假如你的redolog 分為三個(gè)組，每個(gè)組至少有兩個(gè)成員，并且這三個(gè)組最好別放在同一塊物理磁盤上，分別放在兩三個(gè)不同的物理磁盤上，這樣這三個(gè)組是通過log switch 是自動(dòng)切換的，等第一組寫完進(jìn)行切換到第二組，第三組是一個(gè)循環(huán)的過程，

oracle強(qiáng)制切換redo log組步驟

1、desc v$log;
?Name????????????????????????????????????? Null???? Type
?----------------------------------------- -------- ----------------------------
?GROUP#???????????????????????????????????????????? NUMBER
?THREAD#??????????????????????????????????????????? NUMBER
?SEQUENCE#????????????????????????????????????????? NUMBER
?BYTES????????????????????????????????????????????? NUMBER
?MEMBERS??????????????????????????????????????????? NUMBER
?ARCHIVED?????????????????????????????????????????? VARCHAR2(3)
?STATUS???????????????????????????????????????????? VARCHAR2(16)
?FIRST_CHANGE#????????????????????????????????????? NUMBER
?FIRST_TIME???????????????????????????????????????? DATE
2、select group#,thread#,sequence#,status from v$log;

??? GROUP#??? THREAD#? SEQUENCE# STATUS
---------- ---------- ---------- ----------------
???????? 1????????? 1????????? 8 INACTIVE
???????? 2????????? 1????????? 9 CURRENT
???????? 3????????? 1????????? 7 INACTIVE
3、alter system switch logfile;

System altered.
4、
SQL> select group#,thread#,sequence#,status from v$log;

??? GROUP#??? THREAD#? SEQUENCE# STATUS
---------- ---------- ---------- ----------------
???????? 1????????? 1????????? 8 INACTIVE
???????? 2????????? 1????????? 9 ACTIVE
???????? 3????????? 1???????? 10 CURRENT

很明顯上面狀態(tài)列已經(jīng)發(fā)生了變化。

轉(zhuǎn)載于:https://blog.51cto.com/oklinux/846816

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