WiredTiger cursors can be configured for bulk-load using the bulk configuration keyword to WT_SESSION::open_cursor.

Bulk-load is a "fast path" for quickly loading a large number of rows. Bulk-load may only be used on newly created objects, and an object being bulk-loaded is not accessible from other cursors.

Cursors configured for bulk-load only support the WT_CURSOR::insert and WT_CURSOR::close methods.

When bulk-loading row-store objects, keys must be loaded in sorted order.

When using the sort utility on a Linux or other POSIX-like system to pre-sort keys, the locale specified by the environment affects the sort order and may not match the default sort order used by WiredTiger. Set LC_ALL=C in the process' environment to configure the traditional sort order that uses native byte values.

When bulk-loading fixed-length column store objects, the bulk configuration string value bitmap allows chunks of a memory resident bitmap to be loaded directly into an object by passing a WT_ITEM to WT_CURSOR::set_value, where the size field indicates the number of records in the bitmap (as specified by the object's value_format configuration). Bulk-loaded bitmap values must end on a byte boundary relative to the bit count (except for the last set of values loaded).