In the morning to connect to Oracle, oracle can not work normally, can not shutdown immediate Mode to close, shutdown abort mode to close and then start, the error message "ORA-03113 end-of-file on communication channel" appears"The alter log information is analyzed as follows:Errors in file/u01/diag/rdbms/online/trace/online_ora_1544.trc:ORA-19815: Warning: db_r
Oracle performance optimization and oracle database performance optimization
(1)Select the most efficient table name sequence (valid only in the rule-based Optimizer ):The ORACLE parser processes the table names in the FROM clause in the order FROM right to left. The table written in the FROM clause (basic table driving table) will be processed first, when the FR
here. Also, careful readers should find out that I am a very careful person, my control files are in two copies. In this case, if one of my control files is accidentally deleted or damaged, I have another control file to ensure the normal operation and startup of my database (I accidentally introduced the multiplexing technology in advance ...... More detailed configuration and resolution will be provided later ).I want to go into details about the role of control files? As many as 90 years old
With the upgrade of the Oracle version, RMAN is also enhanced. RMAN in Oracle11g supports the use of different operating systems and different databases. For the compatibility of RMAN, refer:
Oracle RMAN compatibility and FAQs between different versions and different platforms
This article demonstrates an example of restoring 10 Gb to 11 GB in linux.
Target end:
OS: Ora
ORA-00604 error occurred at recursive SQL level string
Cause: An error occurred while processing a recursive SQL statement (a statement applying to internal dictionary tables ).
Action: If the situation described in the next error on the stack can be corrected, do so; otherwise contact Oracle customer support.
ORA-00604: An error occurred while recursion a SQL Layer
Cause: an error occurs when you run a recursive SQL statement that applies to operatio
Resume oracle.sh in/etc/profile.d/
The contents are as follows in Nls_lang setup encoding
1 oracle_home=/usr/lib/oracle/12.1/client642 c_include_path=/usr/include/ oracle/12.1/client643 ld_library_path= $ORACLE _home/lib4# RememberThis was the client Nls_lang not the server one5 nls_lang=6 Export Oracle_ho ME Ld_library_path Nls_lang
Then modify the/ETC/INIT.D
, starting at m and intercepting N characters consecutively.---need to note: The database subscript is starting from 1!!!---n is truncated to the end of the current string if the number that is not specified or specified exceeds the actual character length that can be intercepted. n is the length.---if M is negative, it is intercepted from the countdown position. The number at the end cannot be negative.SELECT SUBSTR (' thinking in from dual;--->inSELECT SUBSTR (' thinking in from dual;--->in---
Label:I. CentOS on-Build installation Bbed tool[Email protected] ~]$ CD $ORACLE _home/rdbms/Lib[[email protected]~]$ make-f ins_rdbms.mk $ORACLE _home/rdbms/lib/bbed can also generate bbed to $oracle_home with the following command/bin directory [[email protected]~]$ make-f ins_rdbms.mk bbed= $
Source backup, run the utluw. I. SQL script. If the script is not executed, run @? The following error is reported during/rdbms/admin/catupgrd. SQL script:
DOC> The following error is generated if the pre-upgrade tool has not been
DOC> run in the old ORACLE_HOME home prior to upgrading a pre-11.2 database:
DOC>
DOC> SELECT TO_NUMBER ('ust _ HAVE_RUN_PRE-UPGRADE_TOOL_FOR_TIMEZONE ')
DOC> *
DOC> ERROR at line 1:
DOC> ORA-01722: invalid number
DOC>
DO
Tags: oracle instanceThinking back just entered the job, a server was hung up, so is in "distress" have the opportunity to learn. In the dead of night, I want to recall the creation of an Oracle instance. One method, DBCA, a graphical interface, but relies on software such as Xming or Xmanager, and the other is scripting Oracle DB instances. The first method is s
the following physical Memory requirements:Minimum:1 GB of RAMRecommended:2 GB of RAM or moreB.) Swap disk space proportional to the system ' s physical memory as follows:
Ram
Swap Space
Between 1 GB and 2 GB
1.5 times the size of RAM
Between 2 GB and GB
Equal to the size of RAM
More than GB
+ GB
Note: The above recommendations (from the Oracle? Database Insta
Tags: library sel shutdown struct parallel number serve log file capOracle Servers (Oracle server) are comprised of instances and databases. The example is the so-called Relational database management system (relational Management System,rdbms), which is used to provide relevant database management functions, and the database is composed of Oracle database files,
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