All tables are stored in packed form in blocks of length 4096 bytes. student has 10,000 tuples, each 200 bytes long. it is hashed on stuid, the primary key, and has a secondary non-clustered index on lastname, with three levels. there are 8000 values for lastname, 2000 values for firstname, 25 values for major, and 150 values for credit. faculty has 800 tuples of length 100 bytes. it has an index on facid, the primary key, with two levels. there is a secondary non-clustered index on department, with one level. facname has 650 values, department has 25 values, and rank has 4 values. class has 2500 tuples with length of 100 bytes. it is hashed on classname, the primary key, and has no secondary indexes. facid has 700 values here, schedule has 35 values, and room has 350 values. enroll has 50,000 tuples with length of 100 bytes. it has a composite index on the primary key, {class number, stupid}, with four levels, and it has no other index. the attribute grade has 10 values.

1) find the read cost only (no writing costs) of class |x| enroll using nested loops with:
- class as the outside loop and buffer size of only two blocks
- enroll as the outside loop and buffers size of two blocks
- class as the outside loop and buffer size of 10 blocks
- enroll as the outside loop and buffer size of 10 blocks

Work with a monitor that’s calibrated and profiled. for critical image editing, calibration and profiling are essential. otherwise, the image you see on your monitor looks different on other monitors or when printed.plan to use adjustment layers to adjust the tonal range and color balance of your image. adjustment layers let you go back and make successive tonal adjustments without discarding or permanently modifying data from the image layer. keep in mind that using adjustment layers adds to the file size of the image and demands more ram from your computer. accessing the color and tonal commands in the adjustments panel automatically creates adjustment layers.if you don’t want to use adjustment layers, you can apply adjustments directly to an image layer. remember that some image information is discarded, when making a color or tonal adjustment directly to an image layer.for critical work and maximum preservation of image data, it’s best if the image you work with is 16 bits per channel (16‑bit image) rather than 8 bits per channel (8‑bit image). data is discarded when you make tonal and color adjustments. the loss of image information is more critical in an 8‑bit image than a 16‑bit image. generally, 16‑bit images have a larger file size than 8‑bit images.duplicate or make a copy of the image file. working on a copy of your image preserves the original in the event you want to use the image in its original state.remove any flaws such as dust spots, blemishes, and scratches from the image before making color and tonal adjustments.open the info or histogram panel in expanded view. as you evaluate and correct the image, both panels display invaluable feedback on your adjustments.you can make a selection or use a mask to confine your color and tonal adjustments to part of an image. another way to apply color and tonal adjustments selectively is to set up your document with image components on different layers. color and tonal adjustments are applied to only one layer at a time. only the image components on the targeted layer are affected.

False if not look it up online