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Doug 的技術園地

Monday, March 21, 2016. 5 ways to initialize lazy relations and when to use them. Lazy loading of relations between entities is a well established best practice in JPA. Its main goal is to retrieve only the requested entities from the database and load the related entities only if needed. That is a great approach, if we only need the requested entities. But it creates additional work and can be the cause of performance problems, if we also need some of the related entities. Class, orderId);. OK, that are...

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Doug 的技術園地 | chen7768.blogspot.com Reviews

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Monday, March 21, 2016. 5 ways to initialize lazy relations and when to use them. Lazy loading of relations between entities is a well established best practice in JPA. Its main goal is to retrieve only the requested entities from the database and load the related entities only if needed. That is a great approach, if we only need the requested entities. But it creates additional work and can be the cause of performance problems, if we also need some of the related entities. Class, orderId);. OK, that are...

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Doug 的技術園地 | chen7768.blogspot.com Reviews

https://chen7768.blogspot.com

Monday, March 21, 2016. 5 ways to initialize lazy relations and when to use them. Lazy loading of relations between entities is a well established best practice in JPA. Its main goal is to retrieve only the requested entities from the database and load the related entities only if needed. That is a great approach, if we only need the requested entities. But it creates additional work and can be the cause of performance problems, if we also need some of the related entities. Class, orderId);. OK, that are...

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chen7768.blogspot.com

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Doug 的技術園地: Linux 同步系統時間

http://chen7768.blogspot.com/2014/10/linux.html

Wednesday, October 1, 2014. 在 Linux 中，可以利用 ntpdate -s time.stdtime.gov.tw 同步全球標準時間，也可以利用 Cron 去自動同步. 30 * * * * (/usr/sbin/ntpdate -s time.stdtime.gov.tw; /usr/sbin/hwclock -w) /dev/null 2 &1. Subscribe to: Post Comments (Atom). 台北市(Taipei City), Taiwan. View my complete profile. Picture Window template. Powered by Blogger.

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Doug 的技術園地: October 2013

http://chen7768.blogspot.com/2013_10_01_archive.html

Saturday, October 19, 2013. Database or File system 的 HA 設定. 若是工作上是做為 Application Hosting Service 的性質，HA 應該是無可避免的，以下的參考文章，是一個不錯但又省錢的 HA 方式. HA-DRBD Heartbeat 建置 MySQL 高可用性. Node1 及 Node2 共同設定. 步驟1關閉 IPTables 及 SELinux. 步驟6載入 drbd 模組並建立 resource. Node1 及 Node2 共同設定. 步驟1設定 Heartbeat 設定檔 - ha.cf. 步驟2設定 Heartbeat 設定檔 - haresources. 步驟3設定 Heartbeat 設定檔 - authkeys. 步驟4設定 Heartbeat 服務設定檔 - mysql. CentOS 5.4 32 bit (Linux 2.6.18-164.el5) * 2台. Dev/hdb 10GB (Database Files). Cluster Reousrce Name： ha. Service ipt...

3

Doug 的技術園地: August 2013

http://chen7768.blogspot.com/2013_08_01_archive.html

Sunday, August 25, 2013. 看到 Steven Ballmer 即將退休，也証明了沒有任何帝國是永久的。微軟自 Windows 95 統治了 PC 近 15 年的時間，但卻因手機的變格失去了另一個世界. 接下來也許是 Google 統治的網路世界，但是，下一波革命也許是跨越網路的另一個空間. Subscribe to: Posts (Atom). 台北市(Taipei City), Taiwan. View my complete profile. Picture Window template. Powered by Blogger.

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Doug 的技術園地: Postgresql 9 replication

http://chen7768.blogspot.com/2014/05/postgresql-9-replication.html

Tuesday, May 6, 2014. Rpm -ivh http:/ yum.postgresql.org/9.3/redhat/rhel-6-x86 64/pgdg-centos93-9.3-1.noarch.rpm. Etc/init.d/postgresql-9.2 initdb. Sudo -u postgres psql -c "CREATE USER replicator REPLICATION LOGIN ENCRYPTED PASSWORD 'thepassword';". Listen address = '*' make sure we're listening as appropriate. Wal level = hot standby. Max wal senders = 3. Checkpoint segments = 8. Wal keep segments = 8. STEP4:在Master上修改/var/lib/pgsql/9.2/data/pg hba.conf. Sudo service postgresql-9.2 stop. Picture Window...

5

Doug 的技術園地: January 2014

http://chen7768.blogspot.com/2014_01_01_archive.html

Thursday, January 9, 2014. 如何檢測 Linux 的 open connection. Is used to display network connections, routing tables and a whole bunch of network and interface stats. On the other hand is used to list out open files. So, if you want to find out what all files are currently open just run lsof. And since in Linux "Everything is a File", we can use lsof to print network connections too. Lets start learning by resolving common queries. How to display a list of open ports? Netstat -n -A inet. Netstat -n -A inet.

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Doug 的技術園地

Monday, March 21, 2016. 5 ways to initialize lazy relations and when to use them. Lazy loading of relations between entities is a well established best practice in JPA. Its main goal is to retrieve only the requested entities from the database and load the related entities only if needed. That is a great approach, if we only need the requested entities. But it creates additional work and can be the cause of performance problems, if we also need some of the related entities. Class, orderId);. OK, that are...

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The Days of My Life. Thursday, September 4, 2008. New Blog Part II. Yes, I know i havent been updating lately thats why ive deleted all my previous postSs so that my new bloggy can have a new start. Yay! And Hello to new readers if i there is any. I think this blog only has 3 readers for now: The bf, loo and voon. Sigh. But now that i have got my new phone, Sony Erricson C902! Oh and for this whole week i will have to wear my glasses to uni and everywhere else i go! Subscribe to: Posts (Atom).

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