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Logical decoding of TRUNCATE

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Add a new WAL record type for TRUNCATE, which is only used when
wal_level >= logical.  (For physical replication, TRUNCATE is already
replicated via SMGR records.)  Add new callback for logical decoding
output plugins to receive TRUNCATE actions.

Author: Simon Riggs <simon@2ndquadrant.com>
Author: Marco Nenciarini <marco.nenciarini@2ndquadrant.it>
Author: Peter Eisentraut <peter.eisentraut@2ndquadrant.com>
Reviewed-by: Petr Jelinek <petr.jelinek@2ndquadrant.com>
Reviewed-by: Andres Freund <andres@anarazel.de>
Reviewed-by: Alvaro Herrera <alvherre@alvh.no-ip.org>
This commit is contained in:
Peter Eisentraut
2018-04-07 11:17:56 -04:00
parent b508a56f2f
commit 5dfd1e5a66
15 changed files with 414 additions and 13 deletions
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23
src/include/access/heapam_xlog.h
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@ -32,7 +32,7 @@
#define XLOG_HEAP_INSERT 0x00
#define XLOG_HEAP_DELETE 0x10
#define XLOG_HEAP_UPDATE 0x20
/* 0x030 is free, was XLOG_HEAP_MOVE */
#define XLOG_HEAP_TRUNCATE 0x30
#define XLOG_HEAP_HOT_UPDATE 0x40
#define XLOG_HEAP_CONFIRM 0x50
#define XLOG_HEAP_LOCK 0x60
@ -109,6 +109,27 @@ typedef struct xl_heap_delete
#define SizeOfHeapDelete (offsetof(xl_heap_delete, flags) + sizeof(uint8))
/*
* xl_heap_delete flag values, 8 bits are available.
*/
#define XLH_TRUNCATE_CASCADE (1<<0)
#define XLH_TRUNCATE_RESTART_SEQS (1<<1)
/*
* For truncate we list all truncated relids in an array, followed by all
* sequence relids that need to be restarted, if any.
* All rels are always within the same database, so we just list dbid once.
*/
typedef struct xl_heap_truncate
{
Oid dbId;
uint32 nrelids;
uint8 flags;
Oid relids[FLEXIBLE_ARRAY_MEMBER];
} xl_heap_truncate;
#define SizeOfHeapTruncate (offsetof(xl_heap_truncate, relids))
/*
* We don't store the whole fixed part (HeapTupleHeaderData) of an inserted
* or updated tuple in WAL; we can save a few bytes by reconstructing the