Linux and UNIX Man Pages

Linux & Unix Commands - Search Man Pages

discard(7) [centos man page]

DISCARD(7)						  PostgreSQL 9.2.7 Documentation						DISCARD(7)

NAME
DISCARD - discard session state SYNOPSIS
DISCARD { ALL | PLANS | TEMPORARY | TEMP } DESCRIPTION
DISCARD releases internal resources associated with a database session. These resources are normally released at the end of the session. DISCARD TEMP drops all temporary tables created in the current session. DISCARD PLANS releases all internally cached query plans. DISCARD ALL resets a session to its original state, discarding temporary resources and resetting session-local configuration changes. PARAMETERS
TEMPORARY or TEMP Drops all temporary tables created in the current session. PLANS Releases all cached query plans. ALL Releases all temporary resources associated with the current session and resets the session to its initial state. Currently, this has the same effect as executing the following sequence of statements: SET SESSION AUTHORIZATION DEFAULT; RESET ALL; DEALLOCATE ALL; CLOSE ALL; UNLISTEN *; SELECT pg_advisory_unlock_all(); DISCARD PLANS; DISCARD TEMP; NOTES
DISCARD ALL cannot be executed inside a transaction block. COMPATIBILITY
DISCARD is a PostgreSQL extension. PostgreSQL 9.2.7 2014-02-17 DISCARD(7)

Check Out this Related Man Page

SET SESSION 
AUTHORIZATION(7) SQL Commands SET SESSION AUTHORIZATION(7) NAME
SET SESSION AUTHORIZATION - set the session user identifier and the current user identifier of the current session SYNOPSIS
SET [ SESSION | LOCAL ] SESSION AUTHORIZATION username SET [ SESSION | LOCAL ] SESSION AUTHORIZATION DEFAULT RESET SESSION AUTHORIZATION DESCRIPTION
This command sets the session user identifier and the current user identifier of the current SQL-session context to be username. The user name may be written as either an identifier or a string literal. The session user identifier is valid for the duration of a connection; for example, it is possible to temporarily become an unprivileged user and later switch back to become a superuser. The session user identifier is initially set to be the (possibly authenticated) user name provided by the client. The current user identi- fier is normally equal to the session user identifier, but may change temporarily in the context of ``setuid'' functions and similar mecha- nisms. The current user identifier is relevant for permission checking. The session user identifier may be changed only if the initial session user (the authenticated user) had the superuser privilege. Other- wise, the command is accepted only if it specifies the authenticated user name. The SESSION and LOCAL modifiers act the same as for the regular SET [set(7)] command. The DEFAULT and RESET forms reset the session and current user identifiers to be the originally authenticated user name. These forms are always accepted. EXAMPLES
SELECT SESSION_USER, CURRENT_USER; current_user | session_user --------------+-------------- peter | peter SET SESSION AUTHORIZATION 'paul'; SELECT SESSION_USER, CURRENT_USER; current_user | session_user --------------+-------------- paul | paul COMPATIBILITY
SQL99 SQL99 allows some other expressions to appear in place of the literal username which are not important in practice. PostgreSQL allows iden- tifier syntax ("username"), which SQL does not. SQL does not allow this command during a transaction; PostgreSQL does not make this restriction because there is no reason to. The privileges necessary to execute this command are left implementation-defined by the stan- dard. SQL - Language Statements 2001-04-21 SET SESSION AUTHORIZATION(7)
Man Page

9 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

How to turn off "discard RIP response" message

I am running a solaris 10 box and is just a workstation. I want to turn off the message below since it is annoying me. Nov 15 12:16:07 stage5 in.routed: discard RIP response; source 134.56.105.2 not on interface eri0 This message only pops up when I am in a console. Telnet doesn't see it. ... (2 Replies)
Discussion started by: tecky
2 Replies

2. Programming

how to discard instruction from previous signal

hello everyone, I'm having a problem doing signal handling so I post this thread to see if I could get help. I want asynchronous signal handling, that means when I'm processing a signal (signal 1), if the same signal comes (signal 2) that signal (signal 2) shall be processed; and moreover,... (7 Replies)
Discussion started by: nvhoang
7 Replies

3. Shell Programming and Scripting

Outputting discarded GREP lines to a file

I had a question about grep. If I grep for something in a file, the output shows me all the lines in which that 'something' is contained in. Is there a way to also output all the lines in which that 'something' wasnt contained in. Say I have a file with a bunch of names and I do: grep scott... (2 Replies)
Discussion started by: ndedhia1
2 Replies

4. Shell Programming and Scripting

sed discard chars after last _

Hi, I'd get fields like unix_linux_form_yyyyddmmhhmi.file.txt shell_programming_and_scripting.txt so on... and want them as below unix_linux_form shell_programming_and I could remove everything after a '.' as below echo $field | sed 's/\..*//' but how to remove... (14 Replies)
Discussion started by: dips_ag
14 Replies

5. Shell Programming and Scripting

how to find pattern and discard lines before it?

Hi all, I'd like to search a file for the first occurence of the phrase "PLASTICS THAT EXPIRE" and then discard all the lines that came before it. Output the remainder to a new file. Operating system is hp-ux. I've searched for usual awk and sed one liners but can't find a solution. Thank... (4 Replies)
Discussion started by: Scottie1954
4 Replies

6. Shell Programming and Scripting

Number some lines discard others?

Hi, I'd like to do an operation on text with a format like this this line shall be numbered this line shall not be numbered this line shall also be numbered this line shall not not be numbered And I want an output like this 1 this line shall be numbered this line... (6 Replies)
Discussion started by: jeppe83
6 Replies

7. Shell Programming and Scripting

Renaming multiple files at once (discarding suffix of the filename after a character)

Hi, I have a lot of files similar to the below order. I want to rename all the files .discrading the time stamp/numbers after cnf. Existing files id_info_20130405.cnf_20130801 in_info_20130405.cnf_20130891 iz_info_20130405.cnf_20130821 in_info_20130405.cnf_20130818... (2 Replies)
Discussion started by: saravanapandi
2 Replies

8. Shell Programming and Scripting

Discard part of a file based on a pattern ---

I have the file: s3_T0(2) Pos "1" "2" s1_T1(2) Pos "1" "2" --- 0 0 1 0 0 1 1 1 --- 1 2 "tau0" 1 2 "h10" I want to patternmatch on --- and get only the third part i.e. 1 2 "tau0" 1 2 "h10" I wanted to start simple but even something like (5 Replies)
Discussion started by: eagle_fly
5 Replies

9. UNIX for Dummies Questions & Answers

Crunch character combination and discard similar content

Hi guys ! I generated the power set of the set S={a,b,c} using crunch: crunch 1 3 abc and get the 39 possible subsets: a b c aa ab ac ba bb bc ca cb cc … (2 Replies)
Discussion started by: beca123456
2 Replies

Featured Tech Videos