Miscellaneous Parameters
server_version
Parameter description: Specifies the server version number.
This parameter is an INTERNAL parameter. The value of this parameter cannot be modified.
Value range: a string
Default value: 9.2.4
server_version_num
Parameter description: Specifies the server version number.
This parameter is an INTERNAL parameter. The value of this parameter cannot be modified.
Value range: an integer
Default value: 90204
block_size
Parameter description: Specifies the block size of the current database.
This parameter is an INTERNAL parameter. The value of this parameter cannot be modified.
Value: 8192
Default value: 8192
segment_size
Parameter description: Specifies the segment file size of the current database.
This parameter is an INTERNAL parameter. The value of this parameter cannot be modified.
Unit: 8 KB
Default value: 131072, that is, 1 GB
max_index_keys
Parameter description: Specifies the maximum number of index keys supported by the current database.
This parameter is an INTERNAL parameter. The value of this parameter cannot be modified.
Default value: 32
integer_datetimes
Parameter description: Specifies whether the date and time are in the 64-bit integer format.
This parameter is an INTERNAL parameter. The value of this parameter cannot be modified.
Value range: Boolean
- on indicates that the 64-bit integer format is used.
- off indicates that the 64-bit integer format is not used.
Default value: on
lc_collate
Parameter description: Specifies the locale in which sorting of textual data is done.
This parameter is an INTERNAL parameter. The value of this parameter cannot be modified.
Default value: Determined by the configuration set during the openGauss installation and deployment.
lc_ctype
Parameter description: Specifies the locale that determines character classifications. For example, it specifies what a letter and its upper-case equivalent are.
This parameter is an INTERNAL parameter. The value of this parameter cannot be modified.
Default value: Determined by the configuration set during the openGauss installation and deployment.
max_identifier_length
Parameter description: Specifies the maximum identifier length.
This parameter is an INTERNAL parameter. The value of this parameter cannot be modified.
Value range: an integer
Default value: 63
server_encoding
Parameter description: Specifies the database encoding (character set).
By default, gs_initdb will initialize the setting of this parameter based on the current system environment. You can also run the locale command to check the current configuration environment.
This parameter is an INTERNAL parameter. The value of this parameter cannot be modified.
Default value: determined by the current system environment when the database is created.
enable_upgrade_merge_lock_mode
Parameter description: If this parameter is set to on, the delta merge operation internally increases the lock level, and errors can be prevented when update and delete operations are performed at the same time.
This parameter is a USERSET parameter. Set it based on instructions provided in Table 1.
Value range: Boolean
- If this parameter is set to on, the delta merge operation internally increases the lock level. In this way, when the DELTAMERGE operation is concurrently performed with the UPDATE or DELETE operation, one operation can be performed only after the previous one is complete.
- If this parameter is set to off and the DELTAMERGE operation is concurrently performed with the UPDATE or DELETE operation to the data in a row in the delta table of the table, errors will be reported during the later operation, and the operation will stop.
Default value: off
transparent_encrypted_string
Parameter description: Specifies a sample string that is transparently encrypted. Its value is generated by encrypting TRANS_ENCRYPT_SAMPLE_STRING using a database secret key. The ciphertext is used to check whether the DEK obtained during secondary startup is correct. If it is incorrect, database nodes will not be started. This parameter is a POSTMASTER parameter. Set it based on instructions provided in Table 1. This parameter applies only to the DWS scenario in the current version.
Value range: a string. An empty string indicates that openGauss is a not encrypted.
Default value: empty
NOTE: Do not set this parameter manually. Otherwise, openGauss may become faulty.
transparent_encrypt_kms_url
Parameter description: Specifies the URL for obtaining the database secret key to be transparently encrypted. It must contain only the characters specified in RFC3986, and the maximum length is 2047 bytes. The format is kms://Protocol@KMS host name 1;KMS host name 2:KMS port number/kms, for example, kms://https@linux175:29800/. This parameter applies only to the DWS scenario in the current version.
This parameter is a POSTMASTER parameter. Set it based on instructions provided in Table 1.
Value range: a string
Default value: empty
transparent_encrypt_kms_region
Parameter description: Specifies the deployment region of openGauss. It must contain only the characters specified in RFC3986, and the maximum length is 2047 bytes. This parameter applies only to the DWS scenario in the current version.
This parameter is a POSTMASTER parameter. Set it based on instructions provided in Table 1.
Value range: a string
Default value: empty
basebackup_timeout
Parameter description: Specifies the timeout interval for a connection that has no read or write operations after a backup transfer is complete.
When the gs_basebackup tool is used for transmission and a high compression rate is specified, the transmission of the tablespace may time out (the client needs to compress the transmitted data).
Value range: an integer ranging from 0 to INT_MAX. The unit is s. 0 indicates that archiving timeout is disabled.
Default value: 600s
datanode_heartbeat_interval
Parameter description: Specifies the interval at which heartbeat messages are sent between heartbeat threads. You are advised to set this parameter to a value no more than wal_receiver_timeout/2.
This parameter is a SIGHUP parameter. Set it based on instructions provided in Table 1.
Value range: an integer ranging from 1000 to 60000. The unit is ms.
Default value: 1s