Done for glibc (most Linux systems) albeit imperfectly. add versioning for libc collations, where possible. In recent releases we've made a few small improvements: it still uses potentially corrupted indexes even when it generates the warning, and users might not see the warning. REFRESH VERSION to clear the version mismatch warning it spits out whenever opening an index the versions are tracked in a way that doesn't actually force you to rebuild your indexes or even help you find out which ones need to be rebuilt, it just trusts that you've done so when you enter the DDL command ALTER COLLATION. you can't use ICU for the "default" collation yet, and that's what almost all users use almost all of the time. There are problems with the way that we model versions in releases 10, 11 and 12: ICU is an alternative provider of collations (and many other things) that is much more powerful than libc, and, crucially, it can report a version string that you can use to detect when its underlying ordering rules change. Peter Eisentraut worked on adding ICU support to PostgreSQL 10. This means that collations must be carefully versioned." "Over time, collation order will vary: there may be fixes needed as more information becomes available about languages there may be new government or industry standards for the language that require changes and finally, new characters added to the Unicode Standard will interleave with the previously-defined ones. To quote from Unicode Technical Standard: there have been many reports over the years. FreeBSD 10 => 11: Dump and reload your PostgreSQL database unless you like it broken. The dangers of streaming across versions of glibc: A cautionary tale. GNU libc 2.28, for example, will change the ordering of many strings for all locales, and in recent memory German and Hungarian had subtle changes on Glibc that broke people's indexes. Some form of collating will be necessary for multiple page documents but if collating should be done while printing or in the inserting phase of the project depends on the size, type of information, and design of the piece.If the ordering of strings changes due to collation definition changes, a btree index (or more rarely, a check constraint or partition) can become corrupted. It is also best practice to add a sort number onto each page so an audit can be conducted to confirm that the pages have been collated correctly and are in the correct order. 
Typically when a piece has multiple pages with generic information, the piece is inserted one after the other, as the sequence does not matter, but when there is personalized information it is better to nest the pages to ensure that personal information is consistent. A printer can either print the pieces in the correct order or print each version separately and collate the pieces when inserting. In these cases the piece can either be inserted one after the other or can be nested behind each other. When a piece needs to be inserted into a regular #10 envelope collating will need to be done after the piece is folded when the pieces are being inserted. Once the files are printed they can be directly inserted into 9x12 envelopes stapled or binded and will remain in the correct order and grouping. We can also setup your variable data merge so that the file is in the correct format to be collated when printing.Ĭollating during the printing process works well for packets that will be stapled, binded, or inserted into a 9”x12” envelope. At Action Mail we can collate when printing (as long as the file has a FreeForm, PPML, Creo VPS, Xerorx VIPP, PDF/VT imposition or needs to be collated after a set number of pages) and can also collate after printing when inserting or assembling the piece. Pages can be collated based on a set number of pages (after every nth page) or after each record (when printing variable data). Collating is important when sending multiple page documents like open enrollment information, financial documents, statements, etc that have sensitive and personalized information on each page.
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