Memory Table

This section describes the parameters in the memory table.

enable_codegen_mot

Parameter description: Specifies whether to enable the native LLVM Lite to perform simple queries. If native LLVM is not supported on the current platform, pseudo LLVM will be used.

This parameter is a POSTMASTER parameter. Set it based on instructions provided in Table 1 GUC parameters.

Value range: Boolean

Default value: true

force_pseudo_codegen_mot

Parameter description: Specifies whether to force pseudo LLVM Lite to perform simple queries, even if the current platform supports native LLVM.

This parameter is a POSTMASTER parameter. Set it based on instructions provided in Table 1 GUC parameters.

Value range: Boolean

Default value: true

NOTE: Even if force_pseudo_codegen_mot is set to false, force_pseudo_codegen_mot is set to true. However, the current platform does not support the native LLVM. In this case, the pseudo LLVM is still used.

enable_codegen_mot_print

Parameter description: Specifies whether to print the IR byte code of the generation function. (If pseudo LLVM is used, the pseudo IR byte code is printed.)

This parameter is a POSTMASTER parameter. Set it based on instructions provided in Table 1 GUC parameters.

Value range: Boolean

Default value: true

codegen_mot_limit

Parameter description: Specifies the maximum number of global cache plan sources and the clone plan of each session.

This parameter is a POSTMASTER parameter. Set it based on instructions provided in Table 1 GUC parameters.

Value range: uint32

Default value: 100

mot_allow_index_on_nullable_column

Parameter description: Specifies whether indexes can be created on the nullable column in the memory table.

This parameter is a POSTMASTER parameter. Set it based on instructions provided in Table 1 GUC parameters.

Value range: Boolean

Default value: true

mot_config_file

Parameter description: Specifies the main configuration file of the MOT.

This parameter is a POSTMASTER parameter. Set it based on instructions provided in Table 1 GUC parameters.

Value range: a string

Default value: NULL