Wednesday, October 31, 2012

ASM Плюсы и Минусы



ASM как таковой мне нравится, но в администрирование занимает больше ресурсов. В простых инстанциях его ат-инсталлировал.

Плюсы:
1. достаточно большая пропускная способность, по сравнению с ЕХТ3, ЕХТ4 + АSYNC I/O. С АSYNC на 11.2.0.2 г версии есть проблемы.
2. ДБА трудно удалить, сделать ошибку и удалить дата файлы.
3. ребаланс данных возможен, по всем дискам.
4. возможно использовать без RAID.
5. RAC и только в нем лучше использовать ASM, в Single instance насоветую, если только не хотите экономить на дисках и покупать дорогостоящий массив.
6. В системах где редко делают патчинг может и можно использовать.


Минусы:
1.Трудно администрировать, делать UPGRADE, PATCHING итд. Каждый раз при смене KERNEL надо менять ASM libraries. Может если LINUX от ORACLE, может не так и плохо, там всё включено, но у меня RHEL. У нас патчинг каждый квартал. Соответственно надо тест, Preproduction,production upgrade. People ресурсов не напасёшься на ASM.

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