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Move WAL constants to postgres/interface header.

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This commit is contained in:
Cynthia Shang
2020-09-08 12:44:08 -04:00
committed by David Steele
parent b8efb13bcb
commit fead004691
2 changed files with 14 additions and 14 deletions
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14
src/postgres/interface.c
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@@ -42,14 +42,6 @@ STRING_STATIC(PG_PATH_PGXACT_STR, "pg_xact");
STRING_STATIC(PG_NAME_LSN_STR, "lsn"); STRING_STATIC(PG_NAME_LSN_STR, "lsn");
STRING_STATIC(PG_NAME_LOCATION_STR, "location"); STRING_STATIC(PG_NAME_LOCATION_STR, "location");
/***********************************************************************************************************************************
Define default wal segment size
Before PostgreSQL 11 WAL segment size could only be changed at compile time and is not known to be well-tested, so only the default
WAL segment size is supported for versions below 11.
***********************************************************************************************************************************/
#define PG_WAL_SEGMENT_SIZE_DEFAULT ((unsigned int)(16 * 1024 * 1024))
/*********************************************************************************************************************************** /***********************************************************************************************************************************
Control file size. The control file is actually 8192 bytes but only the first 512 bytes are used to prevent torn pages even on Control file size. The control file is actually 8192 bytes but only the first 512 bytes are used to prevent torn pages even on
really old storage with 512-byte sectors. This is true across all versions of PostgreSQL. really old storage with 512-byte sectors. This is true across all versions of PostgreSQL.
@@ -57,12 +49,6 @@ really old storage with 512-byte sectors. This is true across all versions of P
#define PG_CONTROL_SIZE ((unsigned int)(8 * 1024)) #define PG_CONTROL_SIZE ((unsigned int)(8 * 1024))
#define PG_CONTROL_DATA_SIZE ((unsigned int)(512)) #define PG_CONTROL_DATA_SIZE ((unsigned int)(512))
/***********************************************************************************************************************************
WAL header size. It doesn't seem worth tracking the exact size of the WAL header across versions of PostgreSQL so just set it to
something far larger needed but <= the minimum read size on just about any system.
***********************************************************************************************************************************/
#define PG_WAL_HEADER_SIZE ((unsigned int)(512))
/*********************************************************************************************************************************** /***********************************************************************************************************************************
Name of default PostgreSQL database used for running all queries and commands Name of default PostgreSQL database used for running all queries and commands
***********************************************************************************************************************************/ ***********************************************************************************************************************************/

14
src/postgres/interface.h
View File

@@ -86,6 +86,20 @@ Segment size can only be changed at compile time and is not known to be well-tes
#define PG_SEGMENT_SIZE_DEFAULT ((unsigned int)(1 * 1024 * 1024 * 1024)) #define PG_SEGMENT_SIZE_DEFAULT ((unsigned int)(1 * 1024 * 1024 * 1024))
#define PG_SEGMENT_PAGE_DEFAULT (PG_SEGMENT_SIZE_DEFAULT / PG_PAGE_SIZE_DEFAULT) #define PG_SEGMENT_PAGE_DEFAULT (PG_SEGMENT_SIZE_DEFAULT / PG_PAGE_SIZE_DEFAULT)
/***********************************************************************************************************************************
WAL header size. It doesn't seem worth tracking the exact size of the WAL header across versions of PostgreSQL so just set it to
something far larger needed but <= the minimum read size on just about any system.
***********************************************************************************************************************************/
#define PG_WAL_HEADER_SIZE ((unsigned int)(512))
/***********************************************************************************************************************************
Define default wal segment size
Before PostgreSQL 11 WAL segment size could only be changed at compile time and is not known to be well-tested, so only the default
WAL segment size is supported for versions below 11.
***********************************************************************************************************************************/
#define PG_WAL_SEGMENT_SIZE_DEFAULT ((unsigned int)(16 * 1024 * 1024))
/*********************************************************************************************************************************** /***********************************************************************************************************************************
PostgreSQL Control File Info PostgreSQL Control File Info
***********************************************************************************************************************************/ ***********************************************************************************************************************************/