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(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
Tags: style color io using AR strong for file dataInventory Oracle Installation Tool OUI to manage the Oracle installation directory Oracle's parameter file , starting after the parameter file is read in the following order, if the read fails, start the database failure:1 $ORACLE _home/dbs/spfile. ORA2 $ORACLE _home/db
dynamic adjustment of the SGA area; SQL>show SGA; network connection--Session processes;Sql> SelectUsername,paddr fromV$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
Oracle cluster and cluster tables, Oracle cluster tables Oracle clusters and cluster tables A cluster consists of multiple tables that share the same data block. It stores the related r
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
########## Managing Tables ############/* char type maxlen = 2000; varchar2 type maxlen = 4000 bytesrowid is an 18-bit 64-digit string (10 bytes 80 bits) consisting of rowids: Object # (object number) -- 32 bits, 6-bit rfile # (relative file number) -- 10 bits, 3-bit block # (block number) -- 22 Bits, 6-bit row # (row number) -- 16 bits, 3-bit 64-hexadecimal: A-Z, A-Z, 0-9,/, + A total of 64 symbols in the dbms_rowid package can provide the interpreta
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
The Oracle 11g R2 DBA Operations Guide was the first book I learned about Oracle database knowledge, where I recorded my own learning notes, and I verified the knowledge points in the book by actual operation.1.Oracle Database Foundation 1.1. relational database 1.1.1. relational Database model 1. relational Database
resource_limit=true;The Nineth chapter: User Management1.create a user:database authenticationSql> create user Juncky identified by Oracle default Tablespace usersSql> Temporary tablespace temp quota 10m on data password expiresql> [Account Lock|unlock] [profile Profilename|default];2.change User quota on Tablespacesql> ALTER user juncky quota 0 on users;3.drop a usersql> drop User Juncky [cascade];4. Monitor UserView:dba_users, Dba_ts_quotasTenth ch
tablespace users quota 10M on users; B, change the password Alter user username identified by pass; The password is changed from password to pass, the same login after the input password can also change the password C, delete users Drop user username; Drop user username cascade; 5, three standard roles (role): CONNECT, Resource, and DBA. I, connect connection, login permission II. Resource can create tables
Oracle pagination for tables without primary keys and Oracle primary key tables Generally, for tables with a primary key that can be used for unique table recognition, we can use the primary key and rownum for implementation. For example: Select scott. emp. * from scott.
Prerequisites:Field ID and name in table Info_user, field ID is indexedField ID and name in table Data_user_info, field ID is indexedThe field ID in table Info_user is the same as the field ID value in table data_user_info.Required implementations:The field name in Update table Info_user is the same as the field name in Table Data_user_info.The SQL statements implemented are:Update Info_user I set (i.name) = (select D.name from Data_user_info d where d.id = I.id)where i.id = (select D.id from Da
tablespaces the SCOTT user uses select T.table_name, T.tablespace_namefrom dba_all_tables twhere t.owner = ' SCOTT '; 14. View Current user-owned permissions select T.privilege from Session_privs t; Sql> Select T.privilege from Session_privs t; PRIVILEGE----------------------------------------CREATE sessionunlimited tablespacecreate tablecreate Clustercreate viewcreate sequencecreate procedurecreate triggercreate typecreate OPERATORCREATE indextype 11 rows have been selected. 14. View role (
tablespace users quota 10M on users;B, change the passwordAlter user username identified by pass;The password is changed from password to pass, the same login after the input password can also change the passwordC, delete usersDrop user username;Drop user username cascade;5, three standard roles (role): CONNECT, Resource, and DBA.I, connect connection, login permissionII. Resource can create tables, sequences, procedures (procedure), triggers (trigge
Tags: Oracle DBA stress testThis article is original article, reprint please indicate source: http://blog.csdn.net/msdnchina/article/details/42376661Before a business system stress test, an Oracle DBA is required to do the work ahead of time:1. If the Oracle database softwar
statistics, calculate */select count (*) from ScheMa.tablename; --Statistics out the total number of rows in the table select DISTINCT (ind_row) from Schema.tablename; --the distinct value of the column in which the index is counted--is then calculated purely by hand?/* Query waits for events */select event, sum (Decode (wait_time, 0, 1, 0)) "Current Wait", Sum (Decode (wai T_time, 0, 0, 1)) "Not currently waiting", COUNT (*) "Total" from v$session_wait GROUP by event ORDER by Count (*) desc;
This is a sophomore writing in the QQ space in an article, I remember that the problem took me the whole day to fix it, so experienced quite deep, so at that time deliberately recorded the process of the settlement, and today suddenly have the interest to find out a few college writing in the spaces in the article and share with you, In case something like that happened to me, it would take a lot of time, and the following is the full contents of the record:Today login with the user Scott landed
Differences between temporary tables in Oracle and temporary tables in SQL Server compared with the process of creating temporary tables in Oracle databases and the differences between temporary tables in SQL Server are the main c
Differences between Oracle temporary tables and SQL Server temporary tables: The process of creating a temporary table in the Oracle database and the difference between the temporary table and the SQL Server are described in this article, next, let's take a look at this part of content, hoping to help you. 1. Introduct
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