11g 日志传输压缩模式
[20181112]11g 日志傳輸壓縮模式.txt
--//由于主備庫不在一個局域網內,一樣采用級聯模式,先傳輸日志到一臺主機,然后在由這臺備庫傳輸日志到遠端的dataguard備庫.
--//這樣一定程度減輕主庫負擔,另外加快日志應用,這樣影響小一點,另外一種方式日志傳輸模式采用壓縮模式.以前自己也測試過.
--//鏈接:http://blog.itpub.net/267265/viewspace-1143480/
--//工作需要,重復驗證看看.
1.環境:
SCOTT@book> @ ver1
PORT_STRING ? ? ? ? ? ? ? ? ? ?VERSION ? ? ? ?BANNER
------------------------------ -------------- --------------------------------------------------------------------------------
x86_64/Linux 2.4.xx ? ? ? ? ? ?11.2.0.4.0 ? ? Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production
SCOTT@book> show parameter log_archive_dest_2
NAME ? ? ? ? ? ? ? TYPE ? VALUE
------------------ ------ -----------------------------------------------------------------------------------------------
log_archive_dest_2 string SERVICE=bookdg LGWR ASYNC AFFIRM VALID_FOR=(ONLINE_LOGFILES,PRIMARY_ROLE) DB_UNIQUE_NAME=bookdg
SCOTT@book> alter system set log_archive_dest_2='SERVICE=bookdg LGWR ASYNC AFFIRM compression=enable VALID_FOR=(ONLINE_LOGFILES,PRIMARY_ROLE) DB_UNIQUE_NAME=bookdg';
System altered.
--//這樣就ok了.
2.如何驗證日志傳輸是壓縮的呢?
--//首先在主備庫打開歸檔跟蹤:
--//主庫:
SCOTT@book> alter system set log_archive_trace=16;
ystem altered.
--//備庫:
SCOTT@bookdg> alter system set log_archive_trace=16;
System altered.
SYS@book> alter system archive log current;
System altered.
$ ps -ef | egrep "ns[a]|UI[D]"
UID ? ? ? ?PID ?PPID ?C STIME TTY ? ? ? ? ?TIME CMD
oracle ? 44236 ? ? 1 ?0 09:05 ? ? ? ? ?00:00:24 ora_nsa2_book
--//nsa進程號44236
$ ls -l *44236*.trc
-rw-r----- 1 oracle oinstall 46407479 2018-11-12 15:10:24 book_nsa2_44236.trc
--//發現log_archive_trace=16;記錄信息有點多.
SYS@book> alter system set log_archive_trace=1;
System altered.
$ tail -f book_nsa2_44236.trc
*** 2018-11-12 15:11:36.093
*** 2018-11-12 15:11:36.093 1274 krsu.c
RFS message number 23059 (RFSWRITE)
RTC: Compression ratio for this I/O is 81%
*** 2018-11-12 15:11:37.094
*** 2018-11-12 15:11:37.094 1274 krsu.c
RFS message number 23060 (RFSWRITE)
RTC: Compression ratio for this I/O is 82%
*** 2018-11-12 15:11:38.095
*** 2018-11-12 15:11:38.095 1274 krsu.c
RFS message number 23061 (RFSWRITE)
RTC: Compression ratio for this I/O is 80%
*** 2018-11-12 15:11:39.096
*** 2018-11-12 15:11:39.096 1274 krsu.c
RFS message number 23062 (RFSWRITE)
RTC: Compression ratio for this I/O is 81%
$ grep "RTC:" book_nsa2_44236.trc | sort|uniq -c
? ? ? 1 RTC: Compression ratio for this I/O is 77%
? ? ? 5 RTC: Compression ratio for this I/O is 79%
? ? ?16 RTC: Compression ratio for this I/O is 80%
? ? ?50 RTC: Compression ratio for this I/O is 81%
? ? ?26 RTC: Compression ratio for this I/O is 82%
? ? ? 3 RTC: Compression ratio for this I/O is 83%
? ? ? 1 RTC: Compression ratio for this I/O is 85%
--//可以發現壓縮率非常高.產生一些事務看看:
SCOTT@book> create table t as select * from dba_objects ;
Table created.
SCOTT@book> update t set OBJECT_NAME=lower(OBJECT_NAME);
86993 rows updated.
SCOTT@book> commit ;
Commit complete.
$ grep "RTC:" book_nsa2_44236.trc | sort|uniq -c
? ? ? 1 RTC: Compression ratio for this I/O is 46%
? ? ? 1 RTC: Compression ratio for this I/O is 48%
? ? ? 1 RTC: Compression ratio for this I/O is 50%
? ? ? 4 RTC: Compression ratio for this I/O is 55%
? ? ? 1 RTC: Compression ratio for this I/O is 56%
? ? ? 1 RTC: Compression ratio for this I/O is 57%
? ? ? 3 RTC: Compression ratio for this I/O is 58%
? ? ? 1 RTC: Compression ratio for this I/O is 59%
? ? ? 1 RTC: Compression ratio for this I/O is 63%
? ? ? 1 RTC: Compression ratio for this I/O is 64%
? ? ? 2 RTC: Compression ratio for this I/O is 68%
? ? ? 1 RTC: Compression ratio for this I/O is 69%
? ? ? 4 RTC: Compression ratio for this I/O is 72%
? ? ? 3 RTC: Compression ratio for this I/O is 74%
? ? ? 1 RTC: Compression ratio for this I/O is 75%
? ? ? 5 RTC: Compression ratio for this I/O is 76%
? ? ? 5 RTC: Compression ratio for this I/O is 77%
? ? ? 6 RTC: Compression ratio for this I/O is 78%
? ? ?20 RTC: Compression ratio for this I/O is 79%
? ? ?66 RTC: Compression ratio for this I/O is 80%
? ? ?99 RTC: Compression ratio for this I/O is 81%
? ? ?50 RTC: Compression ratio for this I/O is 82%
? ? ?19 RTC: Compression ratio for this I/O is 83%
? ? ?21 RTC: Compression ratio for this I/O is 84%
? ? ? 4 RTC: Compression ratio for this I/O is 85%
--//壓縮率也能達到50%以上.
3.在備庫觀察:
SYS@bookdg> @ &r/dg/dg
PROCESS ? ? ? PID STATUS ? ? ? CLIENT_P GROUP# ?THREAD# ?SEQUENCE# ? ? BLOCK# ? ? BLOCKS DELAY_MINS
--------- ------- ------------ -------- ------- ------- ---------- ---------- ---------- ----------
RFS ? ? ? ? 28207 IDLE ? ? ? ? ARCH ? ? N/A ? ? ? ? ? 0 ? ? ? ? ?0 ? ? ? ? ?0 ? ? ? ? ?0 ? ? ? ? ?0
ARCH ? ? ? ?28364 CONNECTED ? ?ARCH ? ? N/A ? ? ? ? ? 0 ? ? ? ? ?0 ? ? ? ? ?0 ? ? ? ? ?0 ? ? ? ? ?0
RFS ? ? ? ? 28205 IDLE ? ? ? ? LGWR ? ? 1 ? ? ? ? ? ? 1 ? ? ? ?731 ? ? ? ?251 ? ? ? ? ?1 ? ? ? ? ?0
ARCH ? ? ? ?28362 CLOSING ? ? ?ARCH ? ? 4 ? ? ? ? ? ? 1 ? ? ? ?727 ? ? ? ? ?1 ? ? ? ?513 ? ? ? ? ?0
ARCH ? ? ? ?28360 CLOSING ? ? ?ARCH ? ? 5 ? ? ? ? ? ? 1 ? ? ? ?728 ? ? ?73728 ? ? ? 1902 ? ? ? ? ?0
ARCH ? ? ? ?28366 CLOSING ? ? ?ARCH ? ? 5 ? ? ? ? ? ? 1 ? ? ? ?730 ? ? ?88064 ? ? ? 1750 ? ? ? ? ?0
MRP0 ? ? ? ?28162 APPLYING_LOG N/A ? ? ?N/A ? ? ? ? ? 1 ? ? ? ?731 ? ? ? ?251 ? ? 102400 ? ? ? ? ?0
7 rows selected.
--//可以確定接收的進程當前是28205. 備庫:
$ grep RTC: bookdg_rfs_28205.trc | less
...
RTC: decompressed 232440 bytes to 1048576 bytes
RTC: decompressed 785 bytes to 3072 bytes
RTC: decompressed 222314 bytes to 1048576 bytes
RTC: decompressed 1396 bytes to 5120 bytes
RTC: decompressed 217892 bytes to 1048576 bytes
RTC: decompressed 1564 bytes to 5632 bytes
RTC: decompressed 223295 bytes to 1048576 bytes
RTC: decompressed 115 bytes to 512 bytes
RTC: decompressed 189832 bytes to 1048576 bytes
RTC: decompressed 2941 bytes to 14848 bytes
RTC: decompressed 192267 bytes to 1048576 bytes
RTC: decompressed 610 bytes to 2560 bytes
RTC: decompressed 192315 bytes to 1048576 bytes
RTC: decompressed 531 bytes to 2048 bytes
RTC: decompressed 191932 bytes to 1048576 bytes
RTC: decompressed 597 bytes to 2560 bytes
RTC: decompressed 193008 bytes to 1048576 bytes
RTC: decompressed 655 bytes to 2560 bytes
RTC: decompressed 5732 bytes to 28160 bytes
RTC: decompressed 194474 bytes to 1048576 bytes
RTC: decompressed 591 bytes to 2560 bytes
RTC: decompressed 174682 bytes to 1048576 bytes
RTC: decompressed 505 bytes to 2560 bytes
RTC: decompressed 4911 bytes to 27648 bytes
RTC: decompressed 159418 bytes to 1048576 bytes
RTC: decompressed 249 bytes to 1024 bytes
RTC: decompressed 4773 bytes to 27648 bytes
RTC: decompressed 162834 bytes to 1048576 bytes
RTC: decompressed 532 bytes to 2560 bytes
RTC: decompressed 162426 bytes to 1048576 bytes
RTC: decompressed 566 bytes to 2560 bytes
RTC: decompressed 4941 bytes to 28160 bytes
RTC: decompressed 160794 bytes to 1048576 bytes
RTC: decompressed 279 bytes to 1024 bytes
RTC: decompressed 5578 bytes to 32256 bytes
RTC: decompressed 163626 bytes to 1048576 bytes
RTC: decompressed 561 bytes to 2560 bytes
RTC: decompressed 4761 bytes to 27136 bytes
RTC: decompressed 159520 bytes to 1048576 bytes
RTC: decompressed 559 bytes to 2560 bytes
RTC: decompressed 4918 bytes to 28672 bytes
RTC: decompressed 160996 bytes to 1048576 bytes
RTC: decompressed 281 bytes to 1024 bytes
RTC: decompressed 159494 bytes to 1048576 bytes
RTC: decompressed 160961 bytes to 1048576 bytes
RTC: decompressed 13209 bytes to 84992 bytes
RTC: decompressed 159411 bytes to 1048576 bytes
RTC: decompressed 154267 bytes to 836608 bytes
RTC: decompressed 205968 bytes to 1048576 bytes
RTC: decompressed 192858 bytes to 1048576 bytes
RTC: decompressed 201346 bytes to 1048576 bytes
RTC: decompressed 15110 bytes to 78336 bytes
RTC: decompressed 202438 bytes to 1048576 bytes
RTC: decompressed 204217 bytes to 1048576 bytes
--//從解壓看,壓縮比率還是蠻大的
4.RTC表示什么,猜測一下:
--//RTC應該表示redo transport compression
5.收尾:
SCOTT@book> alter system reset log_archive_trace;
System altered.
SYS@bookdg> alter system reset log_archive_trace;
System altered.
SYS@book> alter system set log_archive_dest_2='SERVICE=bookdg LGWR ASYNC AFFIRM VALID_FOR=(ONLINE_LOGFILES,PRIMARY_ROLE) DB_UNIQUE_NAME=bookdg';
System altered.
--//重啟主備庫.略.
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