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, sherd
Zoology a tough sheath, scale, or shell, esp the elytra of a beetle
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005


A vitric fragment in pyroclastics, having a characteristically curved surface of fracture.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

database partitioning

Splitting large databases into separate entities for faster retrieval.

Horizontal Partitioning and Sharding
Horizontal partitioning separates rows by key fields; for example, all Arizona records are maintained in one index and New Mexico records in another, etc., or account numbers from 00001 to 49999 in one, and 50000 to 99999 in another.

If each horizontal partition is stored on a separate server, the partition is called a "shard," and the process is "sharding." Databases that provide automatic sharding determine how to divide the database into chunks based on ranges of values as in the above examples or by computing hash values of the keys. The latter creates a more uniform distribution of the data.

Vertical Partitioning
Also known as "row splitting," vertical partitioning separates columns. For example, widely used columns are stored in one database, while columns that are accessed infrequently are stored in another.

Master/Slave Partitioning
This simple method is used when viewing updates in real time is not critical. The master server is used for all updating of the database (writing), and one or more slave servers are used as copies for reading. Periodically, the updates on the master are copied to the slaves. See shared nothing.
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References in periodicals archive ?
In this case, it seems that petrographical method, the main aim of which is to define the mineral composition of various components in a ceramic sherd in a thin section (Kul'kova 2011, 164; 2012, 103), is less effective in defining the type of temper that has left no traces in pores.
Nevertheless, it is important to note that this pottery, at least in the Cunil and Eb spheres, does not represent a rudimentary technology as most sherds evince a high-firing "metallic" sound when dropped.
Another caveat is that some sherds may have been misclassified as undecorated when, in fact, they included a pattern that was not exhibited in the particular portion of the vessel that was recovered.
By identifying the mineralogical composition of pottery sherds it may be possible to deduce the geological origins of the mineral inclusions and to pinpoint the specific location of the source of the pottery materials (Rye 1976:107).
Sample 40WM01-3--This sherd was initially described as having a non-decorated outer surface tempered with large fragments of crushed shell.
The ceramics include dentate-stamped and finely incised Lapita sherds from a number of different vessels, along with numerous plain sherds.
In fact, the latter is early Samad LIA, mixed with a few EIA sherds.
The results of the lipid analysis from sherd 4245: 2039 are clearly indicative of degraded aquatic products (Table 2; Fig.
Borrinaga also disproved the theory that the Intramuros pot sherd unearthed at the San Ignacio Church ruins in 2008 had baybayin script inscribed on it.
Two years after this last document, Le Sherd is mentioned; however it was not until 1642 that Shardend is given.