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+'\" t
+.\"     Title: DROP INDEX
+.\"    Author: The PostgreSQL Global Development Group
+.\" Generator: DocBook XSL Stylesheets v1.79.1 <http://docbook.sf.net/>
+.\"      Date: 2021
+.\"    Manual: PostgreSQL 13.4 Documentation
+.\"    Source: PostgreSQL 13.4
+.\"  Language: English
+.\"
+.TH "DROP INDEX" "7" "2021" "PostgreSQL 13.4" "PostgreSQL 13.4 Documentation"
+.\" -----------------------------------------------------------------
+.\" * Define some portability stuff
+.\" -----------------------------------------------------------------
+.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+.\" http://bugs.debian.org/507673
+.\" http://lists.gnu.org/archive/html/groff/2009-02/msg00013.html
+.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+.ie \n(.g .ds Aq \(aq
+.el       .ds Aq '
+.\" -----------------------------------------------------------------
+.\" * set default formatting
+.\" -----------------------------------------------------------------
+.\" disable hyphenation
+.nh
+.\" disable justification (adjust text to left margin only)
+.ad l
+.\" -----------------------------------------------------------------
+.\" * MAIN CONTENT STARTS HERE *
+.\" -----------------------------------------------------------------
+.SH "NAME"
+DROP_INDEX \- remove an index
+.SH "SYNOPSIS"
+.sp
+.nf
+DROP INDEX [ CONCURRENTLY ] [ IF EXISTS ] \fIname\fR [, \&.\&.\&.] [ CASCADE | RESTRICT ]
+.fi
+.SH "DESCRIPTION"
+.PP
+\fBDROP INDEX\fR
+drops an existing index from the database system\&. To execute this command you must be the owner of the index\&.
+.SH "PARAMETERS"
+.PP
+CONCURRENTLY
+.RS 4
+Drop the index without locking out concurrent selects, inserts, updates, and deletes on the index\*(Aqs table\&. A normal
+\fBDROP INDEX\fR
+acquires an
+ACCESS EXCLUSIVE
+lock on the table, blocking other accesses until the index drop can be completed\&. With this option, the command instead waits until conflicting transactions have completed\&.
+.sp
+There are several caveats to be aware of when using this option\&. Only one index name can be specified, and the
+CASCADE
+option is not supported\&. (Thus, an index that supports a
+UNIQUE
+or
+PRIMARY KEY
+constraint cannot be dropped this way\&.) Also, regular
+\fBDROP INDEX\fR
+commands can be performed within a transaction block, but
+\fBDROP INDEX CONCURRENTLY\fR
+cannot\&. Lastly, indexes on partitioned tables cannot be dropped using this option\&.
+.sp
+For temporary tables,
+\fBDROP INDEX\fR
+is always non\-concurrent, as no other session can access them, and non\-concurrent index drop is cheaper\&.
+.RE
+.PP
+IF EXISTS
+.RS 4
+Do not throw an error if the index does not exist\&. A notice is issued in this case\&.
+.RE
+.PP
+\fIname\fR
+.RS 4
+The name (optionally schema\-qualified) of an index to remove\&.
+.RE
+.PP
+CASCADE
+.RS 4
+Automatically drop objects that depend on the index, and in turn all objects that depend on those objects (see
+Section\ \&5.14)\&.
+.RE
+.PP
+RESTRICT
+.RS 4
+Refuse to drop the index if any objects depend on it\&. This is the default\&.
+.RE
+.SH "EXAMPLES"
+.PP
+This command will remove the index
+title_idx:
+.sp
+.if n \{\
+.RS 4
+.\}
+.nf
+DROP INDEX title_idx;
+.fi
+.if n \{\
+.RE
+.\}
+.SH "COMPATIBILITY"
+.PP
+\fBDROP INDEX\fR
+is a
+PostgreSQL
+language extension\&. There are no provisions for indexes in the SQL standard\&.
+.SH "SEE ALSO"
+CREATE INDEX (\fBCREATE_INDEX\fR(7))