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DB_WRITER_PROCESSES
DB_WRITER_PROCESSES = 2 * number of CPU cores IO快到有空置的時間, 那麼加dbwr便有作用了Multiple DBWR processes is preferred over the use of I/O slaves. I/O slaves should only be used if multiple DBWR ...
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RMAN Image Copy Incremental Updates
Oracle ICIU - Image Copy Incremental UpdatesWith this strategy ,you will never have to apple more than 24 hours of redo/archive logs ( suppose daily backup) to apply to perform. a complete recovery.T...
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iSCSI?
More devices, lower performance request , higher bandwidth (10Gb) ,then more advantage !
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installation steps on centos5
groupadd -g 115 dbagroupadd -g 116 oinstalluseradd -u 175 -g 115 -s /bin/bash -c "Oracle Software Owner" -p pass oraclepasswd oraclemkdir /u01/OraBasemkdir /u01/OraBase/OraHome1mkdir /u01/OraBase/orad...
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one test
一:SQL Tuning 类 1:列举几种表连接方式内部连接（inner join），简称内连，结果即为TA，TB两集合的交集。左部连接（left join），简称左连，A，B左部连接的结果即为TA。右部连接（right join），简称右连...
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comment
USER_COL_COMMENTSALL_COL_COMMENTSDBA_COL_COMMENTSUSER_TAB_COMMENTSALL_TAB_COMMENTSDBA_TAB_COMMENTS
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oracle job
SQL> show parameter jobNAME &nbs...
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Deprecated in Oracle Database 11g Release 2 (11.2) - raw devices
Installing data files directly on raw devices is no longer available during installation with Oracle Universal Installer or Database Configuration Assistant. You must use a file system, or use Automat...
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Normal EM user add job
The owner of the job is not registered ORA-06512: at "SYSMAN.MGMT_JOBS", line 168 ORA-06512: at "SYSMAN.MGMT_JOBS", line 86 ORA-06512: at line 1 login with sysman;execute MGMT_USER.MAKE_EM_USE...
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flashback database
SQL> select trans_id,store_id from trans where trans_id=1085; TRANS_ID STORE_ID---------- ---------- 1085 ...
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flashback table
SQL> alter table trans enable row movement; SQL> select trans_id,store_id from trans where trans_id=1085; TRANS_ID STORE_ID---------- ---------- &...
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testdata
CREATE TABLE trans( trans_id number, cust_name varchar2 (20), trans_dt date, trans_amt numbe...
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where is the hot ?
SELECT * FROM ( SELECT addr, ts#...
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GetSQL
SELECT &...
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PGA optimal onepass multipass
/* Formatted on 2010/1/8 18:34:37 (QP5 v5.114.809.3010) */SELECT NAME, VALUE, 100  ...
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EM Grid Control Agent Target Discovery
[oracle@hzsdb2 bin]$ ./agentca -helpUsage: agentca -d/-f [-nctis] -d option for rediscovery. -f opti...
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Clone ORACLE_HOME
1, Clean up OraHome1 for OraHome1.tar.gz $ORACLE_HOME/<Hostname>_<SID>$ORACLE_HOME/oc4j/j2ee/OC4J_DBConsole_<Hostname>_<SID>$ORACLE_HOME/network/log/$ORACLE_HOME/network/a...
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ncompress-4.2.4-44.rhel4.x86_64
Cloning of an Oracle Home via Grid Control fails with "/usr/bin/compress: Command not found." [ID 566370.1]
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EMGC Bug 5899294
Problem: OMS Cannot Communicate with Agent if IP Address of the Grid Agent Machine is Changed [ID 605009.1] http://forums.oracle.com/forums/thread.jspa?threadID=924925&tstart=15
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COMMIT OPTION
COMMIT WAIT: The commit does not return as successful until the redo corresponding to the commit is persisted in the online redo logs (default).COMMIT NOWAIT: The commit should return to the applica...
