DB2数据库：1、查看空间大小db2 list tablespaces show detail ，如下图；通过可用页数可以判断空间是否满2、查看数据库文件存放位置Db2 LIST TABLESPACE CONTAINERS FOR 表空间标识SHOW DETAIL 如下图：3、调整空间大小在现有数据文件扩容：alter tablespace datadbs extend(file'/home/db2inst1/db/r_dta_01' 1000M)增加新数据文件：alter tablespace datadbs add (file'/home/db2inst1/db/r_dta_02' 4096M)不指定单位（G,M,K）默认为页4、数据库的日志文件已满查看日志使用情况get db cfg for 数据库名修改日志文件大小：update db cfg for <dbname> using LOGFILSIZ 4096修改主日志文件个数：update db cfg for <dbname> using LOGPRIMARY 20修改辅助日志文件个数：update db cfg for <dbname> using LOGSECOND 10将数据库设置为空间自增加ALTER TABLESPACE库名AUTORESIZE YES查看是否为自增加get snapshot for tablespaces onORACLE数据库:1、查看空间大小Select table_name, sum(bytes) ,file_name from dba_data_files group by tablespace_name,查看未用空间大小：select sum(bytes)/(1024*1024) as free_space,tablespace_name from dba_free_space group by tablespace_name;汇总:SELECT A.TABLESPACE_NAME,A.BYTES TOTAL,B.BYTES USED,C.BYTES FREE,(B.BYTES*100)/A.BYTES "% USED",(C.BYTES*100)/A.BYTES "% FREE" FROMSYS.SM$TS_A V AIL A,SYS.SM$TS_USED B,SYS.SM$TS_FREE C WHERE A.TABLESPACE_NAME=B.TABLESPACE_NAME ANDA.TABLESPACE_NAME=C.TABLESPACE_NAME;2、调整空间大小增加新数据文件并自增长：alter tablespace 库名add datafile '/home/oracle/data_02.dbf' size 200m autoextend on next 10m maxsize 500m/unlimeted;在现有数据文件扩容：alter database datafile '/opt/oracle/ora_tbs/xwj_datafile01.dbf ' resize 200m;日志已满的处理方法ORA-00257: archiver error. Connect internal only, until freed archive log1. 用sys用户登录sqlplus sys/oracle@ora10g as sysdba2. 看看archiv log所在位置SQL> show parameter log_archive_dest;NAME TYPE V ALUE------------------------------------ ----------- ------------------------------log_archive_dest stringlog_archive_dest_1 stringlog_archive_dest_10 string3. 一般V ALUE为空时，可以用archive log list;检查一下归档目录和log sequenceSQL> archive log list;Database log mode Archive ModeAutomatic archival EnabledArchive destination USE_DB_RECOVERY_FILE_DESTOldest online log sequence 360Next log sequence to archive 360Current log sequence 3624. 检查flash recovery area的使用情况,可以看见archivelog已经很大了，达到96.62SQL> select * from V$FLASH_RECOVERY_AREA_USAGE;FILE_TYPE PERCENT_SPACE_USED PERCENT_SPACE_RECLAIMABLE NUMBER_OF_FILES------------ ------------------ ------------------------- ---------------CONTROLFILE .13 0 1 ONLINELOG 2.93 0 3 ARCHIVELOG 96.62 0 141 BACKUPPIECE 0 0 0 IMAGECOPY 0 0 0 FLASHBACKLOG 0 0 05. 计算flash recovery area已经占用的空间SQL> select sum(percent_space_used)*3/100 from v$flash_recovery_area_usage;SUM(PERCENT_SPACE_USED)*3/100-----------------------------2.99046. 找到recovery目录, show parameter recoverSQL> show parameter recover;NAME TYPE V ALUE------------------------------------ ----------- ------------------------------db_recovery_file_dest string /u01/app/oracle/flash_recovery_area db_recovery_file_dest_size big integer 5Grecovery_parallelism integer 07 上述结果告诉我们，归档位置用的是默认值，放在flash_recovery_area下(db_recovery_file_dest目录=/u01/app/oracle/flash_recovery_area)[root@sha3 10.2.0]# echo $ORACLE_BASE/u01/app/oracle[root@sha3 10.2.0]# cd $ORACLE_BASE/flash_recovery_area/ora10g/archivelog转移或清除对应的归档日志, 删除一些不用的日期目录的文件，注意保留最后几个文件（比如360以后的）---------------------------------------------------------------------------------------注意:在删除归档日志后，必须用RMAN维护控制文件，否则空间显示仍然不释放。

---------------------------------------------------------------------------------------8. rman target sys/oracle[root@sha3 oracle]# rman target sys/oracleRecovery Manager: Release 10.2.0.4.0 - Production on Tue Jan 20 01:41:26 2009Copyright (c) 1982, 2007, Oracle. All rights reserved.connected to target database: tt (DBID=4147983671)9. 检查一些无用的archivelogRMAN> crosscheck archivelog all;10. 删除过期的归档RMAN> delete expired archivelog all;delete archivelog until time 'sysdate-1' ; 删除截止到前一天的所有archivelog11. 再次查询，发现使用率正常，已经降到23.03SQL> select * from V$FLASH_RECOVERY_AREA_USAGE;FILE_TYPE PERCENT_SPACE_USED PERCENT_SPACE_RECLAIMABLE NUMBER_OF_FILES------------ ------------------ ------------------------- ---------------CONTROLFILE .13 0 1 ONLINELOG 2.93 0 3 ARCHIVELOG 23.03 0 36 BACKUPPIECE 0 0 0 IMAGECOPY 0 0 0 FLASHBACKLOG 0 0 0其它有用的Command:----------------------------------如果archive log模式下不能正常startup,则先恢复成noarchive log,startup成功后，再shutdown; shutdown immediate;startup mount;alter database noarchivelog;alter database open;shutdown immediate;再次startup以archive log模式shutdown immediate;startup mount;show parameter log_archive_dest;alter database archivelog;archive log list;alter database open;如果还不行，则删除一些archlog logSQL> select group#,sequence# from v$log;GROUP# SEQUENCE#---------- ----------1 623 642 63原来是日志组一的一个日志不能归档SQL> alter database clear unarchived logfile group 1;alter database open;最后，也可以指定位置Arch Log, 请按照如下配置select name from v$datafile;alter system set log_archive_dest='/opt/app/oracle/oradata/usagedb/arch' scope=spfile或者修改大小SQL> alter system set db_recovery_file_dest_size=3G scope=both;Informix 数据库：1、查看空间大小onstat –d2、调整空间大小,给数据库datadbs加chunkonspaces -a datadbs -p /home/informix/dbs/datadbs2 -o 0 -s 2000000onspaces -a spacename -p pathname -o offset -s size [-m path offset]onspaces -c spacename [-t] -p pathname -o offset -s size [-m path offset]。