dwdm 100g

file...xxx. To cloud ... ", file) print (' Close connection ... ') def data_backup (folder): print (" Find directory to back up ... ", folder) Print ("Package the backup file, move to the appropriate directory ...") return '/tmp/backup20181103.zip ' Def data_backup_test (): print ("\ n Download the backup file from a remote cloud center from another machine to see if the file is lossless "def main (): zip_file = data_backup (" c:\\users\\alex\ Europe

The platform has a large number of pictures have been used, the order of magnitude of millions, almost 100G of space, whether it is too wasteful? Copy Code code as follows: Db.fs.files.find ({filename:/xxx/}). ForEach (function (n) {db.fs.files.update {filename:u.filename},{$set: { filename:newname}},false,true)}//Regular batch is changed to a fixed name for easy deletion. Mongofiles-port 12345-d xxx Delete newname//mongofies to kill

————————————————————————————————– The following is another My.ini configuration recommendation: port=3306 Default-character-set=latin1 Default-storage-engine=innodb Sql-mode= "Strict_trans_tables,no_auto_create_user,no_engine_substitution" max_connections=120 query_cache_size=32m #缓存数据表数量, set this parameter to see the open_tables in the System state (representing the total number of currently open data tables) and Opened_tables (representing the total number of open tables) table_cache=2

...... table_cache=512 ...... myisam_max_sort_file_size=100g myisam_max_extra_sort_file_size=100g myisam_sort_buffer_size=128m key_buffer_size=1024m read_buffer_size=512m ...... Thread_concurrency=8 Web caching based on reverse proxy: such as Nginx,squid,mod_proxy (apache2 above and divided into Mod_proxy and Mod_cache) Examples of Nginx Copy Code code as follows: #user nobody; Worker_process

back_log=200 interactive_timeout=7200 query_cache_size=64m ...... table_cache=512 ...... myisam_max_sort_file_size=100g myisam_max_extra_sort_file_size=100g myisam_sort_buffer_size=128m key_buffer_size=1024m read_buffer_size=512m ...... Thread_concurrency=8 Ix. Web caching based on reverse proxy such as Nginx,squid,mod_proxy (apache2 above and divided into Mod_proxy

with a colon : split into multiple fields and print out the contents of the 1th column field How to specify multiple delimiters in awk at the same time For example, now there is a file Some.log file content as follows Grape (100g) 1980 raisins (500g) 1990 Plum (240g) 1997 Apricot (180g) nectarine (200g) 2008 Now we want to split the Some.log file by the "Fruit Name (weight) year". $ Awk-f ' [()] ' {print $ $ $ $ $} ' Some.log Grape

I. Purpose When using the CentOS6.3 version Linux system, found that the root directory (/) of the space is not sufficient, and other directory space has a lot of free, so this article is mainly for the existing space to adjust. First, let's look at the space allocation of the system: [Plain] View plaincopyprint? 01.[root@centos-78/]# df-h 02.Filesystem Size Used avail use% mounted on 03./dev/mapper/vg_centos-lv_root 50G 14G 34G 30%/ 05.tmpfs 1.9G 0 1.9G 0%/dev/shm 06./DEV/SDA1 485M 37

network, using the most commonly used 10GBASE-SR transceiver, the longest transmission distance of only 33 meters. After the transformation, the OM3 fiber +mpo connector is used to support the transmission distance of the 10GBASE-SR. and can be within 100 meters distance, support the future next generation 40G or even 100G ethernet. At present, switch manufacturers have introduced 100G Ethernet interface B

creation time, but will be set to zero as needed in the future when the write operation is first performed from the virtual machine. Thick provisioning 0 (tick provision eager zeroed)Create a thick disk that supports clustering functions, such as Fault tolerance. Allocate the required space for the virtual disk when you create it. In contrast to the thick provisioning delay of setting the 0 format, the data retained on the physical device is set to zero during the creation process. The amount o

http://wubx.net/AllInnoDB Engine Optimizationinnodb_buffer_pool_size (interview must ask)The main storage of heat data, according to page to store, page is the smallest unit, or even by paragraph to storeRecommended value: 50%-75% of physical memory recommended for private database serverIf other services are available, then the "principle of 2/8" is recommended:For example, 100G of data, at least 10% of active data, it is recommended that buffer

for long Co Lumn data. See section 14.14, "InnoDB row Storage and Row Formats".Innodb_support_xa默认为true，如果关闭则binlog记录事务的顺序可能与实际不符 1. prepare ，然后将redo log持久化到磁盘 2. 如果前面prepare成功，那么再继续将事务日志持久化到binlog 3. 如果前面成功，那么在redo log里面写上一个commit记录 那么假如在进行着三步时又任何一步失败，crash recovery是怎么进行的呢? 此时会先从redo log将最近一个检查点开始的事务读出来，然后参考binlog里面的事务进行恢复。 如果是在1 crash，那么自然整个事务都回滚； 如果是在2 crash，那么也会整个事务回滚； 如果是在3 crash（仅仅是commit记录没写成功），那么没有关系因为2中已经记录了此次事务的binlog，所以将这个进行commit。所以总结起来就是redo log里凡是prepare成功，但commit失败的事务都会先去binlog查找