database/postgres
1
0
Fork 0
mirror of https://github.com/postgres/postgres.git synced 2025-07-05 07:21:24 +03:00
Code Activity
Files
05d4cbf9b6ba708858984b01ca0fc56d59d4ec7c
postgres/src/backend/utils/misc/pg_controldata.c
Robert Haas 05d4cbf9b6 Increase width of RelFileNumbers from 32 bits to 56 bits. 
RelFileNumbers are now assigned using a separate counter, instead of
being assigned from the OID counter. This counter never wraps around:
if all 2^56 possible RelFileNumbers are used, an internal error
occurs. As the cluster is limited to 2^64 total bytes of WAL, this
limitation should not cause a problem in practice.

If the counter were 64 bits wide rather than 56 bits wide, we would
need to increase the width of the BufferTag, which might adversely
impact buffer lookup performance. Also, this lets us use bigint for
pg_class.relfilenode and other places where these values are exposed
at the SQL level without worrying about overflow.

This should remove the need to keep "tombstone" files around until
the next checkpoint when relations are removed. We do that to keep
RelFileNumbers from being recycled, but now that won't happen
anyway. However, this patch doesn't actually change anything in
this area; it just makes it possible for a future patch to do so.

Dilip Kumar, based on an idea from Andres Freund, who also reviewed
some earlier versions of the patch. Further review and some
wordsmithing by me. Also reviewed at various points by Ashutosh
Sharma, Vignesh C, Amul Sul, Álvaro Herrera, and Tom Lane.

Discussion: http://postgr.es/m/CA+Tgmobp7+7kmi4gkq7Y+4AM9fTvL+O1oQ4-5gFTT+6Ng-dQ=g@mail.gmail.com
2022-09-27 13:25:21 -04:00

350 lines
11 KiB
C
Raw Blame History

/*-------------------------------------------------------------------------
*
* pg_controldata.c
*
* Routines to expose the contents of the control data file via
* a set of SQL functions.
*
* Portions Copyright (c) 1996-2022, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* src/backend/utils/misc/pg_controldata.c
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include "access/htup_details.h"
#include "access/transam.h"
#include "access/xlog.h"
#include "access/xlog_internal.h"
#include "catalog/pg_control.h"
#include "catalog/pg_type.h"
#include "common/controldata_utils.h"
#include "funcapi.h"
#include "miscadmin.h"
#include "utils/builtins.h"
#include "utils/pg_lsn.h"
#include "utils/timestamp.h"
Datum
pg_control_system(PG_FUNCTION_ARGS)
{
Datum values[4];
bool nulls[4];
TupleDesc tupdesc;
HeapTuple htup;
ControlFileData *ControlFile;
bool crc_ok;
/*
* Construct a tuple descriptor for the result row. This must match this
* function's pg_proc entry!
*/
tupdesc = CreateTemplateTupleDesc(4);
TupleDescInitEntry(tupdesc, (AttrNumber) 1, "pg_control_version",
INT4OID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 2, "catalog_version_no",
INT4OID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 3, "system_identifier",
INT8OID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 4, "pg_control_last_modified",
TIMESTAMPTZOID, -1, 0);
tupdesc = BlessTupleDesc(tupdesc);
/* read the control file */
ControlFile = get_controlfile(DataDir, &crc_ok);
if (!crc_ok)
ereport(ERROR,
(errmsg("calculated CRC checksum does not match value stored in file")));
values[0] = Int32GetDatum(ControlFile->pg_control_version);
nulls[0] = false;
values[1] = Int32GetDatum(ControlFile->catalog_version_no);
nulls[1] = false;
values[2] = Int64GetDatum(ControlFile->system_identifier);
nulls[2] = false;
values[3] = TimestampTzGetDatum(time_t_to_timestamptz(ControlFile->time));
nulls[3] = false;
htup = heap_form_tuple(tupdesc, values, nulls);
PG_RETURN_DATUM(HeapTupleGetDatum(htup));
}
Datum
pg_control_checkpoint(PG_FUNCTION_ARGS)
{
Datum values[19];
bool nulls[19];
TupleDesc tupdesc;
HeapTuple htup;
ControlFileData *ControlFile;
XLogSegNo segno;
char xlogfilename[MAXFNAMELEN];
bool crc_ok;
/*
* Construct a tuple descriptor for the result row. This must match this
* function's pg_proc entry!
*/
tupdesc = CreateTemplateTupleDesc(18);
TupleDescInitEntry(tupdesc, (AttrNumber) 1, "checkpoint_lsn",
PG_LSNOID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 2, "redo_lsn",
PG_LSNOID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 3, "redo_wal_file",
TEXTOID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 4, "timeline_id",
INT4OID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 5, "prev_timeline_id",
INT4OID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 6, "full_page_writes",
BOOLOID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 7, "next_xid",
TEXTOID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 8, "next_oid",
OIDOID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 9, "next_multixact_id",
XIDOID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 10, "next_multi_offset",
XIDOID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 11, "oldest_xid",
XIDOID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 12, "oldest_xid_dbid",
OIDOID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 13, "oldest_active_xid",
XIDOID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 14, "oldest_multi_xid",
XIDOID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 15, "oldest_multi_dbid",
OIDOID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 16, "oldest_commit_ts_xid",
XIDOID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 17, "newest_commit_ts_xid",
XIDOID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 18, "checkpoint_time",
TIMESTAMPTZOID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 19, "next_relfilenumber",
INT8OID, -1, 0);
tupdesc = BlessTupleDesc(tupdesc);
/* Read the control file. */
ControlFile = get_controlfile(DataDir, &crc_ok);
if (!crc_ok)
ereport(ERROR,
(errmsg("calculated CRC checksum does not match value stored in file")));
/*
* Calculate name of the WAL file containing the latest checkpoint's REDO
* start point.
*/
XLByteToSeg(ControlFile->checkPointCopy.redo, segno, wal_segment_size);
XLogFileName(xlogfilename, ControlFile->checkPointCopy.ThisTimeLineID,
segno, wal_segment_size);
/* Populate the values and null arrays */
values[0] = LSNGetDatum(ControlFile->checkPoint);
nulls[0] = false;
values[1] = LSNGetDatum(ControlFile->checkPointCopy.redo);
nulls[1] = false;
values[2] = CStringGetTextDatum(xlogfilename);
nulls[2] = false;
values[3] = Int32GetDatum(ControlFile->checkPointCopy.ThisTimeLineID);
nulls[3] = false;
values[4] = Int32GetDatum(ControlFile->checkPointCopy.PrevTimeLineID);
nulls[4] = false;
values[5] = BoolGetDatum(ControlFile->checkPointCopy.fullPageWrites);
nulls[5] = false;
values[6] = CStringGetTextDatum(psprintf("%u:%u",
EpochFromFullTransactionId(ControlFile->checkPointCopy.nextXid),
XidFromFullTransactionId(ControlFile->checkPointCopy.nextXid)));
nulls[6] = false;
values[7] = ObjectIdGetDatum(ControlFile->checkPointCopy.nextOid);
nulls[7] = false;
values[8] = TransactionIdGetDatum(ControlFile->checkPointCopy.nextMulti);
nulls[8] = false;
values[9] = TransactionIdGetDatum(ControlFile->checkPointCopy.nextMultiOffset);
nulls[9] = false;
values[10] = TransactionIdGetDatum(ControlFile->checkPointCopy.oldestXid);
nulls[10] = false;
values[11] = ObjectIdGetDatum(ControlFile->checkPointCopy.oldestXidDB);
nulls[11] = false;
values[12] = TransactionIdGetDatum(ControlFile->checkPointCopy.oldestActiveXid);
nulls[12] = false;
values[13] = TransactionIdGetDatum(ControlFile->checkPointCopy.oldestMulti);
nulls[13] = false;
values[14] = ObjectIdGetDatum(ControlFile->checkPointCopy.oldestMultiDB);
nulls[14] = false;
values[15] = TransactionIdGetDatum(ControlFile->checkPointCopy.oldestCommitTsXid);
nulls[15] = false;
values[16] = TransactionIdGetDatum(ControlFile->checkPointCopy.newestCommitTsXid);
nulls[16] = false;
values[17] = TimestampTzGetDatum(time_t_to_timestamptz(ControlFile->checkPointCopy.time));
nulls[17] = false;
values[18] = Int64GetDatum((int64) ControlFile->checkPointCopy.nextRelFileNumber);
nulls[18] = false;
htup = heap_form_tuple(tupdesc, values, nulls);
PG_RETURN_DATUM(HeapTupleGetDatum(htup));
}
Datum
pg_control_recovery(PG_FUNCTION_ARGS)
{
Datum values[5];
bool nulls[5];
TupleDesc tupdesc;
HeapTuple htup;
ControlFileData *ControlFile;
bool crc_ok;
/*
* Construct a tuple descriptor for the result row. This must match this
* function's pg_proc entry!
*/
tupdesc = CreateTemplateTupleDesc(5);
TupleDescInitEntry(tupdesc, (AttrNumber) 1, "min_recovery_end_lsn",
PG_LSNOID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 2, "min_recovery_end_timeline",
INT4OID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 3, "backup_start_lsn",
PG_LSNOID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 4, "backup_end_lsn",
PG_LSNOID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 5, "end_of_backup_record_required",
BOOLOID, -1, 0);
tupdesc = BlessTupleDesc(tupdesc);
/* read the control file */
ControlFile = get_controlfile(DataDir, &crc_ok);
if (!crc_ok)
ereport(ERROR,
(errmsg("calculated CRC checksum does not match value stored in file")));
values[0] = LSNGetDatum(ControlFile->minRecoveryPoint);
nulls[0] = false;
values[1] = Int32GetDatum(ControlFile->minRecoveryPointTLI);
nulls[1] = false;
values[2] = LSNGetDatum(ControlFile->backupStartPoint);
nulls[2] = false;
values[3] = LSNGetDatum(ControlFile->backupEndPoint);
nulls[3] = false;
values[4] = BoolGetDatum(ControlFile->backupEndRequired);
nulls[4] = false;
htup = heap_form_tuple(tupdesc, values, nulls);
PG_RETURN_DATUM(HeapTupleGetDatum(htup));
}
Datum
pg_control_init(PG_FUNCTION_ARGS)
{
Datum values[11];
bool nulls[11];
TupleDesc tupdesc;
HeapTuple htup;
ControlFileData *ControlFile;
bool crc_ok;
/*
* Construct a tuple descriptor for the result row. This must match this
* function's pg_proc entry!
*/
tupdesc = CreateTemplateTupleDesc(11);
TupleDescInitEntry(tupdesc, (AttrNumber) 1, "max_data_alignment",
INT4OID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 2, "database_block_size",
INT4OID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 3, "blocks_per_segment",
INT4OID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 4, "wal_block_size",
INT4OID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 5, "bytes_per_wal_segment",
INT4OID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 6, "max_identifier_length",
INT4OID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 7, "max_index_columns",
INT4OID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 8, "max_toast_chunk_size",
INT4OID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 9, "large_object_chunk_size",
INT4OID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 10, "float8_pass_by_value",
BOOLOID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 11, "data_page_checksum_version",
INT4OID, -1, 0);
tupdesc = BlessTupleDesc(tupdesc);
/* read the control file */
ControlFile = get_controlfile(DataDir, &crc_ok);
if (!crc_ok)
ereport(ERROR,
(errmsg("calculated CRC checksum does not match value stored in file")));
values[0] = Int32GetDatum(ControlFile->maxAlign);
nulls[0] = false;
values[1] = Int32GetDatum(ControlFile->blcksz);
nulls[1] = false;
values[2] = Int32GetDatum(ControlFile->relseg_size);
nulls[2] = false;
values[3] = Int32GetDatum(ControlFile->xlog_blcksz);
nulls[3] = false;
values[4] = Int32GetDatum(ControlFile->xlog_seg_size);
nulls[4] = false;
values[5] = Int32GetDatum(ControlFile->nameDataLen);
nulls[5] = false;
values[6] = Int32GetDatum(ControlFile->indexMaxKeys);
nulls[6] = false;
values[7] = Int32GetDatum(ControlFile->toast_max_chunk_size);
nulls[7] = false;
values[8] = Int32GetDatum(ControlFile->loblksize);
nulls[8] = false;
values[9] = BoolGetDatum(ControlFile->float8ByVal);
nulls[9] = false;
values[10] = Int32GetDatum(ControlFile->data_checksum_version);
nulls[10] = false;
htup = heap_form_tuple(tupdesc, values, nulls);
PG_RETURN_DATUM(HeapTupleGetDatum(htup));
}
View Git Blame Copy Permalink