ORACLE Sequence
1. cache属性：
优点：可以在内存中存放一定个数，减少磁盘I/O，提升性能；
2. 不能往后调当前值，可以往前调，通过调整增量：
Alter sequence 序列名 set increment = 数字;
3. 如果定义了cycle，但是没有定义minvalue，当到达最大值之后，nextval是1
修改最小值：
alter sequence 序列名 set minvalue = 数字；
Nginx Proxy & Load Balance & LNMP
Nginx Proxy Service E-commerce website Server 1: provide image request response ( apache / nginx ) Server 2: provide dynamic request response ( php-fpm / apache-php ) Server 3: provide static request response ( apache / nginx ) Server 4: provide data request response ( mysql ) It need one additional nginx server 1. Install nginx 2. proxy to specific server Example location / { proxy_pass http://192.168.199.187:80/; } location /bbs/ { proxy_pass http://192.168.199.187:80/bbs/; } location ~* \.(jpg|png|gif)$ { proxy_pass http://172.16.100.7; } Enhance the log information and specific the hostname location / { proxy_pass http://192.168.199.187:80/; proxy_set_header <parameter name> $host; (client requst the hostname ) proxy_set_header <parameter name> $remote_addr; ...
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