The Following is the TCB index that I could get using a command for my DB2 database. I don't know how to analyze it. Which columns are important? What do they mean?
TCB Index Stats:
Address TableName IID EmpPgDel RootSplits BndrySplts PseuEmptPg Scans KeyUpdates InclUpdats NonBndSpts PgAllocs Merges PseuDels DelClean IntNodSpl
0x07000000EA695040 TAB1 21 2128 0 5 2143 191 1738530 0 7916 6016 0 1805985 1743606 26
0x07000000EA695040 TAB1 20 357 0 2332 357 1242710 1738530 0 2584 4054 0 1812241 1652843 15
0x07000000EA695040 TAB1 19 662 1 4293 662 16464 1907107 0 4907 7537 0 2004994 1556457 46
0x07000000EA695040 TAB1 18 184 0 1689 184 2788625 1738530 0 1044 2235 0 1811998 1709486 6
0x07000000EA695040 TAB1 17 4705 1 0 4990 1210257 2017860 0 14890 11525 0 2119054 2067832 71
0x07000000EA695040 TAB1 16 5754 0 422 5923 116 1878324 0 15534 12105 0 1979092 1815142 95
0x07000000EA695040 TAB1 15 309 0 0 309 59269 1738530 0 5403 4419 0 1809592 1667684 13
0x07000000EA695040 TAB1 14 1 0 0 1 1964 38286 0 640 556 0 139952 121125 0
0x07000000EA695040 TAB1 13 0 1 0 0 1025 85 0 599 540 0 16995 15319 1
0x07000000EA695040 TAB1 12 55 0 549 55 3333550 85 0 404 787 0 103223 102424 0
0x07000000EA695040 TAB1 11 0 1 0 0 0 85 0 667 583 0 92226 87623 1
0x07000000EA695040 TAB1 10 0 0 0 0 2311 85 0 664 582 0 102572 88222 0
0x07000000EA695040 TAB1 9 2119 0 0 2530 92242 1738530 0 7482 5870 0 1810986 1764093 19
0x07000000EA695040 TAB1 8 42 0 0 46 5140 1401046 0 679 538 0 1468321 1457986 0
0x07000000EA695040 TAB1 7 770 0 514 959 1040 1738530 0 3460 3294 0 1809636 1758940 10
0x07000000EA695040 TAB1 6 71 0 0 71 208155 105241 0 1716 1488 0 205678 183839 3
0x07000000EA695040 TAB1 5 881 0 5 1094 459 1738530 0 4426 3622 0 1809593 1766681 11
0x07000000EA695040 TAB1 4 176 0 1837 172 2104 3016234 0 1068 2111 0 3119296 1655094 2
0x07000000EA695040 TAB1 3 2056 0 0 2539 945246 1738530 0 7459 5829 0 1810990 1778688 20
0x07000000EA695040 TAB1 2 14 0 0 14 1956 827370 0 767 606 0 914780 715791 0
0x07000000EA695040 TAB1 1 42 0 1120 42 14577342 0 0 640 1436 0 103138 100282 2
0x07000000E97B80C0 TAB2 22 53 0 804 52 101027 0 0 0 770 0 36098 34766 1
0x07000000E97B80C0 TAB2 21 0 0 310 0 406873 175642 0 565 849 0 211482 147209 1
0x07000000E97B80C0 TAB2 20 176 0 0 172 7117 3463 0 4196 4033 0 38044 38154 36
0x07000000E97B80C0 TAB2 19 244 0 4418 238 2271510 0 2286113 0 4222 0 36098 36680 4
0x07000000E97B80C0 TAB2 18 431 0 4543 1152 1614 2286113 0 3338 7482 0 2321909 2262963 98
0x07000000E97B80C0 TAB2 17 46 0 697 46 121 0 0 0 669 0 36098 34754 1
0x07000000E97B80C0 TAB2 16 23 0 394 23 6600 0 0 0 378 0 36098 30821 0
0x07000000E97B80C0 TAB2 15 122 0 0 119 1497610 0 0 1729 1659 0 36098 35976 7
0x07000000E97B80C0 TAB2 14 0 0 293 0 103031 86453 0 109 388 0 122249 78577 0
0x07000000E97B80C0 TAB2 13 156 0 0 371 26611 2286113 0 3234 3103 0 2321909 2276441 13
0x07000000E97B80C0 TAB2 12 43 0 680 43 11827 0 0 0 653 0 36098 33917 1
0x07000000E97B80C0 TAB2 11 1 0 598 1 63852 86453 0 425 986 0 122289 85714 2
0x07000000E97B80C0 TAB2 10 62 0 918 61 18190 0 0 0 881 0 36098 36052 1
0x07000000E97B80C0 TAB2 9 32 0 518 32 209418 36098 0 0 496 0 72196 72112 0
0x07000000E97B80C0 TAB2 8 13 0 0 13 6383 3463 0 222 219 0 37922 33539 1
0x07000000E97B80C0 TAB2 7 43 0 670 43 23306 0 0 0 642 0 36098 34458 1
0x07000000E97B80C0 TAB2 6 31 0 518 31 181547 0 0 0 495 0 36098 36044 0
0x07000000E97B80C0 TAB2 5 32 0 519 32 209546 36098 0 0 498 0 72196 72143 0
0x07000000E97B80C0 TAB2 4 11 0 1384 9 7003 2286113 0 23 1332 0 2321909 1000172 1
0x07000000E97B80C0 TAB2 3 0 0 0 0 6328 0 0 211 208 0 18539 13686 0
0x07000000E97B80C0 TAB2 2 0 0 136 0 59348 175642 0 139 266 0 211426 157453 0
0x07000000E97B80C0 TAB2 1 31 0 483 31 8304809 0 0 0 462 0 36098 36008 0
Best Answer
The report that you ran (I'm assuming it is the -tcbstats option on the db2pd command) allows you to see what indexes are applied to a table (or tables).
In your case, you can see TAB1 and TAB2 listed. For those tables, the next column is the index id (not the name of the index). You have 21 indexes assigned to TAB1 right now. Probably the biggest thing you care about is the Scans column. That shows you how often an index is used. This is important for determining the usefulness of an index. And based on what is shown above, check out your line:
This shows that index ID 11 in TAB1 is scanned/used 0 times. This means that DB2 has never found a reason to use this index yet. This index is probably a good candidate for deletion, which will help with increasing performance.
To identify, which index is associated with this ID, run the following:
Add
TABSCHEMA = ' 'to yourwhereclause if you need to get more specific.See the following article on developerworks for more information on identifying unused indexes.
And here is a link to how db2pd works, what parameters you pass it, what they mean, and what the different columns of the output report mean.