
innodb rollback on timeout OFF
innodb rollback segments 128
innodb spin wait delay 6
innodb stats method nulls_equal
innodb stats on metadata ON
innodb stats sample pages 8
innodb strict mode OFF
innodb support xa ON
innodb sync spin loops 30
innodb table locks ON
innodb thread concurrency 0
innodb thread sleep delay 10,000
innodb use native aio OFF
innodb use sys malloc ON
innodb version 5.5.31
innodb write io threads 4
insert id 0
(Global value) 0
interactive timeout 28,800
join buffer size 131,072
keep files on create OFF
key buffer size 16,777,216
key cache age threshold 300
key cache block size 1,024
key cache division limit 100
large files support ON
large page size 0
large pages OFF
last insert id 0
(Global value) 0
lc messages en_US
lc messages dir /usr/share/mysql/
lc time names en_US
license GPL
local infile ON
lock wait timeout 31,536,000
locked in memory OFF
log OFF
log bin OFF
log bin trust function creators OFF
log error
log output FILE
log queries not using indexes OFF
log slave updates OFF
log slow queries OFF
log warnings 1
long query time 10
low priority updates OFF
lower case file system OFF
lower case table names 0
max allowed packet 16,777,216
max binlog cache size 18446744073709547520
max binlog size 104,857,600
max binlog stmt cache size 18446744073709547520
max connect errors 10
max connections 151
max delayed threads 20
max error count 64
max heap table size 16,777,216
max insert delayed threads 20
max join size 18446744073709551615
max length for sort data 1,024
max long data size 16,777,216
max prepared stmt count 16,382
max relay log size 0
max seeks for key 18446744073709551615
max sort length 1,024
max sp recursion depth 0
max tmp tables 32
max user connections 0
max write lock count 18446744073709551615
metadata locks cache size 1,024
min examined row limit 0
multi range count 256
myisam data pointer size 6
myisam max sort file size 9223372036853727232
myisam mmap size 18446744073709551615
myisam recover options BACKUP
myisam repair threads 1
myisam sort buffer size 8,388,608
myisam stats method nulls_unequal
myisam use mmap OFF
net buffer length 16,384
net read timeout 30
net retry count 10
net write timeout 60
new OFF
old OFF
old alter table OFF
old passwords OFF
open files limit 1,024
optimizer prune level 1
optimizer search depth 62
optimizer switch index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,engine_condition_pushdown=on
performance schema OFF
performance schema events waits history long size 10,000
performance schema events waits history size 10
performance schema max cond classes 80
performance schema max cond instances 1,000
performance schema max file classes 50
performance schema max file handles 32,768
performance schema max file instances 10,000
performance schema max mutex classes 200
performance schema max mutex instances 1,000,000
performance schema max rwlock classes 30
performance schema max rwlock instances 1,000,000
performance schema max table handles 100,000
performance schema max table instances 50,000
performance schema max thread classes 50
performance schema max thread instances 1,000
pid file /var/run/mysqld/mysqld.pid
plugin dir /usr/lib/mysql/plugin/
port 3,306
preload buffer size 32,768
profiling OFF
profiling history size 15
protocol version 10
proxy user
(Global value)
pseudo slave mode OFF
(Global value)
pseudo thread id 49,037
(Global value) 0
query alloc block size 8,192
query cache limit 1,048,576
query cache min res unit 4,096
query cache size 16,777,216
query cache type ON
query cache wlock invalidate OFF
query prealloc size 8,192
rand seed1 0
(Global value) 0
rand seed2 0
(Global value) 0
range alloc block size 4,096
read buffer size 131,072
read only OFF
read rnd buffer size 262,144
relay log
relay log index
relay log info file relay-log.info
relay log purge ON
relay log recovery OFF
relay log space limit 0
report host
report password
report port 3,306
report user
rpl recovery rank 0
secure auth OFF
secure file priv
server id 0
skip external locking ON
skip name resolve OFF
skip networking OFF
skip show database OFF
slave compressed protocol OFF
slave exec mode STRICT
slave load tmpdir /tmp
slave max allowed packet 1,073,741,824
slave net timeout 3,600
slave skip errors OFF
slave transaction retries 10
slave type conversions
slow launch time 2
slow query log OFF
slow query log file /var/lib/mysql/bl07-slow.log
socket /var/run/mysqld/mysqld.sock
sort buffer size 2,097,152
sql auto is null OFF
sql big selects ON
sql big tables OFF
sql buffer result OFF
sql log bin ON
sql log off OFF
sql low priority updates OFF
sql max join size 18446744073709551615
sql mode
sql notes ON
sql quote show create ON
sql safe updates OFF
sql select limit 18446744073709551615
sql slave skip counter 0
sql warnings OFF
ssl ca
ssl capath
ssl cert
ssl cipher
ssl key
storage engine InnoDB
stored program cache 256
sync binlog 0
sync frm ON
sync master info 0
sync relay log 0
sync relay log info 0
system time zone CEST
table definition cache 400
table open cache 400
thread cache size 8
thread concurrency 10
thread handling one-thread-per-connection
thread stack 196,608
time format %H:%i:%s
time zone SYSTEM
timed mutexes OFF
timestamp 1,399,897,257
(Global value) 0
tmp table size 16,777,216
tmpdir /tmp
transaction alloc block size 8,192
transaction prealloc size 4,096
tx isolation REPEATABLE-READ
unique checks ON
updatable views with limit YES
version 5.5.31-0ubuntu0.12.04.1
version comment (Ubuntu)
version compile machine x86_64
version compile os debian-linux-gnu
wait timeout 28,800
warning count 0
(Global value) 0
答案 0 :(得分：1)
首先使用innodb_buffer_pool_size的60％可用内存更改配置。可用我的意思是你可以为数据库投入多少RAM。当然，如果你的服务器只运行MySQL，那么60％的物理RAM（我可以将其设置为10G以便启动）。您执行的程序只计算数据库大小（数据和索引）并使您成为32G建议。 为了不让你的记忆溢出，请使用以下网站： http://www.mysqlcalculator.com/