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recovery area sql> select sum (percent_space_used) *3/100 from V$flash_recovery_area_usage; SUM (percent_space_used) *3/100 ----------------------------- 2.9904 6. Find recovery directory, show parameter recover Sql> show parameter recover; NAME TYPE VALUE ------------------------------------ ----------- ------------------------------ Db_recovery_file_dest String/u01/app/oracle/flash_recovery_area Db_recovery_file_dest_size Big Integer 5G Recovery

Nocatalog way: With control file as a catalog, every backup to the controlling files to write a lot of backup information, control files will have more and more backup information, that is, Rman backup information written in the local control file inside. Catalog way: You must first create a directory backup database (catalog, also known as the Knowledge Base), set up a recovery directory, that is, the dat

Tags: convenient variable fixed select data type audio oracl ACL viewRecently in the Data Warehouse, because some of the almost fixed value of the table, need to write some data directly, read some information. It is found that many are from dual.What is dual?Dual is a pseudo-table in Oracle that can be used to set or

create sequence name Increment Span style= "COLOR: #0000ff" >by x // x for Growth interval Start with x // x is the initial value MaxValue x // x MinValue x // x is the lowest value CYCL E // cyclic use, when reaching the maximum or minimum, from the new build object CA Che x // set the number of cached (that is, memory) sequence values A sequence

Tags: mode options process Database create database no memory read oneWhat is the difference between startup Nomount and startup Mount in Oracle startup?Answer: Startup Nomount: Launch instance, read parameter file, allocate memory space, start background process, open trace file and alarm file. Startup mount: Mount the database and open the control file. The Nomount mode has not yet read the control file,

Dual is a virtual table that forms the grammar rules for Select, and Oracle guarantees that there will always be a single record in dual. We can use it to do a lot of things as follows: 1, view the current user, you can execute the following statement in SQL Plus SQL codeSelect User from Dual; 2, used to call the system function SQL codeSelect To_char (sysdate, ' Yyyy-mm-dd hh24:mi:ss ') from dual;--to