Oracle

INDEX FAST FULL SCAN AND SKIP SCANWhen quickly scanning an index, oracle reads all leaf node blocks of the B-tree index in sequence and can read db_file_multiblock_read_count at the same time,In addition, quick indexing is much smaller than full

Note: 1. if you open it in PL/SQL or other tools, directly modify the [italic bold Section] in the following code and execute 2. make sure that the path exists. For example, [D: \ oracle \ oradata \ Oracle9i \] means that the path of the file to be

10g rac asm modify IP address first, yesterday set up a set of full raw (including crs and voting disks and database files) 10.2.0.1RAC (not Using asm, the title is written in asm and is used by many comrades. I can modify the method here.) to test

Oracle 10g rac deployment documentation host network configuration considerations: static IP Address Configuration: static gateway should specify hostname not to appear in the loopback address! If you have started the single-host asm service, stop --

Oracle Bug 6136074-ORA-04068/ORA-04065/ORA-06508 addressed on 10.2.0.3, where a bug may cause compilation or view failure, and the Failure result is not just that the current view or process is not available, instead, the entire data dictionary may

Example code [SQL] create smallfile tablespace "newts" datafile 'd: \ app \ oracle \ oradata \ orcl11g \ newts01.dbf 'size 100 m autoextend on next 10 m maxsize 200 m logging/* all operations on segments in the tablespace will generate redo content,

How to Create a sequence in Oracle sequence is the so-called serial number, which is automatically increased each time it is obtained. It is generally used in places where the sequence number needs to be sorted. 1. Create Sequence you must first

RHEL6 uses udev to modify the asm disk name. The current system uses emc power Multi-path software, and the disk name changes after the restart. to standardize the use of the asm disk, you need to use udev to fix the disk name. The specific steps

Routine knowledge of Oracle Database Maintenance-1. check the idle tablespace of the database. The CHUNKS column indicates the number of available idle blocks in the tablespace (each idle block is composed of several consecutive Oracle data blocks).

The Oracle db_file_mulitblock_read_count parameter Oracle DB_FILE_MULTIBLOCK_READ_COUNT is an important global parameter in Oracle, which can affect the system level and sessioin level. It is mainly used to minimize the number of data blocks that

The structure and execution sequence of select statements. The following sequence numbers represent the execution sequence 8 select (9) DISTINCT 11 1 ROM 3 JOIN 2 ON 4 WHERE 5 group by 6 {CUBE | ROLLUP} 7 HAVING 10 order by additional

Undofile fault recovery test table: SQL> select count (*) from t1; COUNT (*) ------------------ 100958 event simulation: SQL> insert into t1 select * from dba_objects; 50479 rows created. simulate Data File Corruption rollback: SQL>! Oracle @

[Oracle] Data Guard-three Protection modes Data Guard provides the following three Data Protection modes: 1) Maximum Protection) the "maximum protection" here refers to protecting data from loss to the maximum extent, that is, at least one standby

Group by: group by (EXPRESSION) You can use the group by clause to divide a table into smaller groups. Note: 1. all columns or expressions in the selelct list must appear in the group by clause or group function, but the group by clause can contain

[Oracle]-[EM]-solve the problem that EM cannot be opened for a long time and it has not been opened yet. This error occurs today: SQL> select username, account_status from dba_users; USERNAME ACCOUNT_STATUS extends outln opensys opensystem

You can use datapump to export and import Synonyms (export and import synonym using datapump) to back up synonyms in multiple ways. For example, you can directly generate a synonym creation script using a script, you can also use

Oracle rman local connection: $ rman target/or $ rman target/nocatalog remote connection: $ rman target sys/sys @ skyRMAN command execution method: 1. single command execution 2. run {} 3. script Execution rman target/@ XXXX. rmanrman

Select... in oracle... connect by prior... start with and (+) usage 1. select... connect by prior... usage of start with: select... from where -- filter condition, used to filter all returned records start with -- query results from the start of

Oracle trigger: view, schema, database view trigger, instead of we know that if a view is only composed of a table, there are not many restrictions on the operations on The view. if the view is composed of multiple tables, the unpdate, insert, and

Oracle FAQ 1. oracleDBConsoleorcl cannot start error code 2: solution: Enter emctl start dbconsole in the command line to report an error. ORACLE_SID does not define the input set ORACLE_SID = ORCL (ORCL is my Instance name and service name) no