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App Inventor 2 SQLite 拓展：超流行兼容主流SQL语法的迷你本地数据库引擎...
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Should MySQL have its timezone set to UTC?
... will choose for his/her server and how he/she will store date and time.
MySQL Timezone Cheatsheet
Notes:
Changing the timezone will not change the stored datetime or
timestamp, but it will select a different datetime from
timestamp columns
Warning! UTC has leap seconds, these look like '2012-...
记一次MongoDB性能问题 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...使用ext3，可能会遇到这类问题，所以还是大概介绍一下如何解决：
MongoDB按需自动生成数据文件：先是<DB>.0，大小是64M，然后是<DB>.1，大小翻番到128M，到了<DB>.5，大小翻番到2G，其后的数据文件就保持在2G大小。为了避免可能出...
MySql : Grant read only options?
...rants, and change it around to create a new user with similar privileges:
mysql> SHOW GRANTS FOR 'not_leet'@'localhost';
+------------------------------------------------------------------------------------------------------------------------------------+
| Grants for not_leet@localhost ...
Amazon EC2, mysql aborting start because InnoDB: mmap (x bytes) failed; errno 12
...EC2 Linux Micro instance. Since Micro instances have only 613MB of memory, MySQL crashed every now and then. After a long search about MySQL, Micro Instance and Memory Managment I found out there is no default SWAP space for Micro instance. So if you want to avoid the crash you may need to setup a s...
mysqldump - Export structure only without autoincrement
I have a MySQL database and I am trying to find a way to export its structure only, without the auto increment values. mysqldump --no-data would almost do the job, but it keeps the auto_increment values. Is there any way to do it without using PHPMyAdmin (that I know it can do it)?
...
Bash if statement with multiple conditions throws an error
...ration by reading an entrypoint.sh script written by the contributors from MySQL that checks whether the specified variables were set.
As the script shows, you can pipe them with -a, e.g.:
if [ -z "$MYSQL_ROOT_PASSWORD" -a -z "$MYSQL_ALLOW_EMPTY_PASSWORD" -a -z "$MYSQL_RANDOM_ROOT_PASSWORD" ]; the...
How to execute a bash command stored as a string with quotes and asterisk [duplicate]
...l meaning when it's naked or in double quoted strings: use single quotes.
MYSQL='mysql AMORE -u username -ppassword -h localhost -e'
QUERY="SELECT "'*'" FROM amoreconfig" ;# <-- "double"'single'"double"
eval $MYSQL "'$QUERY'"
Bonus: It also reads nice: eval mysql query ;-)
...
Apache .htaccess 禁止访问某目录方法 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...要利用.htaccess对某个目录下的文档设定访问用户和对应的密码，首先要做的是生成一个.htpasswd的文本文档，使用
htpasswd -c d:/passwords wwq
输入用户密码即可生成.htpasswd的文本文档
在.htaccess文件中加入：
AuthType Basic
AuthName "Restric...
mongo group query how to keep fields
...the key(s) in arguments. How to keep the first document in each group like mysql query group.
for example:
11 Answers
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