onbar的日志抢救备份

如果我们的数据库那天日志没有备份完，而此时数据库突然宕掉后不能启动，那么我们的这几个日志就没有备份。如果此时恢复的话是有几个日志不能恢复的，为了不让我们的数据丢失，我们就需要把没有备份的日志备份到磁带上。

用onbar -b -l -s起用抢救模式，在数据库停止的状态下可以备份日志。

这个也是出了问题在领导那里学习的，以前没有用过。呵呵。

[informix@test ~]$ onbar
/home/informix/bin/onbar_d
onbar usage

BACKUP & VERIFICATION
=====================
For IBM Informix Dynamic Server:
-b [-L ] [-w | -f | ] [-O]
-b -F
-b -l [-c | -C | -s] [-O]
-v [-w] [-p] [-t ] [-f | ]

-b backup
-c backup current logical log
-C continuous logical log backup
-f pathname of file containing list of storage spaces
-F fake backup
-l backup full logical logs (no spaces)
-L backup level: 0, 1, or 2, defaults to 0
-O override internal error checks - enforce policy strictly
-p backup spaces only (no logs)
-w whole system backup
-s salvage logs
-v verify consistency of most recent backups
list of storage spaces to backup
onbar usage

RESTORE
========
For IBM Informix Dynamic Server:
-r [-e] [-O] [-f | ]
-r [-e] [-t | -n ] [-O]
-r -p [-e] [-t ] [-O] [-f | ]
-r -l [-t | -n ]
-r -w [-e] [[-p] [ -t ] | -n ] [-O]
-RESTART
-r -rename -f [-w] [-p] [-t | -n ]
[-f | ]
-r {-rename -p -o -n
-o ...} [-w] [-p] [-t | -n ]
[-f | ]

-e external restore
-f pathname of file containing list of storage spaces
-l logical log only restore (no spaces)
-n last logical log to restore
-O override internal error checks - enforce policy strictly
-p physical only restore (no logs)
-r restore
-t point in time to stop restore
-w whole system to restore
-RESTART restart an interrupted restore
list of storage spaces to restore
-rename rename chunks during cold restore
With -rename option:
-rename -f pathname of file containing list of mapped
chunk pathnames and offsets
-p old pathname of chunk
-o old offset of chunk
-n new pathname of chunk
-o new offset of chunk
onbar usage

MESSAGING
=========
For IBM Informix Dynamic Server:

-m [] [-r []]

-m Displays last of onbar's activity log file (default: 20 lines)
-r Repeat display every seconds (default: 5 seconds)

onbar usage

LOGICAL-LOG(S) DISPLAY
======================
For IBM Informix Dynamic Server:
{-P} {-n | ending log unique identifier>} [-l] [-q] [-b] [-u ]
[-t ] [-x

-P Print backed up logical-log(s) information
-n Display the specified log identifier(s)
-l Display maximum information about each log record
-q Do not display program header
-b Display information about logged BLOB pages
-u Display the specified user(s)
-t Display the specified TBLspace(s)
-x Display the specified transaction(s)
[informix@test ~]$