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Oracle: Temporary segment

Temporary segments are needed for operations involving

sorts
hashing
bitmap merging

Temporary segments are also used/created by the following SQL statements

create table as select
alter index rebuild
create index
drop table / drop object (which converts the segment into a temporary segment which is then cleaned up later(?) by SMON?)
create snapshot
create partition table

SMON cleans temporary segments up:

in temporary tablespaces when the database is started up
in permanent tablespaces when the user process has died before it can clean up the segment.

Fatal error: Uncaught PDOException: SQLSTATE[HY000]: General error: 8 attempt to write a readonly database in /home/httpd/vhosts/renenyffenegger.ch/php/web-request-database.php:78 Stack trace: #0 /home/httpd/vhosts/renenyffenegger.ch/php/web-request-database.php(78): PDOStatement->execute(Array) #1 /home/httpd/vhosts/renenyffenegger.ch/php/web-request-database.php(30): insert_webrequest_('/notes/developm...', 1758204814, '216.73.216.150', 'Mozilla/5.0 App...', NULL) #2 /home/httpd/vhosts/renenyffenegger.ch/httpsdocs/notes/development/databases/Oracle/architecture/database/logical-structures/segment/temporary(60): insert_webrequest() #3 {main} thrown in /home/httpd/vhosts/renenyffenegger.ch/php/web-request-database.php on line 78

Oracle: Temporary segment

See also