Question

What is the Z07A record? What are z07_level and z07a_level?

Answer

In Aleph 17 and up, a z07a record is written whenever a z07 indexing doc record is processed by the ue_01_a routine.

This z07a record results in additional processing, by:

the ue_01_z0102_index indexing daemon
the ue_01_word_index (Aleph 18/ Aleph 19) or the ue_01_word_parallel (Aleph 20)

Both processes are started at the same time as the ue_01_a process (by the $aleph_proc/util_e_01 procedure).

Prior to Aleph 17, the z07_level indicated what processing had been done on the z07. This function is now switched to the z07a_level. (See below.)
In version Aleph 17 and up, the z07_level can have two values: "1" not processed or "2" processed (unsuccessfully ... and, therefore, not deleted).

z07_level = 2 indicates that ue_01 has had a problem processing this particular z07. Almost certainly some index has not been updated.

The z07a_level (the first byte of the z07a_rec_key) indicates what stage a particular z07a is at:

("1") not processed by either or unsuccessfully processed by ue_01_word_parallel
("2") successfully processed by ue_01_word_parallel
("3") unsuccessfully processed by ue_01_z0102
("4") successfully processed by ue_01_z0102

Example for "1"
Z07A_REC_KEY
-------------------------
1201302121414148000026541

The ue_01_word_parallel is an off-loading of the Word indexing to a separate process, so it can occur faster, in parallel, to the ue_01_a process.

Once a z07a is successfully processed by both procedures, it is deleted.

Category: Background processing (500)

Subject: Ue (500)

• Article last edited: 10/8/2013