pg_memorycontext
插件提供了postgresql的内存上下文直方图。
The extension is compatible with PostgreSQL 9.2+.
Overview
插件安装后，在数据库中创建一个视图，视图含义： | 列名 | 含义 | | ——— |——| | totalsize | the total size(byte) of the context | | count | 内存上下文树中该context出现的次数 |
For example:
postgres=# select * from pg_memorycontext;
memorycontextname | count | totalsize(byte)
-----------------------------------------+-------+-----------
CacheMemoryContext | 1 | 516096
Timezones | 1 | 104120
TopMemoryContext | 1 | 95880
MessageContext | 1 | 65536
WAL record construction | 1 | 49768
TupleSort main | 1 | 32824
TransactionAbortContext | 1 | 32768
Relcache by OID | 1 | 24576
ExecutorState | 1 | 24576
smgr relation table | 1 | 24576
pg_memorycontext hash table | 1 | 24576
Record information cache | 1 | 24576
CFuncHash | 1 | 8192
PrivateRefCount | 1 | 8192
TopTransactionContext | 1 | 8192
ErrorContext | 1 | 8192
Portal hash | 1 | 8192
PortalMemory | 1 | 8192
Operator class cache | 1 | 8192
LOCALLOCK hash | 1 | 8192
MdSmgr
Installation guide
To install pg_memorycontext, execute in the module’s directory:
make install USE_PGXS=1
Modify the shared_preload_libraries parameter in postgresql.conf as following:
shared_preload_libraries = 'pg_memorycontext'
It is essential to restart the PostgreSQL instance. After that, execute the following query in psql:
CREATE EXTENSION pg_memorycontext;
Feedback
Do not hesitate to post your issues, questions and new ideas at the issues page.
Authors
Jack Gao jackgo73@outlook.com Huawei, China