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XPROCESSES) + 5 By default, this parameter is automatically calculated and takes effect when PROCESSES is modified. 2. Operating System Dependent Parameters The valid values or value ranges of some parameters depend on or are limited by the operating system, such as the db_cache_size parameter, which sets the memory size used by Oracle. The maximum value of this parameter is limited by the physical memory. This type of parameter is generally not cal

normally and all types of databases are in normal state. 2. Check whether the hard disk space is sufficient. 3. view database logs, trace files, and check for errors 4. Check the backup validity. 5. Monitor the server performance parameters through the system performance monitor to find out whether the database performance is degraded, find the cause and solve the problem. 6. Enter the DBA log Weekly work: 1. Monitor the space expansion of database o

Oracle knowledge sorting DBA thoughts and skiesThe Inventory Oracle Installation Tool OUI is used to manage the Oracle parameter files in the Oracle installation directory. After startup, it reads the parameter files in the following order. If reading fails, it fails to star

Oracle dba Pen TestOne: SQL tuning class 1: Enumerate several table connection ways2: How to view SQL execution plan without the help of Third-party tools3: How to use the difference between CBO,CBO and rule4: How to locate the SQL that is important (consumes a lot of resources)5: How to track the SQL of a sessionWhat is the most concerned about 6:sql adjustment7: Talk about your knowledge of indexes (struc

monitoring is necessary 207Thinking on the construction of 6.7 operation and maintenance platform--meta data management 2096.8 Monitoring blind spots and diagnostic cases 210Monitoring blind spots: A potential monitoring problem caused by dual 210Diagnostic Case: Standby CPU Usage Exception Optimization 213Diagnostic Case: Two alarm information combined with analysis of DG Problem 216Diagnostic case: Monitoring anti-monitoring error--an analysis of a Orabbix alarm 222Diagnostic case: Customizin

ORACLE DBA face Test setOne: SQL tuning class1 Enumerate several table connection wayssuch as connection, non-equal connection, self connection, outer connection (left, right, full)2 How to view SQL execution plan without the help of a third-party tool(I) Use explain plan to query plan_table;EXPLAIN PlanSET statement_id= ' QUERY1 'ForSELECT *From aWHERE aa=1;SELECT operation, Options, object_name, object_ty

oracle| Script In a longer period of interaction with Oracle, each DBA, especially some heroes have a variety of scripting tools to complete a variety of purposes, so very convenient and quick to complete the day-to-day work, the following part of my commonly used to show you, this article mainly focused on database management, these scripts have been rigorously

solution　　(3). Seek opportunities for database performance Adjustment　　Compare daily monitoring reports on database performance to determine whether it is necessary to adjust database performance　　(4). database performance Adjustment　　Adjust the performance if necessary　　(5) propose the next space management plan　　Based on weekly monitoring, this paper proposes an improvement method for space management.　　Routine Oracle

Oracle DBA Database Senior Engineer Training Package (series more than 60 sets + seven phases + thousands of cases)DescribeOracle DBA Database Senior Engineer Training course is the wind brother alone research and development of the fine combat courses, the road map is mainly to let everyone fast employment, high-paying employment. The course content is based on

previous: oracle DBA Study Notes-control files RedoLog Files Redo log files record the changes made to the database (or changes to transactions) in the form of redo records, including the execution of DMLOrDDLStatement modification to the database,It also includesDBAModify the database structure,Redo log files also need to be reused. Log File writing principles:1.Write order must strictly fol

========================================================== ============================######### Create a database ---- look $ ORACLE_HOME/rdbms/admin/buildall. SQL ############ CREATE DATABASE db01maxlogfiles 10 maxdatafiles 1024 maxinstances 2 logfilegroup 1 ('/u01/oradata/db01/log_01_db01.rdo') size 15 m, group 2 ('/u01/oradata/db01/log_02_db01.rdo') size 15 m, group 3 ('/u01/oradata/db01/log_03_db01.rdo') size 15 m, datafile 'u01/oradata/db01/system_01_db01.dbf') size 100 m, undo tablespace

A lot of the time, do Oracle DBA us, when the application administrator to inform us that the application is now slow, the database is very slow, when we go to the database to do a few examples of select also found the same problem, sometimes we can not start, Because we believe that the various life rates of the database are recommendations for meeting Oracle do

depends on whether you want to be a DBA or a developer? The certificate is sure to be taken, just like having a driver's license to drive a car. Second, there are teachers to get you started. Entering the industry will be quick, otherwise it is difficult to enter the industry role. If you have a friend who knows best, if not, it is also a good choice to attend the training. Choose a company with real training technology is the best, of course, our cen

This article mainly introducesOracle 10g isqlplusUseDBA accountNext, we will introduce them one by one. 1. vi. bash_profile Add Environment Variables exportJAVA_HOME=$ORACLE_HOME/jdk Save and exit. source.bash_profile 2. Switch to the correct directory cd$ORACLE_HOME/oc4j/j2ee/isqlplus/application-deployments/isqlplus 3. Run the JAZN shell. $JAVA_HOME/bin/java-Djava.security.properties=$ORACLE_HOME/sqlplus/admin/iplus/provider -jar$ORACLE_HOME/oc4j/j2ee/hom

Oracle Learning (18) [DBA]: Distributed DatabaseWhat is a distributed database? L data is physically stored on multiple nodes of the network, logically being a whole.The independence of distributed databases l the independence of distributed data means that users do not have to worry about how data is divided and stored, but only what data they need.Oracle distributed RDBMS local operations remote operation

As an Oracle DBA, a number of problems with character sets are frequently dealt with at work. But when you really want to write something about it, you suddenly don't have a clue. After a half-day, or decided to use the two character set as an example of the point of entry, it is a clue, perhaps in the course of the experiment, the problem will emerge one after another. Now, let's cut to the chase. The da

(nomount); 2. Mount the database (Mount); 3. Open the database (open) 1. Start and instance In nomount, Oracle starts an instance and reads the specified initial parameter values in the spfile or pfile parameter file. Allocate the SGA shared memory area and create background processes. You can use the restrict and force options to enable instances. In restrict mode, only DBA is allowed to do the follow

What should I know first as an Oracle DBA in a completely new environment?Here, we will not talk about those major aspects, such as understanding the overall situation of the entire IT environment. If you already know this, you need to face these living databases. here we have summarized some general ideas to face a database first, so as to quickly understand the environment overview you are facing. This i

Oracle DBA Database Senior Engineer Training Upper (project implementation + Backup Recovery + foundation depth)Purchase Address:Http://edu.51cto.com/pack/view/id-739.html DescribeOracle DBA Database Senior Engineer Training course is the wind brother alone research and development of the fine combat courses, the road map is mainly to let everyone fast employ

dynamic adjustment of the SGA area; SQL>show SGA; network connection--Session processes;Sql> SelectUsername,paddr fromV$sessionwhereUsername is not NULL; USERNAME paddr------------------------------ ----------------SYS 00000000f04dae60sys 00000000f04dae60c# #SCOTT 00000000f04dbea0SelectAddr fromV$processwhereBackground is NULL andAddr='00000000f04dae60';Select * fromV$processwhereBackground is NULL andAddr='00000000f04dae60';SetAutotrace onStat;SelectUsername,paddr fromV$sessionwhereUsernam