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64 lines
2 KiB
Text
64 lines
2 KiB
Text
@section @code{db_create}
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@setfilename tokudb
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@settitle db_create
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@c man title db_create tokudb
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@unnumberedsubsec Synopsis
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@c man begin SYNOPSIS
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@code{#include <db.h>}
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@code{int db_create(DB **}@var{dbp}@code{, DB_ENV *}@var{env}@code{, u_int32_t }@var{flags}@code{);}
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@c man end
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@unnumberedsubsec Description
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@c man begin DESCRIPTION
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@code{db_create} creates a @code{DB} handle, allocating memory and initializing its contents.
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After creating the handle, you open a database using @code{(*}@var{dbp}@code{)->open(...)}.
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To free the memory associated with the handle call @code{(*}@var{dbp}@code{)->close(...)}
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(or @code{->remove} or @code{->rename} or @code{->verify\}when those are ready).
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The handle contains a field called @code{app_private} which is declared
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as type @code{void*}. This field is provided for the use of the
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application and is not further used by TokuDB. One typical use of
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@code{app_private} is to pass information about the database to a
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user-defined sort-order function.
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@c man end
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@unnumberedsubsec Parameters
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@c man begin PARAMETERS
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@table @var
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@item dbp
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A pointer to a @code{DB} variable. The @code{db_create} function does something like @code{*}@var{dbp}@code{=malloc(...)}.
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@item env
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If @var{env}@code{==NULL} then the database is not part of an environment
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(hence it has no transactions, locking, or recovery).
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Otherwise the database is created within the specified environment,
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and inherits the properties of that environment. (For example if
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logging for recovery is enabled by the environment, then the database
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will have logging too.)
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@item flags
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The @var{flags} parameter must be set to 0.
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@end table
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@c man end
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@unnumberedsubsec Return Value
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@c man begin RETURNVALUE
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Returns zero on success. The following non-zero errors can be returned:
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@table @code
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@item EINVAL
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You passed invalid parameters to this operation.
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@end table
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@c man end
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@unnumberedsubsec Notes
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@c man begin NOTES
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TokuDB allows at most a few thousand databases per file.
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@c man end
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@include everyman.texi
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