Fix attnum mismatch in pg_statistic after drop column and database restore #90

whitehawk · 2024-06-28T08:12:52Z

Fix attnum mismatch in pg_statistic after drop column and database restore

Problem:
In case a column (or columns) was dropped from a table, after backup and restore
cycle, second backup may contain pg_statistic values with a type not matching
the data (for ex. "array_in('{"test"}', '"timestamp"'::regtype::oid, -1)").

Root cause:
Records from pg_statistic were backed up with their actual values, including
attnums for the columns. But during restore, all tables are restored from
scratch. So, if a column is dropped in the table before backup, after the
restore attnum values in the pg_attribute table differ from the attnum
values that were before the backup (if the dropped column is not the one with
the highest attnum). But the restored values of pg_statistic had old attnums.
So, pg_statistics was not consistent with pg_attribute, and one of the side
effects was that on next backup the type for pg_statistic value was taken from
other column (and some pg_statistic were just lost).

Fix:
On the restore phase the column name is used to obtain actual attnum value from
the restored catalog and this value is now used when restoring statistics. The
'AttNumber' field is removed from the AttributeStatistic struct to prevent
its future use.

whitehawk · 2024-06-28T09:08:06Z

NOTE: If one wonders about possible performance impact of the delta, here is some execution time measurement done. On a db with 2000 tables (with 120 columns each), the backup time with statistics is following:

with the fix:

real	1m7,734s
user	0m25,875s
sys	0m16,997s

without the fix:

real	1m0,412s
user	0m22,166s
sys	0m14,506s

which doesn't look dramatic.

The code for creation test tables is following:

CREATE OR REPLACE FUNCTION create_many_tables()
RETURNS VOID
AS $$
BEGIN

	for counter in 1..2000 loop
		EXECUTE FORMAT($fmt$DROP TABLE IF EXISTS test_table_%1$s;$fmt$,
			counter);
			
		EXECUTE FORMAT($fmt$CREATE TABLE test_table_%1$s 
			(
				field_block_A_1		int8,
				field_block_A_2		varchar,
				field_block_A_3		int8,
				field_block_A_4		int8,
				field_block_A_5		int8,
				field_block_A_6		varchar,
				field_block_A_7		timestamp,
				field_block_A_8		varchar,
				field_block_A_9		int8,
				field_block_A_10	numeric,
				field_block_A_11	int8,
				field_block_A_12	int4,
				field_block_A_13	numeric,
				field_block_A_14	int4,
				field_block_A_15	varchar,
				field_block_A_16	int4,
				field_block_A_17	int8,
				field_block_A_18	int4,
				field_block_A_19	varchar,
				field_block_A_20	int4,
				field_block_A_21	date,
				field_block_A_22	int4,
				field_block_A_23	int8,
				field_block_A_24	int4,
				field_block_A_25	varchar,
				field_block_A_26	int4,
				field_block_A_27	varchar,
				field_block_A_28	int4,
				field_block_A_29	numeric,
				field_block_A_30	int4,
				field_block_A_31	varchar,
				field_block_A_32	int4,
				field_block_A_33	varchar,
				field_block_A_34	int4,
				field_block_A_35	numeric,
				field_block_A_36	int4,
				field_block_A_37	varchar,
				field_block_A_38	int4,
				field_block_A_39	int4,
				field_block_A_40	int4,
				field_block_B_1		int8,
				field_block_B_2		varchar,
				field_block_B_3		int8,
				field_block_B_4		int8,
				field_block_B_5		int8,
				field_block_B_6		varchar,
				field_block_B_7		timestamp,
				field_block_B_8		varchar,
				field_block_B_9		int8,
				field_block_B_10	numeric,
				field_block_B_11	int8,
				field_block_B_12	int4,
				field_block_B_13	numeric,
				field_block_B_14	int4,
				field_block_B_15	varchar,
				field_block_B_16	int4,
				field_block_B_17	int8,
				field_block_B_18	int4,
				field_block_B_19	varchar,
				field_block_B_20	int4,
				field_block_B_21	date,
				field_block_B_22	int4,
				field_block_B_23	int8,
				field_block_B_24	int4,
				field_block_B_25	varchar,
				field_block_B_26	int4,
				field_block_B_27	varchar,
				field_block_B_28	int4,
				field_block_B_29	numeric,
				field_block_B_30	int4,
				field_block_B_31	varchar,
				field_block_B_32	int4,
				field_block_B_33	varchar,
				field_block_B_34	int4,
				field_block_B_35	numeric,
				field_block_B_36	int4,
				field_block_B_37	varchar,
				field_block_B_38	int4,
				field_block_B_39	int4,
				field_block_B_40	int4,
				field_block_C_1		int8,
				field_block_C_2		varchar,
				field_block_C_3		int8,
				field_block_C_4		int8,
				field_block_C_5		int8,
				field_block_C_6		varchar,
				field_block_C_7		timestamp,
				field_block_C_8		varchar,
				field_block_C_9		int8,
				field_block_C_10	numeric,
				field_block_C_11	int8,
				field_block_C_12	int4,
				field_block_C_13	numeric,
				field_block_C_14	int4,
				field_block_C_15	varchar,
				field_block_C_16	int4,
				field_block_C_17	int8,
				field_block_C_18	int4,
				field_block_C_19	varchar,
				field_block_C_20	int4,
				field_block_C_21	date,
				field_block_C_22	int4,
				field_block_C_23	int8,
				field_block_C_24	int4,
				field_block_C_25	varchar,
				field_block_C_26	int4,
				field_block_C_27	varchar,
				field_block_C_28	int4,
				field_block_C_29	numeric,
				field_block_C_30	int4,
				field_block_C_31	varchar,
				field_block_C_32	int4,
				field_block_C_33	varchar,
				field_block_C_34	int4,
				field_block_C_35	numeric,
				field_block_C_36	int4,
				field_block_C_37	varchar,
				field_block_C_38	int4,
				field_block_C_39	int4,
				field_block_C_40	int4
			) DISTRIBUTED BY (field_block_A_1);$fmt$,
			counter);
			
		EXECUTE FORMAT($fmt$INSERT INTO test_table_%1$s 
			VALUES
			(
			1, 'val_field_block_A_2', 3, 4, 5, 'val_field_block_A_6', '2021-01-01', 'val_field_block_A_8', 9, 10,
			11, 12, 13, 14, 'val_field_block_A_15', 16, 17, 18, 'val_field_block_A_19', 20, '2021-01-02', 22, 23,
			24, 'val_field_block_A_25', 26, 'val_field_block_A_27', 28, 29, 30, 'field_block_A_31', 32,
			'val_field_block_A_33', 34, 35, 36, 'val_field_block_A_37', 38, 39, 40,

			100, 'val_field_block_B_2', 103, 104, 105, 'val_field_block_B_6', '2021-02-01', 'val_field_block_B_8', 109, 110,
			111, 112, 113, 114, 'val_field_block_B_15', 116, 117, 118, 'val_field_block_B_19', 120, '2021-02-02', 122, 123,
			124, 'val_field_block_B_25', 126, 'val_field_block_B_27', 128, 129, 130, 'field_block_B_31', 132,
			'val_field_block_B_33', 134, 135, 136, 'val_field_block_B_37', 138, 139, 140,

			200, 'val_field_block_C_2', 203, 204, 205, 'val_field_block_C_6', '2021-03-01', 'val_field_block_C_8', 209, 210,
			211, 212, 213, 214, 'val_field_block_C_15', 216, 217, 218, 'val_field_block_C_19', 220, '2021-03-02', 222, 223,
			224, 'val_field_block_C_25', 226, 'val_field_block_C_27', 228, 229, 230, 'field_block_C_31', 232,
			'val_field_block_C_33', 234, 235, 236, 'val_field_block_C_37', 238, 239, 240
			),
			(
			1, 'val_field_block_A_2', 3, 4, 5, 'val_field_block_A_6', '2021-01-01', 'val_field_block_A_8', 9, 10,
			11, 12, 13, 14, 'val_field_block_A_15', 16, 17, 18, 'val_field_block_A_19', 20, '2021-01-02', 22, 23,
			24, 'val_field_block_A_25', 26, 'val_field_block_A_27', 28, 29, 30, 'field_block_A_31', 32,
			'val_field_block_A_33', 34, 35, 36, 'val_field_block_A_37', 38, 39, 40,

			100, 'val_field_block_B_2', 103, 104, 105, 'val_field_block_B_6', '2021-02-01', 'val_field_block_B_8', 109, 110,
			111, 112, 113, 114, 'val_field_block_B_15', 116, 117, 118, 'val_field_block_B_19', 120, '2021-02-02', 122, 123,
			124, 'val_field_block_B_25', 126, 'val_field_block_B_27', 128, 129, 130, 'field_block_B_31', 132,
			'val_field_block_B_33', 134, 135, 136, 'val_field_block_B_37', 138, 139, 140,

			200, 'val_field_block_C_2', 203, 204, 205, 'val_field_block_C_6', '2021-03-01', 'val_field_block_C_8', 209, 210,
			211, 212, 213, 214, 'val_field_block_C_15', 216, 217, 218, 'val_field_block_C_19', 220, '2021-03-02', 222, 223,
			224, 'val_field_block_C_25', 226, 'val_field_block_C_27', 228, 229, 230, 'field_block_C_31', 232,
			'val_field_block_C_33', 234, 235, 236, 'val_field_block_C_37', 238, 239, 240
			),
			(
			1, 'val_field_block_A_2', 3, 4, 5, 'val_field_block_A_6', '2021-01-01', 'val_field_block_A_8', 9, 10,
			11, 12, 13, 14, 'val_field_block_A_15', 16, 17, 18, 'val_field_block_A_19', 20, '2021-01-02', 22, 23,
			24, 'val_field_block_A_25', 26, 'val_field_block_A_27', 28, 29, 30, 'field_block_A_31', 32,
			'val_field_block_A_33', 34, 35, 36, 'val_field_block_A_37', 38, 39, 40,

			100, 'val_field_block_B_2', 103, 104, 105, 'val_field_block_B_6', '2021-02-01', 'val_field_block_B_8', 109, 110,
			111, 112, 113, 114, 'val_field_block_B_15', 116, 117, 118, 'val_field_block_B_19', 120, '2021-02-02', 122, 123,
			124, 'val_field_block_B_25', 126, 'val_field_block_B_27', 128, 129, 130, 'field_block_B_31', 132,
			'val_field_block_B_33', 134, 135, 136, 'val_field_block_B_37', 138, 139, 140,

			200, 'val_field_block_C_2', 203, 204, 205, 'val_field_block_C_6', '2021-03-01', 'val_field_block_C_8', 209, 210,
			211, 212, 213, 214, 'val_field_block_C_15', 216, 217, 218, 'val_field_block_C_19', 220, '2021-03-02', 222, 223,
			224, 'val_field_block_C_25', 226, 'val_field_block_C_27', 228, 229, 230, 'field_block_C_31', 232,
			'val_field_block_C_33', 234, 235, 236, 'val_field_block_C_37', 238, 239, 240
			)
			;$fmt$,
			counter);
	end loop;

END$$
LANGUAGE plpgsql VOLATILE
EXECUTE ON MASTER;

backup/queries_statistics.go

This reverts commit f665990.

This reverts commit 6488ee7.

backup/queries_statistics.go

restore/restore.go

backup/statistics.go

swork12 · 2024-08-05T05:42:20Z

bender build

backup/statistics.go

restore/restore.go

backup/statistics.go

restore/restore.go

RekGRpth · 2024-08-09T03:52:00Z

restore/restore.go

@@ -415,6 +415,10 @@ func editStatementsRedirectSchema(statements []toc.StatementWithType, redirectSc
 	permissionsRE := regexp.MustCompile(fmt.Sprintf(`(?m)(^(?:REVOKE|GRANT) .+ ON .+?) (%s)((\..+)? (?:FROM|TO) .+)`, schemaMatch))
 	// This expression matches an ATTACH PARTITION statement and captures both the parent and child schema names
 	attachRE := regexp.MustCompile(fmt.Sprintf(`(ALTER TABLE(?: ONLY)?) (%[1]s)(\..+ ATTACH PARTITION) (%[1]s)(\..+)`, schemaMatch))
+	// This expression matches a '<schema>.<table>'::regclass::oid expression
+	regclassOidRE := regexp.MustCompile(fmt.Sprintf(`'(%s)((\.[^']+)'\:\:regclass\:\:oid)`, schemaMatch))


this regex does not catch table name with single quote

create schema qwe; create schema rty; CREATE TABLE qwe."fo'o"(i int); INSERT INTO qwe."fo'o" VALUES (1), (2), (3);

gpbackup --backup-dir ~/gpbackup --debug --dbname gpadmin --with-stats --single-backup-dir --include-schema qwe

gprestore --timestamp 20240809084649 --debug --backup-dir ~/gpbackup --on-error-continue --redirect-db gpadmin --redirect-schema rty --include-schema qwe --with-stats 20240809:08:49:44 gprestore:gpadmin:gpdb6:060212-[DEBUG]:-Restore Command: [gprestore --timestamp 20240809084649 --debug --backup-dir /home/gpadmin/gpbackup --on-error-continue --redirect-db gpadmin --redirect-schema rty --include-schema qwe --with-stats] 20240809:08:49:44 gprestore:gpadmin:gpdb6:060212-[INFO]:-Restore Key = 20240809084649 20240809:08:49:44 gprestore:gpadmin:gpdb6:060212-[INFO]:-gpbackup version = 1.30.5_arenadata15+dev.17.g597f3e4b 20240809:08:49:44 gprestore:gpadmin:gpdb6:060212-[INFO]:-gprestore version = 1.30.5_arenadata15+dev.17.g597f3e4b 20240809:08:49:44 gprestore:gpadmin:gpdb6:060212-[INFO]:-Greenplum Database Version = 6.27.1_arenadata56+dev.36.g6ad72daf603 build dev 20240809:08:49:44 gprestore:gpadmin:gpdb6:060212-[DEBUG]:-Gathering information on backup directories 20240809:08:49:44 gprestore:gpadmin:gpdb6:060212-[DEBUG]:-Verifying backup directories exist 20240809:08:49:44 gprestore:gpadmin:gpdb6:060212-[DEBUG]:-Metadata will be restored from /home/gpadmin/gpbackup/backups/20240809/20240809084649/gpbackup_20240809084649_metadata.sql 20240809:08:49:44 gprestore:gpadmin:gpdb6:060212-[INFO]:-Restoring pre-data metadata 20240809:08:49:44 gprestore:gpadmin:gpdb6:060212-[DEBUG]:-Executing statement: CREATE FUNCTION rty.f() RETURNS void AS $$begin DELETE FROM pg_statistic WHERE false; end;$$ LANGUAGE plpgsql NO SQL; on connection: 0 20240809:08:49:44 gprestore:gpadmin:gpdb6:060212-[DEBUG]:-Pre-data objects restored: 10% (1/6) 20240809:08:49:44 gprestore:gpadmin:gpdb6:060212-[DEBUG]:-Executing statement: ALTER FUNCTION rty.f() OWNER TO gpadmin; on connection: 0 20240809:08:49:44 gprestore:gpadmin:gpdb6:060212-[DEBUG]:-Pre-data objects restored: 30% (2/6) 20240809:08:49:44 gprestore:gpadmin:gpdb6:060212-[DEBUG]:-Executing statement: CREATE TABLE rty."fo'o" ( i integer ) DISTRIBUTED BY (i); on connection: 0 20240809:08:49:44 gprestore:gpadmin:gpdb6:060212-[DEBUG]:-Pre-data objects restored: 50% (3/6) 20240809:08:49:44 gprestore:gpadmin:gpdb6:060212-[DEBUG]:-Executing statement: ALTER TABLE rty."fo'o" OWNER TO gpadmin; on connection: 0 20240809:08:49:44 gprestore:gpadmin:gpdb6:060212-[DEBUG]:-Pre-data objects restored: 60% (4/6) 20240809:08:49:44 gprestore:gpadmin:gpdb6:060212-[DEBUG]:-Executing statement: CREATE VIEW rty.my AS SELECT count(*) AS count FROM pg_statistic; on connection: 0 20240809:08:49:44 gprestore:gpadmin:gpdb6:060212-[DEBUG]:-Pre-data objects restored: 80% (5/6) 20240809:08:49:44 gprestore:gpadmin:gpdb6:060212-[DEBUG]:-Executing statement: ALTER VIEW rty.my OWNER TO gpadmin; on connection: 0 20240809:08:49:44 gprestore:gpadmin:gpdb6:060212-[DEBUG]:-Pre-data objects restored: 100% (6/6) 20240809:08:49:44 gprestore:gpadmin:gpdb6:060212-[INFO]:-Pre-data metadata restore complete 20240809:08:49:44 gprestore:gpadmin:gpdb6:060212-[DEBUG]:-Verifying backup file count 20240809:08:49:44 gprestore:gpadmin:gpdb6:060212-[DEBUG]:-Executing statement: SET client_encoding = 'UTF8'; on connection: 0 20240809:08:49:44 gprestore:gpadmin:gpdb6:060212-[DEBUG]:-Executing statement: SET client_encoding = 'UTF8'; on connection: 0 20240809:08:49:44 gprestore:gpadmin:gpdb6:060212-[DEBUG]:-Restoring data for 1 tables from backup with timestamp: 20240809084649 20240809:08:49:44 gprestore:gpadmin:gpdb6:060212-[DEBUG]:-Executing statement: SET client_encoding = 'UTF8'; on connection: 0 20240809:08:49:44 gprestore:gpadmin:gpdb6:060212-[DEBUG]:-Executing statement: SET client_encoding = 'UTF8'; on connection: 0 20240809:08:49:44 gprestore:gpadmin:gpdb6:060212-[DEBUG]:-Reading from /home/gpadmin/gpbackup/backups/20240809/20240809084649/gpbackup_<SEGID>_20240809084649_16387.gz 20240809:08:49:44 gprestore:gpadmin:gpdb6:060212-[DEBUG]:-Executing "COPY rty."fo'o"(i) FROM PROGRAM 'cat /home/gpadmin/gpbackup/backups/20240809/20240809084649/gpbackup_<SEGID>_20240809084649_16387.gz | gzip -d -c' WITH CSV DELIMITER ',' ON SEGMENT;" on master 20240809:08:49:44 gprestore:gpadmin:gpdb6:060212-[DEBUG]:-Restored data to table rty."fo'o" from file (table 1 of 1) 20240809:08:49:44 gprestore:gpadmin:gpdb6:060212-[INFO]:-Data restore complete 20240809:08:49:44 gprestore:gpadmin:gpdb6:060212-[INFO]:-Restoring post-data metadata 20240809:08:49:44 gprestore:gpadmin:gpdb6:060212-[INFO]:-Post-data metadata restore complete 20240809:08:49:44 gprestore:gpadmin:gpdb6:060212-[INFO]:-Restoring query planner statistics from /home/gpadmin/gpbackup/backups/20240809/20240809084649/gpbackup_20240809084649_statistics.sql 20240809:08:49:44 gprestore:gpadmin:gpdb6:060212-[DEBUG]:-Executing statement: UPDATE pg_class SET relpages = 2::int, reltuples = 3.000000::real WHERE oid = 'qwe."fo''o"'::regclass::oid; on connection: 0 20240809:08:49:44 gprestore:gpadmin:gpdb6:060212-[DEBUG]:-Executing statement: DELETE FROM pg_statistic WHERE (starelid, staattnum) IN (SELECT attrelid, attnum FROM pg_attribute WHERE attrelid = 'qwe."fo''o"'::regclass::oid AND attname = 'i'); on connection: 0 20240809:08:49:44 gprestore:gpadmin:gpdb6:060212-[DEBUG]:-Executing statement: INSERT INTO pg_statistic SELECT attrelid, attnum, false::boolean, 0.000000::real, 4::integer, -1.000000::real, 2::smallint, 3::smallint, 0::smallint, 0::smallint, 0::smallint, 97::oid, 97::oid, 0::oid, 0::oid, 0::oid, NULL::real[], '{"-0.5"}'::real[], NULL::real[], NULL::real[], NULL::real[], array_in('{"1","2","3"}', 'int4'::regtype::oid, -1), NULL, NULL, NULL, NULL FROM pg_attribute WHERE attrelid = 'qwe."fo''o"'::regclass::oid AND attname = 'i'; on connection: 0 20240809:08:49:44 gprestore:gpadmin:gpdb6:060212-[INFO]:-Query planner statistics restore complete 20240809:08:49:44 gprestore:gpadmin:gpdb6:060212-[INFO]:-Found neither /usr/local/bin/gp_email_contacts.yaml nor /home/gpadmin/gp_email_contacts.yaml 20240809:08:49:44 gprestore:gpadmin:gpdb6:060212-[INFO]:-Email containing gprestore report /home/gpadmin/gpbackup/backups/20240809/20240809084649/gprestore_20240809084649_20240809084944_report will not be sent 20240809:08:49:44 gprestore:gpadmin:gpdb6:060212-[INFO]:-Beginning cleanup 20240809:08:49:44 gprestore:gpadmin:gpdb6:060212-[INFO]:-Cleanup complete 20240809:08:49:44 gprestore:gpadmin:gpdb6:060212-[INFO]:-Restore completed successfully

restore/restore_internal_test.go

whitehawk added 2 commits June 28, 2024 17:32

Fix pg_statistic values if some columns were dropped

6488ee7

Add test

f665990

whitehawk changed the title ~~DRAFT Adbdev 5861~~ Fix attnum mismatch in pg_statistic after drop column and database restore Jun 28, 2024

whitehawk marked this pull request as ready for review June 28, 2024 11:24

Stolb27 reviewed Jun 28, 2024

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whitehawk added 7 commits July 23, 2024 08:19

Revert "Add test"

ac52329

This reverts commit f665990.

Revert "Fix pg_statistic values if some columns were dropped"

de745df

This reverts commit 6488ee7.

Fix attnum values at restore phase

469a082

Add test

ec392de

Fix column names with single quotes

71b524d

Improve test

c5c671d

Remove redundant alias in the query

12215a8

RekGRpth reviewed Jul 24, 2024

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red1452 previously approved these changes Jul 25, 2024

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Merge branch 'master' into ADBDEV-5861

db5968c

whitehawk dismissed red1452’s stale review via db5968c August 4, 2024 00:38

RekGRpth reviewed Aug 5, 2024

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whitehawk added 2 commits August 6, 2024 16:57

Improve schema replacement for statistics restore

55f45e1

Improve schema replacement for statistics restore a bit more

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RekGRpth reviewed Aug 7, 2024

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Improve statistics backup queries

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RekGRpth reviewed Aug 7, 2024

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Improve statistics queries

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RekGRpth reviewed Aug 8, 2024

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Fix schema replacement for statistics statements

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whitehawk added 2 commits August 9, 2024 09:09

Improved check to detect statistics statements

4dcab8c

Fix typo in comment

597f3e4

RekGRpth reviewed Aug 9, 2024

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Improve reg exp for schema detection

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red1452 reviewed Aug 13, 2024

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red1452 approved these changes Aug 14, 2024

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bimboterminator1 approved these changes Aug 15, 2024

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Merge branch 'master' into ADBDEV-5861

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Stolb27 enabled auto-merge (squash) August 16, 2024 06:48

Stolb27 merged commit 21ba1a1 into master Aug 17, 2024
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Stolb27 deleted the ADBDEV-5861 branch August 17, 2024 01:18

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Fix attnum mismatch in pg_statistic after drop column and database restore #90

Fix attnum mismatch in pg_statistic after drop column and database restore #90

whitehawk commented Jun 28, 2024 •

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whitehawk commented Jun 28, 2024

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swork12 commented Aug 5, 2024

RekGRpth Aug 9, 2024

whitehawk Aug 12, 2024

Fix attnum mismatch in pg_statistic after drop column and database restore #90

Fix attnum mismatch in pg_statistic after drop column and database restore #90

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whitehawk commented Jun 28, 2024 • edited Loading

whitehawk commented Jun 28, 2024

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swork12 commented Aug 5, 2024

RekGRpth Aug 9, 2024

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whitehawk Aug 12, 2024

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whitehawk commented Jun 28, 2024 •

edited

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