Help Center/ GaussDB(DWS)/ SQL Syntax Reference/ SQL Syntax Reference (8.3.0.x)/ Functions and Operators/ Residual File Management Functions/ Functions for Verifying Residual Files
Updated on 2024-09-03 GMT+08:00
View PDF
Share

Functions for Verifying Residual Files

pg_verify_residualfiles(filepath)

Description: Verifies whether the file recorded in the parameter specified file is a residual file. This function is an instance-level function and is related to the current database. It can run on any instance.

Parameter type: text

Return type: bool

The following table describes return columns.

Table 1 pg_verify_residualfiles (filepath) return fields

Column

Type

Description

isverified

bool

Verification completed or not

Example:

1
2
3
4
5
 
postgres=#SELECT * FROM pg_verify_residualfiles('pgrf_20200908160211441546');
 isverified 
------------
 t
(1 row)

This function only verifies whether the recorded file is a residual file in the current database. If the recorded file is not in the current database, the verification is not applicable.

pg_verify_residualfiles()

Description: Verifies whether recorded files on all residual file lists of the current instance are residual files. This function is an instance-level function and is related to the current database. It can run on any instance.

Parameter type: none

Return type: record

The following table describes return columns.

Table 2 pg_verify_residualfiles () return fields

Column

Type

Description

result

bool

Verification completed or not

filepath

text

Residual file path

notes

text

Notes

Example:

1
2
3
4
5
 
postgres=#SELECT * FROM pg_verify_residualfiles();
 result |         filepath          | notes 
--------+---------------------------+-------
 t      | pgrf_20200908160211441546 | 
(1 row)

This function only verifies whether the recorded file is a residual file in the current database. If the recorded file is not in the current database, the verification is not applicable.

pgxc_verify_residualfiles()

Description: Unified CN query function of pg_verify_residualfiles() This function is a cluster-level function and is related to the current database. It runs on CNs.

Parameter type: none

Return type: record

The following table describes return columns.

Table 3 pgxc_verify_residualfiles () return fields

Column

Type

Description

nodename

text

Node name

result

bool

Verification completed or not

filepath

text

Residual file path

notes

text

Notes

Example:

1
2
3
4
5
6
 
postgres=#SELECT * FROM pgxc_verify_residualfiles();
   nodename   | result |         filepath          | notes 
--------------+--------+---------------------------+-------
 cn_5001      | t      | pgrf_20200910170129360401 | 
 dn_6001_6002 | t      | pgrf_20200908160211441546 | 
(2 rows)

This function only verifies whether the recorded file is a residual file in the current database. If the recorded file is not in the current database, the verification is not applicable.

pg_is_residualfiles(residualfile)

Description: Queries whether a specified relfilenode is a residual file in the current database. This function is an instance-level function and is related to the current database. It can run on any instance.

Parameter type: text

Return type: bool

The following table describes return columns.

Table 4 pg_is_residualfiles (residualfile) return fields

Column

Type

Description

result

bool

Residual file or not

Example:

1
2
3
4
5
 
postgres=#SELECT * FROM pg_is_residualfiles('base/49155/114691');
 result 
--------
 t
(1 row)

This function only verifies whether the recorded file is a residual file in the current database. If the recorded file is not in the current database, it is verified as a residual file.

For example, the file base/15092/14790 is not regarded as a residual file in a gaussdb database, but it is regarded as a residual file in other databases.

postgres=#SELECT * FROM pg_is_residualfiles('base/15092/14790');
result
--------
f
(1 row)

postgres=#\c db2
db2=# SELECT * FROM pg_is_residualfiles('base/15092/14790');
result
--------
t
(1 row)