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mysql怎么用內(nèi)存庫 可以用mysql做庫存管理嗎

mysql 如何分配內(nèi)存

我們?nèi)匀皇褂脙蓚€會話,一個會話 run,用于運行主 SQL;另一個會話 ps,用于進(jìn)行 performance_schema 的觀察:

為文縣等地區(qū)用戶提供了全套網(wǎng)頁設(shè)計制作服務(wù),及文縣網(wǎng)站建設(shè)行業(yè)解決方案。主營業(yè)務(wù)為成都網(wǎng)站建設(shè)、做網(wǎng)站、文縣網(wǎng)站設(shè)計,以傳統(tǒng)方式定制建設(shè)網(wǎng)站,并提供域名空間備案等一條龍服務(wù),秉承以專業(yè)、用心的態(tài)度為用戶提供真誠的服務(wù)。我們深信只要達(dá)到每一位用戶的要求,就會得到認(rèn)可,從而選擇與我們長期合作。這樣,我們也可以走得更遠(yuǎn)!

主會話線程號為 29,

將 performance_schema 中的統(tǒng)計量重置,

臨時表的表大小限制取決于參數(shù)? tmp_table_size 和 max_heap_table_size 中較小者,我們實驗中以設(shè)置 max_heap_table_size 為例。

我們將會話級別的臨時表大小設(shè)置為 2M(小于上次實驗中臨時表使用的空間),執(zhí)行使用臨時表的 SQL:

查看內(nèi)存的分配記錄:

會發(fā)現(xiàn)內(nèi)存分配略大于 2M,我們猜測臨時表會比配置略多一點消耗,可以忽略。

查看語句的特征值:

可以看到語句使用了一次需要落磁盤的臨時表。

那么這張臨時表用了多少的磁盤呢?

我們開啟 performance_schema 中 waits 相關(guān)的統(tǒng)計項:

重做實驗,略過。

再查看 performance_schema 的統(tǒng)計值:

可以看到幾個現(xiàn)象:

1. 臨時表空間被寫入了 7.92MiB 的數(shù)據(jù)。

2. 這些數(shù)據(jù)是語句寫入后,慢慢逐漸寫入的。

來看看這些寫入操作的特征,該方法我們在?實驗 03?使用過:

可以看到寫入的線程是 page_clean_thread,是一個刷臟操作,這樣就能理解數(shù)據(jù)為什么是慢慢寫入的。

也可以看到每個 IO 操作的大小是 16K,也就是刷數(shù)據(jù)頁的操作。

結(jié)論:

我們可以看到,

1. MySQL 會基本遵守 max_heap_table_size 的設(shè)定,在內(nèi)存不夠用時,直接將表轉(zhuǎn)到磁盤上存儲。

2. 由于引擎不同(內(nèi)存中表引擎為 heap,磁盤中表引擎則跟隨 internal_tmp_disk_storage_engine 的配置),本次實驗寫磁盤的數(shù)據(jù)量和?實驗 05?中使用內(nèi)存的數(shù)據(jù)量不同。

3. 如果臨時表要使用磁盤,表引擎配置為 InnoDB,那么即使臨時表在一個時間很短的 SQL 中使用,且使用后即釋放,釋放后也會刷臟頁到磁盤中,消耗部分 IO。

如何實現(xiàn)mysql 內(nèi)存數(shù)據(jù)庫

有一個表引擎叫內(nèi)存表,你在新建時可以選擇,或已有的表可以修改過去

MySQL內(nèi)存使用以及優(yōu)化中需要的幾點注意

1、從內(nèi)存中讀取數(shù)據(jù)是微秒級別的。而從磁盤讀則是毫秒級別的。二者相差一個數(shù)量級。所以想優(yōu)化數(shù)據(jù)庫,第一個要做到的就是優(yōu)化io。

2、key_buffer_size[global]設(shè)置的內(nèi)存區(qū)域大小緩存了myisam表的索引。由于myisam只緩存索引在內(nèi)存中,并不緩存數(shù)據(jù)在內(nèi)存,所以如果內(nèi)存允許,要讓這個參數(shù)足夠能容納所有myisam的所有索引來提高性能。另外,在myisam表上,盡量讓所有的查詢條件都限制在索引上,以便能讓緩存替我們提高查找效率。

3、bulk_insert_buffer_size[thread]僅僅用在myisam中,用于在插入數(shù)據(jù)的時候臨時緩存數(shù)據(jù)。當(dāng)我們使用如下的寫入語句的時候,會使用這個內(nèi)存區(qū)域幫助批量寫入數(shù)據(jù)文件:

insert ... select ...

insert into ... values ...

MySQL 內(nèi)存占用總是太高,你需要立即進(jìn)行這些操作……

生產(chǎn)環(huán)境中,MySQL 不經(jīng)意間吃掉全部的內(nèi)容,然后開始吃掉 SWAP,性能一降再降,怎么辦?

可以從下面三點查看原因:

MySQL 使用內(nèi)存,有兩個途徑。

永久占用的內(nèi)容

比如全局緩沖區(qū)(Global Buffer)類別,是在服務(wù)器啟動期間從操作系統(tǒng)獲得的,不會釋放到任何一個別的進(jìn)程。

動態(tài)請求的內(nèi)存

線程緩沖區(qū)由MySQL使用,它是在處理新查詢時從操作系統(tǒng)請求的內(nèi)存。在執(zhí)行查詢之后,該內(nèi)存被釋放回操作系統(tǒng)。

這意味著 MySQL 的內(nèi)存使用,是 全局緩沖區(qū) 加上 線程緩沖區(qū) 以及 允許的最大連接數(shù) 。

對于專用數(shù)據(jù)庫服務(wù)器,該值需要保持在服務(wù)器內(nèi)存的90%以下。在共享服務(wù)器的情況下,它應(yīng)該保持在服務(wù)器內(nèi)存的50%以下。

檢查一下 MySQL 設(shè)置,有助于確定內(nèi)存使用情況,從而為 MySQL 分配合適的值。

一個近似的公式:

當(dāng)網(wǎng)站受到攻擊時,有可能在短時間內(nèi)建立異常高的連接數(shù)量。MySQL 中的 PROCESSLIST 可用于檢測頂級用戶并阻止對濫用連接的訪問。

找出查詢需要很長時間才能執(zhí)行的語句,因為這些查詢需要進(jìn)一步優(yōu)化服務(wù)器才能更好地執(zhí)行,可以通過服務(wù)器查詢?nèi)罩具M(jìn)行識別。由于查詢速度慢,導(dǎo)致磁盤讀取較多,導(dǎo)致內(nèi)存和CPU使用率較高,影響服務(wù)器性能。

最后,到了加內(nèi)存條的時候了。雖然在優(yōu)化數(shù)據(jù)庫設(shè)置之后,服務(wù)器會不斷地路由到使用交換內(nèi)存,但也必須增加內(nèi)存。俗話說:“巧婦難為無米之炊”,就是這個意思。

上面說的這些方向,大家可以在實際操作中驗證體會,希望大家在數(shù)據(jù)庫優(yōu)化的路上,麻溜順暢,砥礪前行。

mysql耗內(nèi)存嗎?應(yīng)該怎么處理?

mysql耗內(nèi)存嗎?很多人都說MySQL占用了很大的虛擬內(nèi)存,那么這個問題應(yīng)該怎么解決呢?下面是我收集整理的一些方法,現(xiàn)在分享給大家!

解決mysql耗內(nèi)存的具體方法一:

在分析的過程中發(fā)現(xiàn)最耗內(nèi)存的是MySQL,其中近1GB的內(nèi)存被它吞了,而且不在任務(wù)管理器體現(xiàn)出來。這個數(shù)據(jù)庫軟件是EMS要用到了,所以必須要運行。這個軟件在安裝的時候會根據(jù)機(jī)器的實際內(nèi)存自動進(jìn)行配置,PC機(jī)物理內(nèi)存越多,它默認(rèn)占有的內(nèi)存就越多,難怪3GB的內(nèi)存被它給吞了近1GB。

優(yōu)化方法:

1. 退出EMS clientserver

2. 在CMD里運行:net stop mysql

3. 找到MySQL\MySQL Server的安裝目錄,里面有個my.ini文件,參考附件的配置對參數(shù)query_cache_size tmp_table_size myisam_sort_buffer_size key_buffer_size innodb_buffer_pool_size進(jìn)行修改,注意不要改動innodb_log_file_size,修改前備份my.ini

4. 在CMD里運行:net start mysql,如果提示成功,則說明修改的參數(shù)沒有什么問題,如果失敗,重新調(diào)整一下上面的參數(shù)

5. 找到EMS 安裝目錄runGUI.bat runServer.bat腳本,找到-Xmx700m,改為-Xmx256m,注意修改前備份這兩個文件,感謝Liping Sun提供幫助

6. 重新運行EMS

前后對比,對于3GB的PC,發(fā)現(xiàn)可以節(jié)省近1GB的內(nèi)存。對于2GB的PC,也可以節(jié)省600-800MB。優(yōu)化后發(fā)現(xiàn)EMS啟動稍微慢一些,但是其它的軟件運行速度提高了很多,不在經(jīng)常出現(xiàn)卡機(jī)現(xiàn)象了。如果在運行過程中發(fā)現(xiàn)EMS特別慢的話,自己也可以適當(dāng)放大上面提到的一些參數(shù)。

my.ini

# MySQL Server Instance Configuration File

# ----------------------------------------------------------------------

# Generated by the MySQL Server Instance Configuration Wizard

#

#

# Installation Instructions

# ----------------------------------------------------------------------

#

# On Linux you can copy this file to /etc/my.cnf to set global options,

# mysql-data-dir/my.cnf to set server-specific options

# (@localstatedir@ for this installation) or to

# ~/.my.cnf to set user-specific options.

#

# On Windows you should keep this file in the installation directory

# of your server (e.g. C:\Program Files\MySQL\MySQL Server X.Y). To

# make sure the server reads the config file use the startup option

# "--defaults-file".

#

# To run run the server from the command line, execute this in a

# command line shell, e.g.

# mysqld --defaults-file="C:\Program Files\MySQL\MySQL Server X.Y\my.ini"

#

# To install the server as a Windows service manually, execute this in a

# command line shell, e.g.

# mysqld --install MySQLXY --defaults-file="C:\Program Files\MySQL\MySQL Server X.Y\my.ini"

#

# And then execute this in a command line shell to start the server, e.g.

# net start MySQLXY

#

#

# Guildlines for editing this file

# ----------------------------------------------------------------------

#

# In this file, you can use all long options that the program supports.

# If you want to know the options a program supports, start the program

# with the "--help" option.

#

# More detailed information about the individual options can also be

# found in the manual.

#

#

# CLIENT SECTION

# ----------------------------------------------------------------------

#

# The following options will be read by MySQL client applications.

# Note that only client applications shipped by MySQL are guaranteed

# to read this section. If you want your own MySQL client program to

# honor these values, you need to specify it as an option during the

# MySQL client library initialization.

#

[client]

port=3306

[mysql]

default-character-set=utf8

# SERVER SECTION

# ----------------------------------------------------------------------

#

# The following options will be read by the MySQL Server. Make sure that

# you have installed the server correctly (see above) so it reads this

# file.

#

[mysqld]

# The TCP/IP Port the MySQL Server will listen on

port=3306

#Path to installation directory. All paths are usually resolved relative to this.

basedir="D:/Program Files/MySQL/MySQL Server 5.1/"

#Path to the database root

datadir="C:/Documents and Settings/All Users/Application Data/MySQL/MySQL Server 5.1/Data/"

# The default character set that will be used when a new schema or table is

# created and no character set is defined

character-set-server=utf8

# The default storage engine that will be used when create new tables when

default-storage-engine=INNODB

# Set the SQL mode to strict

sql-mode="STRICT_TRANS_TABLES,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION"

# The maximum amount of concurrent sessions the MySQL server will

# allow. One of these connections will be reserved for a user with

# SUPER privileges to allow the administrator to login even if the

# connection limit has been reached.

max_connections=1510

# Query cache is used to cache SELECT results and later return them

# without actual executing the same query once again. Having the query

# cache enabled may result in significant speed improvements, if your

# have a lot of identical queries and rarely changing tables. See the

# "Qcache_lowmem_prunes" status variable to check if the current value

# is high enough for your load.

# Note: In case your tables change very often or if your queries are

# textually different every time, the query cache may result in a

# slowdown instead of a performance improvement.

query_cache_size=16M

# The number of open tables for all threads. Increasing this value

# increases the number of file descriptors that mysqld requires.

# Therefore you have to make sure to set the amount of open files

# allowed to at least 4096 in the variable "open-files-limit" in

# section [mysqld_safe]

table_cache=3020

# Maximum size for internal (in-memory) temporary tables. If a table

# grows larger than this value, it is automatically converted to disk

# based table This limitation is for a single table. There can be many

# of them.

tmp_table_size=4M

# How many threads we should keep in a cache for reuse. When a client

# disconnects, the client's threads are put in the cache if there aren't

# more than thread_cache_size threads from before. This greatly reduces

# the amount of thread creations needed if you have a lot of new

# connections. (Normally this doesn't give a notable performance

# improvement if you have a good thread implementation.)

thread_cache_size=64

#*** MyISAM Specific options

# The maximum size of the temporary file MySQL is allowed to use while

# recreating the index (during REPAIR, ALTER TABLE or LOAD DATA INFILE.

# If the file-size would be bigger than this, the index will be created

# through the key cache (which is slower).

myisam_max_sort_file_size=100G

# If the temporary file used for fast index creation would be bigger

# than using the key cache by the amount specified here, then prefer the

# key cache method. This is mainly used to force long character keys in

# large tables to use the slower key cache method to create the index.

myisam_sort_buffer_size=4M

# Size of the Key Buffer, used to cache index blocks for MyISAM tables.

# Do not set it larger than 30% of your available memory, as some memory

# is also required by the OS to cache rows. Even if you're not using

# MyISAM tables, you should still set it to 8-64M as it will also be

# used for internal temporary disk tables.

key_buffer_size=16M

# Size of the buffer used for doing full table scans of MyISAM tables.

# Allocated per thread, if a full scan is needed.

read_buffer_size=64K

read_rnd_buffer_size=256K

# This buffer is allocated when MySQL needs to rebuild the index in

# REPAIR, OPTIMZE, ALTER table statements as well as in LOAD DATA INFILE

# into an empty table. It is allocated per thread so be careful with

# large settings.

sort_buffer_size=256K

#*** INNODB Specific options ***

# Use this option if you have a MySQL server with InnoDB support enabled

# but you do not plan to use it. This will save memory and disk space

# and speed up some things.

#skip-innodb

# Additional memory pool that is used by InnoDB to store metadata

# information. If InnoDB requires more memory for this purpose it will

# start to allocate it from the OS. As this is fast enough on most

# recent operating systems, you normally do not need to change this

# value. SHOW INNODB STATUS will display the current amount used.

innodb_additional_mem_pool_size=9M

# If set to 1, InnoDB will flush (fsync) the transaction logs to the

# disk at each commit, which offers full ACID behavior. If you are

# willing to compromise this safety, and you are running small

# transactions, you may set this to 0 or 2 to reduce disk I/O to the

# logs. Value 0 means that the log is only written to the log file and

# the log file flushed to disk approximately once per second. Value 2

# means the log is written to the log file at each commit, but the log

# file is only flushed to disk approximately once per second.

innodb_flush_log_at_trx_commit=1

# The size of the buffer InnoDB uses for buffering log data. As soon as

# it is full, InnoDB will have to flush it to disk. As it is flushed

# once per second anyway, it does not make sense to have it very large

# (even with long transactions).

innodb_log_buffer_size=5M

# InnoDB, unlike MyISAM, uses a buffer pool to cache both indexes and

# row data. The bigger you set this the less disk I/O is needed to

# access data in tables. On a dedicated database server you may set this

# parameter up to 80% of the machine physical memory size. Do not set it

# too large, though, because competition of the physical memory may

# cause paging in the operating system. Note that on 32bit systems you

# might be limited to 2-3.5G of user level memory per process, so do not

# set it too high.

innodb_buffer_pool_size=32M

# Size of each log file in a log group. You should set the combined size

# of log files to about 25%-100% of your buffer pool size to avoid

# unneeded buffer pool flush activity on log file overwrite. However,

# note that a larger logfile size will increase the time needed for the

# recovery process.

innodb_log_file_size=88M

# Number of threads allowed inside the InnoDB kernel. The optimal value

# depends highly on the application, hardware as well as the OS

# scheduler properties. A too high value may lead to thread thrashing.

innodb_thread_concurrency=8

   解決mysql耗內(nèi)存的具體方法二:

更改后如下:

innodb_buffer_pool_size=576M -256M InnoDB引擎緩沖區(qū)占了大頭,首要就是拿它開刀

query_cache_size=100M -16M 查詢緩存

tmp_table_size=102M -64M 臨時表大小

key_buffer_size=256m -32M

重啟mysql服務(wù)后,虛擬內(nèi)存降到200以下.

另外mysql安裝目錄下有幾個文件:my-huge.ini 、my-large.ini、my-medium.ini...這幾個是根據(jù)內(nèi)存大小作的建議配置,新手在設(shè)置的時候也可以參考一下。

2G內(nèi)存的MYSQL數(shù)據(jù)庫服務(wù)器 my.ini優(yōu)化 (my.ini)

2G內(nèi)存,針對站少,優(yōu)質(zhì)型的設(shè)置,試驗特:

table_cache=1024 物理內(nèi)存越大,設(shè)置就越大.默認(rèn)為2402,調(diào)到512-1024最佳

innodb_additional_mem_pool_size=8M 默認(rèn)為2M

innodb_flush_log_at_trx_commit=0 等到innodb_log_buffer_size列隊滿后再統(tǒng)一儲存,默認(rèn)為1

innodb_log_buffer_size=4M 默認(rèn)為1M

innodb_thread_concurrency=8 你的服務(wù)器CPU有幾個就設(shè)置為幾,默認(rèn)為8

key_buffer_size=256M 默認(rèn)為218 調(diào)到128最佳

tmp_table_size=64M 默認(rèn)為16M 調(diào)到64-256最掛

read_buffer_size=4M 默認(rèn)為64K

read_rnd_buffer_size=16M 默認(rèn)為256K

sort_buffer_size=32M 默認(rèn)為256K

max_connections=1024 默認(rèn)為1210

試驗一:

table_cache=512或1024

innodb_additional_mem_pool_size=2M

innodb_flush_log_at_trx_commit=0

innodb_log_buffer_size=1M

innodb_thread_concurrency=8 你的服務(wù)器CPU有幾個就設(shè)置為幾,默認(rèn)為8

key_buffer_size=128M

tmp_table_size=128M

read_buffer_size=64K或128K

read_rnd_buffer_size=256K

sort_buffer_size=512K

max_connections=1024

試驗二:

table_cache=512或1024

innodb_additional_mem_pool_size=8M

innodb_flush_log_at_trx_commit=0

innodb_log_buffer_size=4M

innodb_thread_concurrency=8

key_buffer_size=128M

tmp_table_size=128M

read_buffer_size=4M

read_rnd_buffer_size=16M

sort_buffer_size=32M

max_connections=1024

一般:

table_cache=512

innodb_additional_mem_pool_size=8M

innodb_flush_log_at_trx_commit=0

innodb_log_buffer_size=4M

innodb_thread_concurrency=8

key_buffer_size=128M

tmp_table_size=128M

read_buffer_size=4M

read_rnd_buffer_size=16M

sort_buffer_size=32M

max_connections=1024

經(jīng)過測試.沒有特殊情況,最好還是用默認(rèn)的.

2G內(nèi)存,針對站多,抗壓型的設(shè)置,最佳:

table_cache=1024 物理內(nèi)存越大,設(shè)置就越大.默認(rèn)為2402,調(diào)到512-1024最佳

innodb_additional_mem_pool_size=4M 默認(rèn)為2M

innodb_flush_log_at_trx_commit=1

(設(shè)置為0就是等到innodb_log_buffer_size列隊滿后再統(tǒng)一儲存,默認(rèn)為1)

innodb_log_buffer_size=2M 默認(rèn)為1M

innodb_thread_concurrency=8 你的服務(wù)器CPU有幾個就設(shè)置為幾,建議用默認(rèn)一般為8

key_buffer_size=256M 默認(rèn)為218 調(diào)到128最佳

tmp_table_size=64M 默認(rèn)為16M 調(diào)到64-256最掛

read_buffer_size=4M 默認(rèn)為64K

read_rnd_buffer_size=16M 默認(rèn)為256K

sort_buffer_size=32M 默認(rèn)為256K

max_connections=1024 默認(rèn)為1210

thread_cache_size=120 默認(rèn)為60

query_cache_size=64M

優(yōu)化mysql數(shù)據(jù)庫性能的十個參數(shù)

(1)、max_connections:

允許的同時客戶的數(shù)量。增加該值增加 mysqld 要求的文件描述符的數(shù)量。這個數(shù)字應(yīng)該增加,否則,你將經(jīng)??吹?too many connections 錯誤。 默認(rèn)數(shù)值是100,我把它改為1024 。

(2)、record_buffer:

每個進(jìn)行一個順序掃描的線程為其掃描的每張表分配這個大小的一個緩沖區(qū)。如果你做很多順序掃描,你可能想要增加該值。默認(rèn)數(shù)值是131072(128k),我把它改為16773120 (16m)

(3)、key_buffer_size:

索引塊是緩沖的并且被所有的線程共享。key_buffer_size是用于索引塊的緩沖區(qū)大小,增加它可得到更好處理的索引(對所有讀和多重寫),到你能負(fù)擔(dān)得起那樣多。如果你使它太大,系統(tǒng)將開始換頁并且真的變慢了。默認(rèn)數(shù)值是8388600(8m),我的mysql主機(jī)有2gb內(nèi)存,所以我把它改為 402649088(400mb)。

4)、back_log:

要求 mysql 能有的連接數(shù)量。當(dāng)主要mysql線程在一個很短時間內(nèi)得到非常多的連接請求,這就起作用,然后主線程花些時間(盡管很短)檢查連接并且啟動一個新線程。

back_log 值指出在mysql暫時停止回答新請求之前的短時間內(nèi)多少個請求可以被存在堆棧中。只有如果期望在一個短時間內(nèi)有很多連接,你需要增加它,換句話說,這值對到來的tcp/ip連接的偵聽隊列的大小。你的操作系統(tǒng)在這個隊列大小上有它自己的限制。試圖設(shè)定back_log高于你的操作系統(tǒng)的限制將是無效的。

當(dāng)你觀察你的主機(jī)進(jìn)程列表,發(fā)現(xiàn)大量 264084 | unauthenticated user | xxx.xxx.xxx.xxx | null | connect | null | login | null 的待連接進(jìn)程時,就要加大 back_log 的值了。默認(rèn)數(shù)值是50,我把它改為500。

(5)、interactive_timeout:

服務(wù)器在關(guān)閉它前在一個交互連接上等待行動的秒數(shù)。一個交互的客戶被定義為對 mysql_real_connect()使用 client_interactive 選項的客戶。 默認(rèn)數(shù)值是28800,我把它改為7200。

(6)、sort_buffer:

每個需要進(jìn)行排序的線程分配該大小的一個緩沖區(qū)。增加這值加速order by或group by操作。默認(rèn)數(shù)值是2097144(2m),我把它改為 16777208 (16m)。

(7)、table_cache:

為所有線程打開表的數(shù)量。增加該值能增加mysqld要求的文件描述符的數(shù)量。mysql對每個唯一打開的表需要2個文件描述符。默認(rèn)數(shù)值是64,我把它改為512。

(8)、thread_cache_size:

可以復(fù)用的保存在中的線程的數(shù)量。如果有,新的線程從緩存中取得,當(dāng)斷開連接的時候如果有空間,客戶的線置在緩存中。如果有很多新的線程,為了提高性能可以這個變量值。通過比較 connections 和 threads_created 狀態(tài)的變量,可以看到這個變量的作用。我把它設(shè)置為 80。

(9)mysql的搜索功能

用mysql進(jìn)行搜索,目的是能不分大小寫,又能用中文進(jìn)行搜索

只需起動mysqld時指定 --default-character-set=gb2312

(10)、wait_timeout:

服務(wù)器在關(guān)閉它之前在一個連接上等待行動的秒數(shù)。 默認(rèn)數(shù)值是28800,我把它改為7200。

注:參數(shù)的調(diào)整可以通過修改 /etc/my.cnf 文件并重啟 mysql 實現(xiàn)。這是一個比較謹(jǐn)慎的工作,上面的結(jié)果也僅僅是我的一些看法,你可以根據(jù)你自己主機(jī)的硬件情況(特別是內(nèi)存大小)進(jìn)一步修改。

分享題目:mysql怎么用內(nèi)存庫 可以用mysql做庫存管理嗎
文章源于:http://jinyejixie.com/article22/hepgcc.html

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