Active data guard berjalan pada physical standby database dimana physical standby database ini dalam kondisi open read only tetapi proses applying archivelog tetap berjalan.
Dalam dokumentansi oracle mengenai physical dataguard ini,proses applying nya adalah block per block data. itu yg kenapa di oracle 9i dan 10g database harus dalam kondisi mount. di Oracle 11g feature tersebut di enhance, meski db bisa di open tapi kondisinya bukan read write dengan penekanan bahwa DG adalah konsep DRC sehingga data harus tetap konsisten dengan primary DB nya. CMIIW, real time apply adalah proses applying pada data guard agar data guard segera melakukan proses apply tanpa jeda. Jika dilihat dari permasalahan mas Wisnu, sepertinya beliau menggunakan oracle 11g standard edition dimana proses sending archivelog untuk dataguard harus secara manual atau menggunakan database streaming feature dimana proses apply nya menggunakan log miner. yang perlu diperhatikan active dataguard sudah terinclude di oracle 11g tapi license untuk mengactive-kan feature ini terpisah. jika di versi sebelumnya license oraclenya hanya untuk DRC database, maka utk active dataguard 11g licensenya plus license active dataguard. just sharing my opinion, kalo ada salah mohon maaf masi newbie. ________________________________ Dari: Mohammad Arief Pradipto <[email protected]> Kepada: [email protected] Terkirim: Sen, 23 November, 2009 15:35:49 Judul: Re: External Email: --> Re: External Email: --> [indo-oracle] Tanya Mirroring 2 server database Ngobrolin tentang Standby dan Production, Mungkin informasi juga untuk Mas Wisnu apakah sudah dapat informasi ini atau belum, bahwa Oracle 11G menyediakan fitur yang bernama 'Active DataGuard'. Fitur Active DataGuard ini secara harfiah artinya adalah, bahwa sementara physical standby database dibuka Read Only mode, database tersebut terus menerus mengapply transaksi-transaksi yang dilakukan di primary. Sebenarnya setau saya Fitur tersebut sudah 'tersedia' di Oracle 10G, dengan nama Oracle DataGuard Real Time Apply, tapi boleh ada yang konfirmasi ngg, saya ada baca artikel bahwa Active DataGuard harus bayar biaya tambahan. Setau saya dengan Oracle 10G saya tidak bayar tambahan untuk teknologi DataGuard, mungkin ada yang bisa kasih informasi? regards, adipt ============= http://www.dba-oracle.com/t_active_data_guard.htm Oracle active data guard tips Oracle Tips by Burleson Consulting July 18, 2008 Question: The Oracle marketing people are at-it again, and I noticed that within Oracle 11g "active" data guard is an extra cost option! In Oracle 10g, there was no distinction between an "active" data guard and an inactive one, so I wonder if Data Guard costs extra in Oracle 11g? Answer: The only way to know for sure if Data Guard is still free in 11g EE is to contract your CSR (customer support representative). Oracle is always re-naming products, and it's not uncommon for a single feature to have many names (e.g. Oracle VPD is the same as RLS). As to Data Guard, Oracle is slicing-off the functionality as Data Guard matures. You are correct, the Oracle web site says that Data Guard (SQL Apply and Redo Apply) comes as part of 10g Enterprise Edition (EE). Active Data Guard - Now an extra cost option? In 11g, "active data guard" is indeed an "option". The description suggests that "active" data guard is Data Guard with physical standby, opened for read-only transactions: Oracle Active Data Guard—an option for Oracle Database 11g Enterprise Edition—enhances Quality of Service by offloading resource-intensive activities from a production database to one or more synchronized standby databases. Oracle Active Data Guard enables read-only access to a physical standby database for queries, sorting, reporting, web-based access, etc., while continuously applying changes received from the production database. Oracle Active Data Guard also enables the use of fast incremental backups when offloading backups to a standby database, and can provide additional benefits of high availability and disaster protection against planned or unplanned outages at the production site. The docs also say that active data guard implies that it is essentially redo apply services used with physical standby: "If a license for the Oracle Active Data Guard option has been purchased, Redo Apply Services can also run on a physical standby database instance that is open." Let's look at the 11g new features for Data Guard. Oracle 11g Data Guard introduced several new features. The Oracle 11g New Features book<http://www.dba-oracle.com/t_11g_new_data_guard.htm> notes some Data Guard Pricing changes: "As site failures do not happen on a regular occurrence these disaster recovery (DR) servers can be sitting idle for long periods of time without any use or value being obtained. Prior to 11g businesses were unable to benefit as greatly from their DR investment. Oracle’s goal for 11g was to make DR cost effective, better utilize standby resources and allow for easy testing of DR. Data Guard is included with the Enterprise Edition of Oracle, but it should be noted that a named user or processor license may need to be purchased for the database. It’s always recommended to check with an Oracle sales." The book also confirms that "active Data Guard" is essentially Data Guard Physical Standby with read-only access: "Oracle Active Data Guard allows DBAs and users to run real-time queries on a physical standby system for reporting and other purposes while still seeing transactional consistent results. As opposed to previous versions where applying of logs had to stop while reporting was taking place, it now runs simultaneously. Oracle versions 9 and 10 couldn’t have the physical standby in readable state;11g has this and is fully synced. This ability makes an organizations DR investment much more valuable. This capability is known as Real-Time Query." ----- Original Message ----- From: wisnu dwi hidayat<mailto:[email protected]> To: [email protected]<mailto:[email protected]> Sent: Monday, November 23, 2009 12:33 PM Subject: External Email: --> Re: External Email: --> [indo-oracle] Tanya Mirroring 2 server database Dear Henri, Terima kasih telah merespon email saya. Saya sudah pakai standby pak dan sdah open read only... Dan standby saya memang saya gunakan buat reporting.. tapi synchronize archive file nya manual pakai cron job setiap 12 jam..(OS saya linux RHEL 5) saya maping directory archive yg di production (primary) ke standby dan saya copy archive production ke stanby dan saya recover pakai script yg saya jalankan pakai cronjob setiap 12 jam untuk autorecover di stanby; ORACLE_HOME=/OraHome/oracle11g/product/11.1.0/db_1;export ORACLE_HOME ORACLE_LIB_PATH=$ORACLE_HOME/lib;export ORACLE_LIB_PATH PATH=$PATH:$HOME/bin:$ORACLE_HOME/bin ORACLE_SID=PROD;export ORACLE_SID export PATH sqlplus /nolog <<eof conn / as sysdba; shutdown immediate; startup nomount; alter database mount standby database; recover standby database; auto alter database open read only; exit; eof Yg saya tanyakan gimana kalo server primary saya down trus saya switch ke standby yg DRP tanpa delay lama dan data tersebut realtime ... Kalo support oracle saya blum habis mungkin saya liat metalink.. Saya sudah googling dan ada penjelasan tentang dataguard dan RAC lantas mesti mana yg saya pakai..?? atau kalo punya link ke situs tutorial RAC atau dataguard boleh share ke saya.. regards, Wisnu ________________________________ From: Henri Alia Putra <[email protected]<mailto:henriap%40fif.astra.co..id>> To: "[email protected]<mailto:indo-oracle%40yahoogroups.com>" <[email protected]<mailto:indo-oracle%40yahoogroups.com>> Sent: Mon, November 23, 2009 10:48:00 AM Subject: RE: External Email: --> [indo-oracle] Tanya Mirroring 2 server database Dear Wisnu. Sebenarnya dengan memakai oracle 11g ,anda sudah mendapatkan future yang sangat oke untuk dataguard (di 10g sebenarnya juga sudah ada) dengan db 10g atau 11g tinggal anda buat standby redolog di kedua db, maka db anda tidak akan ada delay nya, guarantee oracle no data loss. kalau di 10g, standby db ,cuma bisa di baca dengan open read only, tapi kalau anda sudah memakai 11g , maka db standby bisa langsung dibaca,karena default sudah oen read only, jadi db tsb bisa anda manfaatkan sbg reporting. untuk cara pembuatannya ,tinggal googling ato menyelam di metalink. good luck Henri From: [email protected]<mailto:indo-oracle%40yahoogroups.com> [[email protected]<mailto:indo-oracle%40yahoogroups.com>] On Behalf Of wisnu dwi hidayat [[email protected]<mailto:wisnu_dh%40yahoo.com>] Sent: Monday, November 23, 2009 10:22 AM To: [email protected]<mailto:indo-oracle%40yahoogroups.com> Subject: External Email: --> [indo-oracle] Tanya Mirroring 2 server database Dear Masters & Members, Saya mo tanya nih.. gimana buat database server bisa syncrhonize real time antara 2 server.. seperti mirroring lah.. jadi seperti buat DRP gitu... server yg satunya akan di pakai jika terjadi gangguan pada yg primary tapi data server tersebut realtime dengan primary atau setidaknya ada delay brapa second lah... untuk koneksi kami miliki bandwith 2 mega 1:1.. Saat ini saya menggunakan Oracle 11g.. Saat ini selain production (primary) database saya hanya memiliki standby database yg synchronizenya tidak realtime( ada delay 12 jam).. Mohon saran dan bantuan para master sekalian yg telah berpengalaman.... Regards, Wisnu [Non-text portions of this message have been removed] This e-mail and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email by mistake please notify the sender by return e-mail and delete this message from your system. Any unauthorized use or dissemination of this e-mail in whole or in part is strictly prohibited. PT Federal International Finance, which has its seat at North of Jakarta, Indonesia, including its affiliated companies, shall not be liable for the improper or incomplete transmission of the information contained in this e-mail nor for any delay in its receipt or damage to your system. 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