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Introduce the 'force' option for the Drop Database command.

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This new option terminates the other sessions connected to the target
database and then drop it.  To terminate other sessions, the current user
must have desired permissions (same as pg_terminate_backend()).  We don't
allow to terminate the sessions if prepared transactions, active logical
replication slots or subscriptions are present in the target database.

Author: Pavel Stehule with changes by me
Reviewed-by: Dilip Kumar, Vignesh C, Ibrar Ahmed, Anthony Nowocien,
Ryan Lambert and Amit Kapila
Discussion: https://postgr.es/m/CAP_rwwmLJJbn70vLOZFpxGw3XD7nLB_7+NKz46H5EOO2k5H7OQ@mail.gmail.com
This commit is contained in:
Amit Kapila
2019-11-12 11:06:13 +05:30
parent 112caf9039
commit 1379fd537f
13 changed files with 248 additions and 14 deletions
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43
src/backend/parser/gram.y
View File

@ -310,6 +310,7 @@ static Node *makeRecursiveViewSelect(char *relname, List *aliases, Node *query);
%type <defelt> vac_analyze_option_elem
%type <list> vac_analyze_option_list
%type <node> vac_analyze_option_arg
%type <defelt> drop_option
%type <boolean> opt_or_replace
opt_grant_grant_option opt_grant_admin_option
opt_nowait opt_if_exists opt_with_data
@ -406,6 +407,7 @@ static Node *makeRecursiveViewSelect(char *relname, List *aliases, Node *query);
TriggerTransitions TriggerReferencing
publication_name_list
vacuum_relation_list opt_vacuum_relation_list
drop_option_list
%type <list> group_by_list
%type <node> group_by_item empty_grouping_set rollup_clause cube_clause
@ -10213,7 +10215,7 @@ AlterDatabaseSetStmt:
/*****************************************************************************
*
* DROP DATABASE [ IF EXISTS ]
* DROP DATABASE [ IF EXISTS ] dbname [ [ WITH ] ( options ) ]
*
* This is implicitly CASCADE, no need for drop behavior
*****************************************************************************/
@ -10223,6 +10225,7 @@ DropdbStmt: DROP DATABASE database_name
DropdbStmt *n = makeNode(DropdbStmt);
n->dbname = $3;
n->missing_ok = false;
n->options = NULL;
$$ = (Node *)n;
}
| DROP DATABASE IF_P EXISTS database_name
@ -10230,10 +10233,48 @@ DropdbStmt: DROP DATABASE database_name
DropdbStmt *n = makeNode(DropdbStmt);
n->dbname = $5;
n->missing_ok = true;
n->options = NULL;
$$ = (Node *)n;
}
| DROP DATABASE database_name opt_with '(' drop_option_list ')'
{
DropdbStmt *n = makeNode(DropdbStmt);
n->dbname = $3;
n->missing_ok = false;
n->options = $6;
$$ = (Node *)n;
}
| DROP DATABASE IF_P EXISTS database_name opt_with '(' drop_option_list ')'
{
DropdbStmt *n = makeNode(DropdbStmt);
n->dbname = $5;
n->missing_ok = true;
n->options = $8;
$$ = (Node *)n;
}
;
drop_option_list:
drop_option
{
$$ = list_make1((Node *) $1);
}
| drop_option_list ',' drop_option
{
$$ = lappend($1, (Node *) $3);
}
;
/*
* Currently only the FORCE option is supported, but the syntax is designed
* to be extensible so that we can add more options in the future if required.
*/
drop_option:
FORCE
{
$$ = makeDefElem("force", NULL, @1);
}
;
/*****************************************************************************
*