图片来源：Systems Performance: Enterprise and the Cloud，中译本《性能之巅》， 作者Brendan Gregg 11 缓冲区Buffer Pool page … Buffer Pool Manager (Main Memory) Access Methods and other components dirty bit reference count 事务提交时，所修改的页面不需要强制刷回到持久存储中 ■ Steal / No-Steal Steal: 允许Buffer Pool里未提交事务所修改的脏页刷回到持久存储 No-steal: 不允许Buffer Pool里未提交事务所修改的脏页刷到持久存储中 缓冲区管理策略Buffer Management Policy 13 ■ Force策略的问题 对持久存储器进行频繁的随机写操作，性能下降。 No-Force / Steal 有更好的性能，但是怎么保证事务的原子性和持久 性？ ❏ No-Force: 事务提交，所修改的数据页没有刷回至持久存储，如果发生断电 或者系统崩溃。 ❏ Steal: Buffer Pool中未提交的事务所修改的脏页刷回到持久存储，如果发生 断电或者系统崩溃。 缓冲区管理策略 14 ■ No-Force → Redo Log 事务提交时，数据页不需要刷回持久存储，为了保证持久性，先把Redo

which could cause backends to fail with latch already owned by pid. N/A Resolves CVE-2023-5869: Buffer overrun from integer overflow in array modification. Query Processing 377088 Resolves an issue includes a new extension - pg_buffercache -- which provides a new view to obtain clusterwide shared buffer metrics: gp_buffercache. The PgBouncer distributed with Greenplum Database has been updated to version in a configuration file. 14848 Adds a flag to the gpcheckperf utility called buffer-size to help you customize the buffer size when running network bandwidth tests. 15402 Resolves a performance issue

in a configuration file. 14848 Adds a flag to the gpcheckperf utility called buffer-size to help you customize the buffer size when running network bandwidth tests. 15402 Resolves a performance issue supported 1024 of each type of quota. diskquota 2.2.1+ supports 128 * 1024 quota types. Resolves a buffer overflow issue that may be observed in large Greenplum clusters by increasing the number of objects supports 128 * 1024 quota types. VMware Greenplum 6 Documentation VMware, Inc. 153 Resolves a buffer overflow issue that may be observed in large Greenplum clusters by increasing the number of objects

information about MTU sizes for Greenplum Database.) The receiver must store the fragments in a buffer before it can reorganize and reassemble the message. The following sysctl.conf operating system large amounts of memory. Block size determines buffering in the storage layer. Greenplum maintains a buffer per partition, and per column in column-oriented tables. Tables with many partitions or columns the filename if compression is enabled for s3 writable tables (the default). You can configure the buffer size and the number of threads that segments use for uploading files. See About the s3 Protocol

block of relation `. Greenplum now better tolerates the failure of bad buffer flushing on a temporary table. 32667 Due to a hard-coded search path, Greenplum Database returned upgraded on Desktop and Gateway systems. Resolved Issues Server 32398 Fixes double freeing of a buffer during stream teardown that resulted in a PANIC. 32384 Resolves an issue where a CTE query that correctly. The problem occurred because the code did not handle the situation where the end of a buffer coincided with the end of the data (and therefore does not include an expected newline character)

upgraded on Desktop and Gateway systems. Resolved Issues Server 32398 Fixes double freeing of a buffer during stream teardown that resulted in a PANIC. 32384 Resolves an issue where a CTE query that correctly. The problem occurred because the code did not handle the situation where the end of a buffer coincided with the end of the data (and therefore does not include an expected newline character) CVE-2020-25695/ Multiple features escape “security restricted operation” sandbox CVE-2021-32027/Buffer overrun from integer overflow in array subscripting calculations 31736, 31727 When the log_lock_waits

upgraded on Desktop and Gateway systems. Resolved Issues Server 32398 : Fixes double freeing of a buffer during stream teardown that resulted in a PANIC. 32384 : Resolves an issue where a CTE query that correctly. The problem occurred because the code did not handle the situation where the end of a buffer coincided with the end of the data (and therefore does not include an expected newline character) CVE-2020-25695/ Multiple features escape "security restricted operation" sandbox CVE-2021-32027/Buffer overrun from integer overflow in array subscripting calculations 31736, 31727 When the log_lock_waits

correctly. The problem occurred because the code did not handle the situation where the end of a buffer coincided with the end of the data (and therefore does not include an expected newline character) CVE-2020-25695/ Multiple features escape “security restricted operation” sandbox CVE-2021-32027/Buffer overrun from integer overflow in array subscripting calculations 31736, 31727 When the log_lock_waits produced a HashAggregate plan. 31073 - Segment Mirroring Resolves an issue where the kernel Recv-Q buffer filled up on a Greenplum mirror segment instance when the mirror sent statistics to the statistics

CVE-2020-25695/ Multiple features escape “security restricted operation” sandbox CVE-2021-32027/Buffer overrun from integer overflow in array subscripting calculations 31736, 31727 : When the log_lock_waits Documentation VMware, Inc. 169 31073 - Segment Mirroring : Resolves an issue where the kernel Recv-Q buffer filled up on a Greenplum mirror segment instance when the mirror sent statistics to the statistics are created when there is not enough memory to fit all the mapper output, usually when 80% of the buffer space is occupied. Also, see Resource Management for best practices for managing query memory using

CVE-2020-25695/ Multiple features escape “security restricted operation” sandbox CVE-2021-32027/Buffer overrun from integer overflow in array subscripting calculations 31736, 31727 : When the log_lock_waits Documentation VMware, Inc. 177 31073 - Segment Mirroring : Resolves an issue where the kernel Recv-Q buffer filled up on a Greenplum mirror segment instance when the mirror sent statistics to the statistics are created when there is not enough memory to fit all the mapper output, usually when 80% of the buffer space is occupied. Also, see Resource Management for best practices for managing query memory using