2015-03-23 18:47:52 +01:00
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/*-------------------------------------------------------------------------
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*
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* pg_rewind.h
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*
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*
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2021-01-02 19:06:25 +01:00
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* Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
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2015-03-23 18:47:52 +01:00
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef PG_REWIND_H
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#define PG_REWIND_H
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#include "access/timeline.h"
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2019-09-30 17:57:35 +02:00
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#include "common/logging.h"
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2019-11-25 03:38:57 +01:00
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#include "datapagemap.h"
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2019-09-30 17:57:35 +02:00
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#include "libpq-fe.h"
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2015-03-23 18:47:52 +01:00
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#include "storage/block.h"
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#include "storage/relfilenode.h"
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/* Configuration options */
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extern char *datadir_target;
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extern bool showprogress;
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extern bool dry_run;
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2020-11-04 09:38:39 +01:00
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extern bool do_sync;
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Make WAL segment size configurable at initdb time.
For performance reasons a larger segment size than the default 16MB
can be useful. A larger segment size has two main benefits: Firstly,
in setups using archiving, it makes it easier to write scripts that
can keep up with higher amounts of WAL, secondly, the WAL has to be
written and synced to disk less frequently.
But at the same time large segment size are disadvantageous for
smaller databases. So far the segment size had to be configured at
compile time, often making it unrealistic to choose one fitting to a
particularly load. Therefore change it to a initdb time setting.
This includes a breaking changes to the xlogreader.h API, which now
requires the current segment size to be configured. For that and
similar reasons a number of binaries had to be taught how to recognize
the current segment size.
Author: Beena Emerson, editorialized by Andres Freund
Reviewed-By: Andres Freund, David Steele, Kuntal Ghosh, Michael
Paquier, Peter Eisentraut, Robert Hass, Tushar Ahuja
Discussion: https://postgr.es/m/CAOG9ApEAcQ--1ieKbhFzXSQPw_YLmepaa4hNdnY5+ZULpt81Mw@mail.gmail.com
2017-09-20 07:03:48 +02:00
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extern int WalSegSz;
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2015-03-23 18:47:52 +01:00
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2015-12-01 16:56:44 +01:00
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/* Target history */
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extern TimeLineHistoryEntry *targetHistory;
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extern int targetNentries;
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2019-05-14 19:11:23 +02:00
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/* Progress counters */
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extern uint64 fetch_size;
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extern uint64 fetch_done;
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/* logging support */
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#define pg_fatal(...) do { pg_log_fatal(__VA_ARGS__); exit(1); } while(0)
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2015-03-23 18:47:52 +01:00
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/* in parsexlog.c */
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extern void extractPageMap(const char *datadir, XLogRecPtr startpoint,
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2020-04-01 03:57:03 +02:00
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int tliIndex, XLogRecPtr endpoint,
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const char *restoreCommand);
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2015-03-23 18:47:52 +01:00
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extern void findLastCheckpoint(const char *datadir, XLogRecPtr searchptr,
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2015-12-01 16:56:44 +01:00
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int tliIndex,
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2015-03-23 18:47:52 +01:00
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XLogRecPtr *lastchkptrec, TimeLineID *lastchkpttli,
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2020-04-01 03:57:03 +02:00
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XLogRecPtr *lastchkptredo,
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const char *restoreCommand);
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2015-03-23 18:47:52 +01:00
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extern XLogRecPtr readOneRecord(const char *datadir, XLogRecPtr ptr,
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2020-04-22 01:08:28 +02:00
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int tliIndex, const char *restoreCommand);
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2015-03-23 18:47:52 +01:00
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2019-05-14 19:11:23 +02:00
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/* in pg_rewind.c */
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2020-08-17 08:27:29 +02:00
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extern void progress_report(bool finished);
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2019-05-14 19:11:23 +02:00
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2015-03-23 18:47:52 +01:00
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/* in timeline.c */
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extern TimeLineHistoryEntry *rewind_parseTimeLineHistory(char *buffer,
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2019-09-30 17:57:35 +02:00
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TimeLineID targetTLI,
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int *nentries);
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2015-03-23 18:47:52 +01:00
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#endif /* PG_REWIND_H */
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