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maximum protection 轉(zhuǎn) maximum availability

發(fā)布時間：2020-08-04 20:07:23 來源：ITPUB博客 閱讀：109 作者：大鯊魚o0O 欄目：關(guān)系型數(shù)據(jù)庫
PS：該實驗建立在之前DG博客的基礎(chǔ)之上的

主庫之前的狀態(tài)，執(zhí)行轉(zhuǎn)換語句，主庫之后的狀態(tài)

  1. 15:00:01 SYS @ slow >select name,database_role,protection_mode from v$database;

  3. NAME     DATABASE_ROLE PROTECTION_MODE
  4. --------- ---------------- --------------------
  5. SLOW     PRIMARY     MAXIMUM PROTECTION

  7. 1 row selected.

  9. Elapsed: 00:00:00.00
  10. 15:00:35 SYS @ slow >select status from v$instance;

  12. STATUS
  13. ------------
  14. OPEN

  16. 1 row selected.

  18. Elapsed: 00:00:00.00
  19. 18:57:24 SYS @ slow >startup mount force;
  20. ORACLE instance started.

  22. Total System Global Area 521936896 bytes
  23. Fixed Size         2254824 bytes
  24. Variable Size         377489432 bytes
  25. Database Buffers     138412032 bytes
  26. Redo Buffers         3780608 bytes
  27. Database mounted.
  28. 18:57:44 SYS @ slow >select name,database_role,protection_mode from v$database;

  30. NAME     DATABASE_ROLE PROTECTION_MODE
  31. --------- ---------------- --------------------
  32. SLOW     PRIMARY     MAXIMUM PROTECTION

  34. 1 row selected.

  36. Elapsed: 00:00:00.01
  37. 18:58:20 SYS @ slow >select status from v$instance;

  39. STATUS
  40. ------------
  41. MOUNTED

  43. 1 row selected.

  45. Elapsed: 00:00:00.01
  46. 18:58:39 SYS @ slow >alter database set standby database to maximize availability;

  48. Database altered.

  50. Elapsed: 00:00:00.00
  51. 19:00:09 SYS @ slow >alter database open;

  53. Database altered.

  55. Elapsed: 00:00:03.03
  56. 19:00:25 SYS @ slow >select name,database_role,protection_mode from v$database;

  58. NAME     DATABASE_ROLE PROTECTION_MODE
  59. --------- ---------------- --------------------
  60. SLOW     PRIMARY     MAXIMUM AVAILABILITY

  62. 1 row selected.

  64. Elapsed: 00:00:00.00
  65. 19:01:20 SYS @ slow >

備庫之前的狀態(tài)，主庫執(zhí)行轉(zhuǎn)換語句，備庫之后的狀態(tài)  ，，，一切正常，轉(zhuǎn)換成功?。?！

  1. 14:56:33 SYS @ gotime >select name,database_role,protection_mode from v$database;

  3. NAME     DATABASE_ROLE PROTECTION_MODE
  4. --------- ---------------- --------------------
  5. SLOW     PHYSICAL STANDBY MAXIMUM PROTECTION

  7. 1 row selected.

  9. Elapsed: 00:00:00.00
  10. 14:57:21 SYS @ gotime >select status from v$instance;

  12. STATUS
  13. ------------
  14. OPEN

  16. 1 row selected.

  18. Elapsed: 00:00:00.00
  19. 18:56:45 SYS @ gotime >startup mount force;
  20. ORACLE instance started.

  22. Total System Global Area 521936896 bytes
  23. Fixed Size         2254824 bytes
  24. Variable Size         377489432 bytes
  25. Database Buffers     138412032 bytes
  26. Redo Buffers         3780608 bytes
  27. Database mounted.
  28. 18:57:07 SYS @ gotime >select name,database_role,protection_mode from v$database;

  30. NAME     DATABASE_ROLE PROTECTION_MODE
  31. --------- ---------------- --------------------
  32. SLOW     PHYSICAL STANDBY MAXIMUM AVAILABILITY

  34. 1 row selected.

  36. Elapsed: 00:00:00.04
  37. 19:02:08 SYS @ gotime >





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