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2025-01-17 Update From: SLTechnology News&Howtos shulou NAV: SLTechnology News&Howtos > Servers >
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In this issue, Xiaobian will bring you a comparison of how to carry out AR, streams and DataGuard. The article is rich in content and analyzes and narrates from a professional perspective. After reading this article, I hope you can gain something.
Oracle Backup Features
Includes:
Advanced Replication
Streams Replication
Dataguard
A dataguard:
Dataguard is generally the first choice for DBAs in terms of high availability and disaster recovery. After all, dataguard has an overwhelming advantage in this regard. Whether it is a physical standby database or a logical standby database, they all have some common characteristics.
Cost of configuration and management: dataguard is simpler and easier than stream replication; cost of security and stability: dataguard is more stable and reliable than stream replication. www.ExamW.CoM
For a 24x7 system, these are very important. The increase of system downtime not only affects the image of the company, but also affects the efficiency of the company. With dataguard, the security of data is quite guaranteed. The physical standby library can complete the failover in the shortest time. The logical standby library can also undertake a large number of reports and other services while ensuring the security of data. Since the configuration and management of dataguard are relatively simple, the work intensity of dba is also reduced.
Two-tier replication:
Applicable to:
A partial copy stream can copy only certain tables or certain schemas.
2. Heterogeneous environment makes full use of existing equipment and technology
3. Remote disaster recovery stream has lower network requirements than dataguard.
Stream replication has a flexible replication strategy, not only can you configure to replicate only certain tables, you can also configure to replicate only ddl or dml on certain tables, compared to dataguard must replicate the entire database, you can save considerable storage investment, after all, for some massive data, there are many unnecessary replication.
If in a heterogeneous environment, that is, different operating systems, then dataguard will be helpless, only stream replication, so that you can make full use of the existing environment, configure high-use solutions, in a heterogeneous environment, stream replication will be a strong opponent of advanced replication.
Stream replication propagates logical change records (LCRs) that have been mined and packaged by logmnr. Compared with dataguard's method of transmitting archived redo log, mview log of advanced replication and mview refresh, stream replication reduces the network demand a lot. In the process of remote disaster recovery, renting network bandwidth is a high cost, and stream replication can appropriately reduce this cost.
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