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IDS Forum

Re: RE: RE: Informix 12.1 Blocking Checkpoints

Posted By: NATYURAL HORACIO
Date: Tuesday, 7 November 2017, at 5:47 a.m.

In Response To: RE: RE: Informix 12.1 Blocking Checkpoints (Link, David A)

Hi,

Here it is :

AUTO_CKPTS=On RTO_SERVER_RESTART=Off

Critical Sections Physical Log Logical Log

Clock Total Flush Block # Ckpt Wait Long # Dirty Dskflu Total Avg Total Avg
Interval Time Trigger LSN Time Time Time Waits Time Time Time Buffers /Sec Pages /Sec Pages /Sec
1027271 15:58:17 CKPTINTVL 1477179:0x7de2018 20.7 17.7 0.0 18 0.0 1.2 2.5 34765 1961 6889 22 19702 64
1027272 16:04:14 CKPTINTVL 1477180:0x28ca018 46.3 44.5 0.0 7 0.0 0.9 1.3 19817 445 6706 20 20341 61
1027273 16:08:48 CKPTINTVL 1477180:0x75242e0 4.4 3.6 0.0 6 0.0 0.3 0.7 14482 4069 7140 22 19877 63
1027274 16:13:53 CKPTINTVL 1477180:0xc44d018 5.8 5.0 0.0 7 0.0 0.4 0.5 16719 3321 7465 24 20571 67
1027275 16:19:38 CKPTINTVL 1477181:0x3392018 45.1 43.1 0.0 10 0.0 0.9 1.8 14921 346 7782 25 25211 82
1027276 16:24:36 CKPTINTVL 1477181:0xa661468 28.9 27.4 0.0 15 0.0 0.6 1.3 17436 636 8603 27 31287 99
1027277 16:29:40 CKPTINTVL 1477182:0xc4e018 4.3 3.5 0.0 2 0.0 0.4 0.5 14007 4055 7643 23 20696 63
1027278 16:36:22 CKPTINTVL 1477182:0x7f72018 103.0 102.6 0.0 0 0.0 0.0 0.0 17725 172 9144 30 36297 119
1027279 16:39:58 CKPTINTVL 1477182:0xd44a018 5.2 4.4 0.0 2 0.0 0.3 0.5 17563 4028 8092 25 22107 70
1027280 16:45:01 CKPTINTVL 1477183:0xa39b018 3.6 3.1 0.0 3 0.0 0.2 0.3 25191 8089 11422 37 47722 156
1027281 16:50:17 CKPTINTVL 1477184:0x69d0cc 16.9 14.4 0.0 13 0.1 1.1 2.2 13874 964 7435 24 21666 71
1027282 16:55:48 CKPTINTVL 1477184:0x748b018 31.1 30.0 0.0 13 0.0 0.7 1.0 21411 714 8747 27 29988 95
1027283 17:02:04 CKPTINTVL 1477185:0x9f278 96.8 95.4 0.0 8 0.0 0.5 1.0 17254 180 9177 29 30386 97
1027284 17:06:58 CKPTINTVL 1477185:0x6016018 74.9 72.8 0.0 14 0.0 1.0 1.5 16851 231 9194 29 29269 92
1027285 17:11:24 CKPTINTVL 1477185:0xe90f524 26.9 25.0 0.0 12 0.0 0.8 1.4 20564 822 10391 33 40336 128
1027286 17:18:23 CKPTINTVL 1477186:0x682f138 116.4 85.4 0.0 326 28.6 15.1 29.8 16459 192 8342 23 30949 86
1027287 17:22:29 CKPTINTVL 1477186:0x8f6e2a8 20.9 17.1 0.0 348 2.0 3.9 5.4 10849 635 5035 16 12260 39
1027288 17:27:52 CKPTINTVL 1477187:0x31d8184 19.4 17.6 0.0 24 0.2 0.9 1.8 27955 1587 13490 41 37744 117
1027289 17:33:12 CKPTINTVL 1477188:0x7f84018 12.8 12.4 0.0 16 0.2 0.4 0.4 27856 2252 19806 60 82764 253
1027290 17:39:07 CKPTINTVL 1477189:0x47801ec 55.3 16.5 0.0 247 35.1 22.2 37.4 23435 1417 12129 34 49628 142

Max Plog Max Llog Max Dskflush Avg Dskflush Avg Dirty Blocked
pages/sec pages/sec Time pages/sec pages/sec Time
2927 3850 103 2612 0 0

Based on the current workload, the physical log might be too small
to accommodate the time it takes to flush the buffer pool during
checkpoint processing. The server might block transactions during checkpoints.
If the server blocks transactions, increase the physical log size to
at least 807852 KB.

Thanks,
Carlo

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